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Cobalt ferrite microspheres as a biocompatible anode for higher power generation in microbial fuel cells
- Cobalt ferrite microspheres as a biocompatible anode for higher power generation in microbial fuel cells
- Rethinasabapathy, Muruganantham; Vilian, A. T. Ezhil; Hwang, Seung Kyu; Kang, Sung-Min; Cho, Youngjin; Han, Young-Kyu; Rhee, Jin-Kyu; Huh, Yun Suk
- Ewha Authors
- SCOPUS Author ID
- Issue Date
- Journal Title
- JOURNAL OF POWER SOURCES
- JOURNAL OF POWER SOURCES vol. 483
- Cobalt ferrite; Extracellular electron transfer; Escherichia coli; Microbial fuel cell; Power density
- SCIE; SCOPUS
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- In the present study, spinel cobalt ferrite hierarchical flower-like microspheres (CoFe2O4-MS) are fabricated using a hydrothermal method and utilized as a biocompatible anode in microbial fuel cells (MFCs) for power generation. A maximum power density of 1964 mW m(-2) is achieved with CoFe2O4-MS in a mediator-less MFC using Escherichia coli as a biocatalyst and glucose as a fuel. The unprecedented power generation by CoFe2O4-MS can be attributed to (i) the morphology of the flower-like CoFe2O4-MS, with a rough surface and large surface area suitable for biofilm formation, (ii) the rapid immobilization of negatively charged E. coli cells on the positively charged CoFe2O4-MS, facilitating stronger bacterial adhesion between the bacterial cells and CoFe2O4-MS, which leads to lower contact resistance and advantageous interfacial properties with rapid electron transfer, and, more importantly, (iii) enhanced interfacial charge transfer due to the presence of multi-valent cations and multiple valence states in the highly electrocapacitive CoFe2O4-MS. Thus, the enrichment of electroactive E. coli on CoFe2O4-MS produces a large number of electron-shuttling endogenous redox mediators, which promotes efficient extracellular electron transfer between E. coli and the electrocapacitive CoFe2O4-MS during the oxidation of the substrate, thus generating higher power output.
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