Porous metal-organic framework Cu(BTC) as catalyst used in air-cathode for high performance of microbial fuel cell.

Metal-organic framework Cu(BTC), prepared by an easy hydrothermal method, was used as the oxygen-based catalyst in microbial fuel cell (MFC). The maximum power density of Cu(BTC) modified air-cathode MFC was 1772±15mWm, almost 1.8 times higher than the control. BET results disclosed high specific surface area of 2159.7mg and abundant micropores structure. Regular octahedron and porous surface of Cu(BTC) were observed in SEM. XPS testified the existence of divalent copper in the extended 3D frameworks, which importantly acted as the Lewis-acid sites or redox centers in ORR. Additionally, the total resistance decreased by 42% from 17.60 to 10.24Ω compared with bare AC electrode. The rotating disk electrode test results showed a four-electron transfer pathway for Cu(BTC), which was crucial for electrochemical catalytic activity. All the structural and electrochemical advantages make Cu(BTC) a promising catalyst for ORR in MFC.