Oxygen reduction characteristics of graphite electrodes modified with cobalt di-quinolyldiamine derivatives
Oxygen reduction characteristics of graphite electrodes modified with cobalt di-quinolyldiamine derivatives
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DOI：
10.1016/s0013-4686(00)00499-0
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发表时间：
2000-09
影响因子：
6.6
通讯作者：
T. Okada;Masaya Yoshida;T. Hirose;K. Kasuga;T. Yu;M. Yuasa;I. Sekine
中科院分区：
文献类型：
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作者：
T. Okada;Masaya Yoshida;T. Hirose;K. Kasuga;T. Yu;M. Yuasa;I. Sekine
合成了N，N′-二-8-喹啉基三亚甲基二胺钴[Co（dqpr）]和N，N′-二-8-喹啉基苯二胺钴[Co（dqph）]，并将其固定在石墨电极上，考察了它们对氧电还原的催化性能。为了修饰石墨，将配合物与石墨粉混合，在400-800°C的Ar气氛中热处理，然后用Nafion溶液固定在石墨电极上。通过热处理，性能显着提高，这被认为是由于热解后仍保留在石墨表面形成稳定的CoN 4螯合物结构。极化测试结果表明，该配合物修饰的电极的性能与5%铂分散在碳上的电极的性能相当。在80°C下在酸性水溶液中热处理的络合物的耐久性测试显示出与铂相比作为氧还原催化剂的相对良好的催化性能。配合物的潜在用途被证明作为阴极催化剂的聚合物电解质燃料电池与少量的铂，其中观察到显着的协同效应之间的铂网站和CoN 4中心分散在碳基板。
N,N′-di-8-Quinolyltrimethylenediamine cobalt [Co(dqpr)] and N,N′-di-8-quinolylphenylenediamine cobalt [Co(dqph)] were synthesized and tested as catalysts for electro-reduction of oxygen when immobilized on graphite electrodes. For modification on graphite, the complexes were mixed with graphite powder and heat-treated in Ar atmosphere at 400–800°C, then immobilized on graphite electrode with Nafion solution. The performance was improved significantly by the heat treatment, and it was assumed to be due to the formation of stabilized CoN4chelate structure still remaining on the graphite surface after pyrolysis. The polarization measurements revealed that the performance of the electrodes modified with the complexes was parallel to that of 5% platinum dispersed on carbon. Durability tests of the heat-treated complex at 80°C in acidic aqueous solutions showed relatively good catalytic performances as oxygen reduction catalysts, as compared with platinum. The potential usage of the complexes was demonstrated as the cathode catalysts in polymer electrolyte fuel cells in combination with fewer amounts of platinum, where a remarkable concerted effect is observed between platinum sites and CoN4centers dispersed on carbon substrate.