Zinc–air batteries (ZABs) are promising as energy storage devices owing to their high energy density and the safety of electrolytes. Construction of abundant triple-phase boundary (TPB) effectively facilitates cathode reactions occurring at TPB. Herein, a wood-derived integral air electrode containing Co/CoO nanoparticles and nitrogen-doped carbonized wood (Co/CoO@NWC) is constructed with a dual catalytic function. The potential gap between oxygen reduction and evolution is shortened to 0.77 V. Liquid ZABs using Co/CoO@NWC as cathode exhibit high discharge specific capacity (800 mAh g_Zn⁻¹), low charge–discharge gap (0.84 V), and long-term cycling stability (270 h). Co/CoO@NWC also shows distinguished catalytic activity and stability in all-solid-state ZABs. The inherent layered porous and pipe structures of wood are well maintained in catalytically active carbon. The different hydrophilicity of carbonized wood and Co/CoO endow abundant TPBs for battery reaction. The Co/CoO located on TPB provides main active sites for oxygen reactions. The inherent pipe structures of wood carbon and the interaction between Co/CoO and NWC effectively prevent nanoparticles from aggregation. The design and preparation of this monolithic electrocatalyst contribute to the broad-scale application of ZABs and promote the development of next-generation biomass-based storage devices.

中文翻译：

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用于可充电锌空气电池中增强界面电催化的木材衍生整体空气电极

锌-空气电池（ZAB）由于其高能量密度和电解质的安全性而被用作储能装置。丰富的三相边界（TPB）的构建有效地促进了在 TPB 发生的阴极反应。在此，构建了一种含有 Co/CoO 纳米颗粒和氮掺杂碳化木材 (Co/CoO@NWC) 的木材衍生整体空气电极，具有双重催化功能。氧还原和析出之间的电位差缩短至 0.77 V。使用 Co/CoO@NWC 作为阴极的液态 ZAB 表现出高放电比容量（800 mAh g _Zn ^-1)、低充放电间隙 (0.84 V) 和长期循环稳定性 (270 h)。Co/CoO@NWC 在全固态 ZAB 中也显示出卓越的催化活性和稳定性。木材固有的层状多孔结构和管状结构在催化活性碳中得到很好的保持。炭化木材和 Co/CoO 的不同亲水性赋予了丰富的 TPB 用于电池反应。位于 TPB 上的 Co/CoO 为氧反应提供了主要的活性位点。木碳固有的管状结构以及 Co/CoO 和 NWC 之间的相互作用有效地防止了纳米颗粒的聚集。这种单片电催化剂的设计和制备有助于ZABs的广泛应用，促进下一代基于生物质的存储装置的发展。