Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Functional nanocomposites for advanced fuel cell technology and polygeneration
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In recent decades, the use of fossil fuels has increased exponentially with a corresponding sharp increase in the pollution of the environment. The need for clean and sustainable technologies for the generation of power with reduced or zero environment impact has become critical. A number of attempts have been made to address this problem; one of the most promising attempts is polygeneration. Polygeneration technology is highly efficient and produces lower emissions than conventional methods of power generation because of the simultaneous generation of useable heat and electrical power from a single source of fuel. The overall efficiency of such systems can be as high as 90%, compared to 30-35% for conventional single-product power plants.

A number of different technologies are available for polygeneration, such as micro gas turbines, sterling engines, solar systems, and fuel cells. Of these, fuel cell systems offer the most promising technology for polygeneration because of their ability to produce electricity and heat at a high efficiency (about 80%) with either low or zero emissions. Various fuel-cell technologies can be used in polygeneration systems. Of these, solid oxide fuel cells (SOFCs) are the most suitable because they offer high system efficiency for the production of electricity and heat (about 90%) coupled with low or zero emissions. Compared to other types of fuel cells, SOFCs have fuel flexibility (direct operation on hydrocarbon fuels, such as biogas, bio-ethanol, bio-methanol, etc.) and produce high-quality heat energy. The development of polygeneration systems using SOFCs has generally followed one of two approaches. The first approach involves the design of a SOFC system that operates at a temperature of 850 oC and uses natural gas as a fuel. The second approach uses low-temperature (generally 400-600 oC) SOFC (LTSOFC) systems with biomass, e.g., syngas or liquid fuels, such as bio-methanol and bio-ethanol. The latter systems have strong potential for use in polygeneration.

High-temperature SOFCs have obvious disadvantages, and challenges remain for lowering the cost to meet commercial interest. The SOFC systems need lower operating temperatures to reduce their overall costs.

This thesis focuses on the development of nanocomposites for advanced fuel-cell technology (NANOCOFC), i.e., the next generation SOFCs, which are low-temperature (400-600 oC), marketable, and affordable SOFCs. In addition, new concepts that pertain to fuel-cell science and technology—NANOCOFC (www.nanocofc.com)—are explored and developed. The content of this thesis is divided into five parts:

In the first part of this thesis (Papers 1-5), the two-phase nanocomposite electrolytes, viz. ceria-salt and ceria-oxide, were prepared and studied using different electrochemical techniques. The microstructure and morphology of the composite electrolytes were characterised using XRD, SEM and TEM, and the thermal analysis was conducted using DSC. An ionic conductivity of 0.1 S/cm was obtained at 300 ºC, which is comparable to that of conventional YSZ operating at 1000 ºC. The maximum output power density was 1000 mW/cm2 at 550 oC. A co-doped ceria-carbonate was also developed to improve the ionic conductivity, morphology, and performance of the electrolyte.

In the second part of this thesis (Papers 7-9), composite electrodes that contained less or no nickel (Ni) were developed for a low-temperature SOFC. All of the elements were highly homogenously distributed in the composite electrode, which resulted in high catalytic activity and good ASOFC performance. The substitution of Ni by Zn in these electrodes could reduce their cost by a factor of approximately 25.

In the third part of this thesis (Papers 10), an advanced multi-fuelled solid-oxide fuel cell (ASOFC) with functional nanocomposites (electrolytes and electrodes) was developed. Several different types of fuel, such as gaseous (hydrogen and biogas) and liquid fuels (bio-ethanol and bio-methanol), were tested. Maximum power densities of 1000, 300, 600, and 550 mW/cm2 were achieved with hydrogen, bio-gas, bio-methanol, and bio-ethanol, respectively, in the ASOFC. Electrical and total efficiencies of 54% and 80%, respectively, were achieved when the single cell was used with hydrogen.

The fourth part of this thesis (Papers 11) concerns the design of a 5 kW ASOFC system based on the demonstrated advanced SOFC technology. A polygeneration system based on a low-temperature planar SOFC was then designed and simulated. The efficiency of the overall system was approximately 80%.

