外交变磁场对碳纸原位负载MOFs衍生氮掺杂多孔碳OER性能的影响

doi:10.19976/j.cnki.43-1448/TF.2021094

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Abstract In-situ loaded two kinds of precursors MOF(denoted as Zn-MOF-74 and ZIF-8) on the surface of carbon paper (CP) were successfully prepared by solvothermal method. After high temperature heat treatment, the precursors were derived into nitrogen-doped porous carbon, and the nitrogen-doped porous carbon @CP electrocatalyst material samples were obtained, named CP-Zn-MOF-74-900-N₂ and CP-ZIF-8-900-N₂, respectively. The effects of CP composition, pore structure and magnetic field intensity on OER(oxygen evolution reaction) were investigated. The results show that the in-situ loaded ZIF-8 forms a dense layer of rectangular dodecahedral particles on the fiber surface of CP, and forms a uniform nanoscale nitrogen-doped carbon material on the fiber surface after heat treatment. ZIF-8-900-N₂ has a specific surface area of 1559 m²/g, pore size of 0.57 nm and pore volume of 1.59 cm³/g, which has the best magnetic properties and magneto-heating properties. CP-ZIF-8-900-N₂ achieves a lowest OER overpotential of 334 mV(current density of 10 mA/cm², iR-corrected) and Tafel slope of 187 mV/dec among carbon paper and nitrogen-doped porous carbon @CP materials. When the external magnetic field exists, the OER overpotential of the catalyst first decreases and then remains unchanged with the increase of magnetic field intensity. And CP-ZIF-8-900-N₂obtains the lowest overpotential of 316 mV (current density is 10 mA/cm², non-iR-corrected) under a magnetic field intensity of 5.54×10^-3 T, which is 20.4% lower than that without AC magnetic field. This is mainly due to the reduction of bubble size and the enhancement of bubble coalescence caused by the magneto hydrodynamic effect, which improves the desorption of bubbles from the electrode surface.

Key words： In-situ load Zn-MOF-74 ZIF-8 nitrogen-doped porous carbon oxygen evolution reaction AC magnetic field

Received: 10 November 2021 Published: 07 May 2022

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	LI Yuling
	WANG Yuanli
	LI Dongyun
	QIN Hang
	GUO Wenming
	LIU Xiaopan
	GAO Pengzhao
	XIAO Hanning

Cite this article:

LI Yuling,WANG Yuanli,LI Dongyun, et al. Effect of AC magnetic field on the OER properties of nitrogen-doped porous carbon derived from MOFs in-situ loaded carbon paper[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(2): 224-236.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2021094 OR http://pmbjb.csu.edu.cn/EN/Y2022/V27/I2/224

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