Peijia Wang, Xiaohang Zheng, Bin Qin, Liang Qiao, Wei Cai, Yaotian Yan
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引用次数: 0
Abstract
It is crucial to design economically active and stable electrocatalysts for hydrogen evolution reactions (HER). Herein, we present a novel and efficient Ar plasma-assisted strategy for the construction of octahedral Co-vacancy induced heteroatom Pt-filling and oxygen vacancy enriched dual-deficient Co3O4 spinel nanosheets arrays (D-Pt-Co3O4) to enhance HER performance. The Ar plasma technique can efficiently generate vacancies on the oxide surface. This induces the formation of Pt-filling and oxygen vacancy. Theoretical calculations show that the synergistic effect of filling Pt atoms with oxygen vacancies effectively improves the electronic conductivity and optimizes the energy barriers. Meanwhile, the Pt atoms and Co atoms (mainly octahedral Co sites) act as active sites, contributing to the improved performance. A low overpotential of 27 mV is required for the D-Pt-Co3O4 at 10 mA cm-2 in alkaline HER, outperforming that of the commercial Pt/C, and the turnover frequency under alkaline conditions is significantly improved. The present method highlights the concept of differential adsorption sites in vacancy-enhanced noble metal atom filling metal oxide catalysts for boosting hydrogen evolution.
设计经济高效、稳定的析氢电催化剂是析氢反应的关键。在此,我们提出了一种新颖有效的Ar等离子体辅助策略,用于构建八面体共空位诱导的杂原子pt填充和富氧空位双缺Co3O4尖晶石纳米片阵列(D-Pt-Co3O4),以提高HER性能。氩等离子体技术可以有效地在氧化物表面产生空位。这导致pt填充和氧空位的形成。理论计算表明,氧空位填充Pt原子的协同效应有效地提高了电子导电性,优化了能垒。同时,Pt原子和Co原子(主要是八面体Co位)作为活性位,有助于提高性能。在碱性HER条件下,D-Pt-Co3O4在10 mA cm-2下需要27 mV的低过电位,优于商用Pt/C,并且在碱性条件下的周转频率显著提高。本方法强调了空位增强贵金属原子填充金属氧化物催化剂中促进析氢的差异吸附位点的概念。
期刊介绍:
The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.