纳米笼
双功能
析氧
纳米技术
氧气
材料科学
兴奋剂
氧还原反应
电催化剂
化学工程
还原(数学)
过电位
碳纤维
化学
氧还原
塔菲尔方程
电化学
催化作用
电极
复合数
物理化学
有机化学
光电子学
几何学
复合材料
工程类
数学
作者
Nan Jia,Qiang Weng,Yaru Shi,Xinyan Shi,Xinbing Chen,Pei Chen,Zhongwei An,Yu Chen
出处
期刊:Nano Research
[Springer Nature]
日期:2018-03-19
卷期号:11 (4): 1905-1916
被引量:72
标识
DOI:10.1007/s12274-017-1808-8
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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