When narrow-gap semiconductors were used in photoelectrochemical cells(PEC),the magnitude of the photo potential is insufficient to decompose water.To solve this problem,you can replace the anodic oxygen evolution reaction with another,for example,by the reaction of oxidation xS~2-←→S_x~(2-)+ 2(x-1)e~-[1,2].This process takes place with less overvoltage in the electrochemical system,which allows more efficiently converse a solar energy.In addition,for more efficient production of hydrogen,it is necessary that the cathode chamber is filled with electrolyte with pH = 1-2,and the anode chamber with electrolyte with pH = 13-14.The high pH difference in the anolyte and catholyte chambers causes the appearance of a chemical potential that promotes the processes of water decomposition in the photoelectrochemical cell.For long-term operation time of such systems,it is necessary to stabilize the electrolyte composition of the anolyte and catholyte chambers(as well as pH),which can be done using a membrane that excludes changes in pH,and the concentrations ions involved in an electrochemically reactions.We proposed to replace the traditionally used ion-conducting membrane MF4-SK(Nafion type)in such system with a ceramic membrane of the composition La_(0,56)Li_(0,33)TiО3(LaLiTiО3)which has high conductivity for lithium ions and additionally introduce into consist of electrolyte lithium compounds.Therefore,the purpose of this work was to determine the fundamental possibility of using a ceramic membrane based on LaLiTiO3 in a photoelectrochemical cell and to study the characteristics of this system.
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