Bimetallic phosphides may potentially benefit from the synergetic effects of two metallic elements for enhanced performances. For example, a nickel cobalt phosphide (NiCoP), in which Ni promotes the electrochemical activity of the materials while Co can reduce the charge transfer resistance, may potentially achieve remarkable performance in an alkaline aqueous zinc battery (AZB). However, the main challenge of bimetallic phosphides lies in the unsatisfactory electrochemical stability caused by their easy oxidization. Here we found sulfur-doping to bimetallic nickel cobalt phosphide (S-NiCoP) can effectively get its surface passivation suppressed. As a result, the S-NiCoP electrode exhibits a remarkable area specific capacity (1.32 mAh cm⁻²) and an ultra-long lifespan (capacity retention of 160% after 8000 cycles) in an AZB. The reaction mechanism is further revealed to be a reversible redox reaction from NiCoP to NiP_xOH and CoP_1-xOH. Furthermore, a quasi-solid-state S-NiCoP//Zn battery is fabricated. It performs well under various conditions (bending, washing, cutting) and delivers high energy density (21.5 mW h cm⁻³) and power density (336.84 mW cm⁻³). This work provides a general approach to stabilize bimetallic phosphides and opens a door to utilize the synergetic effects of various bimetallic phosphides for aqueous batteries.

双金属磷化物可能会受益于两种金属元素的协同​​作用以增强性能。例如，其中镍促进材料的电化学活性而钴可降低电荷转移阻力的磷化镍钴钴（NiCoP）可能在碱性水锌电池（AZB）中获得显着性能。然而，双金属磷化物的主要挑战在于由于其易于氧化而导致的令人满意的电化学稳定性。在这里，我们发现硫掺杂到双金属磷化钴镍（S-NiCoP）可以有效地抑制其表面钝化。结果，S-NiCoP电极表现出显着的面积比容量（1.32mAh cm ^-2）。）和AZB中的超长寿命（8000次循环后容量保持率达到160％）。进一步揭示该反应机理是从NiCoP到NiP _x OH和CoP _1-x OH的可逆氧化还原反应。此外，制造了准固态S-NiCoP // Zn电池。它在各种条件下（弯曲，清洗，切割）表现良好，并提供高能量密度（21.5 mW h cm ^-3）和功率密度（336.84 mW cm ^-3）。这项工作提供了一种稳定双金属磷化物的通用方法，并为利用各种双金属磷化物的协同作用打开了大门。