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- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
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Received January 31, 2024
Accepted March 11, 2024
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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NiO-Decorated rGO Functional Layer on the Graphite Felt as the Negative Electrode of Vanadium Redox Flow Batteries
Abstract
Vanadium redox fl ow batteries (VRFBs) are prospective energy-storage medium owing to their fl exible design and long
lifetime. However, the problem of sluggish negative electrode dynamics of VRFBs has become a great resistance to their
large-scale commercial applications. To solve this problem, we employed a facile and cost-eff ective approach to synthesize
NiO/rGO composites using hydrothermal and calcination processes. The NiO/rGO nanocatalysts were evenly applied onto
the heat-treated graphite felt (HGF) to prepare a high-performance negative electrode for VRFBs. This coating process was
achieved using an ultrasonic spraying system, resulting in NiO/rGO-HGF. The NiO/rGO electrocatalysts provided enhanced
adsorption characteristics of vanadium ions and suffi cient redox-reactive sites, which improved electrochemical performance
(9.41% higher energy effi ciency of NiO/rGO-HGF compared with HGF at 160 mA cm −2 ) and high cycle stability (84.7%
electrolyte capacity after 100 cycles) of the VRFB cells. In conclusion, our work with the NiO/rGO-HGF anode represents a
promising direction for the development of highly effi cient and stable VRFB anodes for broadening commercial applications.
