Monoclinic BiVO₄ (BiV) has been widely used as a photoanode for water oxidation, but rarely as a photocatalyst for organic oxidation due to slow reaction of O₂. In this work, BiV has been modified with poorly crystallized sFe and sNi, where sFe is FeOOH, and sNi is a mixture of Ni(OH)₂ and polysulfide. Under light, sFe/BiV and sNi/BiV in aqueous solution were more active than BiV, respectively, not only for phenol oxidation but also for O₂ reduction. Importantly, the rate of phenol oxidation obtained for sFe/sNi/BiV was larger than the sum of the rates measured for sFe/BiV and sNi/BiV, by a factor of approximately 1.5. Moreover, on a film electrode, O₂ reduction had a current of sFe/sNi/BiV > sNi/BiV > sFe/BiV > BiV, while water (photo)oxidation had a current of sFe/sNi/BiV > sNi/BiV > sFe/BiV > BiV. A possible mechanism is proposed, involving formation of a reduced sulfur species for O₂ reduction and an oxidized iron species for phenol oxidation. In sFe/sNi/BiV, there is a mutual promotion between the sNi-mediated electron transfer and the sFe-mediated hole transfer. This results in a further improved efficiency of charge separation for O₂ reduction and phenol oxidation.

单斜 BiVO ₄ (BiV) 已被广泛用作水氧化的光阳极，但由于 O ₂反应缓慢，很少用作有机氧化的光催化剂。在这项工作中，BiV 用结晶较差的 sFe 和 sNi 进行了改性，其中 sFe 是 FeOOH，而 sNi 是 Ni(OH) ₂和多硫化物的混合物。在光照下，水溶液中的 sFe/BiV 和 sNi/BiV 分别比 BiV 更活跃，不仅对苯酚氧化，而且对 O ₂还原也如此。重要的是，sFe/sNi/BiV 获得的苯酚氧化速率比 sFe/BiV 和 sNi/BiV 测得的速率之和大约 1.5 倍。此外，在薄膜电极上，O ₂还原的电流为 sFe/sNi/BiV > sNi/BiV > sFe/BiV > BiV，而水（光）氧化的电流为 sFe/sNi/BiV > sNi/BiV > sFe/BiV > BiV。提出了一种可能的机制，包括形成用于 O ₂还原的还原硫物质和用于苯酚氧化的氧化铁物质。在 sFe/sNi/BiV 中，sNi 介导的电子转移和 sFe 介导的空穴转移相互促进。这导致O ₂还原和苯酚氧化的电荷分离效率进一步提高。