Boosting the reaction kinetics in aprotic lithium-carbon dioxide batteries with unconventional phase metal nanomaterials

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Article numbere2204666119
Journal / PublicationProceedings of the National Academy of Sciences
Volume119
Issue number40
Online published26 Sept 2022
Publication statusPublished - 4 Oct 2022

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Abstract

Given the high energy density and eco-friendly characteristics, lithium-carbon dioxide (Li-CO2) batteries have been considered to be a next-generation energy technology to promote carbon neutral and space exploration. However, Li-CO2 batteries suffer from sluggish reaction kinetics, causing large overpotential and poor energy efficiency. Here, we observe enhanced reaction kinetics in aprotic Li-CO2 batteries with unconventional phase 4H/face-centered cubic (fcc) iridium (Ir) nanostructures grown on gold template. Significantly, 4H/fcc Ir exhibits superior electrochemical performance over fcc Ir in facilitating the round-trip reaction kinetics of Li+-mediated CO2 reduction and evolution, achieving a low charge plateau below 3.61 V and high energy efficiency of 83.8%. Ex situ/in situ studies and theoretical calculations reveal that the boosted reaction kinetics arises from the highly reversible generation of amorphous/low-crystalline discharge products on 4H/fcc Ir via the Ir-O coupling. The demonstration of flexible Li-CO2 pouch cells with 4H/fcc Ir suggests the feasibility of using unconventional phase nanomaterials in practical scenarios.

Research Area(s)

  • electrochemical mechanism, Ir nanostructures, Li-CO2 battery, reaction kinetics, unconventional phase

Citation Format(s)

Boosting the reaction kinetics in aprotic lithium-carbon dioxide batteries with unconventional phase metal nanomaterials. / Zhou, Jingwen; Wang, Tianshuai; Chen, Lin et al.
In: Proceedings of the National Academy of Sciences, Vol. 119, No. 40, e2204666119, 04.10.2022.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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