Catalytic activities of non-noble metals for hydrogen generation from aqueous ammonia-borane at room temperature
Catalytic activities of non-noble metals for hydrogen generation from aqueous ammonia-borane at room temperature
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DOI：
10.1016/j.jpowsour.2006.09.043
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发表时间：
2006-12
影响因子：
9.2
通讯作者：
Qiang Xu;M. Chandra
中科院分区：
文献类型：
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作者：
Qiang Xu;M. Chandra
本文研究了负载型非贵金属催化剂在室温下NH_3BH_3水溶液制氢反应中的催化性能。在所测试的非贵金属中，负载的Co、Ni和Cu是最具催化活性的，用其从NH3 BH 3水溶液中以几乎化学计量的量释放氢，而负载的Fe对于该反应是无催化活性的。以γ-Al_2O_3、SiO_2和C为载体，考察了载体对催化剂活性的影响，发现Co/C催化剂具有较高的活性。在Co/γ-Al_2 O_3存在下，NH_3BH_3水溶液制氢的活化能为62 kJmol-1，这可能对应于BN键断裂的步骤。通过X射线衍射（XRD）、透射电镜（TEM）、能谱仪（EDX）和比表面积（BET）等测试手段对催化剂的粒径、表面形貌和比表面积进行了表征。结果表明，随着粒径的减小，负载型催化剂的活性提高。低成本、高性能的负载型非贵金属催化剂在便携式燃料电池制氢中具有很大的应用潜力。
We have studied catalytic performance of supported non-noble metals for hydrogen generation from aqueous NH3BH3at room temperature. Among the tested non-noble metals, supported Co, Ni and Cu are the most catalytically active, with which hydrogen is released with an almost stoichiometric amount from aqueous NH3BH3, whereas supported Fe is catalytically inactive for this reaction. Support effects on the catalytic activity have been investigated by testing the hydrogen generation reaction in the presence of Co supported on γ-Al2O3, SiO2and C and it is found that the Co/C catalyst has higher activity. Activation energy for hydrogen generation from aqueous NH3BH3in the presence of Co/γ-Al2O3was measured to be 62kJmol−1; this may correspond to the step of BN bond breaking. Particle size, surface morphology and surface area of the supported metal catalysts were examined by X-ray diffraction (XRD), transmission electron microscope (TEM), energy dispersive X-ray (EDX) and BET experiments. It is found that with decreasing the particle size the activity of the supported catalyst is increased. The low-cost and high-performance supported non-noble metal catalysts may have high potential to find its application to the hydrogen generation for portable fuel cells.