An amino-functionalized metal–organic framework achieving efficient capture–diffusion–conversion of CO2 towards ultrafast Li–CO2 batteries. Issue 35 (30th August 2022)

• Record Type: Journal Article
• Authors: Hong, Hu; He, Jiafeng; Wang, Yanbo; Guo, Xun; Zhao, Xiliang; Wang, Xiaoke; Zhi, Chunyi; Li, Hongfei; Han, Cuiping
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 35(2022)
• Page Start: 18396
• Page End: 18407
• Publication Date: 2022-08-30
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta05342j
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : An amino-functionalized metal–organic framework achieves efficient capture–diffusion–conversion of CO2 . 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.