非晶Nd-Ni-B/NF稀土复合电极材料的制备及其析氢性能

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^-1KOH 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。

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

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.