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High electricity generation and COD removal from cattle wastewater in microbial fuel cells with 3D air cathode employed non-precious Cu2O/reduced graphene oxide as cathode catalyst
- Xin, Shuaishuai, Shen, Jianguo, Liu, Guocheng, Chen, Qinghua, Xiao, Zhou, Zhang, Guodong, Xin, Yanjun
- Energy 2020 v.196 pp. 117123
- air, catalysts, catalytic activity, cathodes, cattle, chemical oxygen demand, copper, cuprous oxide, electric potential difference, electricity generation, graphene, graphene oxide, microbial fuel cells, platinum, porous media, surface area, voltammetry, wastewater, wastewater treatment
- In this study, we synthesized a non-precious Cu₂O decorated reduced graphene oxide composite (Cu₂O/rGO) by a facile and direct reduction strategy and evaluated the electricity generation and COD removal performance of MFCs with Cu₂O/rGO as cathode catalyst in treating cattle wastewater. The Cu₂O/rGO with the mass Cu(Ac)₂/GO ratio of 450:50 exhibited the highest catalytic activity by cyclic voltammetry (CV) experiment. The large surface area (363.9 m² g⁻¹) of Cu₂O/rGO with numerous mesoporous exhibited higher exchange current density (12.38 μA cm⁻²) and lower War-burg impedance (21.82 Ω) comparing with Pt/C (11.99 μA cm⁻², 102.10 Ω), and contributed to 4-electron ORR. Notably, the maximum output voltage, power density and coulombic efficiency of MFC with 3D air cathode employed Cu₂O/rGO catalyst reached 0.165 V, 1362 mW m⁻² and 54.9%, respectively, which were higher than those (0.152 V, 1166 mW m⁻² and 53.5%) with 3D air cathode employed Pt/C catalyst in treating cattle wastewater. Moreover, the average COD removal rate of MFC with Cu₂O/rGO catalyst reached 71.5%, which were higher than those 69.8% with Pt/C catalyst. Generally, the MFC with 3D air cathode employed non-precious Cu₂O/rGO catalyst instead of Pt/C catalysts is a promising method for simultaneous electricity generation and cattle wastewater treatment.