Cobalt nanoparticles embedded in porous N-doped carbon as long-life catalysts for hydrolysis of ammonia borane
Cobalt nanoparticles embedded in porous N-doped carbon as long-life catalysts for hydrolysis of ammonia borane
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嵌入多孔氮掺杂碳中的钴纳米粒子作为氨硼烷水解的长寿命催化剂
DOI：
10.1039/c5cy01756d
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发表时间：
2016-05
期刊：
影响因子：
--
通讯作者：
chen jun
中科院分区：
文献类型：
--
作者：
wang haixia;zhao yaran;cheng fangyi;tao zhanliang;chen jun
钴基材料是一种很有前途的氨硼烷水解催化剂。然而，此类催化剂的稳定性仍然是其应用的挑战。本文报道了一步合成嵌在多孔N掺杂碳中的Co纳米颗粒（表示为Co@N-C）及其对氨硼烷水解的增强催化稳定性。Co@N-C催化剂通过在Ar气氛下在选定温度（600-800 °C）下Co（salen）的一步热处理来制造。结果表明，在本研究的催化剂中，在700 °C下制备的Co@N-C-700纳米复合材料（Co@N-C-700）具有上级催化活性和高的可持续性。Co@N-C-700水解氨硼烷的转换频率（TOF）和活化能分别为5.6 molH 2 molCo−1 min−1和31.0 kJ mol−1。特别地，该催化剂在10次循环后保持其初始催化活性的97.2%。Co@N-C-700的优异催化活性和耐久性归因于Co纳米颗粒在多孔N掺杂碳中的高度分散。这将为提高Co@N-C-700纳米复合材料用于氨硼烷催化水解的循环利用提供见解。
Cobalt-based materials are promising catalysts for hydrolysis of ammonia borane. However, the stability of such catalysts is still a challenge for their application. We here report the one-step synthesis of Co nanoparticles embedded in porous N-doped carbon (denoted as Co@N-C) and their enhanced catalytic stability for hydrolysis of ammonia borane. The Co@N-C catalysts are fabricated through one-step thermolysis of Co(salen) at selected temperatures (600–800 °C) under an Ar atmosphere. It is found that among the catalysts in this study, the Co@N-C nanocomposite obtained at 700 °C (Co@N-C-700) shows superior catalytic activity and high sustainability. The turnover frequency (TOF) and activation energy of Co@N-C-700 for the hydrolysis of ammonia borane are 5.6 molH2 molCo−1 min−1 and 31.0 kJ mol−1, respectively. In particular, this catalyst retains 97.2% of its initial catalytic activity after 10 cycles. The remakable catalytic activity and durability of Co@N-C-700 are attributed to the high dispersion of the Co nanoparticles in the porous N-doped carbon. This would provide insights into the enhancement of the cycling utilization of the Co@N-C-700 nanocomposite for catalytic hydrolysis of ammonia borane.
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影响因子：
4.6
作者：
Cheng, Fangyi;Ma, Hua;Chen, Jun
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DOI：
10.1039/b809243p
发表时间：
2008-09
期刊：
Energy Environ. Sci.
影响因子：
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作者：
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通讯作者：
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影响因子：
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