论文期刊

Preparation of porous carbon with high dispersion of Ru nanoparticles by sol–gel method and its application in hydrogen storage.




作者: Chen, Y. Z; Liu, Y.N.
发表/完成日期: 2014-09-02
期刊名称: Journal of Materials Chemistry A
期卷: 2(24)
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论文简介
Nano-Ru/porous carbon composites were prepared by Ru/aerogels which were made through a reaction
of resorcinol, formaldehyde and RuCl3$3H2O. The specific surface area (SSA) measurement showed that
there was an SSA maximum with the increase of Ru loading. The sample RRu ¼ 5 (mol percent) obtained
the largest SSA value of 1970 m2 g1 and the most homogeneous distribution of Ru nanoparticles on the
porous carbon surface. It also obtained the highest hydrogen adsorption value of 0.8 wt% (7.5 MPa) and
4.1 wt% (4 MPa) at 298 and 77 K respectively. Considering the H2 compressed within the pores, the
corresponding total value reached up to 1.4 wt% (P ¼ 7.5 MPa) and 6.3 wt% (P ¼ 6.5 MPa) at 298 and
77 K respectively. Compared with porous carbon, the Ru/porous carbon composites had an obvious
adsorption increase under the same SSA conditions at 298 K, which were contributed by the hydrogen
spillover of Ru. The calculated contribution rate for hydrogen adsorption was 38%. However, the
spillover effect also brought a hysteresis phenomenon during hydrogen desorption since the hydrogen
spilled from the hydride into the carbon matrix needed a lower pressure to move and release
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