| 二元ZnCo-LDH助催化剂对BiVO4光电化学性能的促进 |
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| 引用本文： | 李娜,王慕恒,赵勇,姚瑞,刘光,李晋平.二元ZnCo-LDH助催化剂对BiVO4光电化学性能的促进[J].无机化学学报,2019,35(10):1773-1780. |
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| 作者姓名： | 李娜 王慕恒 赵勇 姚瑞 刘光 李晋平 |
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| 作者单位： | 太原理工大学气体能源高效清洁利用山西省重点实验室 |
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| 基金项目： | 国家自然科学基金（No.21878204）资助项目。 |
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| 摘 要： | 钒酸铋(BiVO_4)是最有前景的将太阳能转化为氢能(STH)的光阳极材料之一,但其本身严重的电子-空穴复合严重影响了其实用性。本文中,我们报道了用一步电沉积法将高效的二元ZnCo-LDH助催化剂沉积在钒酸铋(BiVO_4)光阳极上,大大提升了钒酸铋(Bi VO4)的光吸收能力,并且加速了水氧化反应动力学,显著促进了光生空穴向半导体表面的转移,减轻了表面电荷复合。BiVO_4/ZnCo-LDH光阳极在1.23 V(vs RHE)偏压下,0.5 mol·L-1磷酸钾(KPi)电解液中的光电流密度达到2.85 mA·cm~(-2),是纯BiVO_4的2.59倍,且起始电位(Von)从930 m V下降到270 m V。BiVO_4/ZnCo-LDH复合光阳极表现出65%的高表面电荷分离效率(1.23 V(vs RHE)),而纯BiVO_4的仅为30%。
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| 关 键 词： | 钒酸铋 光电化学性能 ZnCo-LDH助催化剂 电荷分离 |
| 收稿时间： | 2019/5/26 0:00:00 |
| 修稿时间： | 2019/8/30 0:00:00 |
Promotion of Photoelectrochemical Performance of BiVO4 by Binary ZnCo-LDH Co-catalyst |
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| LI N,WANG Mu-Heng,ZHAO Yong,YAO Rui,LIU Guang and LI Jin-Ping.Promotion of Photoelectrochemical Performance of BiVO4 by Binary ZnCo-LDH Co-catalyst[J].Chinese Journal of Inorganic Chemistry,2019,35(10):1773-1780. |
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| Authors: | LI N WANG Mu-Heng ZHAO Yong YAO Rui LIU Guang and LI Jin-Ping |
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| Institution: | Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Tianyuan University of Technology, Taiyuan 030024, China,Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Tianyuan University of Technology, Taiyuan 030024, China,Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Tianyuan University of Technology, Taiyuan 030024, China,Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Tianyuan University of Technology, Taiyuan 030024, China,Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Tianyuan University of Technology, Taiyuan 030024, China and Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Tianyuan University of Technology, Taiyuan 030024, China |
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| Abstract: | Bismuth vanadate (BiVO4) is one of the most promising photoanode materials for converting solar energy into hydrogen energy (STH). However, the practical application of BiVO4 is severely hindered by the intrinsically severe electron-hole recombination. Here, we reported bismuth vanadate (BiVO4) photoanode decorated with binary zinc-cobalt LDHs (ZnCo-LDH) co-catalyst by one-step electrodeposition method, which greatly enhances light absorption capacities of bismuth vanadate (BiVO4), accelerates water oxidation kinetics, facilitates efficient hole transfer to the surface and reduces the surface charge recombination. The hybrid photoanode exhibited a high photocurrent density of 2.85 mA·cm-2 at 1.23 V(vs RHE), which corresponds to a 259% increase compared to that of the pristine BiVO4 photoanode. Furthermore, the onset potential (Von) has greatly decreased from 930 to 270 mV, which displays that OER kinetics is improved upon the deposition of ZnCo-LDH. In addition, the BiVO4/ZnCo-LDH composite photoanode showed a high surface charge separation efficiency of 65%, which is 2.17 times that of BiVO4. |
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| Keywords: | bismuth vanadate photoelectrochemical (PEC) properties zinc-cobalt LDH co-catalyst charge separation |
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