| Popis: |
Recently, metal-organic framework (MOF), as a non-noble metal material, has been widely studied for its great potential in catalysis. In this work, a group of hydrothermal growth of CoCu bimetallic active center organic frameworks on three-dimensional graphene sponge (3DGS-CoCu-MOF) were designed, and fabricated as an electrocatalyst for oxygen evolution reaction (OER). A series of electrochemical experiments showed that in the 0.1 mol L−1 KOH electrolyte, the overpotential of the optimal 3DGS-Co3.0Cu1.0-MOF was 460 mV, the slope of Tafel curve was 172 mV dec−1, the charge transfer resistance (Rct) was16.38 Ω cm−2, ECSA was 12.5 cm−2, and Rf was 176.06. After the test of 20000 s, the current density still maintains 95.07%. The better electrocatalytic performance and the long-term electrochemical durability indicated that the 3DGS-Co3.0Cu1.0-MOF material possessed good OER performance. The optimal 3DGS-Co3.0Cu1.0-MOF employed three-dimensional graphene sponge as the conductive substrate, bimetallic active center acted as the main body of the catalyst, and made full use of the synergistic effect of the bimetallic center. Therefore it is a promising catalyst material for the electrolysis of water. |
Full Text from ScienceDirect