The development of cost-efficient and long-term stable catalysts for the oxygen evolution reaction (OER) is crucial to produce clean and sustainable H₂ fuels from water. Here we demonstrate a cobalt vanadium oxide (CoVOx-300) working as such an efficient and durable electrocatalyst. Such an active catalyst is beneficial from the balanced Co³⁺-O-V⁴⁺ active species, which show the high surface Co³⁺ contents with matched V⁴⁺ generated by rapid heat treatment. The CoVOx-300 with highest Co³⁺/Co²⁺ ratio of 1.4 and corresponding highest V⁴⁺/ V⁵⁺ ratio of 1.7 exhibits remarkable OER activity with an overpotential of 330 mV at current density of 10 mA cm⁻² (η₁₀), a shallow Tafel slope of only 46 mV dec^-1 and a current density of 100 mA cm⁻² at an overpotential of 0.38 V vs RHE, which is 20 times higher than the active CoOx-300 and 1000 times higher than VOx-300. The catalyst also shows excellent stability for 10 h in alkaline media and a 40 % reduced activation energy to the counterpart, CoOx-300. The overpotential (η₁₀) of CoVOx-300 also shows nearly 70 and 80 mV lower than the corresponding CoOx-300 and CoVOx catalysts, respectively and 20 % lower Tafel slope than the commercial benchmark catalyst RuO₂. Thus, this study for the first time demonstrates that surface Co³⁺-O-V⁴⁺ species play a crucial role in improving electrocatalytic properties and stability for water oxidation reaction and the approaches allow the rational design and synthesis of other active transition metal oxides toward efficient OER activity.

氧气释放反应（OER）的经济高效且长期稳定的催化剂的开发对于从水中生产清洁，可持续的H ₂燃料至关重要。在这里，我们演示了钴钒氧化物（CoVOx-300）作为一种有效且耐用的电催化剂。这种活性催化剂受益于平衡的Co ³⁺ -OV ⁴⁺活性物质，该活性物质显示出高的表面Co ³⁺含量和通过快速热处理产生的匹配的V ⁴⁺。CoVOx-300的最高Co ³⁺ / Co ²⁺比为1.4，并且对应的最高V ⁴⁺ / V ⁵⁺用的超电势330毫伏的1.7显着表现出OER活性比率以10mA厘米的电流密度^-2（η ₁₀），只有46毫伏分解的浅表塔菲尔斜率^-1和100毫安cm 2的电流密度^-2以相对于RHE的过电势为0.38 V ，这比有源CoOx-300高20倍，比VOx-300高1000倍。在碱性介质中，该催化剂在10小时内还具有出色的稳定性，相对于CoOx-300，其活化能降低了40％。超电势（η ₁₀的科沃斯-300也示出了）近70和80毫伏分别低于相应COOX-300和科沃斯催化剂，和20％的降低塔菲尔斜率比商业基准催化剂的RuO ₂。因此，这项研究首次证明，表面Co ³⁺ -OV ⁴⁺物种在改善水氧化反应的电催化性能和稳定性方面起着至关重要的作用，并且该方法可以合理设计和合成其他活性过渡金属氧化物，从而有效地提高效率。 OER活动。