电催化剂
锡
催化作用
锑
化学工程
质子交换膜燃料电池
无机化学
析氧
电化学
材料科学
氧化锡
氧化物
电解
化学
纳米颗粒
纳米技术
电极
物理化学
有机化学
冶金
电解质
工程类
作者
Inayat Ali Khan,Per Morgen,Sašo Gyergyek,Raghunandan Sharma,Shuang Ma Andersen
标识
DOI:10.1016/j.apsusc.2023.158924
摘要
We use facile microwaves (MWs)-assisted polyol method to synthesize metallic Ir-nanoparticles (Ir-NPs) supported on antimony-doped tin oxide (ATO). Parameters such as Ir loading, reaction temperature and reaction time were optimized to achieve high electrocatalytic performance of oxygen evolution reaction (OER) activity and durability under the corrosive OER environment of acidic electrolyzers. Electrocatalysts with varying Ir loading between 10 and 40 wt% were synthesized at two different temperatures (140 °C and 160 °C) to compare morphology, Ir valence state, OER activity and stability. This analysis has revealed efficient electrocatalyst synthesis with a narrow size distribution and homogeneous dispersion over the support surface. An electron rich state of Ir, contributing to the electrocatalyst activity and stability, was achieved at the synthesis temperature of 160 °C. Among the as-synthesized electrocatalysts, one, named Ir/ATO.AT-40-160, has demonstrated high activity (449 ± 2.7 A gIr−1) and high AST stability (75.1% retained current), reaching respectively 1.5 and 2 times those of a state-of-the-art commercial electrocatalyst. The high catalytic activity and excellent stability can both be attributed to the depressed overoxidation of the active Ir due to the low valence state, appropriate composition, and highly dispersed Ir NPs over the support surface.
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