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Zhang, J., Hao, Y., Yang, L., Mohammadi, H., Vlachopoulos, N., Sun, L., . . . Sheibani, E. (2019). Electrochemically polymerized poly (3, 4-phenylenedioxythiophene) as efficient and transparent counter electrode for dye sensitized solar cells. Electrochimica Acta, 300, 482-488
Open this publication in new window or tab >>Electrochemically polymerized poly (3, 4-phenylenedioxythiophene) as efficient and transparent counter electrode for dye sensitized solar cells
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2019 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 300, p. 482-488Article in journal (Refereed) Published
Abstract [en]

A new conducting polymer poly (3, 4-phenylenedioxythiophene) is synthesized by the electrochemical polymerization technique with different solvents. We find that solvents used in electrochemical polymerization play important roles for the catalytic activity and morphology of the formed conducting polymers. The obtained poly (3, 4-phenylenedioxythiophene) is for the first time employed as counter electrode electrocatalyst in dye sensitized solar cells with cobalt-based electrolytes. We demonstrate that a polymer prepared from a mixed acetonitrile-dichloromethane solvent exhibit higher catalytic activity for redox reactions, as compared to that from a single solvent, dichloromethane. The devices based on this mixed solvent-based polymer from a mixed solvents show a high power conversion efficiency of 5.97%. An additional advantageous feature of the electrochemically polymerized poly (3, 4-phenylenedioxythiophene) for solar cell applications is the high transparency in the visible and nearinfrared region. We also investigate the beneficial effect of the poly (3, 4-phenylenedioxythiophene) layer thickness on device performance, and concluded that the series resistance and charge transfer resistance are greatly influenced by the thickness of polymer, as evidenced by electrochemical impedance spectroscopy measurements. The optimal thickness for poly (3, 4-phenylenedioxythiophene) is about 100 nm. Furthermore, the high catalytic activity and transparency of the new conducting polymer as counter electrode shows great promise for other optoelectronic applications.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2019
Keywords
poly(PheDOT), Counter electrode, Dye sensitized solar cells, Electrochemical polymerization
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-245127 (URN)10.1016/j.electacta.2019.01.006 (DOI)000458488200057 ()2-s2.0-85061301933 (Scopus ID)
Note

QC 20190315

Available from: 2019-03-15 Created: 2019-03-15 Last updated: 2019-03-15Bibliographically approved
Elawad, M., Sun, L., Mola, G. T., Yu, Z. & Arbab, E. A. (2019). Enhanced performance of perovskite solar cells using p-type doped PFB:F4TCNQ composite as hole transport layer. Journal of Alloys and Compounds, 771, 25-32
Open this publication in new window or tab >>Enhanced performance of perovskite solar cells using p-type doped PFB:F4TCNQ composite as hole transport layer
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2019 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 771, p. 25-32Article in journal (Refereed) Published
Abstract [en]

Conjugated polymers have been widely used as hole transport materials (HTM) in the preparation of mesoscopic perovskite solar cells (PSCs). In this work, we employed p-type doped conducting polymer known as poly(9,9-dioctylfluorene-co-bis-N,N-(-4-butyl phenyl)-bis-N,N-phenyl-1,4-phenylenediamine) (PFB) as a hole transport material (HTM) in perovskite based solar cell. The effect of dopant concentration on the optical and electrical properties of PEB was investigated to optimize the electrical properties of the material for the best function of the solar cell. The highest power conversion efficiency of mesoscopic perovskite solar cells (PSCs), fabricated in this investigation, was found to be 14.04% which is 57% higher than that of pristine PFB hole transport layer. The UV–Vis absorption and Raman spectroscopy measurements confirm the occurrence of oxidation in a p-type doped PFB hole transport layer. This is attributed to the transfer of electrons from the highest occupied molecular orbital (HOMO) of PEB to the lowest unoccupied molecular orbital (LUMO) of F4TCNQ. The solar cells produced using p-type doped PFB:F4TCNQ composite not only improves device performances but also shows superior long-term stability. The optical, morphological and electrical properties of the doped composite PFB: F4TCNQ and newly fabricated devices are presented and discussed in this paper.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Device stability, Hole transport material, P-type PFB, Perovskite, Solar cell, Conducting polymers, Conjugated polymers, Doping (additives), Hole mobility, Molecular orbitals, Perovskite solar cells, Photoconducting materials, Polymer solar cells, Superconducting materials, Highest occupied molecular orbital, Hole transport materials, Lowest unoccupied molecular orbital, N-phenyl-1, 4-phenylenediamine, Optical and electrical properties, P-type, Raman spectroscopy measurements, Solar cells
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-236331 (URN)10.1016/j.jallcom.2018.08.025 (DOI)000449621500004 ()2-s2.0-85052655348 (Scopus ID)
Funder
Swedish Energy AgencyKnut and Alice Wallenberg Foundation
Note

