Abstract
This study demonstrates that the hydrogen storage rate (HSR) of nanoporous carbon supported platinum nanocatalysts (NC) is determined by their heterojunction and geometric configurations. The present NC is synthesized in an average particle size of ~1.5 nm by incipient wetness impregnation of Pt4+ at carbon support followed by annealing in H2 ambient at 102–105 °C. Among the steps in hydrogen storage, decomposition of H2 molecule into 2 H atoms on Pt NC surface is the deciding factor in HSR that is controlled by the thickness of Pt NC. For the best condition, HSR of Pt NC in 1~2 atomic layers thick (4.7 μg/g min) is 2.6 times faster than that (1.3 μg/g min) of Pt NC with higher than 3 atomic layers thick.
Highlights
That (1.3 μg/g min) of Pt nanocatalyst (Pt NC) with higher than 3 atomic layers thick
Surface-to-bulk ratio of NC with a known size is proportional to the crystal shape
The step-by-step strategy for determining the impacts of crystal shape on HSR of Pt NC is (1) X-ray diffraction (XRD) and small angle X-ray scattering (SAXS) analyses on the coherent length and geometrical asymmetry of NC in carbon support, (2) surface-to-bulk ratio determination by cross-referencing results of X-ray absorption spectroscopy (XAS) and geometrical calculation, and (3) adsorption energy calculation on Pt-H bondings at Pt NC with thickness determined by structure characterizations
Summary
That (1.3 μg/g min) of Pt NC with higher than 3 atomic layers thick. Details of configuration and surface energy determination in relation to the HSR of Pt/AC are given . The step-by-step strategy for determining the impacts of crystal shape on HSR of Pt NC is (1) XRD and SAXS analyses on the coherent length and geometrical asymmetry of NC in carbon support, (2) surface-to-bulk ratio determination by cross-referencing results of XAS and geometrical calculation, and (3) adsorption energy calculation on Pt-H bondings at Pt NC with thickness determined by structure characterizations.
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