催化作用
电催化剂
碳纳米管
材料科学
碳纤维
化学工程
可逆氢电极
无机化学
金属
氢
化学
纳米技术
电极
电化学
工作电极
有机化学
复合材料
冶金
物理化学
复合数
工程类
作者
Yanfei Pei,Haoqiang Song,Yuan Liu,Yaojia Cheng,Weidong Li,Yumei Chen,Yanping Fan,Baozhong Liu,Siyu Lu
标识
DOI:10.1016/j.jcis.2021.05.089
摘要
Cost-effective production of metal-free catalysts for the oxygen-reduction reaction (ORR), to supersede Pt-based catalysts, is challenging. Here, a three-dimensional nanocatalyst was prepared by compounding multi-wall carbon nanotubes (MWCNTs) with easily modified and doped carbon dots (CDs) as sources of B and N. The catalyst has high conductivity and a large specific surface area similar to the MWCNTs, allowing exposure of many CDs with rich edge active sites and enhancing electron transfer. The catalyst exhibits excellent ORR performance, with 0.92 V of Eonset vs reversible hydrogen electrode (RHE). The E1/2 value exhibits a reduction of 50 mV compared with that of Pt/C (0.85 V) with a limited current density of 5.95 mA cm−2. The enhanced catalytic performance is attributed to the synergy of pyridine N and BC3. This work describes a simple and economical strategy for metal-free catalysts, and promotes the development of such catalysts for metal-air batteries and fuel cells.
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