NiS and graphene as dual cocatalysts for the enhanced photocatalytic H2 production activity of g-C3N4
NiS and graphene as dual cocatalysts for the enhanced photocatalytic H2 production activity of g-C3N4
复制标题
NiS和石墨烯作为双助催化剂增强g-C3N4光催化H-2生产活性
DOI：
10.1016/j.apsusc.2018.10.241
复制
发表时间：
2019-03-01
影响因子：
6.7
通讯作者：
Zhu, Bicheng
中科院分区：
文献类型：
--
作者：
Chen, Zhe;Yang, Shuibin;Zhu, Bicheng
目前，如何合理设计和简便合成高活性、低成本的光催化剂仍然是一个巨大的挑战。采用一步水热法制备了无贵金属的石墨烯和NiS共修饰的g-C3 N4复合光催化剂。该三元复合物具有较高的光催化分解水活性。当RGO和NiS的重量比分别为0.25%和3%时，获得了最高的H-2放出速率，其是本体g-C3 N4的21.8倍。NiS和RGO双助催化剂的引入促进了光生电子-空穴对的分离，提高了g-C3 N4的光吸收，从而提高了光催化活性。该工作为无贵金属助催化剂改性光催化材料实现高效光催化分解水制氢提供了重要指导。
Up to now, rational design and facile synthesis of photocatalysts with high activity and low cost remain a great challenge. Here, noble-metal-free graphene and NiS co-modified g-C3N4 composite photocatalyst was prepared using an one-step hydrothermal method. The ternary composite displayed enhanced photocatalytic water splitting activity. When the weight ratios of RGO and NiS were 0.25% and 3%, respectively, the highest H-2 evolution rate was achieved, which was 21.8-fold that of bulk g-C3N4. The introduction of NiS and RGO dual cocatalysts promoted the separation of photogenerated electron-hole pairs and improved the light absorption of g-C3N4, thus enhancing the photocatalytic activity. This work provides significant guidance for the modification of photocatalytic materials with noble-metal-free cocatalysts to realize high-efficient photocatalytic water splitting for hydrogen generation.