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Effects of Ni Particle Size on Hydrogen Storage of Ni-Doped High Surface Area Activated Carbon
Lufeng
Yang A,
Chunlin
Xie A,
Chaofan
Hu A,
Mingtao
Zheng B,
Haibo
Wang A,
Jianghu
Cui A,
Yong
Xiao B,
Bingfu
Lei B,
Yingliang
Liu B D and
Lixian
Sun C D
A
Department of Chemistry and Institute of Nanochemistry, Jinan University, Guangzhou 510632, China.
B
College of Science, South China Agricultural University, Guangzhou 510642, China.
C
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
D
Corresponding authors. Email: tliuyl@163.com; lxsun@dicp.ac.cn
Australian Journal of Chemistry
- http://dx.doi.org/10.1071/CH12460
Submitted: 7 October 2012 Accepted: 20 December 2012 Published online:
16
January
2013
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Abstract
A type of activated carbon that is further chemically activated to obtain a high surface area (~3322 m2 g–1) (hsAC), is loaded with nickel nanoparticles by a direct hydrothermal method, and tested for hydrogen storage. The chemical composition, crystal structure, and microstructure of hsAC with or without Ni loading are characterised in addition to the nitrogen absorbance isotherms. Hydrogen storage studies showed that metal doping has no effect on the cryogenic storage, and the maximum room temperature (RT) storage capacity through spillover on the Ni-doped hsAC materials achieved 0.79 wt-% at 30 Pa with enhancement factors of 2.93. The smaller catalyst size was a critical factor that determined the enhancement of RT storage capacity of the materials. The Ni catalyst size was controlled by the doped Ni content. Tuning the Ni catalyst size together with an optimum carbon spillover receptor should play an effective role in further enhancement by the spillover effect. 
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