Microporous cobaloxime–graphene composite: a reloadable non-noble metal catalyst platform for the proton reduction reaction

Abstract

A heterogeneous catalyst for the proton reduction reaction was constructed through immobilization of cobaloxime, in a microporous solid, atop unmodified graphene sheets through a one-pot reaction. This approach afforded a true heterogeneous catalyst to circumvent the known poor stability of cobaloximes in aqueous solutions. The composite demonstrated significant electrochemical activity and ability to reload the Co ions and with enhanced activity toward proton reduction (an onset of ∼−11 mV and a current density of 9 mA cm⁻² at −0.88 V vs. RHE).