インピーダンス法によるPEFC過電圧解析方法の研究 : 第1報,等価回路各部抵抗値と過電圧の同定方法(熱工学,内燃機関,動力など)

概要

論文の詳細を見る
PEFC was simulated to the equivalent circuit with four resistances and three capacitances, and accuracy of these estimated value were investigated in AC impedance method. Results show that the estimation reliability of these characteristics can be quantitatively evaluated by coherence function value, and improved by nonlinear least squares technique. Integral calculus by current density i of the R_3 and R_4(⎰(R_3+R_4)di) shows very good correlation to cathode overvoltage (OV) at lower current density region where cathode concentration OV is negligible small. The ⎰R_3di suggests cathode activation OV and corresponds with Butler・Volmer's equation. The ⎰R_4di suggests cathode concentration OV and increases with current density increase. Sum of the OVs (⎰ΣR_idi) and output voltage is lower than Nernstian potential, which shows unknown OV is more than 20%. Analysis and improvement of the unknown OV will make big performance increase in PEFC.
社団法人日本機械学会の論文
2006-11-25