Enhanced Hydrogen Storage in MWCNTs Decorated by Electroless Nickel Nanoparticles Deposited in Supercritical CO₂ Bath

Abstract:

Nano-sized nickel particles were dispersed on multi-walled carbon nanotubes (MWCNTs) via an improved electroless deposition route using a supercritical CO2 fluid. The microstructure, chemical composition and crystallinity of the Ni-decorated CNTs were examined using a transmission electron microscope (TEM), an X-ray energy dispersive spectrometer (EDS), and an X-ray diffractometer (XRD), respectively. The analytical results indicate that, with assistance of the supercritical fluid, Ni nanoparticles with a diameter of approximately 10 nm can be uniformly dispersed on the surface of CNTs. The hydrogen storage capacity of the Ni-decorated CNTs was evaluated with a high-pressure microbalance at room temperature and under a hydrogen pressure of 6.89 MPa. The measured hydrogen adsorption amount of the Ni/CNTs nanocomposite was 1.06 wt%, which was much higher than 0.33 wt% found for the plain CNTs.

• Periodical: Materials Science Forum (Volumes 638-642)
• Pages: 1148-1151
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.638-642.1148
• Online since: January 2010
• Authors: Chih Yao Chen, Jeng Kuei Chang, Kuan Yu Lin, Sung Ting Chung, Wen Ta Tsai
• Keywords: Carbon Nanotube (CN), Electroless Deposition, Hydrogen Storage, Supercritical Fuid

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