碳纤维
催化作用
多孔性
氮气
材料科学
化学工程
阴极
介孔材料
氧气
甲醇
比表面积
无机化学
化学
复合材料
有机化学
物理化学
复合数
工程类
作者
Chengyong Shu,Zhuofan Gan,Yuyang Hou,Ting Zhu,Jie Ma,Wei Tang,Yuping Wu
出处
期刊:Energy & environmental materials
日期:2020-07-20
卷期号:4 (1): 81-87
被引量:12
摘要
The search for a low‐cost metal‐free cathode material with excellent mass transfer structure and catalytic activity in oxygen reduction reaction (ORR) is one of the most challenging issues in fuel cells. In this work, nitrogen‐rich m‐phenylenediamine is introduced into the synthesis of porous carbon spheres to tune the pore structure and nitrogen‐doped active sites. As a result, more pyridinic N and pyrrolic N functional species were observed at the interior and surface of the carbon spheres. The introduction of m‐phenylenediamine also regulated the nucleating of precursors, an urchin‐like mesoporous surface structure ensures point contact and less agglomeration between each particle was obtained. With optimized proportion of micropores/mesopores and improved nitrogen‐contained functional species, the ORR activity can be remarkably improved. The half‐wave potential of this catalyst could achieve to 0.81 V (versus RHE) which is only 42 mV lower than commercial Pt/C catalyst. Furthermore, the optimized cathode catalyst achieved a 69 mW cm −2 maximum power density when operated in direct methanol fuel cells at room temperature.
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