以碳纤维纸(Carbon Fiber,CF)为基底,通过可控电沉积制备了PtIr/CF双功能催化电极,并对其在氨水制氢中的电催化性能进行研究。结果表明,Pt、Ir均匀沉积在基底纤维骨架上,呈花簇状分布,表面形成的针形纳米枝晶为催化反应提供丰富的活性位点。当其用作氨氧化反应(Ammonia Oxidation Reaction,AOR)的阳极时,在1.5 mol/L KOH+1.5 mol/L NH₃的混合电解液中,PtIr/CF催化电极显示出0.39 V (vs.RHE)的AOR起始电位和134.4 mA/cm²的电流密度;而当其作为阴极用于析氢反应(Hydrogen Evolution Reaction,HER)时,PtIr/CF催化电极在0.121 V (vs.RHE)的电压下实现了100 mA/cm²的析氢性能,并显示出优于Pt/CF电极的电催化性能和稳定性。

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.

王中华(1997-),男,硕士生,研究方向为电催化分解氨,2319895610@qq.com。