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Raza, Rizwan
Publications (6 of 6) Show all publications
Hussain, F., Ahmad, M. A., Badshah, S., Raza, R., Khan, M. A., Mumtaz, S., . . . Abbas, G. (2019). A modeling approach for low-temperature SOFC-based micro-combined heat and power systems. International Journal of Modern Physics B, 33(4), Article ID 1950001.
Open this publication in new window or tab >>A modeling approach for low-temperature SOFC-based micro-combined heat and power systems
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2019 (English)In: International Journal of Modern Physics B, ISSN 0217-9792, Vol. 33, no 4, article id 1950001Article in journal (Refereed) Published
Abstract [en]

The world's challenge is to determine a more efficient, economical and environmental-friendly energy source to compete and replace the ongoing conventional energy resources. Solid oxide fuel cells (SOFCs) provide a highly efficient system to use divergent energy resources and have proved to provide the cleanest energy, least energy use, and lowest emissions. A techno-economic study is required to investigate the model design for SOFC-based micro-combined heat and power (m-CHP) systems for applications in terms of educational and commercial buildings. This work models and explores the optimized application of hydrogen gas-fueled SOFC-based m-CHP systems in educational buildings. Two educational departments' loads are presented and model of SOFC-based m-CHP system against the different electric power demands is performed, in order to provide a techno-economic assessment of the technology. For successful development of the technology, results are related to system rightsizing, operating strategies, thermal to electric ratios, and match between end-use, with an aim towards classifying the overall feasibility and essential application requirements.

Place, publisher, year, edition, pages
WORLD SCIENTIFIC PUBL CO PTE LTD, 2019
Keywords
Energy systems model, fuel cells, low-temperature, micro-combined heat and power, solid oxide fuel cell
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-245927 (URN)10.1142/S0217979219500012 (DOI)000459292200002 ()2-s2.0-85061489612 (Scopus ID)
Note

QC 20190312

Available from: 2019-03-12 Created: 2019-03-12 Last updated: 2019-04-04Bibliographically approved
Hussain, F., Abbas, G., Ahmad, M. A., Raza, R., Rehman, Z. U., Mumtaz, S., . . . Dilshad, S. (2019). Comparative electrochemical investigation of zinc based nano-composite anode materials for solid oxide fuel cell. Ceramics International, 45(1), 1077-1083
Open this publication in new window or tab >>Comparative electrochemical investigation of zinc based nano-composite anode materials for solid oxide fuel cell
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2019 (English)In: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, Vol. 45, no 1, p. 1077-1083Article in journal (Refereed) Published
Abstract [en]

The structural and electrochemical properties of zinc based nano-composites anode materials with a composition of X0.25Ti0.5Zn0.70 (where X = Cu, Mn, Ag) have been investigated in this present study. The proposed Xo.zsTiousZno.70 oxide materials have been synthesized through sol-gel method. The doping effect of Cu, Mn, and Ag on TiZn oxides were analyzed in terms of electronic conduction and power density in hydrogen atmosphere at comparatively low temperature in the range of 650 degrees C. The crystal structure and surface morphology were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis techniques. The XRD patterns of composites depict that the average crystalline sizes lie in the range of 20-100 nm. Four -probe DC conductivity technique was used to measure the conductivity of the materials and maximum electrical conductivity of Ag0.25Ti0.05Zn0.70 oxide was found to be 7.81 S/cm at 650 degrees C. The band gap and absorption spectra were determined by ultra-violet visible (UV-Vis) and Fourier Transform Infrared spectroscopy (FTIR) techniques respectively. The maximum power density was achieved to be 354 mW/cm(2) at 650 degrees C by Ag0.25Ti0.05Zn0.70 oxide anode with SDC (electrolyte) and BSCF (conventional cathode) materials.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Nano-composite anode, Low temperature SOFC, Zinc based materials, Non-symmetrical cell, Silver catalyst
National Category
Ceramics
Identifiers
urn:nbn:se:kth:diva-240703 (URN)10.1016/j.ceramint.2018.09.288 (DOI)000452570300134 ()2-s2.0-85054184159 (Scopus ID)
Note

QC 20190104

Available from: 2019-01-04 Created: 2019-01-04 Last updated: 2019-01-04Bibliographically approved
Hussain, F., Ahmad, M. A., Raza, R., Khan, M. A., Rehman, Z. U., Riaz, R. A. & Abbas, G. (2019). Electrochemical investigation of multi-fuel based low temperature nano-composite anode for solid oxide fuel cell. Journal of Power Sources, 425, 147-152
Open this publication in new window or tab >>Electrochemical investigation of multi-fuel based low temperature nano-composite anode for solid oxide fuel cell
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2019 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 425, p. 147-152Article in journal (Refereed) Published
Abstract [en]

