Abstract
In this study, the effective Cu doping Co(OH)F catalyst with three-dimensional network nanowires is successfully prepared by the one-step in situ hydrothermal route for Microbial Electrolytic Cell (MEC) cathode to improve the overall hydrogen production rate. The results demonstrate that the optimized doping ratio Cu-Co(OH)F exhibits a high open three-dimensional network structure and a good electrochemical hydrogen evolution activity (Tafel slope is 52.0 mV dec−1). In addition, the MEC with Cu-Co(OH)F cathode exhibits an extremely high current density of 69.2 A m−2, hydrogen production rate of 214.5 ml H2 L−1 cycle−1, and coulombic efficiency of 80.75%, which significantly improved the activity compared with undoped one. The results of density functional theory (DFT) calculations confirm that the doping of copper could regulate the electron transport rate and the Gibbs free energy to accelerate the process of hydrogen evolution, thus resulting in excellent hydrogen production in MEC.
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