Studies on Co-based catalysts supported on modified carbon substrates for PEMFC cathodes
Studies on Co-based catalysts supported on modified carbon substrates for PEMFC cathodes
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DOI：
10.1016/j.jpowsour.2005.07.031
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发表时间：
2006-06
影响因子：
9.2
通讯作者：
N. Subramanian;S. Kumaraguru;H. Colón-Mercado;Hansung Kim;B. Popov;Timothy Black;Donna A. Chen
中科院分区：
文献类型：
--
作者：
N. Subramanian;S. Kumaraguru;H. Colón-Mercado;Hansung Kim;B. Popov;Timothy Black;Donna A. Chen
钴基非贵金属催化剂通过将钴-乙二胺络合物负载在碳上，然后在升高的温度（800°C）下热处理来制备。用硝酸氧化法在炭表面引入氧基团。以氧化碳为载体的钴催化剂对氧分子的四电子还原具有更高的活性和选择性。通过硝酸处理引入的醌基团，除了增加螯合物的分散性之外，还在形成氧还原的活性位点中发挥作用。
Cobalt based non-precious metal catalysts were prepared by supporting cobalt-ethylene diamine complex on carbon followed by a heat treatment at elevated temperatures (800°C). Surface oxygen groups on carbon were introduced with HNO3oxidation. Co catalysts supported on oxidized carbon showed improved activity and selectivity towards four-electron reduction of molecular oxygen. Quinone groups introduced by nitric acid treatment, in addition to increasing the dispersion of the chelate complexes, play a role in forming the active site for oxygen reduction.