Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5147973 | International Journal of Hydrogen Energy | 2017 | 9 Pages |
Abstract
In order to enhance hydrogen storage capacity of carbonaceous materials through metal modification, FeNiCr-carbon composites were prepared by calcination of Fe, Ni and Cr-containing polyacrylonitrile (PAN) fibers fabricated by electrospinning method. Fe (III), Ni (II) and Cr (III) acetylacetonates (M (acac)n) were selected as metal sources. Increase of specific surface area and formation of micropores were observed on heat decomposition of M (acac)n particularly through introduction of steam. Maximal hydrogen content, 1.62 mass%, was obtained at 77Â K under 0.8Â MPa of hydrogen for a FeNiCr-carbon composite, which contained about 15.5 mass% of metals and had specific surface area of 501Â m2Â gâ1. The hydrogen content exceeded the hydrogen physisorption limit, 2.34 mass% per 1000Â m2Â gâ1, which was calculated on the basis of the commensurate-incommensurate transition with an enhancing factor Ï of 1.126. After hydrogenation at 653Â K, no hydrogen desorption peaks were observed for FeNiCr powders derived from M (acac)n, and one peak at 828Â K for a carbonaceous sample prepared from unmodified PAN fibers. From the most promising FeNiCr-carbon composite, another peak was recorded at 752Â K in addition to the peak at 828Â K. The former would be originated from hydrogen on novel sorption sites additionally created on the composite formation.
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Authors
Takehiro Kaneko, Yasuhiro Watanuki, Takeshi Toyama, Yoshiyuki Kojima, Nobuyuki Nishimiya,