Exploiting high efficient non-noble metal catalysts with low-cost and good stability for oxygen reduction reaction (ORR) is vital for fuel cells and metal-air batteries. In this work, we successfully constructed a novel nanosheets-shaped NiCoO₂ hierarchical structure supported on CMK-3 support (i.e., NiCoO₂@CMK-3 composite) via a facile hydrothermal method. Electrochemical characterization results reveal that the as-prepared NiCoO₂@CMK-3 composite exhibits remarkable ORR electrocatalytic activity with a positive peak potential of 0.81 V (vs. RHE), an onset potential of 0.90 V (vs. RHE), a high current density of 4.10 mA cm⁻² at 0.4 V, and a nearly four-electron reduction pathway, which are comparable to the state-of-the-art Pt/C catalyst with the same mass. In addition, the NiCoO₂@CMK-3 composite possesses excellent methanol-tolerance and electrochemical stability, which are better than Pt/C. The outstanding performance confirms the NiCoO₂@CMK-3 composite as a promising efficient ORR catalyst in fuel cells and metal-air batteries.

开发低成本，高稳定性的高效非贵金属催化剂以进行氧还原反应（ORR）对于燃料电池和金属空气电池至关重要。在这项工作中，我们通过一种简便的水热方法成功地构建了一种新型的纳米片状NiCoO ₂分层结构，该结构被支撑在CMK-3载体（即NiCoO ₂ @ CMK-3复合材料）上。电化学表征结果表明，所制备的NiCoO ₂ @ CMK-3复合材料表现出显着的ORR电催化活性，正峰值电势为0.81 V（vs. RHE），起始电势为0.90 V（vs. RHE），高电流密度为4.10 mA cm ^-2在0.4 V的电压下具有接近四电子的还原途径，这与具有相同质量的最新Pt / C催化剂相当。此外，NiCoO ₂ @ CMK-3复合材料具有优异的耐甲醇性和电化学稳定性，优于Pt / C。优异的性能证实了NiCoO ₂ @ CMK-3复合材料是燃料电池和金属空气电池中有希望的高效ORR催化剂。