An amino-functionalized metal-organic framework achieving efficient capture-diffusion-conversion of CO2 towards ultrafast Li-CO2 batteries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Jiafeng He
  • Xiliang Zhao
  • Xiaoke Wang
  • Cuiping Han

Detail(s)

Original languageEnglish
Journal / PublicationJournal of Materials Chemistry A
Volume10
Issue number35
Online published16 Aug 2022
Publication statusPublished - 21 Sep 2022

Abstract

Li-CO2 batteries provide a promising solution towards global sustainability since they are not only an energy storage device but also a recycling system of CO2 gas. However, Li-CO2 batteries suffer from sluggish diffusion of CO2 and poor electrode kinetics which gives rise to a large charge/discharge overpotential and low energy conversion efficiency. Herein, we design a composite of amino-group functionalized metal-organic framework encapsulated RuO2 nanoparticles (NH2-Cu-MOFs@RuO2). The amino groups on the pore wall help achieve high capture efficiency of CO2 and the ordered pores in the MOFs provide efficient transport channels for CO2/Li+ diffusion. Meanwhile, the synergistic catalytic effect of Cu nodes and RuO2 enables fast conversion of CO2 molecules. Benefitting from the capture-diffusion-conversion synergetic effects, the NH2-Cu-MOFs@RuO2 cathode exhibits a low cut-off overpotential of 1.21 V within a limiting capacity of 100 μA h cm−2 and a high capacity of 2903 μA h cm−2 at a current density of 50 μA cm−2. The rate performance improves significantly when using the NH2-Cu-MOFs@RuO2 as the cathode, where the battery presents a tardy decrease of discharge voltage and a slight increase of charge voltage from a current density of 20 to 1000 μA cm−2 and even retains ∼2.6 V discharge voltage at a high current density of 1000 μA cm−2. Such a functionalized MOF-supported structure suggests a new way to produce efficient catalysts that improve the performance of diffusion-limited applications.

Citation Format(s)

An amino-functionalized metal-organic framework achieving efficient capture-diffusion-conversion of CO2 towards ultrafast Li-CO2 batteries. / Hong, Hu; He, Jiafeng; Wang, Yanbo et al.

In: Journal of Materials Chemistry A, Vol. 10, No. 35, 21.09.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review