Transition metal phosphides have emerged as alternative electrocatalysts for hydrogen evolution reaction (HER) due to their high activity and low cost compared to the conventional HER electrocatalysts such as Pt. However, the dependency of HER activity on different crystal phases is not well-understood. Here, we synthesized iron phosphide nanoparticles with two distinct phases via chemical transformation from iron metal to iron phosphides. During the development of iron phosphide phases by varying the synthesis conditions such as reaction temperature and time, the HER activities of the nanoparticle were examined. The HER activities of the iron phosphide nanoparticles were found to be phase-dependent.

过渡金属磷化物由于与传统的HER电催化剂（例如Pt）相比具有较高的活性和较低的成本，已成为氢释放反应（HER）的替代电催化剂。但是，HER活性对不同晶相的依赖性尚不十分清楚。在这里，我们通过从铁金属到磷化铁的化学转化合成了具有两个不同相的磷化铁纳米粒子。在通过改变合成条件（例如反应温度和时间）开发磷化铁相的过程中，检查了纳米粒子的HER活性。发现磷化铁纳米颗粒的HER活性是相位依赖性的。