Abstract
Solar-assisted water splitting with bismuth vanadate (BiVO4) photoanodes has progressed significantly with many efforts devoted to improving charge separation and surface charge injection through synthetic methods, including dopants and catalytic layers. In contrast, postsynthetic treatments occur after the synthesis of electrodes. Recently, such postsynthetic treatments based upon illumination, chemistry, electrochemistry, or combinations thereof have led to dramatic improvements in the performance and efficiency of BiVO4 photoanodes. This Perspective summarizes recent BiVO4 postsynthetic treatments with mechanistic details and highlights important future directions. One broad challenge is that multiple interpretations of defect changes may be consistent with routine X-ray photoelectron spectroscopy data. Further experiments are suggested to better differentiate between the proposed defect changes. Also, performance changes are considered separately with respect to charge separation and charge injection ...
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