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In-situ growth and performance of transition metal doped CNT/N-graphene composites |
Ting ZHANG, Shengjuan LI( ), Ying JI, Tiantian YU, Tiancheng LI, Yuhua XUE |
School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China |
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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.
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Received: 27 February 2021
Published: 18 April 2022
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Corresponding Authors:
Shengjuan LI
E-mail: usstshenli@usst.edu.cn
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Schematic diagram of N-GO@Fe/ZIF8-900 synthesis
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SEM images of N-GO@ZIF8-900(a),N-GO@Fe-900(b) and N-GO@Fe/ZIF8-900(c)
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TEM images of N-GO@Fe/ZIF8-900
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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
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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)
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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
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LSV curves(a) and Tafel curves(b) of N-GO@Fe/ZIF8-900,Pt/C and IrO2 samples
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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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