The fifth part of this thesis (Paper 12) describes a single-layer multi-fuelled electrolyte-free fuel cell that is a revolutionary innovation in renewable-energy sources. Conventional fuel cells generate electricity by ion transport through the electrolyte. However, this new device works without an electrolyte, and all of the processes occur at particle surfaces in the material. Based on a theoretical calculation, an additional 18% enhancement of the fuel cell’s efficiency will be achieved using this new technology compared to the conventional technologies.

Our developed ASOFC systems with functional nanocomposites offer significant advantages in reducing the operational and capital costs for the production of power and heat by using different fuels based on the fuel-cell technology. ASOFC systems can be used for polygeneration with renewable fuels (i.e., biomass fuels) at high efficiency as a sustainable solution to energy generation in our society. The results have been achieved for this thesis work has demonstrated an advanced fuel cell technology.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. , xx, 83 p.
Series
TRITA-KRV, 12:10
Keyword [en]
Polygeneration, advanced fuel cell, functional materials, ceria-carbonate nanocomposites, multi-fuelled, electrolyte free fuel cell
National Category
Energy Engineering
Research subject
SRA - Energy
Identifiers
URN: urn:nbn:se:kth:diva-51476ISBN: 978-91-7501-191-2 (print)OAI: oai:DiVA.org:kth-51476DiVA: diva2:464166
Public defence
2011-12-19, Sal (M2), Brinellvägen 64 Entreplan, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
StandUp
Note

QC 20111213

Available from: 2011-12-13 Created: 2011-12-12 Last updated: 2017-05-23Bibliographically approved
List of papers
1. Enhancement of conductivity in ceria-carbonate nanocomposites for LTSOFCs
Open this publication in new window or tab >>Enhancement of conductivity in ceria-carbonate nanocomposites for LTSOFCs
Show others...
2009 (English)In: Journal of nano research, ISSN 1662-5250, Vol. 6, 197-204 p.Article in journal (Refereed) Published
Abstract [en]

This work first explores high resolution transmission electron microscopy (TEM) to determine the interfacial regions and provide experimental evidences for interfaces between the SDC and carbonate constituent phases of the SD-carbonate two-phase composites to further investigate the superionic conduction mechanism in the ceria-carbonate composite systems and enhancement of conductivity. Schober first reported interfacial superionic conduction in ceria-based composites but without direct experimental proofs. Such superionic conduction mechanism remains unknown. Especially, in the nano-scale, this region is trifle to be detected.

Place, publisher, year, edition, pages
STAFA-ZUERICH: Trans Tech Publications Inc., 2009
Keyword
enhanced conductvity, low temperature solid oxide fuel cell
National Category
Nano Technology
Research subject
SRA - Energy
Identifiers
urn:nbn:se:kth:diva-50239 (URN)10.4028/www.scientific.net/JNanoR.6.197 (DOI)000271239000021 ()2-s2.0-74949126697 (Scopus ID)
Funder
StandUp
Note
QC 20111206Available from: 2011-12-03 Created: 2011-12-03 Last updated: 2011-12-13Bibliographically approved
2. Improved ceria-carbonate composite electrolytes
Open this publication in new window or tab >>Improved ceria-carbonate composite electrolytes
Show others...
2010 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 35, no 7, 2684-2688 p.Article in journal (Refereed) Published
Abstract [en]

It has been successfully demonstrated that the fuel cells using the ceria-carbonate composite as electrolytes have achieved excellent performances of 200-1150 W/cm(2) at 300-600 degrees C. Previously it was reported these ceria-carbonate composite electrolytes have been prepared with two-step processes: step 1, prepare ion-doped ceria which was prepared usually through the wet-chemical co-precipitation process; step 2, mixing the doped ceria with carbonates in various compositions. We first report here to prepare the SDC-carbonate composites within one-step chemical co-precipitation process, i.e. mixing carbonates and preparing the SDC in the same process. The one-step process has provided a number of advantages: (i) to reduce the involved preparation processes to enhance the production, to make the produced materials in good quality control, more homogenous composites microstructure; (ii) as results, these composites showed also different microstructures and electrical properties. It has significantly improved the ceria-carbonate conductivities and cause the superionic conduction at much lower temperatures; (iii) to reduce manufacturing costs also.

