Key Laboratory of Cluster Science, Ministry of Education of China; Beijing Key Laboratory of Photoelectric/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology , Beijing 100081, China.
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University , Xi'an 710072, People's Republic of China.
ACS Appl Mater Interfaces. 2017 Jul 26;9(29):24577-24583. doi: 10.1021/acsami.7b06030. Epub 2017 Jul 17.
The effective separation of photogenerated electrons and holes in photocatalysts is a prerequisite for efficient photocatalytic water splitting. CuInS (CIS) is a widely used light absorber that works properly in photovoltaics but only shows limited performance in solar-driven hydrogen evolution due to its intrinsically severe charge recombination. Here, we prepare hierarchical graphitic CN-supported CuInS (denoted as GsC) by an in situ growth of CIS directly on exfoliated thin graphitic CN nanosheets (g-CN NS) and demonstrate efficient separation of photoinduced charge carriers in the GsC by forming the Z-scheme system for the first time in CIS-catalyzed water splitting. Under visible light illumination, the GsC features an enhanced hydrogen evolution rate up to 1290 μmol g h, which is 3.3 and 6.1 times higher than that of g-CN NS and bare-CIS, respectively, thus setting a new performance benchmark for CIS-based water-splitting photocatalysts.
在光催化剂中，光生电子和空穴的有效分离是高效光催化水分解的前提条件。CuInS（CIS）是一种广泛应用的光吸收剂，它在光伏领域表现良好，但由于其固有的严重电荷复合，在太阳能驱动的制氢方面仅表现出有限的性能。在这里，我们通过在剥离的薄石墨相氮化碳纳米片（g-CN NS）上直接原位生长 CIS，制备了分级石墨化 CN 负载的 CuInS（记为 GsC），并首次在 CIS 催化的水分解中通过形成 Z 型体系证明了 GsC 中光生载流子的有效分离。在可见光照射下，GsC 的产氢速率高达 1290 μmol g h，分别是 g-CN NS 和裸 CIS 的 3.3 和 6.1 倍，因此为基于 CIS 的水分解光催化剂设定了新的性能基准。
