Bioanode as a limiting factor to biocathode performance in microbial electrolysis cells

Authors
Lim, Swee SuYu, Eileen HaoDaud, Wan Ramli WanKim, Byung HongScott, Keith
Issue Date
2017-08
Publisher
ELSEVIER SCI LTD
Citation
BIORESOURCE TECHNOLOGY, v.238, pp.313 - 324
Abstract
The bioanode is important for a microbial electrolysis cell (MEC) and its robustness to maintain its catalytic activity affects the performance of the whole system. Bioanodes enriched at a potential of +0.2 V (vs. standard hydrogen electrode) were able to sustain their oxidation activity when the anode potential was varied from -0.3 up to +1.0 V. Chronoamperometric test revealed that the bioanode produced peak current density of 0.36 A/m(2) and 0.37 A/m(2) at applied potential 0 and +0.6 V, respectively. Meanwhile hydrogen production at the biocathode was proportional to the applied potential, in the range from -0.5 to -1.0 V. The highest production rate was 7.4 L H-2/(m(2) cathode area)/day at -1.0 V cathode potential. A limited current output at the bioanode could halt the biocathode capability to generate hydrogen. Therefore maximum applied potential that can be applied to the biocathode was calculated as -0.84 V without overloading the bioanode. (C) 2017 The Authors. Published by Elsevier Ltd.
Keywords
HYDROGEN GAS-PRODUCTION; FUEL-CELLS; GEOBACTER-SULFURREDUCENS; ELECTROCHEMICAL SYSTEMS; GRAPHITE CATHODES; ANODE POTENTIALS; H-2 PRODUCTION; WASTE-WATER; START-UP; BIOFILMS; Biological microbial electrolysis cell; Limiting factor; Applied potential; Bioanode; Biocathode
ISSN
0960-8524
URI
https://pubs.kist.re.kr/handle/201004/122444
DOI
10.1016/j.biortech.2017.03.127
Appears in Collections:
KIST Article > 2017
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