Sulfur doped Fe-N-C catalysts derived from Dual-Ligand zeolitic imidazolate framework for the oxygen reduction reaction

被引:28
作者
Maouche, Chanez [1 ]
Wang, Yongying [1 ]
Cheng, Chao [1 ]
Wang, Wenlong [1 ]
Li, Yi [1 ]
Qureshi, Waqar A. [1 ]
Huang, Pengwei [1 ]
Amjad, Ali [1 ]
Zhou, Yazhou [1 ]
Yang, Juan [1 ]
机构
[1] Jiangsu Univ, Sch Mat Sci & Engn, Zhenjiang 212013, Jiangsu, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
Fe-N-C; S-doping; Dual-ligand; Zeolitic imidazolate frameworks; REDUCED GRAPHENE OXIDE; CARBON NANOFIBERS; EFFICIENT; ELECTROCATALYSTS; PERFORMANCE; STABILITY; ALKALINE; METAL; FABRICATION; SPHERES;
D O I
10.1016/j.jcis.2022.04.157
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Iron-nitrogen-carbon (Fe-N-C) catalysts derived from zeolitic-imidazolate frameworks (ZIFs) are worldwide accepted to be the most promising candidates for the oxygen reduction reaction (ORR), but the insufficient stability, the low FeNx exposure and poor density restrict their ORR activity. Here, we demonstrate a strategy to synthesize FeNx sites embedded in a micro/mesoporous N, S co-doped graphitic carbon (Fe-N-C/MUS) by tuning the ligand linkers via the addition of 2-undecylimidazole as a co-ligand in ZIF precursors, and optimizing the electronic structure of Fe center by an in-situ addition of thiourea molecules as sulfur (S) source. 2-undecylimidazole offered an open porous structure to incorporate more FeNx, while the S-doping increased the density of FeNx. Besides, 2-undeclyimidazole cooperatively with S-doping caused favorable changes into the catalyst structure, particularly improved the exposure and density of FeNx sites and doubled the Brunauer-Emmetter-Teller surface area to 1132 m(2) g(-1) contrasted to the pristine Fe-N-C/M (544 m(2) g(-1)). Fe-N-C/MUS displayed an accelerated ORR activity with a higher half-wave potential of 0.86 V (vs. reversible hydrogen electrode (RHE)) than that of Pt/C (0.84 V) in addition of a longer durability with a 11 % of activity decay after 30 000 s in alkaline media. This work offers a new insight to design optimal ZIFs precursor and a facile electron withdrawing S-doping strategy for efficient electrocatalysis. (C) 2022 Elsevier Inc. All rights reserved.
引用
收藏
页码:146 / 154
页数:9
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