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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

Author:
Xin, Shuaishuai, Shen, Jianguo, Liu, Guocheng, Chen, Qinghua, Xiao, Zhou, Zhang, Guodong, Xin, Yanjun
Source:
Energy 2020 v.196 pp. 117123
ISSN:
0360-5442
Subject:
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
Abstract:
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.
Agid:
6841819