Herein, based on the mechanical alloying (MA) and in situ electrochemical etching methods, a series of porous Ni–Fe electrocatalysts with different Ni/Fe atomic ratios derived from intermetallic NiFe aluminides have been designed and applied to OER (oxygen evolution reaction) in alkaline solution. As comparing with bulk NiFe aluminides electrocatalyst, the porous electrocatalyst presents higher activity via the etching method. In addition, among all porous samples with different metal stoichiometric ratios, Ni_2/3Fe_1/3Al shows the highest OER activity with an overpotential of 299 mV at 10 mA cm⁻² and a Tafel slope of 58.9 mV dec⁻¹, which can be attributed to the high intrinsic activity and large electrochemical surface area from the leaching of Al. This work provides a promising route to in situ synthesize highly efficient electrocatalysts for water splitting.

在此，基于机械合金化（MA）和原位电化学蚀刻方法，设计了一系列由金属间NiFe铝化物衍生的具有不同Ni / Fe原子比的多孔Ni-Fe电催化剂，并将其应用于OER（氧释放反应）中。碱性溶液。与块状NiFe铝化物电催化剂相比，多孔电催化剂通过蚀刻法表现出更高的活性。此外，在所有具有不同金属化学计量比的多孔样品中，Ni _2/3 Fe _1/3 Al显示出最高的OER活性，在10 mA cm ^-2下的过电势为299 mV，Tafel斜率为58.9 mV dec ^-1，这可以归因于铝的高内在活性和大的电化学表面积。这项工作为原位合成高效的水分解用电催化剂提供了一条有希望的途径。