QC 20181109

Available from: 2018-11-09 Created: 2018-11-09 Last updated: 2018-11-28Bibliographically approved
Lee, H., Wu, X., Ye, Q., Wu, X., Wang, X., Zhao, Y. & Sun, L. (2019). Hierarchical CoS2/Ni3S2/CoNiOx nanorods with favorable stability at 1 A cm(-2) for electrocatalytic water oxidation. Chemical Communications, 55(11), 1564-1567
Open this publication in new window or tab >>Hierarchical CoS2/Ni3S2/CoNiOx nanorods with favorable stability at 1 A cm(-2) for electrocatalytic water oxidation
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2019 (English)In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 55, no 11, p. 1564-1567Article in journal (Refereed) Published
Abstract [en]

Herein, we have reported an easily synthesized CoS2/Ni3S2/CoNiOx water oxidation catalyst with excellent catalytic activity and superior durability. The as-prepared catalyst required overpotential (eta) as low as 256 mV to exhibit a current density of 10 mA cm(-2) in 1.0 M KOH. Remarkably, it sustained a current density of 1 A cm(-2) for one week in 30% KOH solution with only 25 mV increment of eta. Thus, it is a hopeful candidate as a highly-effective water oxidation electrode in practical applications.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2019
National Category
Other Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-244518 (URN)10.1039/c8cc09104h (DOI)000457645500003 ()30648178 (PubMedID)2-s2.0-85060927802 (Scopus ID)
Note

QC 20190402

Available from: 2019-04-02 Created: 2019-04-02 Last updated: 2019-04-02Bibliographically approved
Liu, T., Zhang, B. & Sun, L. (2019). Iron-Based Molecular Water Oxidation Catalysts: Abundant, Cheap, and Promising. Chemistry - An Asian Journal, 14(1), 31-43
Open this publication in new window or tab >>Iron-Based Molecular Water Oxidation Catalysts: Abundant, Cheap, and Promising
2019 (English)In: Chemistry - An Asian Journal, ISSN 1861-4728, E-ISSN 1861-471X, Vol. 14, no 1, p. 31-43Article, review/survey (Refereed) Published
Abstract [en]

An efficient and robust water oxidation catalyst based on abundant and cheap materials is the key to converting solar energy into fuels through artificial photosynthesis for the future of humans. The development of molecular water oxidation catalysts (MWOCs) is a smart way to achieve promising catalytic activity, thanks to the clear structures and catalytic mechanisms of molecular catalysts. Efficient MWOCs based on noble-metal complexes, for example, ruthenium and iridium, have been well developed over the last 30 years; however, the development of earth-abundant metal-based MWOCs is very limited and still challenging. Herein, the promising prospect of iron-based MWOCs is highlighted, with a comprehensive summary of previously reported studies and future research focus in this area.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH, 2019
Keywords
artificial photosynthesis, electrochemistry, iron, molecular catalysts, oxidation, water splitting
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-241314 (URN)10.1002/asia.201801253 (DOI)000454953700003 ()30362258 (PubMedID)2-s2.0-85057257052 (Scopus ID)
Note

