Preprint Article Version 2 Preserved in Portico This version is not peer-reviewed

Novel NH4V4O10-Reduced Graphene Oxide Cathodes for Zinc-Ion Batteries: Theoretical Predictions and Experimental Validation

Version 1 : Received: 2 May 2024 / Approved: 2 May 2024 / Online: 2 May 2024 (10:02:37 CEST)
Version 2 : Received: 23 June 2024 / Approved: 24 June 2024 / Online: 24 June 2024 (13:52:57 CEST)

How to cite: Lin, H.; Liu, C.; Zhang, Y. Novel NH4V4O10-Reduced Graphene Oxide Cathodes for Zinc-Ion Batteries: Theoretical Predictions and Experimental Validation. Preprints 2024, 2024050122. https://doi.org/10.20944/preprints202405.0122.v2 Lin, H.; Liu, C.; Zhang, Y. Novel NH4V4O10-Reduced Graphene Oxide Cathodes for Zinc-Ion Batteries: Theoretical Predictions and Experimental Validation. Preprints 2024, 2024050122. https://doi.org/10.20944/preprints202405.0122.v2

Abstract

This investigation explores the potential of enhancing aqueous zinc-ion batteries (AZIBs) through the introduction of a novel cathode material, NH4V4O10 (NVO), combined with reduced graphene oxide (rGO). Utilizing Density Functional Theory (DFT), it was hypothesized that the incorpora-tion of rGO would increase the interlayer spacing of NVO and diminish the charge transfer in-teractions, thus promoting enhanced diffusion of Zn2+ ions. These theoretical predictions were substantiated by experimental data acquired from hydrothermal synthesis, which indicated a marked increase in interlayer spacing. Significantly, the NVO-rGO composite exhibits remarkable cyclic durability, maintaining 95% of its initial specific capacity of 507 mAh g−1 after 600 cycles at a current density of 5 A g−1. The electrochemical performance of NVO-rGO not only surpasses that of pristine NVO but also outperforms the majority of existing vanadium oxide cathode materials reported in the literature. This study underscores the effective integration of theoretical insights and experimental validation, contributing to the advancement of high-performance energy storage technologies.

Keywords

zinc-ion batteries; cathode materials; NH4V4O10; reduced graphene oxide

Subject

Chemistry and Materials Science, Electrochemistry

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