Simultaneous Doping of Nitrogen and Fluorine into Carbon (NFC) as Metal-Free Oxygen Reduction Electrocatalysts
Simultaneous Doping of Nitrogen and Fluorine into Carbon (NFC) as Metal-Free Oxygen Reduction Electrocatalysts
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将氮和氟同时掺杂到碳中（NFC）作为无金属氧还原电催化剂
DOI：
10.1149/2.0901714jes
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发表时间：
2017-01-01
影响因子：
3.9
通讯作者：
Yang, Junhe
中科院分区：
文献类型：
--
作者：
Zhang, Hui-Juan;Zhang, Xu;Yang, Junhe
在这里，我们通过直接热解炭黑和氟化铵的混合物，简单地制备并优化了氮、氟共掺杂碳(NFC)作为无金属氧还原反应(ORR)电催化剂。电化学结果表明，热解温度对提高NFC对ORR的电催化性能起着至关重要的作用，在900℃时达到最大值，表现出最好的ORR峰电位、起始电位和半波电位。在-0.4V的盘势下，每个氧分子的转移电子数为3.92，四电子百分含量为96.3%，过氧化氢百分含量为3.74%。X射线衍射和拉曼光谱均表明，热解温度越高，NFC的缺陷性质越大。特别是NFC900具有较高的中孔比例，比表面积为1057m(2)/g，XPS表明N和F已经共掺杂到碳基质中，F主要以离子C-F键的形式存在。(三)2017年度电化学会。版权所有。
Here, we have simply prepared and optimized nitrogen, fluorine co-doped carbon (NFC) as metal-free oxygen reduction reaction (ORR) electrocatalyst from directly pyrolysing the mixture of carbon black and ammonium fluoride. Electrochemical results reveal that pyrolysis temperature plays an essential role on improving the electrocatalytic performance of NFC for the ORR and it reaches the maximum at 900 degrees C, exhibiting the best ORR electrocatalytic activity in terms of the ORR peak potential, onset potential, and half-wave potential. Furthermore, the number of electrons transferred per oxygen molecular is 3.92, the percentage of four-electron is 96.3% and the percentage of peroxide is 3.74% at the disk potential of -0.4 V. Both XRD and Raman indicate that the higher pyrolysis temperature the greater defective nature of NFC. In special, NFC900 has a high portion of mesopores with the BET surface area of 1057 m(2)/g, and XPS indicates that N and F have been co-doped into the carbon matrix with F mainly in the ionic C-F bond. (c) 2017 The Electrochemical Society. All rights reserved.