阳极催化层孔结构对DMFC性能的影响

Effect of pore structure in the anode catalyst layer on the performance of DMFC

采用碳酸铵作为造孔剂,研究了阳极催化层孔结构对直接甲醇燃料电池(DMFC)性能的影响。热重、扫描电镜和压汞法分析的结果表明:碳酸铵的热分解使阳极催化层一次孔的孔容增大,而二次孔的孔容基本不变。电化学测试结果表明:与未加造孔剂的阳极催化层相比,加入碳酸铵使阳极催化层电化学活性表面积增加了26.6%;阳极电位为400 mV时的电流密度提高了53%;开路电位下的甲醇渗透率降低了12.5%;在80℃、0.2 MPa氧气条件下,DMFC的最高功率密度由186 mW/cm2提高到235 mW/cm2。

The effect of pore structure in the anode catalyst layer on the performance of direct methanol fuel cell （DMFC） was investigated using ammonium carbonate as a pore former. The results of thermogravimetry, scanning electron microscopy and mercury intrusion porosimetry analyses showed that the pore volume of primary pore in the anode catalyst layer increased by thermal decomposition of ammonium carbonate, while the pore volume of the secondary pore remained nearly unchanged. The electrochemical test results showed that compared with the anode catalyst layer without adding pore former, the electrochemical active surface of anode catalyst layer adding pore former increased 26.6%, the current density increased 53 % at anode potential of 400 m V, the methanol crossover rate decreased 12.5 % at open circuit potential, the peak power density of D M FC increased from 186 mW/cm^2 to 235 mW/cm^2 at 80℃ and 0.2 MPa oxygen condition.