Chemisorption solid materials for hydrogen storage near ambient temperature: a review

Zhang, Yiheng; Wu, Shaofei; Wang, Liwei; Zhang, Xuefeng

doi:10.1007/s11708-022-0835-7

Cited by 11 publications

(1 citation statement)

References 139 publications

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“…The materials that are suitable for the accumulation of hydrogen in the solid state, on which international research is focusing, essentially belong to two different classes [13]. These classes can be distinguished by the different types of bonds they form with hydrogen; physisorption [14] occurs through weak Van der Waals surface bonds exploiting the morphological characteristics of the materials, and chemisorption occurs through strong covalent bonds [15]. The first class includes all carbonaceous materials, such as nanotubes [16], activated carbons [17,18], fullerenes [19], graphenes [20], and MOFs [21], whose main characteristics are to possess a high surface area (over 2000 m 2 /g) and to have good adsorption capacity, even above 6 wt%, but only in low T conditions (−196.15 • C).…”

Section: Introductionmentioning

confidence: 99%

Pt Effect on H2 Kinetics Sorption in Mn Oxide-Based Polymeric Material

Pedicini,

Sigalas

2024

Hydrogen

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Recent studies have demonstrated how a material based on Mn oxide, supported by a polymeric matrix, shows an interesting H2 absorption capacity in non-drastic temperature and pressure conditions even if the reaction kinetics are particularly slow. In this study, therefore, two different percentages of Pt (5 and 10 wt%) were added to a composite sample, containing 50 wt% of Mn oxide, through a ball milling technique in order to verify the reduction in absorption kinetics of the quantity of added catalyst. The effect of the catalyst quantity on the composite matrix was investigated through morphological analyses of the SEM-EDX and TEM types, with which it was found that the distribution of Pt is more homogeneous compared to the sample containing 5%. XRD studies confirmed the simultaneous presence of the amorphous structure of the polymer and the crystalline structure of Pt, and absorption tests with the Sievert method verified a better kinetic reaction of the 10% Pt sample. In parallel, a modeling study, using the ab initio Density Functional Theory (DFT), was performed. The supercell for this study was Mn22Pt2O48. The number of H atoms gradually increased, starting from 2 (Mn22Pt2O48H2), where the initial desorption energy was 301 kJ/mol, to 211 kJ/mol for 12 H atoms (Mn22Pt2O48H12). From the experimental H2 absorption value (0.22 wt%), the number of respective H atoms was calculated (n = 5), and the corresponding desorption energy was equal to about 273 kJ/mol.

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