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Sökning: (WFRF:(Banerjee Amitava)) > (2018) > Simultaneous enhanc...

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FältnamnIndikatorerMetadata
00005152naa a2200493 4500
001oai:DiVA.org:kth-235878
003SwePub
008181009s2018 | |||||||||||000 ||eng|
009oai:DiVA.org:uu-366730
0247 a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2358782 URI
0247 a https://doi.org/10.1039/c8ta05491f2 DOI
0247 a https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3667302 URI
040 a (SwePub)kthd (SwePub)uu
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Zhao, Xinu Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore.4 aut
2451 0a Simultaneous enhancement in charge separation and onset potential for water oxidation in a BiVO4 photoanode by W-Ti codoping
264 c 2018
264 1b Royal Society of Chemistry,c 2018
338 a print2 rdacarrier
500 a QC 20181009QC 20181017
520 a Efficient charge separation of photo-generated electrons and holes is critical to achieve high solar to hydrogen conversion efficiency in photoelectrochemical (PEC) water splitting. N-type doping is generally used to improve the conductivity by increasing the majority carrier density and enhance the charge separation in the photoanode. However, minority carrier transport is also very important in the process of charge separation, especially in materials that possess inadequate minority carrier mobility. Herein, we take a BiVO4 PEC water splitting cell as an example to demonstrate how to analyze the limiting factor and to formulate the corresponding solutions to improve the hole mobility. The benefits and problems caused by n-type doping (W-doping here) of BiVO4 are analyzed. Codoping with Ti further enhances the charge separation by improving the hole transport and leads to a cathodic shift of the photocurrent onset potential. A high charge separation efficiency (79% at 1.23 V-RHE) in a compact BiVO4 photoanode has been achieved without any nanostructure formation. Theoretical results show that W-Ti codoping has decreased the hole polaron hopping activation energy by 11.5% compared with mono-W doping, and this has resulted in a hole mobility increase by 29%. The calculated adsorption energy and reaction Gibbs free energies indicate that the Ti site is energetically more favorable for water splitting. Moreover, the Ti site possesses a lower overpotential in the W-Ti codoped sample compared with the mono-W doped sample. The current study indicates that in order to improve the solar energy conversion efficiency, there should be a balanced charge transport of both majority and minority charge carriers. This can be achieved by simply choosing appropriate codoping elements.
650 7a NATURVETENSKAPx Kemix Materialkemi0 (SwePub)104032 hsv//swe
650 7a NATURAL SCIENCESx Chemical Sciencesx Materials Chemistry0 (SwePub)104032 hsv//eng
650 7a NATURVETENSKAPx Kemix Fysikalisk kemi0 (SwePub)104022 hsv//swe
650 7a NATURAL SCIENCESx Chemical Sciencesx Physical Chemistry0 (SwePub)104022 hsv//eng
7001 a Hu, Junu Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore.;Northwest Univ, Sch Chem Engn, Xian 710069, Shaanxi, Peoples R China.4 aut
7001 a Wu, Bou Nanyang Technol Univ, Sch Phys & Math Sci, Singapore 637371, Singapore.4 aut
7001 a Banerjee, Amitavau Uppsala universitet,Materialteori4 aut0 (Swepub:uu)amiba787
7001 a Chakraborty, Sudipu Uppsala universitet,Materialteori4 aut0 (Swepub:uu)sudch599
7001 a Feng, Jianyongu Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore.4 aut
7001 a Zhao, Zongyanu Kunming Univ Sci & Technol, Fac Mat Sci & Engn, Kunming 650093, Yunnan, Peoples R China.4 aut
7001 a Chen, Shiu Nanyang Technol Univ, Sch Phys & Math Sci, Singapore 637371, Singapore.4 aut
7001 a Ahuja, Rajeevu Uppsala universitet,KTH,Tillämpad materialfysik,Uppsala Univ, Mat Theory Div, Dept Phys & Astron, S-75120 Uppsala, Sweden,Materialteori4 aut0 (Swepub:uu)rajeeva
7001 a Sum, Tze Chienu Nanyang Technol Univ, Sch Phys & Math Sci, Singapore 637371, Singapore.4 aut
7001 a Chen, Zhongu Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore.4 aut
7102 a Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore.b Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore.;Northwest Univ, Sch Chem Engn, Xian 710069, Shaanxi, Peoples R China.4 org
7730 t Journal of Materials Chemistry Ad : Royal Society of Chemistryg 6:35, s. 16965-16974q 6:35<16965-16974x 2050-7488x 2050-7496
8564 u https://dr.ntu.edu.sg/bitstream/10356/81164/1/Simultaneous%20enhancement%20in%20charge%20separation%20and%20onset%20potential%20for%20water%20oxidation.pdf
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-235878
8564 8u https://doi.org/10.1039/c8ta05491f
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-366730

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