铁镍磷化物电极材料的制备及电催化析氢性能

为了解决电解水析氢过程中所用贵金属材料的高昂成本问题，采用水热-低温磷化法制备了一种低廉、环保、高效的析氢催化剂Fe_xNi_1-x-P。与传统制备方法比较，该方法在水热合成前驱体过程中，利用镍盐和铁盐与无水乙醇发生氧化还原反应，生成的OH^-可以沉淀金属离子，随后前驱体与NaH₂PO₂低温磷化制得Fe_xNi_1-x-P。通过研究发现，Fe_0.5Ni_0.5-P电极材料表现出优异的催化活性。在1.0 mol·L^-1 KOH溶液中，电流密度为10 mA·cm^-2时，电极Fe_0.5Ni_0.5-P需要的过电位仅为113 mV，1 000圈循环伏安测试后，极化曲线无明显衰减。提供了一种制备Fe_xNi_1-x-P的简便方法，为开发清洁能源系统的环境友好型催化剂提供了新思路。

Preparation and Electrocatalytic Hydrogen Evolution Performance of Iron-nickel Phosphide Electrode

In order to solve the high cost of precious metal materials used in the process of hydrogen evolution reaction, a kind of iron-nickel phosphide (Fe_xNi_1-x-P) with low-cost, environmental protection and high-efficiency catalysts were prepared by hydrothermal-low temperature phosphating method. Compared with traditional preparation method, the redoxed reactions of nickel salt and iron salt with ethanol were used during hydrothermal synthesizing the precursors in the method. The generated OH^- could be used to precipitate metal ions. Subsequently, Fe_xNi_1-x-P was synthesized by low temperature phosphating of precursor and NaH₂PO₂. It is found that Fe_0.5Ni_0.5-P electrode material shows excellent catalytic activity. The over potential of Fe_0.5Ni_0.5-P electrode is only 113 mV in 1.0 mol·L^-1 KOH solution under the current density of 10 mA·cm^-2. After 1 000 cycles of cyclic voltammetry, the polarization curve does not show obvious attenuation. The method for preparing Fe_xNi_1-x-P is convenient, which provides a new idea for developing environmentally friendly catalysts for clean energy system.