期刊
NANO ENERGY
卷 32, 期 -, 页码 232-240出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2016.12.039
关键词
Photoelectrochemical water splitting; Photoanode; BiVO4; ZnO nanodendrite array; Fully-depleted heterojunction
类别
资金
- Headquarters of University Advancement at the National Cheng Kung University
- Ministry of Education, Taiwan
- Ministry of Science and Technology in Taiwan [MOST 103-2221-E-006-245MY3, MOST 105-2221-E-006-251-MY3]
To enhance photoelectrochemical water splitting performance of the intrinsic BiVO4, a low-potential driven fully-depleted intrinsic BiVO4-based photoanode is realized in this work by the conformal formation of thin BiVO4 layers (< 15 nm) on the 3-mu m-thick ZnO nanodendrite (ND) array followed by the deposition of cocatalyst cobalt phosphate (Co-Pi). The Co-Pi/BiVO4/ZnO ND photoanode is fully-depleted at 0.8 V vs. the reversible hydrogen electrode (RHE) by the electric fields developed in radial directions of the nanorods and branches. Driven by the electric fields, the photogenerated electron-hole pairs in the whole electrode are efficiently separated and then the holes swiftly drift to the photoanode/electrolyte interface for oxygen evolution. Rather than diffusion, charge transport mechanism is governed by drift in the fully-depleted ND heterojunction array photoanode. As a result, in the high-light-harvesting BiVO4/ZnO ND array photoanode, the obstacle of slow charge transport in BiVO4 can be surmounted due to the construction of the light absorption and hole drifting paths in different directions. The photocurrent density of the Co-Pi/BiVO4/ZnO ND photoanode is optimized to be 3.5 mA cm(-2) at 1.23 V vs. RHE.
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