Keyword
Low temperature, Ceria-carbonate, Nanocomposites, Interfacial mechanism, Superionic conduction
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-29901 (URN)10.1016/j.ijhydene.2009.04.038 (DOI)000276692800022 ()2-s2.0-77951024774 (Scopus ID)
Note
QC 20110218 3rd International Hydrogen Forum, Tsinghua Univ, Changsha, PEOPLES R CHINA, AUG 03-06, 2008Available from: 2011-02-18 Created: 2011-02-17 Last updated: 2017-12-11Bibliographically approved
3. Study on Nanocomposites Based on Carbonate@Ceria
Open this publication in new window or tab >>Study on Nanocomposites Based on Carbonate@Ceria
Show others...
2010 (English)In: Journal of Nanoscience and Nanotechnology, ISSN 1533-4880, E-ISSN 1533-4899, Vol. 10, no 2, 1203-1207 p.Article in journal (Refereed) Published
Abstract [en]

Nanocomposites based on the ceria-carbonate composite have demonstrated as electrolytes in development of successful 300-600 oC fuel cell technology. In this paper, the nanocomposite electrolyte based on carbonate@SDC (SDC: samarium doped ceria) was directly synthesized from the co-precipitation method and characterized by XRD, SEM, TEM, BET, etc. It was proved that the carbonate@SDC was a two-phase material with average particle size about 14.5 nm (S-BET) and crystalline size (D-XRD) ranged from 12 to 14 nm. When the carbonate@SDC electrolyte was used to fabricate single SOFC, the cell shows remarkable performance with maximum power density 1000-1180 mW/cm2 at low temperature (300-550 oC).

Keyword
Nanocomposites, Ceria, Sodium Carbonate, Amorphous, Coated Ceria
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-30225 (URN)10.1166/jnn.2010.1857 (DOI)000273709900078 ()2-s2.0-77955012259 (Scopus ID)
Conference
International Conference on Surface, Coatings and Nanostructured Materials Barcelona, SPAIN, OCT 21-24, 2008
Note

QC 20110221

Available from: 2011-02-21 Created: 2011-02-21 Last updated: 2017-12-11Bibliographically approved
4. Study on calcium and samarium co-doped ceria based nanocomposite electrolytes
Open this publication in new window or tab >>Study on calcium and samarium co-doped ceria based nanocomposite electrolytes
2010 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 195, no 19, 6491-6495 p.Article in journal (Refereed) Published
Abstract [en]

Calcium co-doped SDC-based nanocomposite electrolyte (Ce0.8Sm0.2-xCaxO2-delta-Na2CO3) was synthesized by a co-precipitation method. The microstructure and morphology of the composite electrolytes were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM), and thermal properties were determined with differential scanning calorimetry (DSC). The particle size, as shown by TEM imaging, was 5-20 nm, which is in a good agreement with the SEM and XRD results. The co-doping effect on both interfaces of the composite electrolyte and doped bulk effect inside the ceria was studied. The excellent performance of the fuel cell was about 1000 mW cm(-2) at 560 degrees C and at the very low temperature of 350 degrees C the power density was 200 mW cm(-2). This paper may give a new approach to develop functional nanocomposite electrolyte for low-temperature solid oxide fuel cell (LTSOFC). (C) 2010 Elsevier B.V. All rights reserved.

Keyword
Co-doped, Ceria, Nanocomposite electrolyte, LTSOFCs
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:kth:diva-27237 (URN)10.1016/j.jpowsour.2010.04.031 (DOI)000279459500033 ()2-s2.0-77953133066 (Scopus ID)
Note
QC 20101228Available from: 2010-12-28 Created: 2010-12-09 Last updated: 2017-12-11Bibliographically approved
5. Electrochemical study of the composite electrolyte based on samaria-doped ceria and containing yttria as a second phase
Open this publication in new window or tab >>Electrochemical study of the composite electrolyte based on samaria-doped ceria and containing yttria as a second phase
Show others...
2011 (English)In: Solid State Ionics, ISSN 0167-2738, E-ISSN 1872-7689, Vol. 188, no 1, 58-63 p.Article in journal (Refereed) Published
Abstract [en]

