Cobalt Based Nanoparticles Embedded Reduced Graphene Oxide Aerogel for Hydrogen Evolution Electrocatalyst
- Cobalt Based Nanoparticles Embedded Reduced Graphene Oxide Aerogel for Hydrogen Evolution Electrocatalyst
- 오영탁; 구성환; 리동준; 윤태영; 최동성; 이경은; 이길용; 임준원; 수지트라 사시칼라; 이호진; 김인호; 정홍주; 리샵 쟈인; 김상욱
- Issue Date
- Particle & particle systems characterization : measurement and description of particle properties and behavior in powders and other disperse systems
- VOL 36, NO 7-1900090-7
- Efficient water electrolysis catalyst is highly demanded for the production of hydrogen as a sustainable energy fuel. It is reported that cobalt derived nanoparticle (CoS2, CoP, CoS|P) decorated reduced graphene oxide (rGO) composite aerogel catalysts for highly active and reliable hydrogen evolution reaction electrocatalysts. 7 nm level cobalt derived nanoparticles are synthesized over graphene aerogel surfaces with excellent surface coverage and maximal expose of active sites. CoS|P/rGO hybrid aerogel composites show an excellent catalytic activity with overpotential of approximate to 169 mV at a current density of approximate to 10 mA cm(-2). Accordingly, efficient charge transfer is attained with Tafel slope of approximate to 52 mV dec(-1) and a charge transfer resistance (R-ct) of approximate to 12 omega. This work suggests a viable route toward ultrasmall, uniform nanoparticles decorated graphene surfaces with well-controlled chemical compositions, which can be generally useful for various applications commonly requiring large exposure of active surface area as well as robust interparticle charger transfer.
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