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Crystal Reconstruction of Mo:BiVO_4: Improved Charge Transport for Efficient Solar Water Splitting

机译：Crystal Reconstruction of Mo:BiVO_4: Improved Charge Transport for Efficient Solar Water Splitting

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A multifaceted Mo:BiVO_4 (mf-BVO) photoanode is grown on F-doped-SnO2substrates via achemical bath deposition, and the crystal reconstructionprocess of mf-BVO is found to boost the charge transport efficiency significantlyfor photoelectrochemical (PEC) water splitting. The mf-BVO exhibitscolumnar grains with an uncommon (121) texture with high-index facets suchas (112), (020), (132), and (204). The texture and high-index facets facilitaterapid surface melting and grain fusion during thermal annealing, thus leadingto crystal reconstructed micron-sized BVO grains (cr-BVO). The cr-BVO hasa photocurrent density ≈50 times larger than that of mf-BVO. The reason isidentified as the significantly improved charge transport efficiency resultingfrom the dopant activation (increased carrier concentration) and bulky grains(fewer defects). Additionally, the cr-BVO exhibits improved photocorrosionresistance compared to the nanoparticle-based BVO. After coating the oxygenevolution catalyst, the photocurrent density of cr-BVO is further increasedto 4.4 mA cm~(?2) for water oxidation reaction at 1.23 V versus the reversiblehydrogen electrode, maintaining a high and stable faradaic efficiency of over88% for 24 h. These results demonstrate that crystal reconstruction is a facileand effective pathway to improve the charge transport efficiency, opening anew avenue for developing efficient photoelectrodes for PEC water splitting.

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