Thermodynamic analysis of metal oxides, metal peroxides and metal hydrides

Article Chemistry, Physical

Investigation on standard entropy change of metal hydrides and work function of metals

Yoshitsugu Kojima et al.

Summary: The study focused on the work function of metals as an index of ion binding property between metals and hydrogen, and analyzed the relationship between the standard entropy change of metal hydrides and the work function of metals (alloys). It was found that the standard entropy changes of alloy-based metal hydrides linearly increased with the work functions of the alloys, which also increased with the bulk modulus. Additionally, the standard entropy change was proportional to the standard heat of formation due to certain constant relationships between parameters.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2021)

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Article Chemistry, Physical

Thermodynamic analysis of ammonia storage materials

Yoshitsugu Kojima et al.

Summary: The thermodynamic analysis of ammonia storage materials revealed that the electronegativity of cations in metal chlorides and the electronegativity difference in metal halides play a crucial role in the stability of ammoniates. The stronger the binding energy, the smaller the entropy change caused by ammonia absorption. The standard entropy change Delta S-0 linearly increases with the natural logarithm of the volume difference Delta V of the ammonia storage materials.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2021)

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Article Chemistry, Multidisciplinary

Entropy differences between hydrides and other elements

Yoshitsugu Kojima et al.

Summary: The standard entropy differences between hydrides and other elements increase with volume differences, and can be roughly expressed by an equation involving the gas constant R.

CHEMICAL COMMUNICATIONS (2021)

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Article Chemistry, Physical