材料科学
电化学
纳米颗粒
化学工程
微观结构
金属
质子交换膜燃料电池
氢
纳米技术
无机化学
燃料电池
物理化学
化学
冶金
有机化学
电极
工程类
作者
Jiahao Huang,Min Feng,Yang Peng,Churong Huang,Xin Yue,Shaoming Huang
出处
期刊:Small
[Wiley]
日期:2022-12-11
卷期号:19 (8)
被引量:7
标识
DOI:10.1002/smll.202206098
摘要
Design and development of low-cost and highly efficient non-precious metal electrocatalysts for hydrogen evolution reaction (HER) in an acidic medium are key issues to realize the commercialization of proton exchange membrane water electrolyzers. Ni is regarded as an ideal alternative to substitute Pt for HER based on the similar electronic structure and low price as well. However, low intrinsic activity and poor stability in acid restrict its practical applications. Herein, a new approach is reported to encapsulate Ni nanoparticles (NPs) into interlayer edges of N-doped Nb2 CTx MXene (Ni NPs@N-Nb2 CTx ) by an electrochemical process. The as-prepared Ni NPs@N-Nb2 CTx possesses Pt-like onset potentials and can reach 500 mA cm-2 at overpotentials of only 383 mV, which is much higher than that of N-Nb2 CTx supported Ni NPs synthesized by a wet-chemical method (w- Ni NPs/N-Nb2 CTx ). Furthermore, it shows high durability toward HER with a large current density of 300 mA cm-2 for 24 h because of the encapsulated structure against corrosion, oxidation as well as aggregation of Ni NPs in an acidic medium. Detailed structural characterization and density functional theory calculations reveal that the stronger interaction boosts the HER.
科研通智能强力驱动
Strongly Powered by AbleSci AI