Extensive efforts have been made in order to develop multi-fuel-based low temperature solid oxide fuel cell for direct conversion of hydrocarbons to electric power. It is extremely difficult to operate due to the C–H activation and its tremendously sluggish oxidation reduction in the low temperature range from 300 to 600 °C. The structural and electrochemical properties of novel anode material Ni 0.6 (Ba 0.3 Ce 0.2 Zn 0.5 ) 0.4 have been investigated in the presence of hydrogen, natural gas, ethanol, glucose, and sugar-cane at low temperature of 600 °C. Through sol-gel method the proposed oxide material is synthesized. The composite average crystalline size has been found 25–90 nm by both scanning electron microscopy and X-ray diffraction techniques. The ultraviolet– visible and Fourier transform infrared techniques are used to determine band gap and absorption spectrum respectively. The power density of the cell at various fuels has been observed and measurements indicate that it varies from 57 to 315 mWcm −2 at 600 °C among different fuels at anode side. The current study reveals that proposed anode Ni 0.6 (Ba 0.3 Ce 0.2 Zn 0.5 ) 0.4 is promising multi-fuel anode material for low-temperature solid oxide fuel cell, and it does not need to reform hydrocarbon fuels in order to fully utilize the advantage of these cells.

Place, publisher, year, edition, pages
Elsevier B.V., 2019
Keywords
Anode material, LT-SOFC, Multi-fuel, Non-symmetrical cell
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-252474 (URN)10.1016/j.jpowsour.2019.04.002 (DOI)000468717900018 ()2-s2.0-85064089341 (Scopus ID)
Note

QC 20190712

Available from: 2019-07-12 Created: 2019-07-12 Last updated: 2019-07-12Bibliographically approved
Ali, A., Raza, R., Kaleem Ullah, M., Rafique, A., Wang, B. & Zhu, B. (2018). Alkaline earth metal and samarium co-doped ceria as efficient electrolytes. Applied Physics Letters, 112(4), Article ID 043902.
Open this publication in new window or tab >>Alkaline earth metal and samarium co-doped ceria as efficient electrolytes
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2018 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 112, no 4, article id 043902Article in journal (Refereed) Published
Abstract [en]

Co-doped ceramic electrolytes M0.1Sm0.1Ce0.8O2-δ (M = Ba, Ca, Mg, and Sr) were synthesized via co-precipitation. The focus of this study was to highlight the effects of alkaline earth metals in doped ceria on the microstructure, densification, conductivity, and performance. The ionic conductivity comparisons of prepared electrolytes in the air atmosphere were studied. It has been observed that Ca0.1Sm0.1Ce0.8O2-δ shows the highest conductivity of 0.124 Scm-1 at 650 °C and a lower activation energy of 0.48 eV. The cell shows a maximum power density of 630 mW cm-2 at 650 °C using hydrogen fuel. The enhancement in conductivity and performance was due to increasing the oxygen vacancies in the ceria lattice with the increasing dopant concentration. The bandgap was calculated from UV-Vis data, which shows a red shift when compared with pure ceria. The average crystallite size is in the range of 37-49 nm. DFT was used to analyze the co-doping structure, and the calculated lattice parameter was compared with the experimental lattice parameter.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2018
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-222299 (URN)10.1063/1.5005824 (DOI)000423724300048 ()2-s2.0-85041125633 (Scopus ID)
Note

QC 20180206

Available from: 2018-02-06 Created: 2018-02-06 Last updated: 2018-02-22Bibliographically approved
Tariq, S., Marium, A., Raza, R., Ashfaq Ahmad, M., Ajmal Khan, M., Abbas, G., . . . Ikram, M. (2018). Comparative study of Ce0.80Sm0.20 Ba0.80Y0.20O3-δ (YB-SDC) electrolyte by various chemical synthesis routes. Results in Physics, 8, 780-784
Open this publication in new window or tab >>Comparative study of Ce0.80Sm0.20 Ba0.80Y0.20O3-δ (YB-SDC) electrolyte by various chemical synthesis routes
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2018 (English)In: Results in Physics, ISSN 2211-3797, Vol. 8, p. 780-784Article in journal (Refereed) Published
Abstract [en]

