过电位
塔菲尔方程
催化作用
材料科学
纳米片
纳米颗粒
化学工程
选择性
无机化学
纳米技术
电化学
物理化学
有机化学
化学
电极
工程类
作者
Xiuzhen Wu,Zeming Wang,Keng Chen,Zhengyuan Li,Bingjie Hu,Liang Wang,Minghong Wu
标识
DOI:10.1021/acsami.1c03350
摘要
Pt-based catalysts are commercial electrocatalysts for the hydrogen evolution reaction (HER), but their shortcomings of expensive and imperfect efficiency hinder their large-scale application. Here, we report an Ir-based HER catalyst supported by N-doped carbon nanosheets (Ir-NCNSs). The NCNSs, with a high surface area and unique atomic composition, enable Ir nanoparticles (NPs) to disperse at 2–3 nm and strongly coordinate to the Ir through Ir–N bonds, which exposes many active sites and strengthens their durability. The catalyst displays a low overpotential and a small Tafel slope of 46.3 mV at 10 mA cm–2 and 52 mV dec–1 in 0.5 M H2SO4, respectively. When used in 1.0 M KOH, Ir-NCNSs also show excellent electrocatalytic activity with a low overpotential of 125 mV at 10 mA cm–2. The calculated results further suggest that Ir NPs and NCNSs have excellent selectivity for strong metal–support interactions, corresponding to a significant and stable HER characteristic. Our findings provide insight into the design of high-efficiency Ir-based HER catalysts.
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