QC 20190125

Available from: 2019-01-25 Created: 2019-01-25 Last updated: 2019-01-25Bibliographically approved
Jiang, X., Wang, D., Yu, Z., Ma, W., Li, H.-B., Yang, X., . . . Sun, L. (2019). Molecular Engineering of Copper Phthalocyanines: A Strategy in Developing Dopant-Free Hole-Transporting Materials for Efficient and Ambient-Stable Perovskite Solar Cells. ADVANCED ENERGY MATERIALS, 9(4), Article ID 1803287.
Open this publication in new window or tab >>Molecular Engineering of Copper Phthalocyanines: A Strategy in Developing Dopant-Free Hole-Transporting Materials for Efficient and Ambient-Stable Perovskite Solar Cells
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2019 (English)In: ADVANCED ENERGY MATERIALS, ISSN 1614-6832, Vol. 9, no 4, article id 1803287Article in journal (Refereed) Published
Abstract [en]

Copper (II) phthalocyanines (CuPcs) have attracted growing interest as promising hole-transporting materials (HTMs) in perovskite solar cells (PSCs) due to their low-cost and excellent stability. However, the most efficient PSCs using CuPc-based HTMs reported thus far still rely on hygroscopic p-type dopants, which notoriously deteriorate device stability. Herein, two new CuPc derivatives are designed, namely CuPc-Bu and CuPc-OBu, by molecular engineering of the non-peripheral substituents of the Pc rings, and applied as dopant-free HTMs in PSCs. Remarkably, a small structural change from butyl groups to butoxy groups in the substituents of the Pc rings significantly influences the molecular ordering and effectively improves the hole mobility and solar cell performance. As a consequence, PSCs based on dopant-free CuPc-OBu as HTMs deliver an impressive power conversion efficiency (PCE) of up to 17.6% under one sun illumination, which is considerably higher than that of devices with CuPc-Bu (14.3%). Moreover, PSCs containing dopant-free CuPc-OBu HTMs show a markedly improved ambient stability when stored without encapsulation under ambient conditions with a relative humidity of 85% compared to devices containing doped Spiro-OMeTAD. This work thus provides a fundamental strategy for the future design of cost-effective and stable HTMs for PSCs and other optoelectronic devices.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH, 2019
Keywords
copper (II) phthalocyanine, dopant-free, hole-transporting materials, perovskite solar cells, stability
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-243959 (URN)10.1002/aenm.201803287 (DOI)000456712500003 ()2-s2.0-85057714289 (Scopus ID)
Note

QC 20190301

Available from: 2019-03-01 Created: 2019-03-01 Last updated: 2019-03-01Bibliographically approved
Li, Y., Cheng, M., Jungstedt, E., Xu, B., Sun, L. & Berglund, L. (2019). Optically Transparent Wood Substrate for Perovskite Solar Cells. ACS Sustainable Chemistry and Engineering, 7(6), 6061-6067
Open this publication in new window or tab >>Optically Transparent Wood Substrate for Perovskite Solar Cells
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2019 (English)In: ACS Sustainable Chemistry and Engineering, ISSN 2168-0485, Vol. 7, no 6, p. 6061-6067Article in journal (Refereed) Published
Abstract [en]

Transparent wood is a candidate for use as an energy-saving building material due to its low density (ca. 1.2 g/cm(3)), high optical transmittance (over 85% at 1 mm thickness), low thermal conductivity (0.23 W m(-1) K-1), and good load-bearing performance with tough failure behavior (no shattering). High optical transmittance also makes transparent wood a candidate for optoelectronic devices. In this work, for the first time, perovskite solar cells processed at low temperature (<150 degrees C) were successfully assembled directly on transparent wood substrates. A power conversion efficiency up to 16.8% was obtained. The technologies demonstrated may pave the way for integration of solar cells with light transmitting wood building structures for energy-saving purposes.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019
Keywords
Biocomposite, Perovskite solar cell, Energy-Efficient, Building material, Transparent wood, Mechanical properties
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:kth:diva-248333 (URN)10.1021/acssuschemeng.8b06248 (DOI)000461978200051 ()30918764 (PubMedID)2-s2.0-85063061391 (Scopus ID)
Note

