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Title: Efficient hydrogen production using Ni-graphene oxide-dispersed laser-engraved 3D carbon micropillars as electrodes for microbial electrolytic cell
Authors: Yadav, Ashish
Verma N.
Published in: Renewable Energy
Abstract: A nickel (Ni)-graphene oxide (GO) dispersed carbon film was prepared by the carbonization of the phenolic precursor-based polymer. Three dimensional (3D) micropillars were fabricated on the carbon film using laser ablation technique. The micropillars-engraved film was used as electrodes in a single chamber microbial electrolytic cell (MEC) for hydrogen (H2) production. Besides promoting biofilm formation at anode, the 3D micropillars provided relatively more exposure to the in situ dispersed electrocatalytic Ni nanoparticles (NPs) and electroconductive GO in the carbon film. The Tafel slope of ∼49 mV dec−1 indicated that Heyrovsky reaction or electrochemical desorption was the rate determining step for H2 evolution. A H2 production rate of 4.22 ± 0.21 m3m−3d−1 was measured at 0.8 V in the prepared electrode-based MEC. Whereas the overall H2 and cathodic recoveries were measured to be 92.3 ± 2.77% and 98.7 ± 0.99%, respectively, the Coulombic and overall energy efficiencies were determined to be 93.5 ± 2.81% and 72.2 ± 3.61%, respectively. The relatively higher efficiency of the MEC was ascribed to the synergistic contributions of the 3D micropillars, Ni NPs and GO, indicating the prepared electrode to be a viable alternative to the expensive noble metal-based electrodes used in MECs for H2 production. © 2019 Elsevier Ltd
Citation: Renewable Energy, 138: 628-638
Issue Date: 2019
Publisher: Elsevier Ltd
Keywords: 3D micropillars
Graphene oxide
H2 production
Laser ablation
Microbial electrolytic cell
Ni nanoparticles
ISSN: 9601481
Author Scopus IDs: 57640655800
Author Affiliations: Yadav, A., Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
Verma, N., Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India, Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
Funding Details: The authors acknowledge the Center for Environmental Science and Engineering, IIT Kanpur for performing the research. Illinois Institute of Technology, IIT
Corresponding Author: Verma, N.; Department of Chemical Engineering, India; email:
Appears in Collections:Journal Publications [CH]

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