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A series of MoS2-Cu-RGO composites were synthesized by hydrothermal method, and loaded on the carbon-based electrode. The best MoS2-Cu-RGO electrode selected through electrochemical tests was applied as the cathode to produce hydrogen in a single-chamber microbial electrolysis cell (MEC). SEM and TEM images showed that most thin MoS2 sheets vertically grew on the surface of RGO; Cu2O acted as the bridged absorbent and efficient charge transfer channels between RGO and MoS2, which exposed more hydrogen evolution active sites and improved the electrical conductivity. Electrochemical tests showed that the optimal mass ratio of (NH4)2MoS4, GO and CuCl2·2H2O was 1:1:1.1, and 3 mg/cm 2 was the optimal load for carbon paper. The average current density, coulombic efficiency, hydrogen recovery efficiency, cathodic hydrogen recovery efficiency, hydrogen production rate, electrical recovery efficiencies and overall energy recovery efficiencies obtained with MoS2-Cu-RGO cathode MEC were 10.28±0.40 A/m, 92.10±3.53%, 74.69±4.45%, 79.22±3.53%, 0.449±0.027 mH2/m d, 237.68±15.66% and 88.20±5.60%, higher than those obtained with the Pt/C cathode MEC. The MoS2-Cu-RGO cathode enjoyed good stability and price advantage, which might promote the practical application of MECs.

Electrochemical Evaluation of MoS2-Cu-RGO as a Catalyst for Hydrogen Evolution in Microbial Electrolysis Cell