期刊
JOURNAL OF POWER SOURCES
卷 195, 期 9, 页码 2586-2591出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2009.10.084
关键词
Microbial fuel cells; Manganese dioxides; Octahedral molecular sieves; Oxygen reduction reaction
资金
- Chemical Sciences, Geosciences, and Biosciences Division of the Office of Basic Energy Sciences, and Office of Science
- U.S. Department of Energy
This study focused on manganese oxides with a cryptomelane-type octahedral molecular sieve (OMS-2) structure to replace platinum as a cathode catalyst in microbial fuel cells (MFCs). Undoped (ud-OSM-2) and three catalysts doped with cobalt (Co-OMS-2), copper (Cu-OMS-2), and cerium (Ce-OMS-2) to enhance their catalytic performances were investigated. The novel OMS-2 cathodes were examined in granular activated carbon MFC (GACMFC) with sodium acetate as the anode reagent and oxygen in air as the cathode reagent. The results showed that after 400 h of operation, the Co-OMS-2 and Cu-OMS-2 exhibited good catalytic performance in an oxygen reduction reaction (ORR). The voltage of the Co-OMS-2 GACMFC was 217 mV, and the power density was 180 mW m(-2). The voltage of the Cu-OMS-2 GACMFC was 214 mV and the power density was 165 mW m(-2). The internal resistance (R-in) of the OMS-2 GACMFCs (18 +/- 1 Omega) was similar to that of the platinum GACMFCs (17 Omega). Furthermore, the degradation rates of organic substrates in the OMS-2 GACMFCs were twice those in the platinum GACMFCs, which enhance their wastewater treatment efficiencies. This study indicated that using OMS-2 manganese oxides to replace platinum as a cathodic catalyst enhances power generation, increases contaminant removal, and substantially reduces the cost of MFCs. Published by Elsevier B.V.
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