Structure modulation of transition metal phosphides at the atomic scale can significantly modify their catalytic properties. Herein, stacking faults abundant Ni₂P/Co₂P electrocatalysts with outstanding bifunctional oxygen evolution and hydrogen evolution property have been prepared. The stacking faults are formed by slow dissolution of Ni substrate by Mo⁶⁺ and further redeposition of Ni²⁺ during the growth of Co(OH)F crystals. Unprecedentedly, the distinct mechanistic etching-redeposition pathway dictated by the stacking faults, heterostructures and crystal lattice deformation leads to lattice expansion of Co₂P and enables preferred reactants adsorption. Electrolysis cell employing Ni₂P/Co₂P electrocatalysts as a bifunctional catalyst for both the cathode and the anode delivers a current density of 10 mA cm⁻² at a cell voltage of 1.57 V, which is comparable to the integrated Pt/C and IrO₂ counterparts. The exceptional electrocatalytic performance of Co₂P/Ni₂P-x%Mo indicates the redeposition mechanism a new methodology to modulate the structure and surface reactivity of electrocatalysts.

过渡金属磷化物在原子尺度上的结构调节可以显着改变其催化性能。在此，制备了具有丰富的双功能氧放出和氢放出特性的Ni ₂ P / Co ₂ P电沉积催化剂。堆垛层错是由Mo ⁶⁺缓慢溶解Ni底物并在Co（OH）F晶体生长过程中进一步重新沉积Ni ^2+形成的。前所未有的是，由堆垛层错，异质结构和晶格变形所决定的独特的机械刻蚀-再沉积途径会导致Co ₂ P的晶格膨胀，并使优选的反应物吸附成为可能。采用Ni _2的电解槽作为阴极和阳极的双功能催化剂的P / Co ₂ P电催化剂在1.57 V的电池电压下可提供10 mA cm ^-2的电流密度，与集成的Pt / C和IrO ₂相当。Co ₂ P / Ni ₂ P-x％Mo优异的电催化性能表明了再沉积机理是调节电催化剂结构和表面反应性的新方法。