Solid Oxide Fuel Cells is received a significant attention in recent years due to higher efficiency and fuel flexibility. The one of the main challenge for SOFC is to lower the operating temperature of SOFCs. Therefore, different strategies are used in order to enhance the ionic conduction of electrolyte, which can lower the overall SOFC operating temperature. The present work is focused on this strategy to enhance the electrolytic conductivity. Therefore, the ceria based composite electrolytes Ce0.80Sm0.20B0.80Y0.20O3-δ (YBSDC) are synthesized using three different approaches i.e. co-precipitation (YBSDC-1), sol-gel (YBSDC-2) and ball milling (YBSDC-3). Their crystal structures and surface morphologies are characterized through X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) techniques, respectively. The four-probe technique is employed to measure their dc conductivities in the temperature range (300–700) °C under air atmosphere. The open circuit voltage (OCV) and current are recorded with natural gas as fuel {flow rate kept at 100 ml min−1 at 1 atm pressure} over the temperature range (300–600) °C. The electrolyte (YBSDC-1) prepared by co-precipitation technique is shown better results as compare to other two electrolytes (YBSDC-2 and YBSDC-3). The electrolyte (YBSDC-1) having maximum dc conductivity (0.096 S/cm), peak power density 224 mW cm−2 and OCV 0.94 V at 600 °C. These results show that YBSDC-1electrolyte is potential candidate for low temperature SOFCs.

Place, publisher, year, edition, pages
Elsevier B.V., 2018
Keywords
Ball milling, Composite, Conductor, Energy, Hydrogen
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-227423 (URN)10.1016/j.rinp.2018.01.011 (DOI)000428027700108 ()2-s2.0-85044637532 (Scopus ID)
Note

Export Date: 9 May 2018; Article; Correspondence Address: Raza, R.; Department of Physics, COMSATS Institute of Information TechnologyPakistan; email: razahussaini786@gmail.com. QC 20180529

Available from: 2018-05-29 Created: 2018-05-29 Last updated: 2018-05-29Bibliographically approved
Ali, A., Shehzad Bashir, F., Raza, R., Rafique, A., Kaleem Ullah, M., Alvi, F., . . . Belova, L. (2018). Electrochemical study of composite materials for coal-based direct carbon fuel cell. International journal of hydrogen energy, 43(28), 12900-12908
Open this publication in new window or tab >>Electrochemical study of composite materials for coal-based direct carbon fuel cell
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2018 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 43, no 28, p. 12900-12908Article in journal (Refereed) Published
Abstract [en]

The efficient conversion of solid carbon fuels into energy by reducing the emission of harmful gases is important for clean environment. In this regards, direct carbon fuel cell (DCFC) is a system that converts solid carbon directly into electrical energy with high thermodynamic efficiency (100%), system efficiency of 80% and half emission of gases compared to conventional coal power plants. This can generate electricity from any carbonaceous fuel such as charcoal, carbon black, carbon fiber, graphite, lignite, bituminous coal and waste materials. In this paper, ternary carbonate-samarium doped ceria (LNK-SDC) electrolyte has been synthesized via co-precipitation technique, while LiNiCuZnFeO (LNCZFO) electrode has been prepared using solid state reaction method. Due to significant ionic conductivity of electrolyte LNK-SDC, it is used in DCFC. Three types of solid carbon (lignite, bituminous, sub-bituminous) are used as fuel to generate power. The X-ray diffraction confirmed the cubic crystalline structure of samarium doped ceria, whereas XRD pattern of LNCZFO showed its composite structure. The proximate and ultimate coal analysis showed that fuel (carbon) with higher carbon content and lower ash content was promising fuel for DCFC. The measured ionic conductivity of LNK-SDC is 0.0998 Scm−1 and electronic conductivity of LNCZFO is 10.1 Scm−1 at 700 °C, respectively. A maximum power density of 58 mWcm−2 is obtained using sub-bituminous fuel.

Place, publisher, year, edition, pages
Elsevier Ltd, 2018
Keywords
Bituminous, Lignite, LNK-SDC, Proximate and ultimate analysis, Sub-bituminous, Bituminous coal, Carbon black, Carbon fibers, Cerium oxide, Charcoal, Copper compounds, Electrolytes, Energy efficiency, Fuel cell power plants, Ionic conductivity, Iron compounds, Lithium compounds, Nickel compounds, Samarium, Solid state reactions, Zinc compounds, Electrochemical studies, Electronic conductivity, Solid state reaction method, Thermodynamic efficiency, Ultimate analysis, Direct carbon fuel cells (DCFC)
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-238082 (URN)10.1016/j.ijhydene.2018.05.104 (DOI)000439678700036 ()2-s2.0-85048539184 (Scopus ID)
Note

Export Date: 30 October 2018; Article; CODEN: IJHED; Correspondence Address: Raza, R.; Clean Energy Research Lab (CERL), Department of Physics, COMSATS University Islamabad, Lahore CampusPakistan; email: razahussaini786@gmail.com

QC 20190111

Available from: 2019-01-11 Created: 2019-01-11 Last updated: 2019-01-11Bibliographically approved
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