eprintid: 11094 rev_number: 2 eprint_status: archive userid: 1 dir: disk0/00/01/10/94 datestamp: 2023-11-10 03:25:38 lastmod: 2023-11-10 03:25:38 status_changed: 2023-11-10 01:14:29 type: article metadata_visibility: show creators_name: Jafary, T. creators_name: Wan Daud, W.R. creators_name: Ghasemi, M. creators_name: Abu Bakar, M.H. creators_name: Sedighi, M. creators_name: Kim, B.H. creators_name: Carmona-Martínez, A.A. creators_name: Jahim, J.M. creators_name: Ismail, M. title: Clean hydrogen production in a full biological microbial electrolysis cell ispublished: pub keywords: Biological systems; Electrolysis; Electrolytic cells; Hydrogen production; Photobiological hydrogen production; Regenerative fuel cells, Bio-hydrogen production; Efficient oxidations; Hydrogen evolution reactions; Hydrogen production rate; Linear sweep voltammetry; Maximum current density; Mode of operations; Onset potential, Microbial fuel cells note: cited By 61 abstract: 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, HB-MFC) and a half biological MEC (abioanode-biocathode, HB-MEC), respectively. The FB-MEC 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/m2 and the FB-MEC-RB reached a maximum current density of 2.5 A/m2 at a similar applied voltage while the abiotic control system showed the maximum of 0.2 A/m2. 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 FB-MEC-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. © 2018 Hydrogen Energy Publications LLC date: 2019 publisher: Elsevier Ltd official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85040700738&doi=10.1016%2fj.ijhydene.2018.01.010&partnerID=40&md5=26bb98376ef9d88c83521024238f0072 id_number: 10.1016/j.ijhydene.2018.01.010 full_text_status: none publication: International Journal of Hydrogen Energy volume: 44 number: 58 pagerange: 30524-30531 refereed: TRUE issn: 03603199 citation: Jafary, T. and Wan Daud, W.R. and Ghasemi, M. and Abu Bakar, M.H. and Sedighi, M. and Kim, B.H. and Carmona-Martínez, A.A. and Jahim, J.M. and Ismail, M. (2019) Clean hydrogen production in a full biological microbial electrolysis cell. International Journal of Hydrogen Energy, 44 (58). pp. 30524-30531. ISSN 03603199