MXenes公司
塔菲尔方程
材料科学
聚合
密度泛函理论
金属
催化作用
碳化物
化学工程
复合材料
纳米技术
化学
物理化学
电极
电化学
计算化学
有机化学
冶金
聚合物
工程类
作者
Dangcheng Su,Yuanhua Xiao,Yingliang Liu,Shengang Xu,Shaoming Fang,Shaokui Cao,Xuezhao Wang
出处
期刊:Carbon
[Elsevier]
日期:2023-01-01
卷期号:201: 269-277
被引量:30
标识
DOI:10.1016/j.carbon.2022.09.007
摘要
2D MXenes (transition metal carbides, Ti3C2Tx) with large surface area and metallic conductivity are widely used as supporters in catalysts. Unfortunately, the single MXene sheets would deteriorate in the presence of oxygen and water, which is almost the same as the environment of oxygen reduction reaction (ORR). Herein, an “armor” was constructed to encapsulate the oxidizable MXene by a confined in-situ oxidative polymerization strategy, employing the electrostatic interaction between the exfoliated MXene sheets (negatively charged) and oxidant (Fe3+, positively charged). The ultra-dispersed binary Fe3N and Co sits coupled with the large surface area MXene supporter synergy to endow more exposed active sites, meanwhile, the density functional theory (DFT) studies reveal that a moderate binding strength between the intermediates and the binary active sites was effectively modulated to enhance the ORR performance. The synthesized Fe3N/Co–N–[email protected] exhibits an impressive half-wave potential (E1/2, 0.871V) and a lower Tafel slope of 52.56 mV dec−1 than that of Pt–C-20% (74.89 mV dec−1). The Fe3N/Co–N–[email protected] based ZAB exhibits a four times higher peak power density (189.16 mW cm−2) than the Pt–C-20% based ZABs and superior cycle stability within 320 h. Furthermore, the assembled flexible ZABs shows high flexibility and stability in different bending scenarios.
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