Probing the Function of a Li-CO2Battery with a MXene/Graphene Oxide Composite Cathode Electrocatalyst

Bharti, A and Manna, G and Saha, P and Achutarao, G and Bhattacharyya, AJ (2022) Probing the Function of a Li-CO2Battery with a MXene/Graphene Oxide Composite Cathode Electrocatalyst. In: Journal of Physical Chemistry Letters, 13 (32). pp. 7380-7385.

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Abstract

We systematically diagnose here the various phases formed at the electrodes in a Li-CO2 battery. The CO2 cathode comprises a mixture of two-dimensional electrocatalysts, MXene and graphene oxide (MXene/GO), configured on Ni foam. The observed overpotential for MXene/GO (2.4 V) is lower than that for GO (2.8 V). MXene/GO also outperforms GO in terms of battery stability and performance. The overall battery reaction (Li2CO3 Li + CO2) is more efficient in the case of MXene/GO than in the case of GO. This is convincingly demonstrated using ex situ high-resolution synchrotron X-ray diffraction and Raman scattering spectroscopy, which strongly indicates that the MXene/GO composite is more capable than GO in converting Li2CO3 to Li and CO2. When the Li anode is probed, CO2 crossover is evident via the observation of the formation of LiOH/Li2CO3 phases, the proportions of which change during successive cycles. © 2022 American Chemical Society.

Item Type:	Journal Article
Publication:	Journal of Physical Chemistry Letters
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to the American Chemical Society.
Keywords:	Cathodes; Electrocatalysts; Graphene; Lithium; Lithium batteries; Lithium compounds, Composite cathode; Ex situ; Graphene oxides; High resolution; Li +; Ni foam; Overpotential; Oxide composites; Performance; Two-dimensional, Carbon dioxide
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	13 Sep 2022 06:41
Last Modified:	13 Sep 2022 06:41
URI:	https://eprints.iisc.ac.in/id/eprint/76761

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