QC 20190410

Available from: 2019-04-10 Created: 2019-04-10 Last updated: 2019-04-10Bibliographically approved
Fan, L., Zhang, P., Zhang, B., Daniel, Q., Timmer, B., Zhang, F. & Sun, L. (2018). 3D Core-Shell NiFeCr Catalyst on a Cu Nanoarray for Water Oxidation: Synergy between Structural and Electronic Modulation. ACS ENERGY LETTERS, 3(12), 2865-2874
Open this publication in new window or tab >>3D Core-Shell NiFeCr Catalyst on a Cu Nanoarray for Water Oxidation: Synergy between Structural and Electronic Modulation
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2018 (English)In: ACS ENERGY LETTERS, ISSN 2380-8195, Vol. 3, no 12, p. 2865-2874Article in journal (Refereed) Published
Abstract [en]

Low cost transition metal-based electrocatalysts for water oxidation and understanding their structure-activity relationship are greatly desired for clean and sustainable chemical fuel production. Herein, a core-shell (CS) NiFeCr metal/metal hydroxide catalyst was fabricated on a 3D Cu nanoarray by a simple electrodeposition-activation method. A synergistic promotion effect between electronic structure modulation and nanostructure regulation was presented on a CS-NiFeCr oxygen evolution reaction (OER) catalyst: the 3D nanoarchitecture facilitates the mass transport process, the in situ formed interface metal/metal hydroxide heterojunction accelerates the electron transfer, and the electronic structure modulation by Cr incorporation improves the reaction kinetics. Benefiting from the synergy between structural and electronic modulation, the catalyst shows excellent activity toward water oxidation under alkaline conditions: overpotential of 200 mV at 10 mA/cm(2) current density and Tafel slope of 28 mV/dec. This work opens up a new window for understanding the structure-activity relationship of OER catalysts and encourages new strategies for development of more advanced OER catalysts.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2018
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-241005 (URN)10.1021/acsenergylett.8b01897 (DOI)000453805100003 ()2-s2.0-85056263175 (Scopus ID)
Note

QC 20190109

Available from: 2019-01-09 Created: 2019-01-09 Last updated: 2019-01-09Bibliographically approved
Chen, H., Gao, Y., Ye, L., Yao, Y., Chen, X., Wei, Y. & Sun, L. (2018). A Cu2Se-Cu2O film electrodeposited on titanium foil as a highly active and stable electrocatalyst for the oxygen evolution reaction. Chemical Communications, 54(39), 4979-4982
Open this publication in new window or tab >>A Cu2Se-Cu2O film electrodeposited on titanium foil as a highly active and stable electrocatalyst for the oxygen evolution reaction
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2018 (English)In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 54, no 39, p. 4979-4982Article in journal (Refereed) Published
Abstract [en]

Many nonprecious metal-selenide-based materials have been reported as electrocatalysts with high activity for the oxygen evolution reaction (OER). Herein, a hybrid catalyst film composed of Cu2Se and Cu2O nanoparticles directly grown on Ti foil (Cu2Se-Cu2O/TF) was prepared through a simple and fast cathodic electrodeposition method. Surprisingly, this electrode required a relatively low overpotential of 465 mV to achieve a catalytic current density of 10 mA cm-2 for the OER in 0.2 M carbonate buffer (pH = 11.0). Furthermore, a long-term constant current electrolysis test confirmed the high durability of the Cu2Se-Cu2O/TF anode at a current density of 10 mA cm-2 over 20 h. The XRD, TEM and XPS analysis of the sample after the OER indicated that a CuO protective layer formed on the surface of the Cu2Se-Cu2O catalyst, which effectively suppressed further oxidation of the Cu2Se-Cu2O catalyst during the OER and resulted in sustained catalytic oxidation of water.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2018
Keywords
buffer, carbonic acid, copper oxide, copper selenide, organoselenium derivative, oxygen, titanium, unclassified drug, water, Article, catalyst, chemical reaction, electrolysis, oxidation, pH, surface property, transmission electron microscopy, X ray diffraction, X ray photoemission spectroscopy
National Category
Other Chemistry Topics
Identifiers
urn:nbn:se:kth:diva-236423 (URN)10.1039/c8cc02021c (DOI)000435872900019 ()2-s2.0-85046835064 (Scopus ID)
Funder
Swedish Energy AgencySwedish Research Council
Note

