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Mono-Dispersed MnO Nanoparticles in Graphene-Interconnected N-Doped 3D Carbon Framework as Highly efficient Gas Cathode in Li-CO2 Batteries

Abstract

Li-CO2 batteries are developed in recent years aiming to utilize CO2, a major cause of greenhouse effect, as effective energy storage medium. However, current Li-CO2 batteries still suffer from low energy efficiency, poor rate capability and short cycle life, asking for the design of more efficient CO2 cathodes. Herein, we synthesized ultrafine MnO nanoparticles dispersed in graphene-interconnected N-doped 3D carbon frameworks, MnO@NC-G, by pyrolyzing a composite of GO-wrapped metal-organic framework (MOF) containing Mn(II) active sites, as the cathode material for Li-CO2 batteries. This material can enable low voltage hysteresis (0.88 V at 50 mA g−1), high rate capability (up to 1 A g−1) and long cycle life (more than 200 cycles) of the cells. By comparing MnO@NC-G with four other Mn(II)-based cathodes, MnO@NC, parent Mn-MOF, MnO@KB and bulk MnO, we propose three key aspects for designing the CO2 cathode: 1) dispersed catalytic species, 2) fast electron transport and 3) robust interconnected network. We also found that the performance of a cycled MnO@NC-G cathode can be replenished simply by replacing the anode, indicating that the cells' cycle life can be further extended with effective anode protection. Our findings here provide useful guidelines for improving the performance of Li-CO2 batteries, may thus sheding light on the development of practical Li battery systems based on gaseous cathodes.

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Publication details

The article was received on 08 Nov 2018, accepted on 08 Feb 2019 and first published on 08 Feb 2019


Article type: Paper
DOI: 10.1039/C8EE03283A
Citation: Energy Environ. Sci., 2019, Accepted Manuscript

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    Mono-Dispersed MnO Nanoparticles in Graphene-Interconnected N-Doped 3D Carbon Framework as Highly efficient Gas Cathode in Li-CO2 Batteries

    S. Li, Y. Liu, J. Zhou, S. Hong, Y. Dong, J. Wang, X. Gao, P. Qi, Y. Han and B. Wang, Energy Environ. Sci., 2019, Accepted Manuscript , DOI: 10.1039/C8EE03283A

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