The realization of membrane-less and decoupled water splitting holds immense significance in facilitating cost-efficient and substantial H₂ supply. In this study, a two-step hydrothermal reaction was employed to synthesize a Co_xNi_1-x(OH)₂@MnO₂ freestanding electrode, utilizing nickel foam (NF) as the substrate, MnO₂ as the seed layer, and Co_xNi_1-x(OH)₂ nanofiber as the surface layer. This fabrication approach resulted in a buffer electrode with an expanded potential window and enhanced charge storage capacity. Notably, the optimized Co_xNi_1-x(OH)₂@MnO₂@NF electrode functioned as an effective charge mediator, successfully decoupling the synchronous oxygen and hydrogen evolution reactions (OER and HER). Consequently, the need for separators was eliminated, introducing a novel two-step water electrolysis hydrogen production technology. Remarkably, the initial HER process at the cathode exhibited robust performance, sustaining a current of 100 mA for an impressive duration of 1500 s. Simultaneously, the Co_xNi_1-x(OH)₂@MnO₂ mediator underwent oxidation, attaining its corresponding oxidation state and yielding a commendable applied potential of 1.564 V. Subsequently, the OER step entailed the revival of the buffer electrode, enabling the facilitated production of anodic O₂ at an operating potential of 0.392 V. Beyond that, the integration of an oxidizing buffer medium and a zinc foil enabled the development of a battery configuration, effectively replacing the second step of OER. This pioneering integration facilitated the concurrent realization of persistent H₂ generation and battery discharging, presenting an innovative approach to hydrogen production that circumvents reliance on an external power supply. Thus, this decoupled HER-OER apparatus offers a propitious strategy for effectively converting renewable resources into hydrogen.

实现无膜和解耦水分解对于促进经济有效且大量的H ₂供应具有重要意义。本研究采用两步水热反应合成了Co _x Ni _1-x (OH) ₂ @MnO ₂独立电极，以泡沫镍(NF)为基底，MnO ₂为种子层，Co _x Ni _1-x (OH) ₂纳米纤维作为表面层。这种制造方法产生了具有扩大的电势窗口和增强的电荷存储容量的缓冲电极。值得注意的是，优化后的 Co _x Ni _1-x(OH) ₂ @MnO ₂ @NF电极作为有效的电荷介体，成功解耦同步析氧和析氢反应（OER和HER）。因此，不再需要分离器，引入了新型两步水电解制氢技术。值得注意的是，阴极的初始 HER 过程表现出强大的性能，可维持 100 mA 的电流长达 1500 秒，令人印象深刻。同时，Co _x Ni _1-x (OH) ₂ @MnO ₂介体发生氧化，达到其相应的氧化态并产生值得称赞的1.564 V的外加电位。OER 步骤需要缓冲电极的复兴，从而能够在 0.392 V 的工作电位下促进阳极 O ₂的产生。除此之外，氧化缓冲介质和锌箔的集成使得电池配置的开发成为可能，有效地取代了OER的第二步。_{这种开创性的集成促进了持续H 2}生成和电池放电的同时实现，提出了一种避免对外部电源依赖的创新制氢方法。因此，这种解耦的 HER-OER 装置提供了一种有效地将可再生资源转化为氢气的有利策略。