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2002f110236金虫 (小有名气)
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[交流]
求教关于氢气催化问题
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| 就像在燃料电池中，把氢气催化成氢离子或者是氢原子，在不是太高的温度下，除了贵金属，还有别的催化剂吗？请高手不吝指教，谢谢了。 |
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★ ★
aijunhao2002230(金币+2,VIP+0):多谢热心应助！：）
aijunhao2002230(金币+2,VIP+0):多谢热心应助！：）
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这篇文章提供了一个新型的电极材料(cobalt-polypyrrolecarbon composite)，可以取代贵金属用在燃料电池。 NATURE 443(2006)63 Fuel cells, as devices for direct conversion of the chemical energy of a fuel into electricity by electrochemical reactions, are among the key enabling technologies for the transition to a hydrogenbased economy1–3. Of several different types of fuel cells under development today, polymer electrolyte fuel cells (PEFCs) have been recognized as a potential future power source for zeroemission vehicles4,5. However, to become commercially viable, PEFCs have to overcome the barrier of high catalyst cost caused by the exclusive use of platinum and platinum-based catalysts6–8 in the fuel-cell electrodes. Here we demonstrate a new class of lowcost (non-precious metal)/(heteroatomic polymer) nanocomposite catalysts for the PEFC cathode, capable of combining high oxygen-reduction activity with good performance durability. Without any optimization, the cobalt-polypyrrole composite catalyst enables power densities of about 0.15Wcm22 in H2-O2 fuel cells and displays no signs of performance degradation for more than 100 hours. The results of this study show that heteroatomic polymers can be used not only to stabilize the nonprecious metal in the acidic environment of the PEFC cathode but also to generate active sites for oxygen reduction reaction. |
2楼2007-11-06 15:20:02
3楼2007-11-06 15:30:13
2002f110236
金虫 (小有名气)
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4楼2007-11-09 08:56:47