BiVO4 photoanode decorated with cobalt-manganese layered double hydroxides for enhanced photoelectrochemical water oxidation
BiVO4 photoanode decorated with cobalt-manganese layered double hydroxides for enhanced photoelectrochemical water oxidation
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钴锰层状双氢氧化物修饰的 BiVO4 光阳极增强光电化学水氧化
DOI：
10.1016/j.ijhydene.2020.08.224
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发表时间：
2020-11
影响因子：
7.2
通讯作者：
Li Jinping
中科院分区：
文献类型：
--
作者：
Zhao Fei;Li Na;Wu Yun;Wen Xiaojiang;Zhao Qiang;Liu Guang;Li Jinping
钒酸铋（BiVO 4）被广泛认为是用于光电化学（PEC）水裂解的主要n型半导体材料。然而，利用BiVO 4光阳极实现高效PEC水氧化过程仍面临着严重的挑战，如严重的电子-空穴复合。在这种情况下，通过简单的电沉积过程在BiVO 4表面修饰三维CoMn-layered double hydroxide（CoMn-LDH）纳米片来增强BiVO 4光阳极的PEC活性。结果表明，CoMn-LDH对PEC水氧化反应具有协同增宽内光吸收的作用，加速了空穴载流子向电解质的注入，减轻了电子-空穴复合，加快了PEC水氧化反应动力学。因此，BiVO 4/CoMn-LDH光阳极的光电流密度在1.23 VRHE下达到2.69 mA cm− 2，比原始BiVO 4高2.45倍。起始电位发生220 mV的负移，进一步降低至0.31 VRHE。大大增强的PEC性能也优先于Co和Mn单亲属。这项工作表明，协同BiVO 4/CoMn-LDH作为一个有能力的候选材料，可以用于有效的PEC水裂解。
Bismuth vanadate (BiVO4) is being widely identified as a leading n-type semiconductor material for photoelectrochemical (PEC) water splitting. Nevertheless, achieving efficient PEC water oxidation process through BiVO4photoanode still faces serious challenge such as severe electron-hole recombination. In this case, PEC activity of BiVO4photoanode was enhanced by decoration of three-dimensional CoMn-layered double hydroxide (CoMn-LDH) nanoflakes on the BiVO4surface via a facile electrodeposition process. It was suggested that CoMn-LDH played a synergistic effect on broadening internal light absorption, which accelerated injection of holes carrier to electrolyte and alleviated the electron-hole recombination, resulting in expediting faster PEC water oxidation reaction kinetics. Consequently, the photocurrent density of BiVO4/CoMn-LDH photoanode achieved 2.69 mA cm−2at 1.23 VRHE, 2.45 times higher than the pristine BiVO4. What's more, 220 mV negative-shift took place on onset potential that was further decreased to 0.31 VRHE. The vastly enhanced PEC performance was also prioritized to those of Co and Mn single relatives. This work demonstrated that the synergistic BiVO4/CoMn-LDH as a capable candidate material, can be utilized for effective PEC water splitting.
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DOI：
10.1039/c8ta12012a
发表时间：
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期刊：
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影响因子：
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