文献类型：期刊文献

英文题名：Spontaneously Forming Oxide Layer of High Entropy Alloy Nanoparticles Deposited on Porous Carbons for Supercapacitors

作者：Shen, Enhui[1,2];Song, Xuehua[1,2];Chen, Qibin[1,2];Zheng, Mengmeng[1,2];Bian, Jianqing[1,2];Liu, Honglai[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, 130 Meilong Rd, Shanghai, Peoples R China

年份：2021

卷号：8

期号：1

起止页码：260

外文期刊名：CHEMELECTROCHEM

收录：;EI(收录号：20210309783522);WOS:【SCI-EXPANDED(收录号:WOS:000607645400033)】；

语种：英文

外文关键词：high-entropy alloys; porous carbon materials; supercapacitors; metal oxide layers; nanoparticles

摘要：High-entropy alloy nanoparticles with a thin metal oxide layer, deposited onto hypercrosslinked polymer-based carbon (HCPC), were synthesized through the adsorption of five metal ions in the hypercrosslinked polymers and subsequent in situ reduction of such ions (Fe2+, Co2+, Ni2+, Cu2+ and Sn2+), followed by a carbonization process. The as-prepared composites exhibit an excellent specific capacitance (495.4 F/g at 0.5 A/g in 1 M KOH), a superior cycling stability (94.7 % of initial capacitance after 15000 cycles at 10 A/g), and ultrafast charge transport kinetics (88.9 % fast kinetic capacitance at 200 mV/s). These excellent electrochemical behaviors are attributed to the pseudocapacitance of the metal oxide layer spontaneously formed on the outermost surface of the composite, having a thickness at the nanometer scale. Such findings suggest that this simple strategy, combining multimetallic nanoparticles with porous carbon materials, has promising potential to improve specific capacitance and paves the way to develop both the preparation of high-entropy alloys and supercapacitors with improved performance.