Fabrication of noble-metal-free CdSnanorods-carbon layer-cobalt phosphide multiple heterojunctions for efficient and robust photocatalyst hydrogen evolution under visible light irradiation
Fabrication of noble-metal-free CdSnanorods-carbon layer-cobalt phosphide multiple heterojunctions for efficient and robust photocatalyst hydrogen evolution under visible light irradiation
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制备不含贵金属的CdS纳米棒-碳层-磷化钴多重异质结，用于可见光照射下高效、稳健的光催化剂析氢
DOI：
10.1016/j.renene.2018.07.028
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发表时间：
2019
期刊：
影响因子：
8.7
通讯作者：
Wang Chao
中科院分区：
文献类型：
--
作者：
Wang Peifang;Wu Tengfei;Ao Yanhui;Wang Chao
光催化分解水作为一种清洁、可再生的能源转化过程引起了人们极大的兴趣。本研究首次制备了一种由CdS纳米棒、导电碳层和CoP纳米颗粒助催化剂组成的新型无贵金属多异质结光催化剂（CdS@C-CoP）。所制备的CdS@C-CoP复合材料在可见光照射下表现出优异的光催化性能和稳定性。对于最佳的CdS@C-CoP样品，平均析氢速率高达10089 μmol g−1h−1，几乎是纯CdS的6倍。提高光催化产氢速率可以归因于导电碳层和表面助催化剂CoP之间的协同效应，这导致了光激发载流子的有效分离和丰富的氢还原活性位。本论文提出了一种将薄碳层包覆和表面负载助催化剂两种表面改性方法相结合来设计具有高效制氢性能的复合光催化剂的新方法。
Photocatalytic water splitting has aroused great interest as a clean and renewable energy conversion process. In this study, we prepared a novel noble-metal-free multiple heterojunction photocatalyst (CdS@C-CoP) composed of CdS nanorods, conducting carbon layer and CoP nanoparticles cocatalyst for the first time. The obtained CdS@C-CoP composites exhibited excellent performance and stability under visible light irradiation when it was used as photocatalysts for hydrogen evolution. For the optimum CdS@C-CoP sample, an average hydrogen evolution rate reached up to 10089 μmol g−1h−1, nearly 6 fold as high as that of pure CdS. The enhanced photocatalytic hydrogen production rate can be ascribed to the synergistic effect between conductive carbon layer and surface cocatalyst CoP, which resulted in efficient separation of photoexcited charge carriers and abundant active sites for hydrogen reduction. This work presented a novel way to design composite photocatalyst with efficient hydrogen generation properties through combining two kinds of surface modification methods: thin carbon layer coating and surface cocatalysts loading.