N-doped carbon nanocages: Bifunctional electrocatalysts for the oxygen reduction and evolution reactions

被引:0
作者
Nan Jia
Qiang Weng
Yaru Shi
Xinyan Shi
Xinbing Chen
Pei Chen
Zhongwei An
Yu Chen
机构
[1] Shaanxi Normal University,Key Laboratory of Applied Surface and Colloid Chemistry (MOE), School of Materials Science and Engineering
来源
Nano Research | 2018年 / 11卷
关键词
N-doped carbon nanocages; bifunctional electrocatalyst; oxygen reduction reaction; oxygen evolution reaction;
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中图分类号
学科分类号
摘要
Highly efficient metal-free, carbon-based, bi-functional electrocatalysts for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) have attracted increased attention for use in electrochemical energy conversion systems, owing to their low cost and high activity. In this work, N-doped carbon nanocages (N-CCs) with a porous self-supported architecture and high specific surface area are synthesized by a facile interfacial assembly synthetic route. The materials are comprehensively characterized by scanning electron microscopy, transmission electron microscopy, nitrogen adsorption–desorption experiments, X-ray diffraction, and X-ray photoelectron spectroscopy. Cyclic voltammetry, chronoamperometry, and linear sweep voltammetry demonstrate that the as-prepared N-CC could serve as an effective metal-free electrocatalyst with excellent catalytic activity, long-term operation durability, and excellent methanol tolerance for the ORR in alkaline media. In the presence of 3 mM methanol, the half wave potential of the N-CCs for the ORR is 190 mV; this is more positive than that of the commercial Pt/C electrocatalyst. Meanwhile, the N-CCs also show an OER activity comparable to that of the commercial Ru/C electrocatalyst, revealing their bifunctional property.
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页码:1905 / 1916
页数:11
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