The purpose of this study is to develop new oxide ionic conductors based on nanocomposite materials for an advanced fuel cell (NANOCOFC) approach. The novel two phase nanocomposite oxide ionic conductors, Ce0.8Sm0.2O2-delta (SDC)-Y2O3 were synthesized by a co-precipitation method. The structure and morphology of the prepared electrolyte were investigated by means of X-ray diffraction (XRD) and high resolution scanning electron microscopy (HRSEM). XRD results showed a two phase composite consisting of yttrium oxide and samaria doped ceria and SEM results exhibited a nanostructure form of the sample. The yttrium oxide was used on the SDC as a second phase. The interface between two constituent phases and the ionic conductivities were studied with electrochemical impedance spectroscopy (EIS). An electrochemical study showed high oxide ion mobility and conductivity of the Y2O3-SDC two phase nanocomposite electrolytes at a low temperature (300-600 degrees C). Maximum conductivity (about 1.0 S cm(-1)) was obtained for the optimized Y2O3-SDC composite electrolyte at 600 degrees C. It is found that the nanocomposite electrolytes show higher conductivities with the increased concentration of yttrium oxides but decreases after reaching a certain level. A high fuel cell performance, 0.75 W cm(-2), was achieved at 580 degrees C.

Keyword
Interfaces, Electrochemical impedance spectroscopy (EIS), Oxides, Doped ceria
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-35109 (URN)10.1016/j.ssi.2010.11.002 (DOI)000291116700012 ()2-s2.0-79954989972 (Scopus ID)
Note
QC 20110630Available from: 2011-06-30 Created: 2011-06-20 Last updated: 2017-12-11Bibliographically approved
6. Electrochemical study on co-doped ceria-carbonate composite electrolyte
Open this publication in new window or tab >>Electrochemical study on co-doped ceria-carbonate composite electrolyte
Show others...
2012 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 201, 121-127 p.Article in journal (Refereed) Published
Abstract [en]

A co-doped ceria-carbonate (Ce0.8Sm0.2-xCaxO2-delta-Na2CO3) has been synthesized by a co-precipitation method. The detailed electrochemical characterizations (e.g. impedance spectra, polarization curve and IV curves) of this composite material are reported and discussed. The two phase nanocomposite electrolytes with carbonate coated on the co-doped ceria displays dual (H+/O2-) ion conduction at low temperature (300-600 degrees C) in solid oxide fuel cell. The observed remarkable temperature-dependent of conductivity is attributed to the softening/melting of carbonate phase as the physical state of carbonate phase transforms from solid to molten state. Coexistence of various charge carriers, oxide phase composition, and the oxide-carbonate interfacial area are investigated by Raman spectra. The enhancement of conductivity is also discussed by the general mixing rule/percolation theory of composite interfaces. The co-doping with 2nd phase gives a good approach to realize challenges for solid oxide fuel cell.

Keyword
Calcium carbonate, Sodium carbonate, Co-doping, Two phase composite, Ionic conductivity
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-91609 (URN)10.1016/j.jpowsour.2011.10.124 (DOI)000300264400016 ()2-s2.0-83655167035 (Scopus ID)
Note
QC 20120329Available from: 2012-03-29 Created: 2012-03-19 Last updated: 2017-12-07Bibliographically approved
7. A nanostructure anode (Cu0.2Zn0.8) for low-temperature solid oxide fuel cell at 400-600 oC
Open this publication in new window or tab >>A nanostructure anode (Cu0.2Zn0.8) for low-temperature solid oxide fuel cell at 400-600 oC
2010 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 195, no 24, 8067-8070 p.Article in journal (Refereed) Published
Abstract [en]

We developed a new nickel-free anode for a low-temperature solid oxide fuel cell (LTSOFC) that demonstrated an outstanding electrochemical output of 1000 mW cm(-2) at 550 degrees C. The nanostructure anode had good conductivity and was compatible with cerium oxide-based electrolytes. The performance of a single cell was comparable and or better than those using standard Ni-YSZ and Ni-SDC electrodes (anode). It may have applications for hydrocarbon-based fuel for preventing carbon deposition and replacing nickel in the anode of LTSOFCs.

