In the paper the behavior of various carbon-rich materials used as fuels for the direct carbon fuel cell (DCFC) with molten hydroxide electrolyte is presented. For the current research various carbonaceous fuels (e.g., different biochars, hard coal, graphite, carbon black) were tested. The electrolyte was the binary eutectic mixture of sodium and lithium hydroxides (90 mol.% NaOH - 10 mol.% LiOH). The fuel cell was operated at 723 K and cathode air flow rate of 0.5 dm(3) min(-1). The maximum power densities were achieved for raw coal and commercial biochar and made up 38.6 mW cm(-2) and 32.8 mW cm(-2), respectively. (C) 2014 Elsevier B.V. All rights reserved.