合金
化学工程
过电位
煅烧
金属
材料科学
纳米颗粒
析氧
溶解
拉曼光谱
氧气
化学
催化作用
纳米技术
物理化学
有机化学
冶金
工程类
物理
光学
电化学
电极
作者
Han Zhu,Zhenfeng Zhu,Jiace Hao,Shuhui Sun,Shuanglong Lu,Chan Wang,Piming Ma,Weifu Dong,Mingliang Du
标识
DOI:10.1016/j.cej.2021.133251
摘要
We reported a conceptual and experimental breakthrough in serving the nanoscale high-entropy alloy (HEA) as substrates to stabilize the active Ir with ultra-low loading by using Fe, Co, Ni and Ru as stabilizing structural elements. The ultra-small FeCoNiIrRu HEA nanoparticles were in situ synthesized in electrospun carbon nanofibers (CNFs), and it exhibited thermodynamic induced phase evolution, as revealed by in situ characterization. The FeCoNiIrRu/CNFs exhibit exciting oxygen evolution reaction (OER) activity with low overpotential of 241 mV at 10 mA cm−2 and high mass activity of 205 mA mg-1Ir+Ru. The hysteretic diffusion effect of HEA strongly inhibits the metal leaching and dissolution, leading to the excellent durability. The OER performance can be optimized by changing the metal compositions and calcination temperatures. In situ Raman spectra reveal the formation of OH and superoxo (OO) intermediates on HEA NP surfaces. Theoretically calculation indicate that the electron density redistribution in FeCoNiIrRu NPs occurs from low electronegative elements (Fe, Co, and Ni) to high electronegative ones (Ir, Ru) and it make the Ir more active to simultaneously promote the conversion of *OOH and generation of O2.
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