电催化剂
材料科学
化学工程
碳纤维
金属有机骨架
石墨烯
析氧
电化学
过电位
纳米技术
无机化学
碳纳米管
兴奋剂
塔菲尔方程
金属
冶金
电极
复合材料
有机化学
光电子学
物理化学
复合数
吸附
化学
作者
Shuyan Gao,Baofa Fan,Rui Feng,Cunling Ye,Xianjun Wei,Jian Liu,Xian-He Bu
出处
期刊:Nano Energy
[Elsevier]
日期:2017-10-01
卷期号:40: 462-470
被引量:177
标识
DOI:10.1016/j.nanoen.2017.08.044
摘要
Abstract Nowadays, the hybrids of non-noble metal and heteroatom-doped carbon, especially, transition-metal-nitrogen-carbon materials, have been extensively studied as promising next-generation oxygen reduction reaction (ORR) catalysts in energy conversion. However, the pyrolysis of normal metal/nitrogen/carbon-containing precursors usually generates uncontrollable agglomeration or inhomogeneous microstructure, hence leading to insufficient exposure of the active sites and poor mass transport. In this work, a new strategy for fabricating N-doped-carbon-coated Fe3O4 (denoted as NC@Fe3O4) is proposed by the pyrolysis of polyaniline (PANI)-coated Fe-based metal organic frameworks (MIL-101-Fe). The optimal catalyst exhibits a very positive ORR onset potential close to that of Pt/C, quasi-four-electron-transfer pathway and high long-term cycle stability in alkaline media. This work demonstrates the crucial role of thin PANI film (a highly conductive skeleton and heteroatoms sources) together with MOFs to rationalize the superior ORR performance for the resulting NC@Fe3O4. The generality of the conductive-polymer-layer-assisted synthetic strategy is expected to further boost the electrocatalytic activity of universal non-noble-metal hybrid electrocatalyst for practical fuel-cell applications.
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