This study describes the performance of bioelectrochemical systems, based on electrochemically active mixed culture, capable of reducing CO2 to CH4 and CH3COOH via direct and/or indirect extracellular electron transfer. The metabolic pathway and end products of this mixed culture were highly dependent on the set cathode potentials. Only CH4 and H-2 were produced when the cathode potentials were set in the range from -850 to -950 mV (vs. Ag/AgCl). At potentials more negative than -950 mV, CH4, H-2 and CH3COOH were wsimultaneously produced. With a relatively large cathode surface area of 49 cm(-2), CH4 and CH3COOH were produced at high rates of 129.32 mL d(-1) and 94.73 mg d(-1), respectively (at potential of -1150 my). The highest current capture efficiency reached to 97% in batch potentiostatic experiments. These results presented here suggest that mixed culture show the ability to directly accept electrons from the electrode and abiotically produce H-2 to convert CO2 into various organic compounds. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.