Characterization of potassium salts of 12-tungstophosphoric acid

Journal Article · Mon Nov 15 04:00:00 EST 2010 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2010.06.064· OSTI ID:22202860

Mioc, U. B. ^[1]; Todorovic, M. ^[2]; Jovanovic, Z. ^[3]; Davidovic, M. ^[4]; Bajuk-Bogdanovic, D. ^[1]; Lausevic, Z. ^[3]

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1. Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, P.O. Box 47, 11158 Belgrade (Serbia)
2. Faculty of Chemistry, University of Belgrade, P.O. Box. 158, 11001 Belgrade (Serbia)
3. Vinca Institute of Nuclear Sciences, P.O. Box 522, 11001 Belgrade (Serbia)
4. Institute Gosa, Milana Rakica 35, 11001 Belgrade (Serbia)

Potassium salts of 12-tungstophosphoric acid with varying amounts of cation, K{sub x}H{sub 3-x}PW{sub 12}O{sub 40} (x = 1, 2, 3) have been prepared and their characteristics investigated by thermal analyses, FT-IR and micro-Raman spectroscopy and SEM-EDS analysis. It was found that the number of replaced protons by potassium ions in the 12-tungstophosphoric acid structure has influence on the presence of different protonic species, their dynamic equilibrium and on the conductivity of salts. The results reported in this study have been applied to improve the structural model of insoluble acidic salts. It is shown that an acidic potassium salt presents a mixture of neutral salt and unreacted acid. The nature of this mixture depends on the number of replaced protons-oxonium ions by cations. Preliminary measurements with synthesized compounds as solid electrolytes in fuel cells have been done, too.

• OSTI ID: 22202860
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 11 Vol. 45; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
FOURIER TRANSFORMATION
FUEL CELLS
INFRARED SPECTRA
POTASSIUM
POTASSIUM IONS
PROTON CONDUCTIVITY
PROTONS
RAMAN SPECTROSCOPY
SALTS
SCANNING ELECTRON MICROSCOPY
STRUCTURAL MODELS
SUPERCONDUCTORS
THERMAL GRAVIMETRIC ANALYSIS
TUNGSTOPHOSPHORIC ACID