塔菲尔方程
尖晶石
过电位
析氧
材料科学
电催化剂
氧化物
电解质
催化作用
分解水
化学工程
热稳定性
电化学
分析化学(期刊)
化学
电极
物理化学
冶金
光催化
工程类
生物化学
色谱法
作者
Pasupathi Amarnath,Ragunath Madhu,Kumar Praveen,Sivakumar Govindarajan,Subrata Kundu,S. Yugeswaran
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2023-05-18
卷期号:6 (11): 5899-5911
被引量:11
标识
DOI:10.1021/acsaem.3c00311
摘要
High-entropy oxide (HEO) has recently emerged as a potential candidate material for electrochemical water splitting, with excellent activity and catalytic stability, as an alternative to the state-of-the-art oxygen evolution reaction (OER) catalyst. The main characteristics of HEO are its unique structure and the ability to tune physical, chemical, and mechanical properties. On tuning these properties, it exhibits high thermal stability, electrical conductivity, and catalytic activity. In this work, by utilizing a carbonaceous thermal plasma with Ar and CO2 as the major plasma-forming gases, a single-phase (NiFeMnCuZn)3O4 high-entropy oxide material has been produced at a discharge power of 12 kW for the first time. The as-synthesized powder was annealed at various temperatures (300, 350, and 400 °C) and characterized using various microscopic and spectroscopic tools. The dynamic light scattering study showed that the as-synthesized powder had a single-phase spinel structure with an average particle size of ∼140 nm. The synthesized materials were subjected to electrocatalytic water oxidation reaction studies. The results show that HEO annealed at 350 °C has an excellent OER catalytic activity in 1 M KOH electrolyte, with an overpotential of 308 mV at a current density of 50 mA cm–2 and a Tafel slope of 54 mV dec–1. Further, Operando-EIS analysis at different potentials evidences that HEO annealed at 350 °C shows less resistance toward the charge-transfer kinetics at the interface. This work provides insight into the rapid synthesis of phase-pure HEO electrocatalysts with excellent performance in energy-related applications.
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