低成本电催化剂的发展,效率高,长期耐久性对于推进绿色制氢至关重要。过渡金属磷化物(TMPs)已被证明是有效的电催化剂,而改善TMPs的性能和耐用性仍然是一个巨大的挑战。采用常压化学气相沉积(APCVD)和磷化,制备了具有可控氧成分(O-FeP/Ti)的FeP/Ti电极。这种对氧含量的控制微调了催化剂的电子结构,从而提高表面反应动力学和催化活性。优化的O-FeP-400/Ti在0.5MH2SO4和1MKOH中在-10mAcm-2下表现出出色的HER活性,超电势为142和159mV,分别。值得注意的是,所获得的O-FeP/Ti阴极在酸性电解质中也显示出高达200小时的显著耐久性,同时表面形貌保持完整。第一次,在复合电极中发现了低价氧化钛(Ti3O)中间层,并归因于Ti基材与表面O-FeP催化剂之间的优越连接,得到实验结果和密度泛函理论(DFT)分析的支持。这项工作扩大了过渡金属磷化物(TMPs)的潜在应用,高效耐用的水分解催化剂。
The development of electrocatalysts with low cost, high efficiency, and long-term durability is crucial for advancing green hydrogen production. Transition metal phosphides (TMPs) have been proved to be efficient electrocatalyst, while the improvement in the performance and durability of the TMPs remains a big challenge. Employing atmospheric pressure chemical vapor deposition (APCVD) and phosphorization,
FeP/Ti electrodes are fabricated featuring controllable oxygen ingredients (O-
FeP/Ti). This manipulation of oxygen content fine-tunes the electronic structure of the catalyst, resulting in improved surface reaction kinetics and catalytic activity. The optimized O-
FeP-400/Ti exhibits outstanding HER activity with overpotentials of 142 and 159 mV at -10 mA cm-2 in 0.5 M H2SO4 and 1 M KOH, respectively. Notably, the obtained O-
FeP/Ti cathode also displays remarkable durability of up to 200 h in acidic electrolyte with surface topography remaining intact. For the first time, the low-valence titanium oxide (Ti3O) interlayer is identified in the composite electrode and ascribed for the superior connection between Ti substrate and the surface O-
FeP catalyst, as supported by experimental results and density functional theory (DFT) analysis. This work has expanded the potential applications of transition metal phosphides (TMPs) as a cost-effective, highly efficient and durable catalyst for water splitting.