Physicochemical Property Investigations of Perovskite-Type Layer Crystals [NH₃(CH₂) _n NH₃]CdCl₄ (n = 2, 3, and 4) as a Function of Length n of CH₂.

ABSTRACT: Hybrid perovskites have potential applications in several electrochemical devices such as supercapacitors, batteries, and fuel cells. Here, the thermal stabilities as a function of the length n of the CH₂ groups in [NH₃(CH₂) _n NH₃]CdCl₄ (n = 2, 3, and 4) crystals were considered by TGA and DTA. The structural characteristics and molecular dynamics were studied by MAS and static NMR experiments. A comparison of spin-lattice relaxation times indicated that the organic cation containing ¹H and ¹³C was significantly more flexible than the inorganic anion containing ¹¹³Cd. The flexibility of ¹H increased with an increase in the length of CH₂ in the carbon chain, resulting in a decrease in the activation energy (E _a) of ¹H. The E _a of ¹³C at n = 3 and 4 was more flexible at high temperatures than at low temperatures. In contrast, the E _a of ¹³C at n = 2 was more flexible at low temperatures. These results provide insight into the thermal stability and molecular dynamics of these crystals as a function of the length n of CH₂ groups in the carbon chain and are expected to facilitate applications.

SUBMITTER: Lim AR 

PROVIDER: S-EPMC8529888 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature