LAUSR

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. Graphical abstract 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. 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.