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In-situ self-templated preparation of porous core–shell Fe1−xS@N, S co-doped carbon architecture for highly efficient oxygen reduction reaction
Journal of Energy Chemistry ( IF 14.0 ) Pub Date : 2020-06-17 , DOI: 10.1016/j.jechem.2020.06.010
Zhi Li , Wei Wang , Minjie Zhou , Binhong He , Wenqing Ren , Liang Chen , Wenyuan Xu , Zhaohui Hou , Yangyang Chen

Transition metal compound (TMC)/carbon hybrids, as prospering electrocatalyst, have attracted great attention in the field of oxygen reduction reaction (ORR). Their morphology, structure and composition often play a crucial role in determining the ORR performance. In this work, we for the first time report the successful fabrication of porous core–shell Fe1−xS@N, S co-doped carbon (Fe1−xS@NSC-t, t represents etching time) by a novel in-situ self-template induced strategy using Fe3O4 nanospheres and pyrrole as sacrificial self-template. The post-polymerization of pyrrole can be accomplished by the Fe3+ released through the etching of Fe3O4 by HCl acid. Thus, the etching time has a significant effect on the morphology, structure, composition and ORR performance of Fe1−xS@NSC-t. Based on the characterizations, we find Fe1−xS@NSC-24 can realize effective and balanced combination of Fe1−xS and NSC, possessing porous core–shell architecture, optimized structure defect, specific surface area and doped heteroatoms configurations (especially for pyridinic N, graphitic N and Fe-N structure). These features thus lead to outstanding catalytic activity and cycling stability towards ORR. Our work provides a good guidance on the design of TMC/carbon-based electrodes with unique stable morphology and optimized structure and composition.



中文翻译:

原位自模板制备多孔核-壳Fe1-xS @ N,S共掺杂碳结构以实现高效氧还原反应

过渡金属化合物(TMC)/碳杂化物作为繁荣的电催化剂,在氧还原反应(ORR)领域引起了极大的关注。它们的形态,结构和组成通常在决定ORR性能方面起着至关重要的作用。在这项工作中,我们首次报道了通过新颖的方法成功地制造了多孔核-壳Fe 1 - x S @ N,S共掺杂碳(Fe 1- x S @ NSC- tt表示蚀刻时间)-原位自模板,使用铁诱导的策略3 ö 4纳米球和吡咯作为牺牲自模板。吡咯的后聚合可通过Fe来完成通过盐酸腐蚀Fe 3 O 4释放出3+。因此,刻蚀时间对Fe 1- x S @ NSC- t的形貌,结构,组成和ORR性能具有重要影响。根据表征,我们发现Fe 1 - x S @ NSC-24可以实现Fe 1- x的有效平衡平衡S和NSC具有多孔核-壳结构,优化的结构缺陷,比表面积和掺杂的杂原子构型(特别是对于吡啶N,石墨N和Fe-N结构而言)。这些特征因此导致优异的催化活性和对ORR的循环稳定性。我们的工作为TMC /碳基电极的设计提供了良好的指导,这些电极具有独特的稳定形态和优化的结构与成分。

更新日期:2020-06-17
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