O. Rubinkovskaya, V. Nevolin, D. Fominski, R. Romanov, P. Kartsev, V. Fominski, Hualin Jiang
{"title":"Study of the mechanism of photoactivated hydrogen evolution on a silicon photocathode with a-MoSx thin-film catalyst","authors":"O. Rubinkovskaya, V. Nevolin, D. Fominski, R. Romanov, P. Kartsev, V. Fominski, Hualin Jiang","doi":"10.30791/1028-978x-2022-11-5-15","DOIUrl":null,"url":null,"abstract":"Silicon cathodes for the efficient production of hydrogen in the photoelectrochemical process of water splitting have been created and studied. A photoactive layer on p-Si wafer was obtained by pulsed laser doping of the wafer with phosphorus from a solution of orthophosphoric acid. A film of amorphous molybdenum sulfide (a-MoSx) up to 4 nm thick was deposited on the surface of the modified n+p-Si wafer. This caused a significant increase in photocurrents in the acid solution as compared to the bare n+p-Si. The composition of the catalytic film was modified during the photoelectrochemical process of hydrogen evolution. The study of the energy bands at the interface of the a-MoSx heterojunction with the n+-Si layer showed that the reaction of hydrogen evolution proceeded, probably, because of electron tunneling through the a-MoSx film. Using the density functional theory, a thermodynamic analysis of the possible effect of chemical changes on the silicon surface and in the a-MoSx film itself on the efficiency of hydrogen catalysis was carried out.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":"38 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Perspektivnye Materialy","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.30791/1028-978x-2022-11-5-15","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Silicon cathodes for the efficient production of hydrogen in the photoelectrochemical process of water splitting have been created and studied. A photoactive layer on p-Si wafer was obtained by pulsed laser doping of the wafer with phosphorus from a solution of orthophosphoric acid. A film of amorphous molybdenum sulfide (a-MoSx) up to 4 nm thick was deposited on the surface of the modified n+p-Si wafer. This caused a significant increase in photocurrents in the acid solution as compared to the bare n+p-Si. The composition of the catalytic film was modified during the photoelectrochemical process of hydrogen evolution. The study of the energy bands at the interface of the a-MoSx heterojunction with the n+-Si layer showed that the reaction of hydrogen evolution proceeded, probably, because of electron tunneling through the a-MoSx film. Using the density functional theory, a thermodynamic analysis of the possible effect of chemical changes on the silicon surface and in the a-MoSx film itself on the efficiency of hydrogen catalysis was carried out.