SIMILARITY and DISCREPANCY of INORGANIC SOLID PROTONIC CONDUCTORS: HYDROXIDES and OXO ACID SALTS
1. Why is it necessary to discuss both general and particular properties of protonics?
The external similarity of processes of electric charge transfer by protons in sometimes extremely different materials seems rather strange because of significant discrepancy of other macroscopic properties of such materials. It is clearly even if to read chapter titles of brilliant survey of proton-conducting compounds published sixteen years ago by K.D.Kreuer [1]. He has divided them into four families: water-containing systems (WCS), oxo-acids and their salts (OAS), high-temperature proton conductors (HTPC) and organic/inorganic systems. Solid hydroxides of alkali metals were not included in this classification though they have became a subject of interest in the field of ionic conductors after successful application of KOH·0.5H2O as a molten electrolyte of fuel cells in the spacecraft. However, in the ensuing ~25 years (1980 – 2005) the number of publications dealing with investigation of the ionic conductivity of alkali metal hydroxides in solid state has hardly risen over two dozens (see [2 - 5] and references therein). This should be attributed primarily to the pessimistic conclusions inferred from assessment of the potential application of these compounds, which were based on their low conductivity and formation of noticeable amounts of impurities due to the interaction with the ambient medium [5].
2. Similarity and discrepancy in individual and complex alkaline hydroxides.
3. Special notes on electrochemical activity of new hydroxide protonics.
4. Similarity and discrepancy of complex hydroxides and oxo-acidic salts.
Full article in English is here:
SIMILARITY and DISCREPANCY of INORGANIC SOLID PROTONIC CONDUCTORS: HYDROXIDES and OXO ACID SALTS