氮掺杂石墨烯原位生长碳纳米管复合过渡金属催化剂的制备及电催化性能

doi:10.11868/j.issn.1001-4381.2021.000176

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Abstract

The direct pyrolysis method was adopted with graphene as the carrier, 2-methylimidazole zinc salt MAF-4(ZIF8) and urea to provide carbon and nitrogen sources, Fe as the transition metal source, to synthesize nitrogen-doped graphene(N/GO) and Fe-ZIF8(N-GO@Fe/ZIF8) composite catalyst, assembled into a zinc-air battery. The physical-chemical properties of the catalyst were characterized by using scanning electron microscope(SEM), transmission electron microscope(TEM) and rotating disk electrode. The results show that the synthesized N-GO@Fe/ZIF8-900 catalyst has excellent oxygen reduction/oxygen evolution (ORR/OER) performance. The half wave potential is 0.885 V, which is better than that of Pt/C (0.856 V). When oxygen is precipitated, the corresponding potential is 1.811 V at a current density of 10 mA/cm², which is better than that of the noble metal Pt/C (1.968 V) and the same performance as IrO₂ (1.75 V).After being assembled into a zinc air battery, the specific energy and power density reach 886.2 mW·h·g^-1 and 73.44 mW/cm² respectively, which are higher than that of Pt/C (791.04 mW·h·g^-1, 57.12 mW/cm²) respectively. The catalyst has good application prospect.

Key words： ZIF8 carbon nanotubes in-situ growth zinc air battery

Received: 27 February 2021 Published: 18 April 2022

ZTFLH:

TM911.4

Corresponding Authors: Shengjuan LI E-mail: usstshenli@usst.edu.cn

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	Ting ZHANG
	Shengjuan LI
	Ying JI
	Tiantian YU
	Tiancheng LI
	Yuhua XUE

Cite this article:

Ting ZHANG,Shengjuan LI,Ying JI, et al. In-situ growth and performance of transition metal doped CNT/N-graphene composites[J]. Journal of Materials Engineering, 2022, 50(4): 123-131.

URL:

http://jme.biam.ac.cn/EN/10.11868/j.issn.1001-4381.2021.000176 OR http://jme.biam.ac.cn/EN/Y2022/V50/I4/123

Schematic diagram of N-GO@Fe/ZIF8-900 synthesis

SEM images of N-GO@ZIF8-900(a),N-GO@Fe-900(b) and N-GO@Fe/ZIF8-900(c)

TEM images of N-GO@Fe/ZIF8-900

XRD patterns(a) and Raman spectra(b) of N-GO@Fe-900 and N-GO@Fe/ZIF8-900, N₂ adsorption/desorption isotherm(c) and pore size distribution curve(d) of N-GO@Fe/ZIF8-900

XPS spectrum of N-GO@Fe/ZIF8-900(a),C1s spectra(b),N1s spectra(c),Fe2p spectra(d),and bar graph of different types of N and Fe atom doping(e)

LSV curves of different catalysts in 0.1 mol KOH saturated with O₂ (rotating speed:1600 r/min,scanning rate: 5 mV/s)(a),LSV curves(b),K-L curves(c),I-T test curves(d) of N-GO@Fe/ZIF8-900 catalyst under different speeds

LSV curves(a) and Tafel curves(b) of N-GO@Fe/ZIF8-900,Pt/C and IrO₂ samples

Cycle stability test curves of assembled zinc air battery at 5 mA/m²(a),specific energy curves at 10 mA/cm²(b), charge and discharge polarization curves(c) and power density curves(d)

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