Mesoporous tungsten oxynitride as electrocatalyst for promoting redox reactions of vanadium redox couple and performance of vanadium redox flow battery
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- Title
- Mesoporous tungsten oxynitride as electrocatalyst for promoting redox reactions of vanadium redox couple and performance of vanadium redox flow battery
- Authors
- Lee, W.; Jo, C.; Youk, S.; Shin, H.Y.; Lee, J.; Chung, Y.; Kwon, Y.
- Date Issued
- 2018-01-31
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- For enhancing the performance of vanadium redox flow battery (VRFB), a sluggish reaction rate issue of V2+/V3+ redox couple evaluated as the rate determining reaction should be addressed. For doing that, mesoporous tungsten oxide (m-WO3) and oxyniride (m-WON) structures are proposed as the novel catalysts, while m-WON is gained by NH3 heat treatment of m-WO3. Their specific surface area, crystal structure, surface morphology and component analysis are measured using BET, XRD, TEM and XPS, while their catalytic activity for V2+/V3+ redox reaction is electrochemically examined. As a result, the m-WON shows higher peak current, smaller peak potential difference, higher electron transfer rate constant and lower charge transfer resistance than other catalysts, like the m-WO3, WO3 nanoparticle and mesoporous carbon, proving that it is superior catalyst. Regarding the charge-discharge curve tests, the VRFB single cell employing the m-WON demonstrates high voltage and energy efficiencies, high specific capacity and low capacity loss rate. The excellent results of m-WON are due to the reasons like (i) reduced energy band gap, (ii) reaction familiar surface functional groups and (ii) greater electronegativity. ? 2017 Elsevier B.V.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/99331
- DOI
- 10.1016/j.apsusc.2017.07.022
- ISSN
- 0169-4332
- Article Type
- Article
- Citation
- APPLIED SURFACE SCIENCE, vol. 429, page. 187 - 195, 2018-01-31
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