Abstract
The electrochemical behavior of tungsten in chloride electrolytes with various cationic compositions (Na+, K+, Li+, NH4+) under pulse alternating current has been studied. The decisive influence of the nature of the electrolyte on the phase composition of the resulting dispersed products is shown. The use of NH4Cl ensures the formation of pure crystalline WO3 with a particle size of 30–35 nm. The photoelectrochemical activity of the synthesized WO3 in a sulfuric acid medium under simulated solar radiation has been studied. The addition of glycerol to H2SO4 causes a cathodic shift in the oxidation onset potential by 0.25 V and a threefold increase in the maximum photocurrent density. The possibility of using a WO3/FTO photoanode as part of a flow-through photocatalytic fuel cell (fuel - glycerol, air-breathing Pt/C cathode), characterized by excellent stability in an acidic environment and the maximum power density of 64.0 μW cm-2 is shown.
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