A Macroporous-Structured WO3/Mo-Doped BiVO4 Photoanode for Vapor-Fed Water Splitting under Visible Light Irradiation
A Macroporous-Structured WO3/Mo-Doped BiVO4 Photoanode for Vapor-Fed Water Splitting under Visible Light Irradiation
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DOI：
10.1021/acssuschemeng.0c02331
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发表时间：
2020-06-29
影响因子：
8.4
通讯作者：
Amano, Fumiaki
中科院分区：
文献类型：
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作者：
Chau Xuan Minh Ta;Akamoto, Chiho;Amano, Fumiaki
钒酸铋（BiVO 4）是一种很有前途的可见光诱导光电化学（PEC）水裂解材料。阳离子掺杂和与三氧化钨形成异质结的策略通过抑制光生电子和空穴的复合来提高BiVO 4光阳极的效率。在这项研究中，我们提出了一个简单的浸涂法制备WO 3/BiVO 4异质结的钛微纤维毡。钛毡的气体扩散结构适用于使用质子交换膜（PEM）的水的蒸气供给光电解。钼被用作掺杂剂以增强BiVO 4层的PEC性能。在可见光照射下，WO 3底层和Mo掺杂的组合效应显著提高了大孔结构光阳极的PEC性能。Ti/WO 3/Mo掺杂BiVO 4的入射光-电流转换效率（IPCE）在454-nm蓝光照射下达到10.7%，在1.2 V时相对于可逆氢电极。Nafion离聚物薄膜的涂层显着提高了大孔光阳极的光电流响应在蒸汽进料条件下。H2-和O2-的测量表明，离子聚合物涂层的Ti/WO 3/Mo掺杂的BiVO 4光阳极有利于PEM-PEC系统中的蒸汽进料水裂解。
Bismuth vanadate (BiVO4) is a promising material for visible-light-induced photoelectrochemical (PEC) water splitting. The strategies of cation doping and formation of heterojunctions with tungsten trioxide have improved the efficiency of BiVO4 photoanodes by suppressing the recombination of photogenerated electrons and holes. In this study, we present a simple dip-coating method to prepare WO3/BiVO4 heterojunctions on titanium microfiber felt. The gas diffusion structure of Ti felt is suitable for a vapor-fed photoelectrolysis of water using a proton exchange membrane (PEM). Molybdenum is utilized as a dopant to enhance the PEC performance of the BiVO4 layer. The combined effect of the WO3 underlayer and the Mo doping significantly improved the PEC performance of the macroporous-structured photoanode under visible light irradiation. The incident photon-to-current conversion efficiency (IPCE) of Ti/WO3/Mo-doped BiVO4 reached 10.7% under 454-nm blue light irradiation at 1.2 V versus the reversible hydrogen electrode. The coating of Nafion ionomer thin films significantly enhanced the photocurrent response of the macroporous photoanode in the vapor-fed condition. The measurement of the H-2 and O-2 evolution indicates that the ionomer-coated Ti/WO3/Mo-doped BiVO4 photoanode is beneficial for the vapor-fed water splitting in the PEM-PEC system.