磷钼酸对直接甲醇燃料电池阴极氧还原的促进作用

以磷钼酸(H₄PMo₁₂O₄0·xH₂O,PMo₁₂)为直接甲醇燃料电池(DMFC)阴极添加剂,制备了Pt-PMo₁₂/C复合催化剂.电化学测试表明,该添加剂对于DMFC阴极氧还原具有明显的促进作用,与常规的Pt/C催化剂相比,相同载量下极限扩散电流提高了56.3%.在单电池性能测试中,这种促进作用使电池的最大输出功率提高了28%.

Promotion Effect of Molybdophorsphoric Acid on Oxygen Reduction for Cathode of DMFC

One kind of heteropolyacids(H₄PMo₁₂O₄₀·xH₂O)is introduced into the cathodic electro-catalyst of direct methanol fuel cell(DMFC) as an additive. The electrochemical result shows that these modified electrodes display an excellent eletrocatalytic activity for oxygen reduction reaction. Using the catalyst modified by PMo₁₂ the catalysis activity for the oxygen reduction reaction can be improved by a factor of 56.3% compared with Pt/C catalyst with the same platinum loading. This effect is also elucidated in the performance of single cell for DMFC. The peak value of power density is 28% higher than DMFC with a conventional electrode. These are may be due to the specific Keggin structure of the PMo₁₂. A better stability is obtained when the PMo₁₂ is introduced into the electrode.