Kim, Jin Yeong Choi, Jihui Kim, Ho Young Hwang, Eunkyoung Kim, Hyoung-Juhn Ahn, Sang Hyun Kim, Soo-Kil 2024-01-20T05:31:35Z 2024-01-20T05:31:35Z 2022-01-25 2015-12 0169-4332 https://pubs.kist.re.kr/handle/201004/124652 The activity and stability of Ru metal and its thermal oxide films for the oxygen evolution reaction (OER) were investigated. The metallic Ru films were prepared by electrodeposition on a Ti substrate and then thermally oxidized at various temperatures under atmospheric conditions. During long-term operation of the OER with cyclic voltammetry (CV) in H2SO4 electrolyte, changes in the properties of the Ru and its thermal oxides were monitored in terms of their morphology, crystal structure, and electronic structure. In the initial stages of the OER, all of the Ru thermal oxide films underwent an activation process that was related to the continuous removal of low-activity Ru oxides from the surface. With further cycling, the OER activity decreased. The rate of decrease was different for each Ru film and was related to the annealing temperatures. Monitoring of material properties indicates that the amount of stable anhydrous RuO2 is important for OER stability because it prevents both the severe dissolution of metallic Ru beneath the oxide surface and the formation of a less active hydrous RuO2 at the surface. (C) 2015 Elsevier B.V. All rights reserved. English ELSEVIER Activity and stability of the oxygen evolution reaction on electrodeposited Ru and its thermal oxides Article 10.1016/j.apsusc.2015.10.082 1 APPLIED SURFACE SCIENCE, v.359, pp.227 - 235 APPLIED SURFACE SCIENCE 359 227 235 N scie scopus 000366220600033 2-s2.0-84961177330 Chemistry, Physical Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Chemistry Materials Science Physics Article HYDROUS RUTHENIUM OXIDE THIN-FILMS WATER XPS ELECTROCATALYSIS DISSOLUTION OXIDATION CATALYSTS PLATINUM IRIDIUM Water splitting Oxygen evolution reaction Electrodeposited ruthenium catalyst Anhydrous ruthenium oxide