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Nature Chemistry 关于纳米催化氢能源最新文献
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燃料电池领域大牛Nenad M. Markovic 课题组报道了PtIr和PtRu材料碱性条件下对氢气氧化活性比最好的Pt催化剂至少提高5倍。并且对机理进行了解释。 Title: Improving the hydrogen oxidation reaction rate by promotion of hydroxyl adsorption Abstract: The development of hydrogen-based energy sources as viable alternatives to fossil-fuel technologies has revolutionized clean energy production using fuel cells. However, to date, the slow rate of the hydrogen oxidation reaction (HOR) in alkaline environments has hindered advances in alkaline fuel cell systems. Here, we address this by studying the trends in the activity of the HOR in alkaline environments. We demonstrate that it can be enhanced more than five fold compared to state-of-the-art platinum catalysts. The maximum activity is found for materials (Ir and Pt0.1Ru0.9) with an optimal balance between the active sites that are required for the adsorption/dissociation of H2 and for the adsorption of hydroxyl species (OHad). We propose that the more oxophilic sites on Ir (defects) and PtRu material (Ru atoms) electrodes facilitate the adsorption of OHad species. Those then react with the hydrogen intermediates (Had) that are adsorbed on more noble surface sites.  1.gif |
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2013-03-06 08:10:59, 891.72 K
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