Electrochemical Oxidation of Activated Carbon and Coal Chars in a Direct Carbon Fuel Cell Using Carbon/Carbonate Slurry Stirred by Ar Bubbling

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Tomoaki Furuyama¹  Ken Okazaki¹  Hirotatsu Watanabe¹ 

[1] Graduate School of Science and Engineering, Tokyo Institute of Technology

关键词: Direct Carbon Fuel Cell;    Electrochemical Oxidation of Carbon;    Bubbling;    Coal Char;   

DOI  :  10.1252/jcej.14we288

来源: Maruzen Company Ltd

【 摘 要 】

References(12)Cited-By(1)The electrochemical oxidation of carbon was studied in a direct carbon fuel cell (DCFC) using a carbon/carbonate slurry stirred by Ar bubbling. First, a single carbon pellet in contact with an anode in molten carbonate was observed during discharge. Bubbles were produced from the carbon during the discharge, indicating that the electrochemical oxidation of the carbon was advanced. The performance of the DCFC using activated carbon was then studied. By increasing the Ar bubbling flow rate (Qbub) from 25 to 50 mL/min, the overpotential increased at high current density where the concentration polarization appeared; whereas, the overpotential at Qbub=25 mL/min was almost the same as that at Qbub=50 mL/min at lower current density than 20 mA/cm2 and coulombic efficiency increased from 78 to 93% at 20 mA/cm2. The bubbling optimization is expected to improve DCFC performance. Coulombic and voltage efficiencies decreased with increasing the current density, while the power density remained the same. The performance of the DCFC using coal chars was also studied. Ar bubbling was effective in the DCFC using coal chars.

【 授权许可】

Unknown