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Nano Research 2024, 17(3): 1140-1150 https://doi.org/10.1007/s12274-023-5939-9
Research Article | Open Access | Issue | Published: 26 July 2023

Nitrogen incorporated oxygen vacancy enriched MnCo2Ox/BiVO4 photoanodes for efficient and stable photoelectrochemical water splitting

Show Author's Information Liangcheng Xu1,  Yingjuan Zhang1,  Boyan Liu1,  Xin Wang1,  Gangqiang Zhu2( ),  Lianzhou Wang3( ),  Songcan Wang1,4( ),  Wei Huang1( )
Frontiers Science Center for Flexible Electronics, Xi’an Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, 127 West Youyi Road, Xi’an 710072, China
School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710062, China
Nanomaterials Centre, Australian Institute for Bioengineering and Nanotechnology and School of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia
Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Sanhang Science & Technology Building, No. 45th, Gaoxin South 9th Road, Nanshan District, Shenzhen 518063, China
Keywords:
water splitting, oxygen evolution, cocatalysts, filling oxygen vacancies, bismuth vanadate (BiVO4)
Topics:
Hydrogen fuelsPhotocatalysis
Cite this article:
Xu L, Zhang Y, Liu B, et al. Nitrogen incorporated oxygen vacancy enriched MnCo2Ox/BiVO4 photoanodes for efficient and stable photoelectrochemical water splitting. Nano Research, 2024, 17(3): 1140-1150. https://doi.org/10.1007/s12274-023-5939-9
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Abstract Full text Electronic supplementary material About this article

Oxygen vacancies in oxygen evolution cocatalysts (OECs) can significantly improve the photoelectrochemical (PEC) water splitting performance of photoanodes. However, OECs with abundant oxygen vacancies have a poor stability when exposing to the highly-oxidizing photogenerated holes. Herein, we partly fill oxygen vacancies in a MnCo2Ox OEC with N atoms by a combined electrodeposition and sol-gel method, which dramatically improves both photocurrent density and stability of a BiVO4 photoanode. The optimized N filled oxygen vacancy-rich MnCo2Ox/BiVO4 photoanode (3 at.% of N) exhibits an outstanding photocurrent density of 6.5 mA·cm−2 at 1.23 VRHE under AM 1.5 G illumination (100 mW·cm−2), and an excellent stability of over 150 h. Systematic characterizations and theoretical calculations demonstrate that N atoms stabilize the defect structure and modulate the surface electron distribution, which significantly enhances the stability and further increases the photocurrent density. Meanwhile, other heteroatoms such as carbon, phosphorus, and sulfur are confirmed to have similar effects on improving PEC water splitting performance of photoanodes.


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About this article

Nitrogen incorporated oxygen vacancy enriched MnCo2Ox/BiVO4 photoanodes for efficient and stable photoelectrochemical water splitting

Show Author's information Liangcheng Xu1, Yingjuan Zhang1, Boyan Liu1, Xin Wang1, Gangqiang Zhu2( ), Lianzhou Wang3( ), Songcan Wang1,4( ), Wei Huang1( )
Frontiers Science Center for Flexible Electronics, Xi’an Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, 127 West Youyi Road, Xi’an 710072, China
School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710062, China
Nanomaterials Centre, Australian Institute for Bioengineering and Nanotechnology and School of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia
Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Sanhang Science & Technology Building, No. 45th, Gaoxin South 9th Road, Nanshan District, Shenzhen 518063, China

Abstract

Oxygen vacancies in oxygen evolution cocatalysts (OECs) can significantly improve the photoelectrochemical (PEC) water splitting performance of photoanodes. However, OECs with abundant oxygen vacancies have a poor stability when exposing to the highly-oxidizing photogenerated holes. Herein, we partly fill oxygen vacancies in a MnCo2Ox OEC with N atoms by a combined electrodeposition and sol-gel method, which dramatically improves both photocurrent density and stability of a BiVO4 photoanode. The optimized N filled oxygen vacancy-rich MnCo2Ox/BiVO4 photoanode (3 at.% of N) exhibits an outstanding photocurrent density of 6.5 mA·cm−2 at 1.23 VRHE under AM 1.5 G illumination (100 mW·cm−2), and an excellent stability of over 150 h. Systematic characterizations and theoretical calculations demonstrate that N atoms stabilize the defect structure and modulate the surface electron distribution, which significantly enhances the stability and further increases the photocurrent density. Meanwhile, other heteroatoms such as carbon, phosphorus, and sulfur are confirmed to have similar effects on improving PEC water splitting performance of photoanodes.

Keywords: water splitting, oxygen evolution, cocatalysts, filling oxygen vacancies, bismuth vanadate (BiVO4)

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Received: 14 May 2023
Revised: 14 June 2023
Accepted: 18 June 2023
Published: 26 July 2023
Issue date: March 2024

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© The Author(s) 2023

Acknowledgements

Acknowledgements

The authors would like to acknowledge the financial support from National Natural Science Foundation of China (No. 52002328), Shenzhen Science and Technology Program (No. JCYJ20220530161615035), the Practice and Innovation Funds for Graduate Students of Northwestern Polytechnical University (No. PF2023151), the Fundamental Research Funds for the Central Universities, and material characterizations from the Analytical & Testing Center of Northwestern Polytechnical University. L. Z. W. thanks the financial support of Australian Research Council through its Discovery Project (DP) and Laureate Fellowship.

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