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Simultaneous enhanc...
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Zhao, XinNanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore.
(författare)
Simultaneous enhancement in charge separation and onset potential for water oxidation in a BiVO4 photoanode by W-Ti codoping
- Artikel/kapitelEngelska2018
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2018
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Royal Society of Chemistry,2018
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printrdacarrier
Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:kth-235878
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-235878URI
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https://doi.org/10.1039/c8ta05491fDOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-366730URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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QC 20181009QC 20181017
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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.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Hu, JunNanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore.;Northwest Univ, Sch Chem Engn, Xian 710069, Shaanxi, Peoples R China.
(författare)
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Wu, BoNanyang Technol Univ, Sch Phys & Math Sci, Singapore 637371, Singapore.
(författare)
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Banerjee, AmitavaUppsala universitet,Materialteori(Swepub:uu)amiba787
(författare)
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Chakraborty, SudipUppsala universitet,Materialteori(Swepub:uu)sudch599
(författare)
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Feng, JianyongNanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore.
(författare)
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Zhao, ZongyanKunming Univ Sci & Technol, Fac Mat Sci & Engn, Kunming 650093, Yunnan, Peoples R China.
(författare)
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Chen, ShiNanyang Technol Univ, Sch Phys & Math Sci, Singapore 637371, Singapore.
(författare)
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Ahuja, RajeevUppsala universitet,KTH,Tillämpad materialfysik,Uppsala Univ, Mat Theory Div, Dept Phys & Astron, S-75120 Uppsala, Sweden,Materialteori(Swepub:uu)rajeeva
(författare)
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Sum, Tze ChienNanyang Technol Univ, Sch Phys & Math Sci, Singapore 637371, Singapore.
(författare)
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Chen, ZhongNanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore.
(författare)
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Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore.Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore.;Northwest Univ, Sch Chem Engn, Xian 710069, Shaanxi, Peoples R China.
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Journal of Materials Chemistry A: Royal Society of Chemistry6:35, s. 16965-169742050-74882050-7496
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Zhao, Xin
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Hu, Jun
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Wu, Bo
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Banerjee, Amitav ...
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Chakraborty, Sud ...
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Feng, Jianyong
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visa fler...
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Zhao, Zongyan
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Chen, Shi
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Ahuja, Rajeev
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Sum, Tze Chien
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Chen, Zhong
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visa färre...
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