journal article·2018-08-27

Oriented Growth of Sc-Doped Ta3N5 Nanorod Photoanode Achieving Low-Onset-Potential for Photoelectrochemical Water Oxidation

Lang Pei, Bihu Lv, Shuangbao Wang, Zhentao Yu, Shicheng Yan, Ryu Abe, Zhigang Zou

ACS Applied Energy Materials· Volume 1· Issue 8
Publisher page

Abstract

Developing photoanodes that can split water with low (or even without) externally applied bias is a critical challenge for achieving efficient solar-driven photoelectrochemical water oxidation. Here, we proposed a flux-assisted oriented crystal growth route to minimize the drawbacks of Ta3N5 photoanode, including the following: (1) Crystallographic-oriented growth minimizes the negative effect of electronic structure anisotropy of the Ta3N5, facilitating the directional fast charge transfer in having lighter carrier effective mass of (b,c)-axes directions. (2) Reducing crystal defects suppressed surface recombination of carriers and released the surface Fermi level pinning effect. (3) Increment of oxygen-impurity electron donor by Sc doping improved the electrical conductivity, promoting the bulk charge separation and transfer. Specifically, the onset potential of Ta3N5 photoanode was dramatically negatively shifted to 0.4 VRHE, and thereby afforded a 0.82% half-cell solar-to-hydrogen efficiency.
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Research context

OpenAlex topics: Advanced Photocatalysis Techniques · Electronic and Structural Properties of Oxides · Quantum Dots Synthesis And Properties

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

Affiliations

Eco-materials and Renewable Energy Research Center (ERERC), Collaborative Innovation Center of Advanced Microstructures, College of Engineering and Applied Sciences, Nanjing University, No. 22 Hankou Road, Nanjing, Jiangsu 210093, P. R. China

Jiangsu Key Laboratory for Nano Technology, National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, No. 22 Hankou Road, Nanjing, Jiangsu 210093, P. R. China

Collaborative Innovation Center of Sustainable Energy Materials, Guangxi University, Nanning, Guangxi 530004, P. R. China

Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan

Funding

Ministry of Science and Technology of the People's Republic of China · Ministry of Education of the People's Republic of China · Natural Science Foundation of Jiangsu Province · China Postdoctoral Science Foundation · Nanjing University · National Natural Science Foundation of China

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