QC 20181026

Available from: 2018-10-26 Created: 2018-10-26 Last updated: 2018-10-26Bibliographically approved
Ye, L., Gao, Y., Cao, S., Chen, H., Yao, Y., Hou, J. & Sun, L. (2018). Assembly of highly efficient photocatalytic CO2 conversion systems with ultrathin two-dimensional metal-organic framework nanosheets. Applied Catalysis B: Environmental, 227, 54-60
Open this publication in new window or tab >>Assembly of highly efficient photocatalytic CO2 conversion systems with ultrathin two-dimensional metal-organic framework nanosheets
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2018 (English)In: Applied Catalysis B: Environmental, ISSN 0926-3373, E-ISSN 1873-3883, Vol. 227, p. 54-60Article in journal (Refereed) Published
Abstract [en]

An ultrathin two-dimensional Zn porphyrin-based metal-organic framework (Zn-MOF nanosheets) is developed and used for the first time in photoreduction of CO2 to CO. Consequently, two novelty noble-metal-free hybrid photocatalytic systems are established and displayed outstanding photocatalytic activity and selectivity for CO evolution under mild photocatalytic reaction conditions. The insight revealed Zn-MOF nanosheets as photo sensitizer displays a better charge transport ability and longer lifetime of the photogenerated electron-hole pairs than the Zn-MOF bulk, which are confirmed by photoelectrochemical impedance and photoluminescence (PL) measurements. These studies show that the development of noble-metal-free photocatalytic systems and various MOF-based materials for photocatalytic applications are promising.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2018
Keywords
CO2 reduction, Photocatalysis, Metal-organic frameworks, Nanosheets, Zn porphyrin
National Category
Other Chemistry Topics
Identifiers
urn:nbn:se:kth:diva-226178 (URN)10.1016/j.apcatb.2018.01.028 (DOI)000428491000006 ()2-s2.0-85042913816 (Scopus ID)
Note

QC 20180516

Available from: 2018-05-16 Created: 2018-05-16 Last updated: 2018-05-16Bibliographically approved
Hou, J., Cao, S., Sun, Y., Wu, Y., Liang, F., Lin, Z. & Sun, L. (2018). Atomically Thin Mesoporous In2O3-x/In2S3 Lateral Heterostructures Enabling Robust Broadband-Light Photo-Electrochemical Water Splitting. Advanced Energy Materials, 8(9), Article ID 1701114.
Open this publication in new window or tab >>Atomically Thin Mesoporous In2O3-x/In2S3 Lateral Heterostructures Enabling Robust Broadband-Light Photo-Electrochemical Water Splitting
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2018 (English)In: Advanced Energy Materials, ISSN 1614-6832, Vol. 8, no 9, article id 1701114Article in journal (Refereed) Published
Abstract [en]

Atomically thin 2D heterostructures have opened new realms in electronic and optoelectronic devices. Herein, 2D lateral heterostructures of mesoporous In2O3-x/In2S3 atomic layers are synthesized through the in situ oxidation of In2S3 atomic layers by an oxygen plasma-induced strategy. Based on experimental observations and theoretical calculations, the prolonged charge carrier lifetime and increased electron density reveal the efficient photoexcited carrier transport and separation in the In2O3-x/In2S3 layers by interfacial bonding at the atomic level. As expected, the synergistic structural and electronic modulations of the In2O3-x/In2S3 layers generate a photocurrent of 1.28 mA cm(-2) at 1.23 V versus a reversible hydrogen electrode, nearly 21 and 79 times higher than those of the In2S3 atomic layers and bulk counterpart, respectively. Due to the large surface area, abundant active sites, broadband-light harvesting ability, and effective charge transport pathways, the In2O3-x/In2S3 layers build efficient pathways for photoexcited charge in the 2D semiconductive channels, expediting charge transport and kinetic processes and enhancing the robust broadband-light photo-electrochemical water splitting performance. This work paves new avenues for the exploration and design of atomically thin 2D lateral heterostructures toward robust photo-electrochemical applications and solar energy utilization.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2018
Keywords
atomically thin layers, charge separation, In2O3-x/In2S3, lateral heterostructures, photo-electrochemical water splitting
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-226792 (URN)10.1002/aenm.201701114 (DOI)000429318400001 ()
Note

QC 20180521

Available from: 2018-05-21 Created: 2018-05-21 Last updated: 2018-05-21Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-4521-2870

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