Kim, Byung Hong Lim, Swee Su Daud, Wan Ramli Wan Gadd, Geoffrey Michael Chang, In Seop 2024-01-20T06:31:53Z 2024-01-20T06:31:53Z 2022-01-25 2015-08 0960-8524 https://pubs.kist.re.kr/handle/201004/125153 The cathode reaction is one of the most important limiting factors in bioelectrochemical systems even with precious metal catalysts. Since aerobic bacteria have a much higher affinity for oxygen than any known abiotic cathode catalysts, the performance of a microbial fuel cell can be improved through the use of electrochemically-active oxygen-reducing bacteria acting as the cathode catalyst. These consume electrons available from the electrode to reduce the electron acceptors present, probably conserving energy for growth. Anaerobic bacteria reduce protons to hydrogen in microbial electrolysis cells (MECs). These aerobic and anaerobic bacterial activities resemble those catalyzing microbially-influenced corrosion (MIC). Sulfate-reducing bacteria and homoacetogens have been identified in MEC biocathodes. For sustainable operation, microbes in a biocathode should conserve energy during such electron-consuming reactions probably by similar mechanisms as those occurring in MIC. A novel hypothesis is proposed here which explains how energy can be conserved by microbes in MEC biocathodes. (C) 2015 Elsevier Ltd. All rights reserved. English ELSEVIER SCI LTD The biocathode of microbial electrochemical systems and microbially-influenced corrosion Article 10.1016/j.biortech.2015.04.084 1 BIORESOURCE TECHNOLOGY, v.190, pp.395 - 401 BIORESOURCE TECHNOLOGY 190 395 401 N scie scopus 000355200200052 2-s2.0-84930178434 Agricultural Engineering Biotechnology & Applied Microbiology Energy & Fuels Agriculture Biotechnology & Applied Microbiology Energy & Fuels Review FUEL-CELLS OXYGEN REDUCTION ELECTRICITY-GENERATION HYDROGEN-PRODUCTION AUTOTROPHIC DENITRIFICATION PERCHLORATE REDUCTION ELECTROLYSIS CELLS GRAPHITE CATHODES WASTE-WATER REMOVAL Biocathode Bioelectrochemical systems Microbially-influenced corrosion Microbial electrolysis cells Energy conservation