电催化剂
塔菲尔方程
催化作用
石墨烯
量子点
密度泛函理论
材料科学
氢
吉布斯自由能
化学工程
分解水
氧化物
制氢
吸附
氢燃料
纳米技术
化学
电极
电化学
物理化学
光催化
计算化学
热力学
有机化学
工程类
冶金
物理
作者
Jibo Jiang,Ran Sun,Xing Huang,Haishan Cong,Jie Hu,Wenxiu Xu,Mingjing Li,Yukai Chen,Yunyun Wang,Sheng Han,Hualin Lin
标识
DOI:10.1016/j.cej.2021.132634
摘要
Hydrogen energy has become one of the most potential sources for replacing fossil fuels due to its environmental friendliness and high energy conversion rate. Electrolyzed water is a hydrogen evolution process with high efficiency, no by-products, and high hydrogen purity. Here, we propose to use ZIF-67 as the precursor to prepare three-dimensional multilayer rGO supported CoS2 quantum dots (CoS2[email protected]) through a two-step hydrothermal method and one-step calcinations method. The as-prepared electrocatalyst with maximum exposure of edge active sites is highly efficient for hydrogen evolution reaction (HER), delivering an extremely small Tafel slope of 78 mV dec-1, and prominent durability. Density functional theory (DFT) calculations reveal that decoration of CoS2QDs not only obviously changes Gibbs free energy of hydrogen adsorption (ΔGH*), but also offers more active sites for HER, conspicuous promoting the catalytic activity of as-obtained electrode materials. It can be expected that our CoS2 quantum dots mounted on three-dimensional multilayer rGO with ZIF-67 as the precursor, will provide a novel, high-yield and effective catalytic material for energy conversion applications.
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