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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 August 18, 2024
Accepted September 25, 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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Highly Electrocatalytic Activity of Micro and Nanocomposite Phase Engineering of MoO 3− x @K 3 PW 12 O 40 Decorated on Graphite Felt for High-Performance VRFB
Abstract
The catalytic activity of metal cations exchanged with heteropoly acids (HPA) and the selectivity towards precursor composite
materials can be tailored by adjusting the reaction mechanism. A structural defect engineering strategy was developed for
the metallic phase of O-MoS 2 , doped with a Keggin-type HPA to serve as a double gyroid layer (O-MoS 2 @HPA). This was
achieved through thermal oxidation treatment to enable a high surface area by depositing abundant catalytically active sites
on the graphite felt. Optimization strategies involving MoO 3− x (MoO 3− x @K 3 PW 12 O 40 ) species have been crafted, anchoring
active sites in a spherical nanomorphology through the self-assembly of acid. This development introduces a new approach
for enhancing electrocatalysts, aiming for superior performance in VRFB. The electrochemical results show remarkable
enhancement in electrocatalytic behavior with abundant heteroatom active sites, promoting oxidation at a high current density
of 150 mA/cm 2 , achieving an outstanding 84.62% high energy effi ciency. This result is 14% higher than pristine graphite felt
and exhibits extraordinary stability after 1350 cycles, overcoming the sluggish kinetic mechanism that limits redox active
materials. This study creates new avenues for the design of hybrid micro/nanostructured materials on cathodes and anodes
to achieve excellent performance as electrocatalysts for VRFB.
