Effect of Facet‐Selective Assembly of Cocatalyst on BiVO4 Photoanode for Solar Water Oxidation,ChemCatChem

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Effect of Facet‐Selective Assembly of Cocatalyst on BiVO4 Photoanode for Solar Water Oxidation
ChemCatChem ( IF 3.8 ) Pub Date : 2019-05-15 , DOI: 10.1002/cctc.201900573
Deng Li _{1,

2} , Ruotian Chen _{1,

2} , Pengpeng Wang _{1,

2} , Zhen Li _{1,

2} , Jian Zhu ₁ , Fengtao Fan ₁ , Jingying Shi ₁ , Can Li ₁

Affiliation

Rational assembly of cocatalysts on crystal‐based photocatalysts with anisotropic facets, namely the reduction cocatalyst on the reduction facets and oxidation cocatalyst on the oxidation facets, can enhance the photocatalytic activity remarkably. However, this strategy of selective loading of cocatalysts on crystal‐facet engineered photoelectrodes is rarely discussed in photoelectrocatalysis (PEC). Herein, we fabricated BiVO₄ microcrystal photoanodes with simultaneous exposure of oxidation {110} and reduction {010} facets to study the effect of facet‐selective assembly of cocatalysts on the activity of PEC water oxidation. By elaborative photodeposition, identical cocatalysts of MnO_x were selectively loaded on the reduction, the oxidation and all the facets of BiVO₄ photoanodes (respectively designated as R‐BVO, O‐BVO and O/R‐BVO). We found that MnO_x facilitates the charge separation in BiVO₄ more significantly on the oxidation facets than on the reduction ones, contributing to the net increase in photocurrent of O‐BVO being as 5.2 and 2.2 times that of R‐BVO and O/R‐BVO, respectively. Surface photovoltage analysis reveals that the interaction between the inherent built‐in electric field in BiVO₄ crystals and the additive electric filed induced by the MnO_x was account for the difference. Our work emphasizes the effect of facet‐selective assembly of cocatalyst in PEC systems, which may guide the rational design of highly efficient photoelectrodes for solar energy conversion.

中文翻译：

助催化剂的分面选择性组装对BiVO4光阳极用于太阳能氧化的影响

在具有各向异性方面的基于晶体的光催化剂上合理地组装助催化剂，即在还原方面的还原助催化剂和在氧化方面的氧化助催化剂可以显着增强光催化活性。但是，在光电面催化（PEC）中很少讨论这种将助催化剂选择性负载在晶面工程光电极上的策略。在这里，我们制造了BiVO ₄微晶光阳极，同时暴露了氧化{110}和还原{010}面，以研究助催化剂的面选择性组装对PEC水氧化活性的影响。通过精细的光沉积，在还原，氧化和BiVO _4的所有方面选择性负载相同的MnO _x助催化剂光电阳极（分别称为R-BVO，O-BVO和O / R-BVO）。我们发现MnO _x在氧化方面比在还原方面更有利于BiVO _4中的电荷分离，从而使O-BVO的光电流净增加分别是R-BVO和O / R的5.2和2.2倍-BVO。表面光电压分析表明，BiVO ₄晶体固有的内置电场与MnO _x感应的加性电场之间的相互作用是造成这种差异的原因。我们的工作强调了助催化剂在PEC系统中按面选择性组装的作用，这可能指导合理设计用于太阳能转换的高效光电极。

更新日期：2019-05-15

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