Liquid antimony anode direct carbon fuel cell fueled with mass-produced de-ash coal

摘要

A liquid antimony (Sb) anode DCFC (direct carbon fuel cell) is fabricated on a smooth single crystal YSZ (Yttria Stabilized Zirconia) electrolyte substrate with porous Pt cathode to reveal the intrinsic reaction kinetics of electrochemical oxidation of liquid Sb and the reduction reaction characteristics of Sb_2O_3 with the reaction mass-produced Taixi de-ash coal fuel. The reduction kinetics of Sb_2O_3 with the de-ash coal is obtained using a temperature programmed reaction testing system. The reaction kinetics of the Sb_2O_3 with the de-ash coal can be enhanced by decreasing the coal particle size, and by adding de-ash coal into the anode chamber. The Sb_2O_3 accumulation at the interface between anode and electrolyte lead to the increase of ohmic resistance. While effective reaction active sites increase when the mole content of oxygen ion conductor Sb_2O_3 increase at the earlier stage of the cell discharging processes which further decrease the electrode polarization. The Si and Fe in the ash possibly accumulate at the interface between anode and electrolyte.