Ni nanoparticles supported on CNTs with excellent activity produced by atomic layer deposition for hydrogen generation from the hydrolysis of ammonia borane
Ni nanoparticles supported on CNTs with excellent activity produced by atomic layer deposition for hydrogen generation from the hydrolysis of ammonia borane
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DOI：
10.1039/c5cy01497b
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发表时间：
2016-04
影响因子：
5
通讯作者：
Jiankang Zhang;Chaoqiu Chen;Wenjun Yan;F. Duan;Bin Zhang;Zhe Gao;Yong Qin
中科院分区：
文献类型：
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作者：
Jiankang Zhang;Chaoqiu Chen;Wenjun Yan;F. Duan;Bin Zhang;Zhe Gao;Yong Qin
以多壁碳纳米管（CNTs）为载体，采用原子层沉积法制备了负载量可控的高分散、均匀的Ni纳米粒子，并用于氨硼烷（AB）水解制氢。研究了不同ALD循环次数制备的Ni/CNT纳米催化剂对AB水解反应的催化性能。结果表明，所有Ni/CNT纳米催化剂对AB的水解都表现出优异的催化活性，其中200次ALD循环制备的Ni/CNT具有最高的产氢速率，总转换频率值高达26.2 molH 2 molNi−1 min−1，高于文献中报道的大多数镍基催化剂。AB水解的水解完成时间和活化能分别为4.5 min和32.3 kJ mol−1。此外，2个ALD循环的Pt掺杂（仅0.68wt%）可以显着提高Ni/CNT纳米催化剂的催化活性和可重复使用性，由于其促进作用。我们的研究结果表明，ALD是一种很有前途的技术，用于设计和制造高效，经济，非贵金属纳米催化剂的水解AB。
Highly dispersed, uniform Ni nanoparticles with controlled loadings supported on multi-walled carbon nanotubes (CNTs) were synthesized by atomic layer deposition for hydrogen generation from the hydrolysis of ammonia borane (AB). The catalytic performance of Ni/CNT nanocatalysts prepared with varying ALD cycle numbers was investigated for the hydrolysis of AB in water. The results show that all the Ni/CNT nanocatalysts exhibit excellent catalytic activities towards the hydrolysis of AB, and the Ni/CNTs produced with 200 ALD cycles have the highest hydrogen generation rate, with a total turnover frequency value as high as 26.2 molH2 molNi−1 min−1, which is higher than that of most nickel-based catalysts previously reported in the literature. The hydrolysis completion time and activation energy of AB hydrolysis are 4.5 min and 32.3 kJ mol−1, respectively. Furthermore, 2 ALD cycles of Pt doping (only 0.68 wt%) can significantly improve the catalytic activity and reusability of Ni/CNT nanocatalysts due to its promotion effect. Our results suggest that ALD is a promising technique for designing and fabricating efficient, economical, and non-noble metal nanocatalysts for the hydrolysis of AB.