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

Alexander A. Baranov, Dmitry I. Domashnev, Lyudmila S. Leonova, Andrey A. Belmesov, Anastasiia O. Antonenko, Denis Yu Nefedov, Lyubov V. Shmygleva, Yury A. Dobrovolsky

Research output

Abstract

Cesium salts of phosphotungstic acid CsxH1−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.

Original languageEnglish
Article number114544
Number of pages7
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume256
DOIs
Publication statusPublished - Jun 2020

Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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