ZIFs材料对Fe/N/C催化剂氧还原性能的影响

doi:10.11896/cldb.22100278

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Abstract Transition metal/nitrogen/carbon (M/N/C) catalysts are the most promising candidates to replace platinum-based catalysts for oxygen reduction reaction (ORR). Zeolitic imidazolate frameworks (ZIFs) are ideal precursors for the preparation of M/N/C catalysts since they combine the high stability of inorganic zeolites and the high specific surface area, high porosity, and tunable pore structure of MOFs materials. In this work, FeN/C-Z_x catalysts were synthesized using FeSO₄·7H₂O, 1, 10-phenanthroline, and ZIFs as iron, nitrogen, and carbon precursors, respectively. The effect of using different ZIFs as carbon precursors on the ORR activity of FeN/C-Z_x catalysts were investigated. The structure of the catalyst was characterized by X-ray diffraction, specific surface area and pore size distribution test, and transmission electron microscope. The catalytic activity of the catalyst for ORR was tested by linear scanning voltammetry. The results show that the FeN/C-Z₈ catalyst exhibits the best ORR activity, a small Tafel slope (64.98 mV/dec) with a nearly four-electron reaction process, and a good stability with only 20 mV negative shift in half-wave potential after 25 000 cycles of accelerated degradation tests. The Fe₃C compound, which can effectively improve the catalytic activity, present in the FeN/C-Z₈ catalyst;the high specific surface area (550.09 m²/g) and pore volume (1.36 cm³/g), the abundant micropore and mesoporous structure, as well as the uniform distribution of transition metals on the ZIFs materials and the small catalyst particles size due to the volatilization of Zn²⁺ during the carbonization process, are the possible reasons to increase the ORR catalytic performance of FeN/C-Z₈ catalyst.

Key words： oxygen reduction reaction (ORR) non-precious metal catalyst zeolitic imidazolate frameworks (ZIFs) FeN doping

Published: 25 May 2024 Online: 2024-05-28

CLC number:

O643.36

Fund:National Natural Science Foundation of China (21965006, 22005072), Key Laboratory of Alcohol Fuel Cell and Composite Energy, Chinese Academy of Sciences (KLFC201703).

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	Articles by authors
	SONG Dongmei
	ZHENG Qiuyan
	PAN Tingxian
	HU Changgang
	TONG Xin
	TIAN Juan

Cite this article:

SONG Dongmei,ZHENG Qiuyan,PAN Tingxian, et al. Effect of ZIFs Materials on the Oxygen Reduction Performance of Fe/N/C Catalysts[J]. Materials Reports, 2024, 38(10): 22100278-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22100278 OR http://www.mater-rep.com/EN/Y2024/V38/I10/22100278

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