PtIr/CF bifunctional catalytic electrodes are prepared through the controlled electrodeposition method by using carbon fiber paper(CF)as the substrate,and their electrocatalytic performance for ammonia to hydrogen is investigated.It is shown that Pt and Ir uniformly deposit on the substrate fiber skeleton with a flower cluster-like distribution,and the needle-shaped nanodendrites formed on the surface provide abundant active sites for the catalytic reaction.When it is used as an anode for Ammonia Oxidation Reaction(AOR),the PtIr/CF catalytic electrode shows an AOR onset potential of 0.39 V(vs.RHE)and a current density of 134.4 mA·cm-2 in a mixed electrolyte of 1.5 mol·L-1 KOH+1.5 mol·L-1 NH3.As it is used as a cathode for Hydrogen Evolution Reaction(HER),the PtIr/CF catalytic electrode achieves a hydrogen evolution performance of 100 mA·cm-2 at 0.121 V(vs.RHE)and shows better electrocatalytic performance and stability than the Pt/CF electrode.
ammonia oxidation reactionhydrogen evolution reactionelectrocatalyticbifunctional electrodeammonia to hydrogen
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