Effect of solution pH on morphology and electrochemical properties of cesium salts of phosphotungstic acid

Авторы: Baranov Alexander A., Domashnev Dmitry I., Leonova Lyudmila S., Belmesov Andrey A., Antonenko Anastasiia O., Nefedov Denis Yu, Shmygleva Lyubov V., Dobrovolsky Yury A.
Журнал: Materials Science and Engineering B
Том: 256
Год издания: 2020
Первая страница: 114544
DOI: 10.1016/j.mseb.2020.114544
Аннотация: Cesium salts of phosphotungstic acid CsxH3−xPW12O40 were synthesized in the pH range of the initial solutions are from 0 to 4. It has been shown that the Keggin structure is preserved in the entire pH range without the presence of other anions. At pH = 2.0, there is a sharp change in the composition of the cationic sublattice, particle sizes, specific surface area of the obtained particles, and total pore volume. At these pH values, the size of the crystallites forming particles of the salts obtained remains almost unchanged with a change in pH. In the obtained compounds, water does not enter the salt structure and its content correlates with the pore size inside the particles. The dependences of proton conductivity, conductivity activation energy, and electrocatalytic properties of the obtained cesium salts can also be divided into two regions of pH influence with a transition of pH = 2.0.
Добавил в систему: Баранов Александр Анатольевич

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