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Multifunctional Vanadium-doped Cobalt Oxide Layer on Silicon Photoanodes for Efficient and Stable Photoelectrochemical Water Oxidation

Abstract

Photoelectrochemical (PEC) water splitting is an attractive method to convert solar energy into chemical fuels. However, developing highly efficient photoanode of PEC cell to meet industrial requirements still remains a challenge. Herein, we effectively engineer the onset potential of the photoanode though doping of V into Co oxide film by a low-cost way of magnetron co-sputtering deposition on p+n junction Si cell (p+nSi/CoVO). The highest photocurrent density of p+nSi/CoVO is 29.15 mA/cm2 (at 1.23 V vs. reversible hydrogen electrode (RHE)). Moreover, a successful decrease of the onset potential by 40 mV to 1.00 V (at 1 mA/cm2) and 3.6-fold increase in incident photons to current conversion efficiency (IPCE) are achieved comparing to those of p+nSi/CoO. The p+n junction Si cell provides not only the photoexcited vacancies but also the photoproduced voltage of 608 mV. We find that the doped V atoms are multifunctional, which can decrease the charge transfer resistance of Co3O4 film, serve as Lewis acid to increase local pH value and facilitate the generation of oxo-bridged CoIV=O species to accelerate kinetics of oxygen evolution reaction (OER), therefore, can obviously decrease the onset potential of p+nSi/CoVO in OER. This work highlights a general approach to further improve the performance of OER catalysts by engineering active sites and local chemical environment through element doping.

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Publication details

The article was received on 04 Aug 2018, accepted on 02 Oct 2018 and first published on 03 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA07552B
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Multifunctional Vanadium-doped Cobalt Oxide Layer on Silicon Photoanodes for Efficient and Stable Photoelectrochemical Water Oxidation

    Z. Xing, H. Wu, L. Wu, X. Wang, H. Zhong, F. Li, J. Shi, D. Song, W. Xiao, C. Jiang and F. Ren, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA07552B

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