Imaduddin, I. S. and Idris, N. H. and Dar, M. A. and Majid, S. R. (2025) Enhancement of cycling capacity and stability of Co3O4/Ca4O4 as a cathode material in aqueous calcium-ion electrolytes via the integration of reduced graphene oxide (rGO). Journal of Alloys and Compounds, 1014. ISSN 0925-8388, DOI https://doi.org/10.1016/j.jallcom.2025.178626.
Full text not available from this repository.Abstract
Interest in water-based battery electrolytes is growing in the quest for more reliable and cost-effective energy storage systems. Because of their safety, affordability, and material abundance, aqueous calcium-ion batteries (ACIBs) have been aimed to replace commercial large-scale energy storage devices in the future. However, the large ionic size and polar nature of Ca-2(+) lead to sluggish ion kinetics and low conductivity, requiring an electrode host to sustain large structural stress and provide electronic conductivity. In this study, reduced graphene oxide (rGO) is utilized as an additive to improve the electrochemical performance of the Co3O4/Ca4O4 compound by simple pestle-and-mortar grinding, as cathode materials for ACIB applications. The rGO addition to Co3O4/Ca4O4 compound (Co3O4/Ca4O4@2.5rGO) induces a reversible specific capacity of 75.06 mAh g(-1) after 150 cycles at 100 mA g(-1) current density, which increases Co3O4/Ca4O4 specific capacity by 30.47 %, with Coulombic efficiencies of similar to 100 % in 1 M Ca(NO3)(2) aqueous electrolyte. The rate capability study also reveals that Co3O4/Ca4O4@2.5rGO retains 53.14 % and 45.62 % of the specific capacities at high current densities of 400 and 500 mA g(-1), respectively. The ion-storage mechanism, kinetics, and structural evolution are also investigated to understand the improved performances of Co3O4/Ca4O4@rGO.
| Item Type: | Article |
|---|---|
| Funders: | Ministry of Education, Malaysia [Grant No: FRGS/1/2024/STG05/UM/01/1] |
| Uncontrolled Keywords: | Aqueous Ca-ion batteries; Cathode materials; RGO additives; Aqueous electrolyte; Cycling capacity stabilizers |
| Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
| Divisions: | Faculty of Science > Department of Physics |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 01 Oct 2025 03:20 |
| Last Modified: | 01 Oct 2025 03:20 |
| URI: | http://eprints.um.edu.my/id/eprint/47993 |
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