Development of nanophase CeO2-Pt/C cathode catalyst for direct methanol fuel cell
Development of nanophase CeO2-Pt/C cathode catalyst for direct methanol fuel cell
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DOI：
10.1016/j.jpowsour.2004.08.015
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发表时间：
2005-01
影响因子：
9.2
通讯作者：
Hwanhee Yu;Joon-Hee Kim;Ho-In Lee;M. Scibioh;Jaeyoung Lee;Jonghee Han;S. Yoon;H. Ha
中科院分区：
文献类型：
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作者：
Hwanhee Yu;Joon-Hee Kim;Ho-In Lee;M. Scibioh;Jaeyoung Lee;Jonghee Han;S. Yoon;H. Ha
将纳米相铈（CeO2）掺入阴极催化剂Pt/C中，提高了空气中局部氧浓度，从而提高了直接甲醇燃料电池（DMFC）的单电池性能。掺铈催化剂在低氧分压（≤0.6atm）和1wt条件下有效。% ceo2掺杂Pt/C表现出最高的性能。以空气为正极反应物时，二氧化铈的影响更为明显，在纯氧气氛中，二氧化铈仅作为杂质存在，降低了DMFC的性能。阻抗谱显示，在阴极催化剂的低电位区，氧化铈的加入降低了极化电阻，证实了反应物氧分子向催化位点的快速传质。透射电镜（TEM）图像显示，在铂点周围ceo_2分布均匀。
Incorporation of nanophase ceria (CeO2) into the cathode catalyst Pt/C increased the local oxygen concentration in an air atmosphere, leading to enhanced single-cell performance of direct methanol fuel cell (DMFC). Ceria doped catalysts were effective at low oxygen partial pressure (≤0.6atm) conditions and 1wt.% CeO2doped Pt/C exhibited the highest performance. The effect of ceria was more prominent with air as the cathode reactant and the ceria acted as a mere impurity in a pure oxygen atmosphere, decreasing the DMFC performance. Impedance spectra showed a decrease in polarization resistance with the ceria addition to the cathode catalyst in low-potential regions confirming the facile mass transfer of the reactant oxygen molecules to catalytic sites. Transmission electron microscopy (TEM) pictures showed a uniform distribution of CeO2around platinum sites.