Journal
APPLIED ENERGY
Volume 176, Issue -, Pages 74-79Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2016.05.048
Keywords
Vanadium redox flow battery; Thin electrode; Carbon nanoparticles; Energy efficiency
Categories
Funding
- Research Grants Council of the Hong Kong Special Administrative Region, China [623313]
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Increasing the performance of vanadium redox flow batteries (VRFBs), especially the energy efficiency and power density, is critically important to reduce the system cost to a level for widespread commercialization. Unlike conventional VRFBs with flow-through structure, in this work we create a VRFB featuring a flow-field structure with a carbon nanoparticle-decorated graphite felt electrode for the battery. This novel structure, exhibiting a significantly reduced ohmic loss through reducing electrode thickness, an increased surface area and improved electrocatalytic activity by coating carbon nanoparticles, allows the energy efficiency up to 84.8% at a current density of as high as 100 mA cm(-2) and the peak power density to reach a value of 508 mW cm(-2). In addition, it is demonstrated that the battery with this proposed structure exhibits a substantially improved rate capability and capacity retention as opposed to conventional flow-through structured battery with thick graphite felt electrodes. (C) 2016 Elsevier Ltd. All rights reserved.
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