Keyword
Low temperature, Ceramic fuel cell, Nanoparticles, Catalyst
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-26658 (URN)10.1016/j.jpowsour.2010.07.044 (DOI)000282251900021 ()2-s2.0-77956492543 (Scopus ID)
Note

QC 20101203

Available from: 2010-12-03 Created: 2010-11-26 Last updated: 2017-12-12Bibliographically approved
8. Zn0.6Fe0.1Cu0.3/GDC Composite Anode for Solid Oxide Fuel Cell
Open this publication in new window or tab >>Zn0.6Fe0.1Cu0.3/GDC Composite Anode for Solid Oxide Fuel Cell
2011 (English)In: J FUEL CELL SCI TECHNOL, ISSN 1550-624X, Vol. 8, no 3, 031010- p.Article in journal (Refereed) Published
Abstract [en]

Recent research results show that homogeneity and microstructure are very important parameters for the development of low cost materials with better performance for fuel cell applications. This research effort has been contributed in the development of low temperature solid oxide fuel cell (LTSOFC) material and technology as well as applications for polygeneration. The microstructure and electrochemical analyses were conducted. We found a series of new electrode materials which can run solid oxide fuel cell at 300-600 degrees C range with high performances, e. g., a high power density output of 980 mW cm(-2) was obtained at 570 degrees C. The fuel cell electrodes were prepared from metal oxide materials through a solid state reaction and then mixed with doped ceria. The obtained results have many advantages for the development of LTSOFCs for polygeneration. The nanostructure of the anode has been studied by high-resolution electron microscopy, the crystal structure and lattice parameters have also been studied by X-ray diffraction. The electrical conductivity of the composite anode was studied by electrochemical impedance spectra.

Keyword
ZnO, metal oxide, anode, impedance spectra, electrical conductivity
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-31623 (URN)10.1115/1.4002904 (DOI)000287882300010 ()2-s2.0-80052537900 (Scopus ID)
Funder
Swedish Research Council
Note
QC 20110324Available from: 2011-03-24 Created: 2011-03-21 Last updated: 2011-12-13Bibliographically approved
9. ZnO/NiO nanocomposite electrodes for low-temperature solid oxide fuel cells
Open this publication in new window or tab >>ZnO/NiO nanocomposite electrodes for low-temperature solid oxide fuel cells
Show others...
2011 (English)In: Electrochemistry communications, ISSN 1388-2481, E-ISSN 1873-1902, Vol. 13, no 9, 917-920 p.Article in journal (Refereed) Published
Abstract [en]

ZnO/NiO nanocomposite electrodes have successfully been developed using a cost-effective method, and for the first time used in LT-SOFCs at 300-600 degrees C. They exhibit high conductivity and a dual catalytic functionality in both the cathode and the anode for the electrochemical reduction of O(2) and oxidation of H(2), respectively. An excellent fuel cell performance, e.g. a maximum power density of 1107 W cm(-2), has been shown for a symmetrical fuel cell that contained ZnO/NiO nanocomposite electrodes at 500 degrees C. To our knowledge, to date this is by far the highest power density achieved at this temperature.

Keyword
ZnO/NiO, Nanocomposites, Composite electrodes, SOFCs
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-42374 (URN)10.1016/j.elecom.2011.05.032 (DOI)000294940600006 ()2-s2.0-79960977975 (Scopus ID)
Note
QC 20111010Available from: 2011-10-10 Created: 2011-10-10 Last updated: 2017-12-08Bibliographically approved
10. Advanced Multi-Fuelled Solid Oxide Fuel Cells (ASOFCs) Using Functional Nanocomposites for Polygeneration
Open this publication in new window or tab >>Advanced Multi-Fuelled Solid Oxide Fuel Cells (ASOFCs) Using Functional Nanocomposites for Polygeneration
Show others...
2011 (English)In: Advanced Energy Materials, ISSN 1614-6840, Vol. 1, no 6, 1225-1233 p.Article in journal (Refereed) Published
Abstract [en]

An advanced multifuelled solid oxide fuel cell (ASOFC) with a functional nanocomposite was developed and tested for use in a polygeneration system. Several different types of fuel, for example, gaseous (hydrogen and biogas) and liquid fuels (bio-ethanol and bio-methanol), were used in the experiments. Maximum power densities of 1000, 300, 600, 550 mW cm−2 were achieved using hydrogen, bio-gas, bio-methanol, and bio-ethanol, respectively, in the ASOFC. Electrical and total efficiencies of 54% and 80% were achieved using the single cell with hydrogen fuel. These results show that the use of a multi-fuelled system for polygeneration is a promising means of generating sustainable power.

