Related Experiment Videos
Hydrogen adsorption in nanoporous nickel(II) phosphates
Paul M Forster1, Juergen Eckert, Jong-San Chang
1Materials Research Laboratory, University of California, Santa Barbara, California 93106, USA.
Journal of the American Chemical Society
|January 30, 2003
Summary
Nanoporous nickel phosphates VSB-1 and VSB-5 exhibit distinct hydrogen sorption behaviors. VSB-5 shows stronger hydrogen interaction and higher uptake due to accessible Ni(2+) sites, unlike VSB-1.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Physical Chemistry
Background:
- Nanoporous materials are crucial for gas storage applications.
- Nickel phosphates, such as VSB-1 and VSB-5, are investigated for their potential in hydrogen sorption.
Purpose of the Study:
- To investigate and compare the hydrogen sorption properties of VSB-1 and VSB-5.
- To elucidate the nature of hydrogen interaction with the VSB-5 host material.
Main Methods:
- Gas adsorption measurements using Brunauer-Emmett-Teller (BET) analysis.
- Temperature-programmed desorption (TPD) to study hydrogen desorption kinetics.
- Inelastic neutron scattering (INS) to probe the interaction of adsorbed hydrogen molecules.
Main Results:
- VSB-5 demonstrated significantly higher hydrogen adsorption capacity compared to VSB-1, particularly at low partial pressures.
- TPD and INS data indicated a strong interaction between hydrogen and VSB-5, with specific desorption peaks observed.
- VSB-1 exhibited weaker hydrogen interaction, as evidenced by the absence of comparable desorption features.
Conclusions:
- The enhanced hydrogen sorption in VSB-5 is attributed to the presence of coordinatively unsaturated Ni(2+) sites within its pores.
- These accessible Ni(2+) sites facilitate strong interactions with H(2) molecules, leading to superior adsorption performance.
- The findings highlight VSB-5 as a promising material for hydrogen storage applications.