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High performance catalyst for electrochemical hydrogen evolution reaction based on SiO2/WO3-x nanofacets

Title
High performance catalyst for electrochemical hydrogen evolution reaction based on SiO2/WO3-x nanofacets
Authors
Ketpang, K[Ketpang, Kriangsak]Kim, M[Kim, Minsun]Kim, S[Kim, Soonhyun]Shanmugam, S[Shanmugam, Sangaraju]
DGIST Authors
Ketpang, K[Ketpang, Kriangsak]; Kim, M[Kim, Minsun]; Kim, S[Kim, Soonhyun]Shanmugam, S[Shanmugam, Sangaraju]
Issue Date
2013-08-06
Citation
International Journal of Hydrogen Energy, 38(23), 9732-9740
Type
Article
Article Type
Article
Keywords
Air AtmosphereAnnealingAnnealing TimeCalcinationElectrocatalystElectrocatalystsElectrochemical StabilitiesElectrospinningHydrogenHydrogen Evolution ReactionHydrogen Evolution ReactionsKeggin StructureNanocrystalsNanofibersPolyacrylonitrile NanofibersSilicotungstic AcidTungsten Oxide
ISSN
0360-3199
Abstract
The electrochemical hydrogen evolution reaction (HER) was studied over silica/tungsten oxide nanofacets (SiO2/WO3-x) that was prepared by calcinations of electrospun polyacrylonitrile nanofibers containing silicotungstic acid under air atmosphere. It was found that the Keggin structure of precursor (H4SiW12O40.29H2O) was decomposed and transferred to crystalline monoclinic WO3 after calcinations at 500 C. The morphology of prepared catalyst after pyrolysis, observed by FE-SEM, was nanocrystals deposited on joined nanoparticles fiber. The size of nanocrystal increases with increasing annealing time. In addition, increasing annealing time also enhances interaction between SiO2 and WO3-x. The synthesized catalyst was employed as an electrocatalyst for HER. It was found that the catalyst annealed at 500 C for 5 h showed 6.6 times higher HER activity than the bulk WO3 and exhibits excellent electrochemical stability over 100 cycles. Copyright © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/3214
DOI
10.1016/j.ijhydene.2013.05.112
Publisher
Elsevier Ltd
Related Researcher
Files:
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Collection:
Division of Nano∙Energy Convergence Research1. Journal Articles
Smart Textile Convergence Research Group1. Journal Articles


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