Issue 1, 2024

Manganese–cobalt geomimetic materials for supercapacitor electrode

Abstract

A manganese–cobalt asbolane material synthesized by low-temperature cationic exchange from birnessite in cobalt nitrate solution has been comprehensively characterized and tested for the first time as a massive (with high active mass loading) positive electrode material for to asymmetric aqueous supercapacitors. The structure of this Mn-rich material, which is homologous to the natural asbolanes well known by mineralogists, consists of MnO2-type slabs with partial substitution of Co3+ for Mn; the slabs alternate with Co(OH)2 islands located in the interlayer spacing. This structural arrangement was confirmed through in-depth electronic transmission microscopy analyses, which reveal two interlocking hexagonal sublattices with distinct a lattice-cell parameters but identical c parameters. The electrochemical performance of this geomimetic phase in alkaline electrolytes is highly promising, with specific capacitance of up to 180 F g−1 at moderate current densities and 94 F g−1 at 10 A g−1. Investigation into the charge storage mechanisms indicates effective synergy between the pseudocapacitive properties of the MnO2 slabs and the Co(OH)2 islands, in which protonic conduction is suspected to play a key role. Additionally, long-term cycling and calendar aging tests suggest that the interlayer cobalt gradually migrates to the metal oxide layer upon cycling while maintaining excellent energy storage performance. This study clearly underscores the value of exploring geomimetic minerals as potential electrode materials for energy storage applications.

Graphical abstract: Manganese–cobalt geomimetic materials for supercapacitor electrode

Supplementary files

Article information

Article type
Paper
Submitted
10 okt. 2023
Accepted
13 nóv. 2023
First published
23 nóv. 2023

Dalton Trans., 2024,53, 315-332

Manganese–cobalt geomimetic materials for supercapacitor electrode

T. Tailliez, J. Olchowka, F. Weill, S. Buffière, M. Dourges, D. Flahaut and L. Guerlou-Demourgues, Dalton Trans., 2024, 53, 315 DOI: 10.1039/D3DT03342B

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements