非晶Nd-Ni-B/NF稀土复合电极材料的制备及其析氢性能

Amorphous Nd-Ni-B/NF Rare Earth Composites:Preparation and HER Electrocatalytic Performance

本研究采用简单的一步化学沉积法制备非晶纳米Nd-Ni-B/NF稀土复合电极并研究其析氢(Hydrogen evolution reaction,HER)性能。通过各种测试方法对纳米电极材料进行物相分析和形貌表征,并探索其电催化析氢性能和稳定性。结果表明,稀土Nd可提高电极的电催化析氢性能,当硝酸钕浓度为3 g·L^(–1)时,恒温35℃下施镀1 h,制备的Nd-Ni-B/NF电极析氢性能最佳。Nd-Ni-B/NF(Nickel foam)电极在1.0 mol·L^(–1)KOH溶液中,20 mA·cm^(–2)电流密度下的析氢过电位仅为180 mV,Tafel斜率为117 mV·dec^(–1),析氢反应由Volmer-Heyrovsky步骤控制。此外,Nd-Ni-B/NF电极具有优越的电化学稳定性,在持续电解12 h或2000次循环伏安测试后,催化剂的活性没有明显衰减。

The amorphous nano-Nd-Ni-B rare earth(RE)alloy catalytic electrode on nickel foam(NF)was prepared by simple one-step electroless deposition method and served as a highly active hydrogen evolution reaction(HER)catalyst.Its microstructure and electrocatalytic HER performance were characterized.The results show that addition of Nd improved the electrocatalytic HER.The preparation conditions were optimized with neodymium nitrate of 3 g·L^(–1),reaction temperature of 35℃ and reaction time of 1 h.The Nd-Ni-B/NF electrode requires an overpotential of only 180 mV to achieve the current density of 20 mA·cm^(–2 )in 1.0 mol·L^(–1) KOH solution,and the corresponding Tafel slope is 117 mV·dec^(–1).HER of Nd-Ni-B/NF catalyst is controlled by Volmer-Heyrovsky step.Moreover,the Nd-Ni-B/Nf shows superior electrochemical stability,12 h chronoamperometry and 2000 sweeps of cyclic voltammetry with no obvious activity decay.