N-doped hierarchically macro/mesoporous carbon with excellent electrocatalytic activity and durability for oxygen reduction reaction
N-doped hierarchically macro/mesoporous carbon with excellent electrocatalytic activity and durability for oxygen reduction reaction
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氮掺杂分级粗/介孔碳具有优异的电催化活性和氧还原反应的耐久性
DOI：
10.1016/j.carbon.2014.12.102
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发表时间：
2015-05-01
期刊：
影响因子：
10.9
通讯作者：
Shi, Jianlin
中科院分区：
文献类型：
--
作者：
Tao, Guiju;Zhang, Lingxia;Shi, Jianlin
以分级结构的大孔/介孔氧化硅为硬模板剂，以廉价无毒的尿素为氮源，通过简单的氮掺杂工艺，成功合成了一种新型的氮掺杂分级结构多孔碳材料（HPC-Ns）。合成的HPC-N样品具有广泛的三维（3D）连通的大孔和部分有序的中孔，极大的比表面积，良好的石墨化度，以及高的吡啶氮相对含量，这是积极的氧还原反应（ORR）。由于上述特征的组合贡献，无金属的HPC-Ns在ORR方面表现出优异的性能，与商业Pt/C相比，具有高度可比的极限电流密度，但具有高得多的电流输出稳定性和对燃料交叉效应的抗性，以及占主导地位的4 e（-）还原机制。因此，认为HPC-N具有用于聚合物电解质膜燃料电池的潜力。(C)2015爱思唯尔有限公司版权所有。
A novel kind of N-doped hierarchically porous carbon materials (HPC-Ns) has been successfully synthesized with hierarchically macro/mesoporous silica as a hard template followed by a simple N-doping procedure using low-cost and nontoxic urea as the nitrogen source. The synthesized HPC-N samples demonstrated extensive three-dimensional (3D) connected macroporosity and partially ordered mesoporosity, extremely large specific surface area, favorable graphitization degree, and high relative content of pyridinic N, which is active to the oxygen reduction reaction (ORR). Due to the combined contributions of the above features, the metal-free HPC-Ns demonstrated excellent performance in ORR with a highly comparable limiting current density but much higher current output stability and resistance towards the fuel crossover effect compared to the commercial Pt/C, as well as the dominant 4 e(-) reduction mechanism. Thus, it is believed that HPC-N has the potential to be used in polymer electrolyte membrane fuel cells. (C) 2015 Elsevier Ltd. All rights reserved.