World experience defines hydrogen as the most perspective energy carrier. Producing hydrogen by electrolysis helps effectively solve the problem of peak loads and failures arising from the different structure of energy consumption during the day .

Thermoelectrochemical cycles of producing hydrogen are intensively studied in Kharkov Polytechnic Institute, Kharkov, Ukraine. Further development of  hydrogen production by electrolysis of water associated with implementation of Hybrid Sulfur cycle  or "Westinghouse cycle") [1]. It is a two–step process, first a low–temperature electrochemical step (1):

2H₂O + SO₂ H₂ + H₂SO₄                 (1)

and second a high temperature (2):

H₂SO₄ H₂O + SO₂ + 0,5 O₂                  (2)

   The clear advantage of the Hybrid Sulfur Cycle process is that the standard reversible voltage E₀ of the net cell reaction (2) is only 0.17 V. For comparison, conventional water electrolysis requires E₀ = 1.23 V. In laboratory–scale tests, the realized cell voltage of SO₂ depolarization electrolysis has been 0.5¼1.3 V, depending on the current density and other operational parameters compared with the 1.8¼2.0 V of commercial alkaline water electrolysis. Thus, SO₂ depolarization electrolysis would require 25¼60 % of the electrical energy required for direct water splitting by conventional electrolysis. The electrochemical process is far from technical implementation and intensively studied in recent years.Hybrid Sulfur cycle was intensively studied for practical implementation with using platinum, gold and palladium anodes . Further investigation is connected with using more affordable anode materials. According to the E–pH diagram, ruthenium, molybdenum, tungsten and their oxides are defined to be most perspective catalytic materials.

 Active porous anode was obtained by covering the graphite basis by active carbon, Pt, MoO₃, RuO₂, WO₃. Covering with active carbon was prepared by impregnating the graphite basis in sugar solution, followed by drying and thermal decomposition. The other composite coatings were prepared by impregnating a sugar solution and brine H₂[PtCl₆], (NH₄)₆Mo₇O₂₄·4H₂O, (NH₄)₄W₅O₁₇, followed by drying and thermal decomposition at 600...650 K. The cylindrical anodes have diameter 20 mm and thickness 5 mm.

          They were inserted into a special current source, consisting of a current–conducting tubes with welded sample holder (Fig. 1). Samples were fixed in a holder nut. Current supply material – titanium coated PTFE. Current–voltage measurements were carried out in plastic cell with anode and cathode separation space cation exchange membrane. Electrode potentials were measured relative to a mercury sulfate reference electrode and converted to the normal hydrogen electrode.