Nano high-entropy oxide cathode with enhanced stability for direct borohydride fuel cells  

作　　者：Lei Zhang Lingfeng Kuang Lianke Zhang Wen Chu Haiying Qin Jing Zhang Junjing He Hualiang Ni Hongzhong Chi 

机构地区：[1]New Energy Materials Research Center,College of Materials and Environmental Engineering,Hangzhou Dianzi University,Hangzhou 310018,Zhejiang,China [2]School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,Zhejiang,China [3]Key Laboratory of MEMS of Ministry of Education,School of Integrated Circuits,Southeast University,Nanjing 210096,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2025年第1期309-316,共8页能源化学(英文版)

基　　金：Zhejiang Provincial Natural Science Foundation of China (LZ22B060001,LY22E010003);“Pioneer” R&D Program of Zhejiang Province(2023C01080);National Natural Science Foundation of China (52301235)。

摘　　要：High-entropy materials have become high-activity electrocatalysis owing to their high-entropy effect and multiple active sites.Herein,we synthesize a series of carbon-supported nano high-entropy oxides(HEOs/C),specifically (PtFeCoNiCu)O/C,using a carbothermal shock (CTS) method for application as a cathode catalyst in direct borohydride fuel cells (DBFCs).The microstructure of the prepared catalysts was characterized by X-ray photoelectron spectroscopy,X-ray absorption fine structure,and transmission electron microscopy.The prepared (PtFeCoNiCu)O/C,with particle sizes ranging from 2 to 4 nm,demonstrates 3.94 transferred electrons towards the oxygen reduction reaction in an alkaline environment,resulting in a minimal H_(2)O_(2)yield of 2.6%.Additionally,it exhibits a Tafel slope of 61 mV dec-1,surpassing that of commercial Pt/C (82 mV dec-1).Furthermore,after 40,000 cycles of cyclic voltammetry(CV) testing,the half-wave potential of (PtFeCoNiCu)O/C shows a positive shift of 3 mV,with no notable decline in the limiting current density.When (PtFeCoNiCu)O/C is used as a cathode catalyst in DBFCs,the DBFC achieves a maximum power density of 441 mW cm^(-2)at 60°C and sustains a cell voltage of approximately 0.73 V after 52 h at 30°C.These findings confirm that HEO/C is a promising cathode catalyst for DBFCs.

关 键 词：High-entropy oxides Oxygen reduction reaction Carbothermal shock STABILITY Direct borohydride fuel cells 

分 类 号：O64[理学—物理化学]