Abstract
To improve the power generation of the microbial fuel cell, activated carbon is modified by the Co3O4/NiCo2O4 double-shelled nanocage, which prepared via a metal-organic framework method. When tested as cathodic material, the mesoporous Co3O4/NiCo2O4 double-shelled nanocage with a large surface (112.9 m2 g−1) exhibits higher open circuit potential (0.252 V) and higher exchange current density (19.70 × 10−4 A cm−2). Moreover, the maximum power density of the air-cathode microbial fuel cell equipped with the 5% as-prepared catalyst is 1810 mW m−2, 104% higher than the control. The morphology and crystal structure of Co3O4/NiCo2O4 are investigated by the Transmission electron microscope and X-ray diffraction. X-ray photoelectron spectroscopy analysis indicates that there exists Co3+/Co2+ and Ni3+/Ni2+ redox couples in the catalyst, and divalence - trivalence - divalence redox cycles contribute to the improved oxygen reduction reaction performance and enhanced power output. Owing to the structural merits and improved electrochemical activity, the synthesized Co3O4/NiCo2O4 double-shelled nanocage would be considered as a replacement of the new material for Pt in microbial fuel cell.
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