非阻塞I/O
石墨烯
材料科学
光催化
无定形固体
氧化物
化学工程
无定形碳
氧化镍
碳化物
纳米颗粒
催化作用
纳米技术
化学
冶金
有机化学
工程类
作者
Weiying Zhang,Ze Li,Hong Li,Weiting Li,Shaoqin Peng,Yuexiang Li
出处
期刊:Energy & Fuels
[American Chemical Society]
日期:2022-11-29
卷期号:36 (24): 15112-15119
被引量:4
标识
DOI:10.1021/acs.energyfuels.2c03256
摘要
It is still a challenge to develop efficient catalysts for hydrogen evolution reaction (HER) via a low-cost and simple method. Herein, we report an amorphous NiO/reduced graphene oxide (A-NG) composite as a cocatalyst for enhanced photocatalytic H2 evolution via dye sensitization. The A-NG composite is facilely fabricated by calcinating the NiCl2/GO precursor at a low temperature of 250 °C. The detailed characterizations show that amorphous NiO presents as tiny nanoparticles highly dispersed on graphene sheets, and nickel carbide is formed at the NiO/graphene interface, which demonstrates the strong interaction between Ni and the defective carbon of graphene. Compared with crystalline NiO/rGO (C-NG), the A-NG cocatalyst shows much enhanced dye-sensitized photocatalytic HER activity because the amorphous NiO nanoparticles can effectively adsorb the dye. As a result, highly dispersed amorphous NiO accelerates the photoinduced electron transfer from the excited dye to the cocatalyst, namely, the amorphous nickel carbide formed between NiO and rGO. This work provides a low-cost and simple method to develop efficient cocatalysts for photocatalytic H2 evolution.
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