Progress in non-precious metal oxide-based cathode for polymer electrolyte fuel cells
Progress in non-precious metal oxide-based cathode for polymer electrolyte fuel cells
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DOI：
10.1016/j.electacta.2010.03.002
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发表时间：
2010-11-30
影响因子：
6.6
通讯作者：
Ota, Ken-ichiro
中科院分区：
文献类型：
--
作者：
Ishihara, Akimitsu;Ohgi, Yoshiro;Ota, Ken-ichiro
用于聚合物电解质燃料电池的阴极催化剂应该具有高稳定性以及优异的氧还原反应（ORR）催化活性，第4族和第5族金属氧化物。虽然第4和5族金属氧化物即使在酸性和氧化性气氛中也具有高稳定性，但它们几乎是绝缘体，并且具有差的氧化物的表面改性方法有四种：（1）形成含活性位的复合氧化物层（2）氮的替代掺杂（3）引入表面氧缺陷（4）碳氮化物的部分氧化这些改性有效地提高了氧化物的ORR活性。在30 ℃下在大气条件下的ORR的起始电位大多小于铂黑的，表明氧化物基催化剂与铂相比具有足够的稳定性。3）在30 C下实现超过0 9 V的可逆氢电极（C）2010 Elsevier Ltd版权所有
The cathode catalysts for polymer electrolyte fuel cells should have high stability as well as excellent catalytic activity for oxygen reduction reaction (ORR) Group 4 and 5 metal oxide-based compounds have been evaluated as a cathode from the viewpoint of their high catalytic activity and high stability Although group 4 and 5 metal oxides have high stability even in acidic and oxidative atmosphere they at e almost insulator and have poor ORR activity because they have a large band-gap It is necessary to modify the surface of the oxides to improve the ORR activity We have tried the surface modification methods of oxides Into four methods (1) formation of complex oxide layer containing active sites (2) substitutional doping of nitrogen (3) Introduction of surface oxygen defect and (4) partial oxidation of carbonitrides These modifications were effective to improve the ORR activity of the oxides The solubility of the oxide-based catalysts in 0 1 mol dm(-3) at 30 C under atmospheric condition was mostly smaller than that of platinum black indicating that the oxide-based catalysts had sufficient stability compare to the platinum The onset potential of various oxide-based cathodes for the ORR in 0 1 mol dm(-3) at 30 C achieved over 0 9 V vs a reversible hydrogen electrode (C) 2010 Elsevier Ltd All rights reserved