%P 1760-1773
%I Elsevier Ltd
%A S. Saha
%A S. Ganguly
%A D. Banerjee
%A K. Kargupta
%V 40
%T Novel bimetallic graphene-cobalt-nickel (G-Co-Ni) nano-ensemble electrocatalyst for enhanced borohydride oxidation
%L scholars6042
%J International Journal of Hydrogen Energy
%O cited By 34
%N 4
%R 10.1016/j.ijhydene.2014.11.143
%D 2015
%K Absorption spectroscopy; Catalyst activity; Catalytic oxidation; Cobalt; Cobalt metallography; Cyclic voltammetry; Electrocatalysts; Fourier transform infrared spectroscopy; Graphene; Ions; Nanocatalysts; Nickel; Nickel metallography; Oxidation, Bimetallic catalysts; Borohydride oxidation; Borohydrides; Cobalt-nickel catalysts; Electroactive surface areas; Electrocatalytic activity; Linear sweep voltammetry; Nano-ensembles, Catalyst supports
%X Electrochemically active bi-metallic nano-ensemble, Graphene-Cobalt-Nickel (G-Co-Ni) is proposed as the electro-catalyst for direct oxidation of BH4- ions. Three nano-hybrid electro-catalysts namely Graphene-Cobalt (G-Co), Graphene-Nickel (G-Ni) and Graphene-Cobalt-Nickel (G-Co-Ni) are synthesized and characterized using XRD, FTIR, Raman's spectroscopy, SEM, HRTEM, EDAX and mass absorption spectroscopy. The electro-catalytic activity of the synthesized catalysts towards the oxidation of BH4- ions was investigated by means of cyclic voltammetry (CV) and linear sweep voltammetry (LSV). Among the different electro-catalysts G-Co-Ni (�4.5:1:1 weight ratio) exhibits the highest value of electroactive surface area (ESA = 518.6 m2/gm). G-Co-Ni shows enhanced mass specific activity (msa: 750-900 A g-1) towards the direct oxidation of BH4- ions and oxidation of H2 generated by catalytic hydrolysis of BH4- ions comparing with G-Ni (msa: 130-160 A g-1) and G-Co (msa: 120-130 A g-1) catalysts. The enhanced electro-catalytic activity is attributed to the increased number of reaction sites and pathways of electron transfer through graphene supported bimetals. © 2014 Hydrogen Energy Publications, LLC.