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The proton conduction behavior of two 1D open-framework metal phosphates with similar crystal structures and different hydrogen bond networks.


ABSTRACT: Two open-framework zinc phosphates [C3N2H12][Zn(HPO4)2] (1) and [C6N4H22]0.5[Zn(HPO4)2] (2) were synthesized via hydrothermal reaction and characterized by powder X-ray diffraction, thermogravimetric analysis and scanning electron microscopy. Both compounds have a similar crystal structure and macroscopic morphology. However, the difference in equilibrium cations, in which the propylene diamine is for 1 and the triethylenetetramine is for 2, results in a significant distinction in the dense hydrogen grid. The diprotonated propylene diamine molecule in 1 is more favorable for forming a hydrogen-bond network in three dimensions than in 2, in which the twisted triethylenetetramine forms a hydrogen bond grid with the inorganic framework only in two dimensions owing to its large steric effect. This distinction further leads to a disparity in the proton conductivity of both compounds. The proton conductivity of 1 can reach 1.00 × 10-3 S cm-1 under ambient conditions (303 K and 75% RH) and then increase to 1.11 × 10-2 S cm-1 at 333 K and 99% RH, which is the highest value among the open-framework metal phosphate proton conductors operated in the same conduction. In contrast, the proton conductivity of 2 is four orders of magnitude smaller than 1 at 303 K and 75% RH and two orders smaller than 1 at 333 K and 99% RH.

SUBMITTER: Zhang KM 

PROVIDER: S-EPMC10183717 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature

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The proton conduction behavior of two 1D open-framework metal phosphates with similar crystal structures and different hydrogen bond networks.

Zhang Kai-Ming KM   Ji Min-Fang MF   Zhou Xue-Yi XY   Xuan Fang F   Duan Bo-Yuan BY   Yuan Yuan Y   Liu Guang-Xiang GX   Duan Hai-Bao HB   Zhao Hai-Rong HR  

RSC advances 20230401 19


Two open-framework zinc phosphates [C<sub>3</sub>N<sub>2</sub>H<sub>12</sub>][Zn(HPO<sub>4</sub>)<sub>2</sub>] (1) and [C<sub>6</sub>N<sub>4</sub>H<sub>22</sub>]<sub>0.5</sub>[Zn(HPO<sub>4</sub>)<sub>2</sub>] (2) were synthesized <i>via</i> hydrothermal reaction and characterized by powder X-ray diffraction, thermogravimetric analysis and scanning electron microscopy. Both compounds have a similar crystal structure and macroscopic morphology. However, the difference in equilibrium cations, in wh  ...[more]

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