Herein, a class of Co₃S₄@Co₃O₄/NSC (N, S-doped carbon) composites with core@shell nanostructures were facilely fabricated through a two-step pyrolysis-oxidation strategy using methyl orange and cobalt chloride as raw materials. By constructing heterointerfaces between different components and controlling the surface oxidation degree, the interfacial and synergistic effects endowed the composited catalysts tailorable and excellent bifunctional electrocatalytic activities on oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). A rechargeable Zn-air battery (ZAB) with the optimized catalyst Co₃S₄@Co₃O₄/NSC-260-8 as air cathode has shown excellent performance with a high specific capacity of 885 mAh·g_Zn⁻¹ and energy density of 948 Wh·kg_Zn⁻¹ (at 20 mA·cm⁻²), which is higher than 836 mAh·g_Zn⁻¹ and 929 Wh·kg_Zn⁻¹ of the one employing Pt/C (20%) + RuO₂ as air cathode under the same conditions. The catalyst also showed robust stability and no obvious decrease in the voltage was observed after 200 h charging and discharging cycles. This work presents a feasible concept to design and construct heterostructural and multifunctional composite catalysts with heterointerfaces.

在此，以甲基橙和氯化钴为原料，通过两步热解-氧化策略轻松制备了一类具有核@壳纳米结构的 Co ₃ S ₄ @Co ₃ O ₄ /NSC（N，S 掺杂碳）复合材料材料。通过在不同组分之间构建异质界面并控制表面氧化程度，界面和协同效应赋予复合催化剂可定制和优异的双功能电催化活性，用于氧还原反应（ORR）和析氧反应（OER）。具有优化催化剂 Co ₃ S ₄ @Co ₃ O _{4的可充电锌空气电池 (ZAB)}/NSC-260-8作为空气正极表现出优异的性能，比容量高达885 mAh·g _Zn ^-1，能量密度高达948 Wh·kg _Zn ^-1 (at 20 mA·cm ^-2 )，高于比相同条件下采用Pt/C（20%）+RuO ₂作为空气阴极的836 mAh·g _Zn ^-1和929 Wh·kg _Zn ^-1高。该催化剂还表现出稳健的稳定性，在 200 小时的充电和放电循环后没有观察到电压明显下降。这项工作提出了一个可行的概念来设计和构建具有异质界面的异质结构和多功能复合催化剂。