DataVXACS Applied Energy MaterialsPaper
journal article·2018-09-24

Mechanism Investigation of the Postnecking Treatment to WO3 Photoelectrodes

Dapeng Cao, Jie Wang, Jingbo Zhang, Shuaishuai Liu, Futing Xu, Song Xu, Xin Xu, Baoxiu Mi, Zhiqiang Gao

ACS Applied Energy Materials· Volume 1· Issue 9
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Source abstract

Abstract

Nanoporous WO3 photoanodes are prepared by an electrophoretic deposition method. Postnecking treatment of the WO3 photoanodes by dropping ammonium metatungstate solution following annealing remarkably improves the photocurrent of photoelectrochemcial (PEC) water oxidation. Water oxidation photocurrent density is promoted by a factor of 16 at 1.23 VRHE. To disclose the mechanism for the improvement, corresponding samples are prepared and investigated by scanning electron microscopy, electrochemical impedance spectroscopy, and PEC measurement both in Na2SO4 and Na2SO3 electrolyte. It is found that the significantly increased photocurrent is mainly due to improved electron transport rather than suppressed back-reaction at the FTO surface, passivating surface states, or other reasons. With introduction of a compact layer by pretreating FTO with ammonium metatungstate, the photocurrent of the necking-treated WO3 photoanode can be further improved, via suppressing the back-reaction at FTO surface. Both strategies of improving charge transport and suppressing the back-reaction at the FTO surface can offer a reference to enhance the photocurrent for other porous photoelectrodes.
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Research context

Energy storageNanomaterialsMaterials processing

OpenAlex topics: Advanced Photocatalysis Techniques · Copper-based nanomaterials and applications · Gas Sensing Nanomaterials and Sensors

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory for Organic Electronics & Information Displays (KLOEID), Jiangsu Engineering Centre for Plate Displays & Solid State Lighting, and Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, Nanjing, Jiangsu 210023, China

Key Laboratory of Flexible Electronics, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), School of Material Science and Engineering, Nanjing University of Posts & Telecommunications, Nanjing, Jiangsu 210023, China

Funding

Ministry of Science and Technology of the People's Republic of China · Natural Science Foundation of Jiangsu Province · Nanjing University of Posts and Telecommunications · National Natural Science Foundation of China · National Synergetic Innovation Center for Advanced Materials, Nanjing University of Posts and Telecommunications · Synergistic Innovation Center for Organic Electronics and Information Displays, Nanjing University of Posts and Telecommunications · Priority Academic Program Development of Jiangsu Higher Education Institutions

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