Abstract The technology of photocatalytic hydrogen evolution (PHE) by water splitting is a clean and sustainable approach to solve energy crisis and environmental problem. Many efforts have been made to develop new materials for this technology. In the photocatalytic water splitting, the cocatalyst is pivotal in improving the photocatalytic ability of the main catalyst by transferring electrons and providing active sites of H+ reduction. Here we report a new bimetal phosophide cocatalyst of NiCoP. The NiCoP can significantly improve the ability and durability of PHE for water splitting. The PHE rate is maximized to 28412.6 μmol/g/h over a 8 wt.% NiCoP/CdS photocatalyst, which is 361 times of the 1 wt.‰ Pt/CdS (78.7 μmol/g/h) under the same water splitting condition. The apparent quantum yield in 100 h is about 36.8%. The long-time photolysis water reaction for 100 h with increasing photocatalytic activity exhibits that the NiCoP in CdS is highly stable in water spitting. We can control and improve the photocatalytic activity by regulating the Ni–Co ratio, which is an advantage relative to single-metal phosphides. The photo-induced charge transfer over NiCoP has been proved by photoluminescence and methyl viologen dication. It is indicated the non-noble-metal cocatalyst NiCoP can substitute noble metal to significantly enhance the PHE activity of photocatalysts.

中文翻译：

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NiCoP 的新型助催化剂显着增强了硫化镉的可见光光催化析氢

摘要 光催化分解水制氢（PHE）技术是解决能源危机和环境问题的一种清洁、可持续的方法。已经做出许多努力来开发用于该技术的新材料。在光催化分解水中，助催化剂通过传递电子和提供H+还原活性位点，在提高主催化剂的光催化能力方面发挥着关键作用。在这里，我们报告了一种新型的 NiCoP 的双金属磷化物助催化剂。NiCoP 可以显着提高 PHE 分解水的能力和耐久性。在 8 wt.% NiCoP/CdS 光催化剂上，PHE 速率最大化为 28412.6 μmol/g/h，是相同水分解条件下 1 wt.‰ Pt/CdS (78.7 μmol/g/h) 的 361 倍. 100 小时的表观量子产率约为 36.8%。随着光催化活性的增加，长时间光解水反应 100 小时表明，CdS 中的 NiCoP 在喷水方面非常稳定。我们可以通过调节 Ni-Co 比例来控制和提高光催化活性，这是相对于单金属磷化物的优势。NiCoP 上的光致电荷转移已通过光致发光和甲基紫精二化证明。表明非贵金属助催化剂NiCoP可以替代贵金属显着提高光催化剂的PHE活性。NiCoP 上的光诱导电荷转移已通过光致发光和甲基紫精二化证明。表明非贵金属助催化剂NiCoP可以替代贵金属显着提高光催化剂的PHE活性。NiCoP 上的光诱导电荷转移已通过光致发光和甲基紫精二化证明。表明非贵金属助催化剂NiCoP可以替代贵金属显着提高光催化剂的PHE活性。