1778
Kinetic Study of the Oxygen Reduction Reaction on Alpha-Ni(OH)2 and Alpha-Ni(OH)2 Supported on Graphene Oxide

Thursday, 2 June 2016: 10:20
Sapphire Ballroom M (Hilton San Diego Bayfront)

ABSTRACT WITHDRAWN

Development of active non-noble metal catalysts for the oxygen reduction reaction is critical for a range of electrochemical energy storage and conversion technologies.  We have recently discovered that alpha nickel hydroxide supported on graphene oxide (α-Ni(OH)2/GO) displays  surprising activity for the oxygen reduction reaction in alkaline media.  In comparison to α-Ni(OH)2 alone or graphene oxide alone, α-Ni(OH)2/GO possesses a lower onset potential, lower peak current potential, and higher peak current density, suggesting a synergy between the GO support and the α-Ni(OH)2 particles.  To investigate the origin of this synergy, we present a comprehensive kinetic analysis of the supported and unsupported α-Ni(OH)2 catalyst.  Rotating disk electrode linear sweep voltammetry furnishes electron transfer numbers, kinetic rate constants, and reaction orders which provide preliminary evidence for similar elementary steps occurring on supported and unsupported α-Ni(OH)2, but modifications in activity arising from differences in the activation energy for adsorption of O2 and of reaction intermediates.