The hybrid battery integrating a typical Zn redox battery and a Zn-air battery is a promising green technology for energy storage, and the cathode integrating the redox reaction and electrocatalytic oxygen reduction is a key point for efficient electrochemical energy conversion. Herein, we report a scalable strategy to fabricate nanoporous Ag₂Al intermetallic compound as a self-standing cathode for the hybrid Zn battery. The abundant surface oxygen species, the Ag-Al intermetallic interaction and the np-Ag₂Al@AgAlO_x interface cooperatively contributed to the catalytic ORR activity. The electrode endows efficient catalytic oxygen reduction (a Tafel slope of 38.0 mV/dec and an onset potential of 0.998 V) and regulated redox activity as compared with Ag. The nanoporous channels allow efficient ion transport, interface charge exchange and gas molecular diffusion. Significantly, the assembled hybrid Zn-Ag₂Al/air battery delivers a high capacity of 3.23 mAh/cm² as compared with recent reports. As far as we know, this is the first exploration for the electrochemical property of Ag₂Al, and it would inspire more exploration in developing multifunctional materials and robust hybrid batteries for practical applications.

集成了典型的Zn氧化还原电池和Zn-空气电池的混合电池是一种有前途的绿色能源存储技术，而将氧化还原反应和电催化氧还原集成在一起的阴极是高效电化学能量转换的关键。在这里，我们报告了一种可扩展的策略来制造纳米多孔Ag ₂ Al金属间化合物作为混合Zn电池的自立阴极。表面氧种类丰富，Ag-Al金属间相互作用和np-Ag ₂ Al @ AgAlO _x界面共同促进了ORR的催化活性。与Ag相比，该电极可实现有效的催化氧还原（Tafel斜率为38.0 mV / dec，起始电位为0.998 V），并具有可调节的氧化还原活性。纳米孔通道可实现有效的离子传输，界面电荷交换和气体分子扩散。值得注意的是，与最近的报道相比，组装好的Zn-Ag ₂ Al /空气混合电池提供了3.23 mAh / cm ²的高容量。据我们所知，这是对Ag ₂ Al电化学性质的首次探索，它将激发更多的探索，以开发用于实际应用的多功能材料和坚固的混合电池。