Place, publisher, year, edition, pages
Germany: Wiley-VCH Verlagsgesellschaft, 2011
Keyword
nanocomposite, polygeneration, anode
National Category
Energy Engineering
Research subject
SRA - Energy
Identifiers
urn:nbn:se:kth:diva-50238 (URN)10.1002/aenm.201100318 (DOI)000297056500039 ()2-s2.0-84863687621 (Scopus ID)
Funder
StandUp
Note
QC 20111206Available from: 2011-12-03 Created: 2011-12-03 Last updated: 2011-12-19Bibliographically approved
11. Design of a 5-kW advanced fuel cell polygeneration system
Open this publication in new window or tab >>Design of a 5-kW advanced fuel cell polygeneration system
2012 (English)In: Wiley Interdisciplinary Reviews: Energy and Environment, ISSN 2041-8396, Vol. 1, no 2, 173-180 p.Article in journal (Refereed) Published
Abstract [en]

In this article, a planar, low-temperature, solid-oxide fuel cell based on nanocomposite materials is developed by cost-effective tape casting and hot-pressing methods. First, a single cell with active area of 6 × 6 cm2 was manufactured and tested to determine the cell performance. The power density of 0.4 and 0.7 W cm-2 were achieved at stable open-circuit voltages at operating temperature of 550°C using the syngas and hydrogen, respectively. Based on these experimental results, a 5-kW low-temperature, solid-oxide fuel cell polygeneration system is designed and analyzed. This system can provide electrical power and heating concurrently from a single source of fuel. The system design and the energy and mass balance are presented and a simulation based on syngas is performed. Finally, effects of fuel utilization factor, fuel cell operating temperature, and air temperature at cathode inlet on performance of polygeneration system is investigated.

Place, publisher, year, edition, pages
WIRES, 2012
Keyword
SOFC, 5kW, stack
National Category
Energy Engineering
Research subject
SRA - Energy
Identifiers
urn:nbn:se:kth:diva-50237 (URN)10.1002/wene.6 (DOI)000209097900005 ()2-s2.0-84877700405 (Scopus ID)
Funder
StandUp
Note

QC 20130801. Updated from accepted to published.

Available from: 2011-12-03 Created: 2011-12-03 Last updated: 2015-06-23Bibliographically approved
12. An Electrolyte-Free Fuel Cell Constructed from One Homogenous Layer with Mixed Conductivity
Open this publication in new window or tab >>An Electrolyte-Free Fuel Cell Constructed from One Homogenous Layer with Mixed Conductivity
2011 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 21, no 13, 2465-2469 p.Article in journal (Refereed) Published
Abstract [en]

Rather than using three layers, including an electrolyte, a working fuel cell is created that employs only one homogenous layer with mixed conductivity. The layer is a composite made from a mixture of metal oxide, Li(0.15)Ni(0.45)Zn(0.4) oxide, and an ionic conductor; ion-doped ceria. The single-component layer has a total conductivity of 0.1-1 S cm(-1) and exhibits both ionic and semiconducting properties. This homogenous one-layer device has a power output of more than 600 mW cm(-2) at 550 degrees C operating with H(2) and air. Overall conversion is completed in a similar way to a traditional fuel cell, even though the device does not include the electrolyte layer critical for traditional fuel-cell technologies using the three-component anode-electrolyte-cathode structure.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-37157 (URN)10.1002/adfm.201002471 (DOI)000292707700008 ()2-s2.0-79960010008 (Scopus ID)
Available from: 2011-08-03 Created: 2011-08-02 Last updated: 2017-12-08Bibliographically approved

Open Access in DiVA

Raza PhD Thesis 2011(2843 kB)2892 downloads
File information
File name FULLTEXT01.pdfFile size 2843 kBChecksum SHA-512
95c1695eb8e9c68d62431dd632b56b1beaf1ef082191d324ac0775f723469d4eed93c9e096fcbbf315b6a66aa31e8590f1758c8ebc62e657ce526aaaad1455ed
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Raza, Rizwan
By organisation
Heat and Power Technology
Energy Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 2892 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 566 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf