Enhanced Electrocatalytic Hydrogen Evolution Activity in Single-Atom Pt-Decorated VS2 Nanosheets

贵金属 材料科学 铂金 过电位 纳米颗粒 催化作用 吸附 电化学 化学工程 纳米技术 化学 物理化学 电极 有机化学 工程类
作者
Jingting Zhu,Lejuan Cai,Xinmao Yin,Zhuo Wang,Linfei Zhang,Haibin Ma,Yuxuan Ke,Yonghua Du,Shibo Xi,Andrew T. S. Wee,Yang Chai,Wenjing Zhang
出处
期刊:ACS Nano [American Chemical Society]
卷期号:14 (5): 5600-5608 被引量:157
标识
DOI:10.1021/acsnano.9b10048
摘要

Enhancing catalytic activity by decorating noble metals in catalysts provides an opportunity for promoting the electrocatalytic hydrogen evolution reaction (HER) application. However, there are few systematic studies on regulating the structures of noble metals in catalytic materials and investigating their influence on HER. Herein, Pt catalysts with different structures including single atoms (SAs), clusters, and nanoparticles well-controllably anchored on VS2 nanosheets through a cost-effective optothermal method are reported, and their HER performance is studied. The most efficient Pt-decorated VS2 catalyst (with both Pt SAs and clusters) delivers an overpotential of 77 mV at 10 mA cm-2, close to that of Pt/C (48 mV). However, the optimal mass activity of Pt (normalizing to Pt content) is obtained from only SA Pt-decorated VS2 (i.e., 22.88 A mgPt-1 at 200 mV) and is 12 times greater than that of the Pt/C (1.87 A mgPt-1), attributed to the greatly enhanced Pt utilization. Additionally, the theoretical simulations reveal that Pt SA decoration makes the adsorption free energy of H* closer to the thermoneutral value and improves the charge-transfer kinetics, significantly enhancing HER activity. This work offers a pathway to prepare the desired catalyst based on synergy of Pt structures and VS2 and reveals the intrinsic mechanism for enhancing catalytic activity, which is important for HER applications.
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