relation: https://khub.utp.edu.my/scholars/11094/ title: Clean hydrogen production in a full biological microbial electrolysis cell creator: Jafary, T. creator: Wan Daud, W.R. creator: Ghasemi, M. creator: Abu Bakar, M.H. creator: Sedighi, M. creator: Kim, B.H. creator: Carmona-Martínez, A.A. creator: Jahim, J.M. creator: Ismail, M. description: 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 publisher: Elsevier Ltd date: 2019 type: Article type: PeerReviewed identifier: 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 relation: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85040700738&doi=10.1016%2fj.ijhydene.2018.01.010&partnerID=40&md5=26bb98376ef9d88c83521024238f0072 relation: 10.1016/j.ijhydene.2018.01.010 identifier: 10.1016/j.ijhydene.2018.01.010