Chae, S.Y. Kim, Y. Park, E.D. Im, S.H. Joo, O.-S. 2024-01-19T13:03:05Z 2024-01-19T13:03:05Z 2022-01-10 2021-12-15 1944-8244 https://pubs.kist.re.kr/handle/201004/115935 An atomic gradient passivation layer, (Ta,Mo)x(O,S)y, is designed to improve the charge transportation and photoelectrochemical activity of CuInS2-based photoelectrodes. We found that Mo spontaneously diffused to the a-TaOx layer during e-beam evaporation. This result indicates that the gradient profile of MoOx/TaOx is formed in the sublayer of (Ta,Mo)x(O,S)y. To understand the atomic-gradation effects of the (Ta,Mo)x(O,S)y passive layer, the composition and (photo)electrochemical properties have been characterized in detail. When this atomic gradient-passive layer is applied to CuInS2-based photocathodes, promising photocurrent and onset potential are seen without using Pt cocatalysts. This is one of the highest activities among reported CuInS2 photocathodes, which are not combined with noble metal cocatalysts. Excellent photoelectrochemical activity of the photoelectrode can be mainly achieved by (1) the electron transient time improved due to the conductive Mo-incorporated TaOx layer and (2) the boosted electrocatalytic activity by Mox(O,S)y formation. ？ 2021 American Chemical Society. English American Chemical Society Atoms Copper compounds Electrochemistry Field emission cathodes Indium compounds Molybdenum oxide Passivation Photocathodes Photocurrents Precious metals Charge transportation E beam evaporation Electrocatalytic activity Onset potential Passivation layer Photo-electrodes Photoelectrochemicals Transient time Sulfur compounds CuInS2Photocathodes with Atomic Gradation-Controlled (Ta,Mo) x(O,S) yPassivation Layers for Efficient Photoelectrochemical H2Production Article 10.1021/acsami.1c09560 1 ACS Applied Materials & Interfaces, v.13, no.49, pp.58447 - 58457 ACS Applied Materials & Interfaces 13 49 58447 58457 scie scopus 000752977200019 2-s2.0-85114640128 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article Atoms Copper compounds Electrochemistry Field emission cathodes Indium compounds Molybdenum oxide Passivation Photocathodes Photocurrents Precious metals Charge transportation E beam evaporation Electrocatalytic activity Onset potential Passivation layer Photo-electrodes Photoelectrochemicals Transient time Sulfur compounds atomic gradation CuInS2 passivation layer photoelectrochemical cell tantalum oxide