Lignocellulosic residues, which accompany the production of bioethanol and biodiesel fuels, can be efficiently and quickly converted into biocarbons (i.e. charcoal). Carbon fuel cells can generate electricity from these biocarbons with a theoretical thermodynamic efficiency of 100%. This presentation will detail the performance of an aqueous-alkaline carbon fuel cell. Thermochemical equilibrium favors the reduction of oxygen on the cathode of this cell at temperatures below 200°C. But the kinetics of carbon oxidation by hydroxyl anions on the anode demand temperatures above 200°C. Nevertheless, operating at 518 K and 35.8 bar with corncob charcoal as its fuel this cell was able to realize an open circuit voltage (OCV) of 0.57 V and a short circuit current density of 43.6 mA/cm2. This OCV is lower than expected; thermodynamics predicts an OCV of about 1 V. This finding motivates the emphasis of higher anode temperatures in our future work.