The high cost, scarcity, and poor stability of precious-metal-based catalysts have hindered their extensive application in energy conversion and storage. This stimulates the search for earth-abundant alternatives to replace noble metal electrocatalysts. Hence, in this study, we investigate a novel and low-cost bifunctional electrocatalyst consisting of ZnCoMnO₄ anchored on nitrogen-doped graphene oxide (ZnCoMnO₄/N-rGO). Benefiting from the strong Co-N interaction in ZnCoMnO₄ and the coupled conductive N-rGO, the catalysts exhibit high electrocatalytic activity. Moreover, density functional theory calculations support the dominant role of the strong Co-N electronic interaction, which leads to ZnCoMnO₄/N-rGO having more favorable binding energies with O₂ and H₂O, resulting in fast reaction kinetics. The obtained ZnCoMnO₄/N-rGO electrocatalyst exhibits superb bifunctional activity, with a half-wave potential of 0.83 V for the oxygen reduction reaction and a low onset potential of 1.57 V for the oxygen evolution reaction in 0.1 M KOH solution. Furthermore, a Zn-air battery driven by the ZnCoMnO₄/N-rGO catalyst shows remarkable discharge/charge performance, with a power density of 138.52 mW cm^-2 and long-term cycling stability for 48 h. This work provides a promising multifunctional electrocatalyst based on non-noble metals for the storage and conversion of renewable energy.

贵金属基催化剂的高成本，稀缺性和差的稳定性阻碍了它们在能量转换和存储中的广泛应用。这刺激了人们寻找富含地球的替代品以替代贵金属电催化剂的需求。因此，在这项研究中，我们研究了一种新型的低成本双功能电催化剂，该催化剂由锚定在氮掺杂氧化石墨烯（ZnCoMnO ₄ / N- rGO）上的ZnCoMnO ₄组成。得益于ZnCoMnO _4中强的Co-N相互作用和耦合的导电N-rGO，该催化剂具有较高的电催化活性。此外，密度泛函理论计算支持强Co-N电子相互作用的主导作用，从而导致ZnCoMnO ₄/ N-rGO与O ₂和H ₂ O具有更有利的结合能，从而加快了反应动力学。所得的ZnCoMnO ₄ / N- rGO电催化剂显示出极好的双功能活性，在0.1M KOH溶液中氧还原反应的半波电势为0.83V，氧析出反应的低波起始电势为1.57V。此外，由ZnCoMnO ₄ / N- rGO催化剂驱动的Zn-空气电池显示出显着的放电/充电性能，功率密度为138.52 mW cm ^-2，并具有48 h的长期循环稳定性。这项工作提供了一种有前景的基于非贵金属的多功能电催化剂，用于存储和转化可再生能源。