相纯高熵尖晶石氧化物 (Ni,Fe,Mn,Cu,Zn)3O4 通过热等离子体：一种有前途的析氧反应电催化剂,ACS Applied Energy Materials

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相纯高熵尖晶石氧化物 (Ni,Fe,Mn,Cu,Zn)3O4 通过热等离子体：一种有前途的析氧反应电催化剂
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2023-05-18 , DOI: 10.1021/acsaem.3c00311
Pasupathi Amarnath ₁ , Ragunath Madhu _{2,

3} , Kandasamy Praveen ₄ , Sivakumar Govindarajan ₄ , Subrata Kundu ₃ , Yugeswaran Subramaniam ₁

Affiliation

高熵氧化物（HEO）最近成为电化学水分解的潜在候选材料，具有优异的活性和催化稳定性，可替代最先进的析氧反应（OER）催化剂。HEO 的主要特征是其独特的结构以及调节物理、化学和机械性能的能力。在调整这些特性时，它表现出高热稳定性、导电性和催化活性。在这项工作中，通过利用以 Ar 和 CO ₂作为主要等离子体形成气体的碳质热等离子体，单相 (NiFeMnCuZn) ₃ O ₄首次在12kW的放电功率下制备出高熵氧化物材料。合成后的粉末在不同温度（300、350 和 400 °C）下退火，并使用各种显微和光谱工具进行表征。动态光散射研究表明，合成后的粉末具有单相尖晶石结构，平均粒径约为 140 nm。对合成材料进行电催化水氧化反应研究。^{结果表明，在 350 °C 下退火的 HEO 在 1 M KOH 电解质中具有优异的 OER 催化活性，在 50 mA cm –2}的电流密度下具有 308 mV 的过电位和 54 mV dec –1 的^Tafel斜率。此外，操作数-不同电势下的 EIS 分析表明，在 350 °C 下退火的 HEO 对界面处的电荷转移动力学表现出较小的阻力。这项工作提供了对在能源相关应用中具有优异性能的相纯 HEO 电催化剂的快速合成的见解。

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Phase-Pure High-Entropy Spinel Oxide (Ni,Fe,Mn,Cu,Zn)3O4 via Thermal Plasma: A Promising Electrocatalyst for Oxygen Evolution Reaction

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.

更新日期：2023-05-18

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