Rational design of efficient bifunctional air cathodes towards oxygen evolution/reduction reaction is of central importance for energy-efficient metal-air batteries, but remains an ongoing challenge. Here, N element doped NiSe₂ nanosheets in-situ grown on the carbon cloth were prepared via facial hydrothermal synthesis of nickel hydroxide followed by selenization and nitrogen doping treatment. Such self-supported N-doped NiSe₂ nanoarrays (N-NiSe₂/CC) exhibits superior bifunctional catalytic activity and high durability compared with the pristine NiSe₂/CC, which are ascribed to the unique structure after nitrogen doping. Nitrogen doping can provide more electrocatalytical active sites and improve the electronic transport for fast reaction kinetics, which is preferably corroborated with density functional theory calculations and X-ray absorption spectroscopy. As a proof of concept, the solid-state zinc-air batteries assembled by the N-NiSe₂/CC directly as the air cathode present a low overpotential of 0.75 V, remarkable cyclic stability of 30 h with 90 circles, and robust flexibility. Therefore, the N-NiSe₂/CC system proves to be a highly active and reliable electrode for the developing of metal-air batteries, opening up a promising opportunity for high-performance portable electronics.

对于节能的金属空气电池，合理设计有效的双功能空气阴极以实现氧释放/还原反应至关重要，但仍然是一个持续的挑战。在此，通过表面水热合成氢氧化镍，然后进行硒化和氮掺杂处理，制备了在碳布上原位生长的N元素掺杂的NiSe ₂纳米片。与原始NiSe ₂相比，这种自支撑的N掺杂NiSe ₂纳米阵列（N-NiSe ₂ / CC）表现出优异的双功能催化活性和高耐久性。/ CC，这归因于氮掺杂后的独特结构。氮掺杂可提供更多的电催化活性位点并改善电子传递，以实现快速反应动力学，这最好与密度泛函理论计算和X射线吸收光谱法相证实。作为概念证明，由N-NiSe ₂ / CC直接组装为空气阴极的固态锌-空气电池具有0.75 V的低过电势，90 h的30 h出色的循环稳定性以及强大的柔韧性。因此，N-NiSe ₂ / CC系统被证明是用于开发金属空气电池的高活性且可靠的电极，为高性能便携式电子产品打开了广阔的机遇。