Metal-organic framework (MOF) materials have a topological structure, which helps the reactants to fully contact the active sites. This structure can effectively increase the number of active sites participating in the reaction and enhance their catalytic properties. Therefore, in this work, single metal MOF (Co-MOF), single metal MOF with Cu through electrodeposition (Cu/Co-MOF), and double metal MOF (CuCo-MOF) in the case of the same ligand and metal ion were prepared by a hydrothermal method and electrodeposition, which were then applied in the electrocatalytic oxygen evolution reaction (OER). A group of electrochemical tests showed that as-prepared CuCo-MOF exhibited lowest Rct value, highest electron transfer capability, and the best catalytic performance among the three catalysts. When the current density was 10 mA cm⁻², the overpotential of CuCo-MOF was 0.38 V, and the slope of Tafel curve was 118 mV dec⁻¹. Moreover, the CuCo-MOF had larger TOF values and better electrocatalytic property as compared with the other two MOF materials. Therefore, the self-assembled acicular CuCo-MOF material prepared in this work has the advantages of low overpotential, small initial potential, and good stability.

Scheme 1 Flowchart of CuCo-MOF fabrication and brief schematic of OER. CuCo-MOF were synthesized from Cu(Ac)₂, Co(Ac)₂, and terephthalic acid by hydrothermal method. Through optimal experiments, it was finally determined that the preparation of CuCo-MOF was set at 160 °C for 28 h. The as-prepared CuCo-MOF exhibited good OER performance.

金属有机骨架（MOF）材料具有拓扑结构，可帮助反应物完全接触活性位点。这种结构可以有效地增加参与反应的活性位点的数量并增强其催化性能。因此，在这项工作中，在配体和金属离子相同的情况下，单金属MOF（Co-MOF），通过电沉积通过Cu形成的单金属MOF（Cu / Co-MOF）和双金属MOF（CuCo-MOF）是相同的通过水热法制备和电沉积，然后将其应用于电催化析氧反应（OER）。一组电化学测试表明，所制备的CuCo-MOF在三种催化剂中均表现出最低的Rct值，最高的电子转移能力和最佳的催化性能。当电流密度为10 mA cm时^-2，CuCo-MOF的过电势为0.38 V，Tafel曲线的斜率为118 mV dec ^-1。而且，与其他两种MOF材料相比，CuCo-MOF具有更大的TOF值和更好的电催化性能。因此，本发明制备的自组装针状CuCo-MOF材料具有超电势低，初始电势小，稳定性好的优点。

方案1 CuCo-MOF的制造流程图和OER的简要示意图。通过水热法由Cu（Ac）₂，Co（Ac）₂和对苯二甲酸合成CuCo-MOF 。通过最佳实验，最终确定将CuCo-MOF的制备温度设为160°C 28 h。所制备的CuCo-MOF表现出良好的OER性能。