Boosting the solar water oxidation performance of a BiVO4 photoanode by crystallographic orientation control

被引:362
作者
Han, Hyun Soo [1 ]
Shin, Sun [2 ]
Kim, Dong Hoe [2 ]
Park, Ik Jae [2 ]
Kim, Ju Seong [2 ]
Huang, Po-Shun [3 ]
Lee, Jung-Kun [3 ]
Cho, In Sun [4 ]
Zheng, Xiaolin [1 ]
机构
[1] Stanford Univ, Dept Mech Engn, Stanford, CA 94305 USA
[2] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul, South Korea
[3] Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15261 USA
[4] Ajou Univ, Dept Mat Sci & Engn & Energy Syst Res, Suwon 16499, South Korea
基金
新加坡国家研究基金会;
关键词
BISMUTH VANADATE PHOTOANODES; PHOTOELECTROCHEMICAL HYDROGEN-PRODUCTION; OXYGEN EVOLUTION; ARTIFICIAL PHOTOSYNTHESIS; CHARGE SEPARATION; EFFICIENT; ABSORPTION; DEPOSITION; MECHANISM; TRANSPORT;
D O I
10.1039/c8ee00125a
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Materials with low crystal symmetry often exhibit anisotropic properties, allowing the tuning of their physical and chemical properties via crystallographic orientation and exposed facet control. Herein, for the first time, we have demonstrated that pristine BiVO4 with a preferred [001] growth orientation and exposed (001) facets exhibits excellent intrinsic charge transport properties and surface reactivity. Using preferentially [001]-oriented BiVO4 (p-BVO) as a photoanode for photoelectrochemical water splitting, an impressive photocurrent density at 1.23 V vs. the reversible hydrogen electrode (RHE) is achieved, which is approximately 16 times higher than that exhibited by a photoanode based on randomly oriented BiVO4. Importantly, when the surface of p-BVO is further roughened and decorated with an oxygen evolution electrocatalyst, photocurrent densities of approximate to 3.5 and approximate to 6.1 mA cm(-2) are achieved at 0.6 and 1.23 V-RHE, respectively; the latter value corresponds to approximate to 82% of the theoretically achievable photocurrent density for BiVO4 under 1 sun illumination. Our results demonstrate the effectiveness of crystal orientation and exposed facet control in optimizing materials for solar water-splitting applications.
引用
收藏
页码:1299 / 1306
页数:8
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