Improved hydrogen generation from alkaline NaBH4 solution using carbon-supported Co–B as catalysts
Improved hydrogen generation from alkaline NaBH4 solution using carbon-supported Co–B as catalysts
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DOI：
10.1016/j.ijhydene.2007.07.004
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发表时间：
2007-12
影响因子：
7.2
通讯作者：
Jianzhi Zhao;Hua Ma;Jun Chen
中科院分区：
文献类型：
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作者：
Jianzhi Zhao;Hua Ma;Jun Chen
采用浸渍-化学还原法制备了不同负载量的碳载Co-B催化剂。XRD、ICP、SEM和TEM分析表明，所制备的Co-B催化剂为非晶态，组成为Co2.0-3.3B，碳载Co-B催化剂具有良好的分散性和包覆性。在25 ℃下，非负载型Co-B催化剂的平均产氢速率为1127.2mLmin-1g-1，而负载量为30.0，15.6，7.44wt%的碳载催化剂的平均产氢速率分别为1268.1，1482.1，2073.1mLmin-1g-1。测得30. 0 wt % Co-B负载催化剂的制氢反应活化能为57.8kJmol-1。与未负载的Co-B催化剂相比，所制备的碳负载催化剂对NaBH 4水溶液具有更高的水解活性，表明其在燃料电池移动的制氢中具有潜在的应用前景。
Carbon-supported Co–B catalysts with various loading contents were prepared by impregnation–chemical reduction method. The XRD, ICP, SEM and TEM analyses revealed that the as-prepared Co–B catalysts were in amorphous form with the composition of Co2.0–3.3B and the carbon-supported Co–B catalysts had a good dispersion and coating condition. The hydrogen generation measurement showed that the average hydrogen generation rate at 25∘C was 1127.2mLmin-1g-1for unsupported Co–B catalyst, while it was 1268.1, 1482.1 and 2073.1mLmin-1g-1for the carbon-supported catalysts with the Co–B loading of 30.0, 15.6 and 7.44wt%, respectively. The activation energy of the 30.0wt% Co–B loading catalyst for the hydrogen generation reaction was measured to be 57.8kJmol-1. Compared with the unsupported Co–B catalyst, the as-prepared carbon-supported catalysts presented higher activity for hydrolysis of NaBH4aqueous solution, indicating their potential application in mobile hydrogen production for fuel cells.