Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 44, Issue 58, Pages 30524-30531Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2018.01.010
Keywords
Microbial electrolysis cell; Full biological system; Mode of operation; Hydrogen production; Onset potential
Categories
Funding
- Universiti Kebangsaan Malaysia [FRGS/1/2014/TK06/UKW03/1, GUP-2015-036, LRGS/2013/UKM/TK/01]
- Petroleum Engineering Department at Universiti Teknologi PETRONAS [STIRF0153AA-F81, 1-2015 KACST-ITM-CNR]
- European Union's Horizon 2020 research and innovation programme through the iMETI project [642190]
- Green Technology Center at Universiti Teknologi PETRONAS [STIRF0153AA-F81, 1-2015 KACST-ITM-CNR]
- H2020 Societal Challenges Programme [642190] Funding Source: H2020 Societal Challenges Programme
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The recent interest in microbial electrolysis cell (MEC) technology has led the research platform to develop full biological MECs (bioanode-biocathode, FB-MEC). This study focused on biohydrogen production from a biologically catalyzed MEC. A bioanode and a biocathode were initially enriched in a half biological MFC (bioanode-abiocathode, HBMFC) and a half biological MEC (abioanode-biocathode, HB-MEC), respectively. The FBMEC was established by transferring the biocathode of the HB-MEC and the bioanode of the HB-MFC to a two-chamber MEC. The FB-MEC was operated under batch (FB-MEC-B) and recirculation batch (FB-MEC-RB) modes of operation in the anodic chamber. The FB-MEC-B reached a maximum current density of 1.5 A/m(2) and the FB-MEC-RB reached a maximum current density of 2.5 A/m(2) at a similar applied voltage while the abiotic control system showed the maximum of 0.2 A/m(2). Hydrogen production rate decreased in the FB-MEC compared to that of the HB-MEC. However, the cathodic hydrogen recovery increased from 42% obtained in the HB-MEC to 56% in the FB-MEC-B and 65% in the FB-MEC-RB, suggesting the efficient oxidation and reduction rates in the FB-MEC compared to the HB-MEC. The onset potential for hydrogen evolution reaction detected by linear sweep voltammetry analysis were -0.780 and -0.860 V vs Ag/AgCl for the FB-MEC-RB and the FBMEC-B (-1.26 for the abiotic control MEC), respectively. Moreover, the results suggested that the FB-MEC worked more efficiently when the biocathode and the bioanode were enriched initially in half biological systems before transferring to the FB-MEC compared to that of the simultaneously enriched in one system. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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