A Stabilized Assisted Method for the Synthesis of Fe-N-C Catalysts for the Oxygen Reduction Reaction
A Stabilized Assisted Method for the Synthesis of Fe-N-C Catalysts for the Oxygen Reduction Reaction
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DOI：
10.1149/1945-7111/ac7260
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Juan Yang
中科院分区：
文献类型：
--
作者：
Chanez Maouche;Yazhou Zhou;Bing Li;Chao Cheng;Zirui Wu;Xue Han;Shaosheng Rao;Yi Li;Nasir Rahman;Juan Yang
Abstract Iron-nitrogen-carbon graphitic (Fe-N-C), a noble metal-free catalyst, holds a lot of promise as a substitute for platinum (Pt) as an efficient catalyst in the oxygen reduction reaction (ORR). However, the synthesis process and the stabilization of single atoms that tend to aggregate, without jeopardizing the catalytic activity, remain challenging. Here we demonstrate a stabilized assisted method for the preparation of Fe-N-C electrocatalyst by using graphitic carbon nitride (g-C3N4) nanosheet as a template. Fe ions are absorbed on the surface of g-C3N4 and imprisoned after the addition of pyrrole, preventing Fe migration that may result in nanoparticles. During pyrolysis, Fe atoms coordinated with N provided by g-C3N4 and pyrrole on graphitic carbon to form Fe-N-C with a metal loading of 5.4 wt%. Moreover, FeNx species were introduced in the graphitic carbon, where the coexistence of micro and mesopores were favorable to offer a larger density of active sites compared to Fe/NP without pyrrole. Fe-N-C demonstrated a good electrocatalytic performance with a half-wave potential (E1/2) of 0.82 V (vs. reversible hydrogen electrode (RHE)) higher than Fe/NP (0.76 V) and close to Pt/C, with a superior long stability of 85 % in alkaline media after 40000 s.
