Facile synthesis of nanosized spinel high entropy oxide (FeCoNiCrMn)_(3)O_(4) for efficient oxygen evolution reaction  

作　　者：Bomin Feng Jun Chen Yifei Yang Mao Yang Hongbing Wang Changyin Zhong Xiaochong Zhao Yunxi Yao 

机构地区：[1]Institute of Materials,China Academy of Engineering Physics,Jiangyou,621908,China

出　　处：《Journal of Materiomics》2024年第4期919-927,共9页无机材料学学报（英文）

基　　金：The authors acknowledge support from the National Natural Science Foundation of China(NSFC)(Grant No.22109147 and 52371144);Institute of Materials,China Academy of Engineering Physics(No.TP01201701).

摘　　要：The sluggish reaction kinetics of oxygen evolution reaction(OER)and the high price of noble metal catalysts hinder the wide application of water electrolysis for hydrogen generation.High-entropy oxides(HEOs)with multi-components and high entropy stabilized structures have attracted great research interests due to their efficient and durable performance in electrolytic water splitting reactions.However,the development of efficient HEO electrocatalysts are often hindered by the limited surface exposed active sites because high temperature is usually required to form a high entropy stabilized structure.Herein,a flaky high-entropy oxide with a spinel structure,(FeCoNiCrMn)_(3)O_(4),was synthesized by using the sacrificial layered carbon template in situ prepared by the volatile reaction between ammonium sulfate and molten glucose.High-resolution TEM results show the as-prepared(FeCoNiCrMn)_(3)O_(4) flakes are composed of nanosized HEO particles.The nanosized(FeCoNiCrMn)_(3)O_(4) HEO electrocatalysts exhibit excellent OER activity,with an overpotential of 239 mV at 10 mA/cm^(2) and a Tafel slope of 52.4 mV/dec.The electrocatalyst has excellent stability.Even at a high current density of 100 mA/cm^(2),the activity remains unchanged during the stability test for 24 h.The results here shed a new light in the design and fabrication of highly efficient HEO electrocatalysts.

关 键 词：High entropy oxides Oxygen evolution reaction Spinel oxide Millard reaction ELECTROCATALYST 

分 类 号：O64[理学—物理化学]