{"title":"Ir（111）和Pt（111","authors":"Naoto Todoroki, Hiroto Tsurumaki, Arata Shinomiya, Toshimasa Wadayama","doi":"10.1002/elsa.202200007","DOIUrl":null,"url":null,"abstract":"<p>We investigated the oxygen evolution reaction (OER) activity changes of cobalt oxide (CoO<i><sub>x</sub></i>) thin films on Ir(111) and Pt(111) substrates by repeated OER measurements in 0.1 M KOH. Atomic force microscopy and X-ray photoelectron spectroscopy analysis of the as-prepared CoO<i><sub>x</sub></i>/Ir(111) and CoO<i><sub>x</sub></i>/Pt(111) showed similar surface morphologies of the CoO<i><sub>x</sub></i> thin films and almost the same OER overpotentials, which were estimated to be around 430 mV. However, after three OER measurements, the overpotential of CoO<i><sub>x</sub></i>/Ir(111) decreased by 70 mV, whereas that of CoO<i><sub>x</sub></i>/Pt(111) increased slightly. Structural analysis showed that CoO<i><sub>x</sub></i>/Ir(111) revealed the island-like nanostructures of CoO<i><sub>x</sub></i> dispersed on Ir(111) surface, accompanied by the generation of CoOOH. In contrast, for CoO<i><sub>x</sub></i>/Pt(111), the Pt(111) substrate remains covered by the CoO<i><sub>x</sub></i> thin film. The results suggest that the interaface at CoO<i><sub>x</sub></i> (CoOOH) nano-islands and Ir(111) substrate are responsible for reducing the OER overpotential.</p>","PeriodicalId":93746,"journal":{"name":"Electrochemical science advances","volume":"3 6","pages":""},"PeriodicalIF":2.9000,"publicationDate":"2022-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/elsa.202200007","citationCount":"1","resultStr":"{\"title\":\"Surface microstructures and oxygen evolution properties of cobalt oxide deposited on Ir(111) and Pt(111) single crystal substrates\",\"authors\":\"Naoto Todoroki, Hiroto Tsurumaki, Arata Shinomiya, Toshimasa Wadayama\",\"doi\":\"10.1002/elsa.202200007\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>We investigated the oxygen evolution reaction (OER) activity changes of cobalt oxide (CoO<i><sub>x</sub></i>) thin films on Ir(111) and Pt(111) substrates by repeated OER measurements in 0.1 M KOH. Atomic force microscopy and X-ray photoelectron spectroscopy analysis of the as-prepared CoO<i><sub>x</sub></i>/Ir(111) and CoO<i><sub>x</sub></i>/Pt(111) showed similar surface morphologies of the CoO<i><sub>x</sub></i> thin films and almost the same OER overpotentials, which were estimated to be around 430 mV. However, after three OER measurements, the overpotential of CoO<i><sub>x</sub></i>/Ir(111) decreased by 70 mV, whereas that of CoO<i><sub>x</sub></i>/Pt(111) increased slightly. Structural analysis showed that CoO<i><sub>x</sub></i>/Ir(111) revealed the island-like nanostructures of CoO<i><sub>x</sub></i> dispersed on Ir(111) surface, accompanied by the generation of CoOOH. In contrast, for CoO<i><sub>x</sub></i>/Pt(111), the Pt(111) substrate remains covered by the CoO<i><sub>x</sub></i> thin film. The results suggest that the interaface at CoO<i><sub>x</sub></i> (CoOOH) nano-islands and Ir(111) substrate are responsible for reducing the OER overpotential.</p>\",\"PeriodicalId\":93746,\"journal\":{\"name\":\"Electrochemical science advances\",\"volume\":\"3 6\",\"pages\":\"\"},\"PeriodicalIF\":2.9000,\"publicationDate\":\"2022-09-11\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/elsa.202200007\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Electrochemical science advances\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/elsa.202200007\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ELECTROCHEMISTRY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Electrochemical science advances","FirstCategoryId":"1085","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/elsa.202200007","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ELECTROCHEMISTRY","Score":null,"Total":0}
引用次数: 1
摘要
我们通过在 0.1 M KOH 中反复测量氧化钴（CoOx）薄膜在 Ir(111) 和 Pt(111) 基底上的氧演化反应（OER）活性变化进行了研究。对制备的 CoOx/Ir(111) 和 CoOx/Pt(111) 进行的原子力显微镜和 X 射线光电子能谱分析表明，CoOx 薄膜的表面形态相似，OER 过电位几乎相同，估计在 430 mV 左右。然而，经过三次 OER 测量后，CoOx/Ir(111) 的过电位下降了 70 mV，而 CoOx/Pt(111) 的过电位则略有上升。结构分析表明，CoOx/Ir(111)显示了分散在 Ir(111) 表面的岛状 CoOx 纳米结构，并伴随着 CoOOH 的生成。相反，对于 CoOx/Pt(111)，铂(111)基底仍然被 CoOx 薄膜覆盖。结果表明，CoOx（CoOOH）纳米带和 Ir（111）基底之间的界面是降低 OER 过电位的原因。
Surface microstructures and oxygen evolution properties of cobalt oxide deposited on Ir(111) and Pt(111) single crystal substrates
We investigated the oxygen evolution reaction (OER) activity changes of cobalt oxide (CoOx) thin films on Ir(111) and Pt(111) substrates by repeated OER measurements in 0.1 M KOH. Atomic force microscopy and X-ray photoelectron spectroscopy analysis of the as-prepared CoOx/Ir(111) and CoOx/Pt(111) showed similar surface morphologies of the CoOx thin films and almost the same OER overpotentials, which were estimated to be around 430 mV. However, after three OER measurements, the overpotential of CoOx/Ir(111) decreased by 70 mV, whereas that of CoOx/Pt(111) increased slightly. Structural analysis showed that CoOx/Ir(111) revealed the island-like nanostructures of CoOx dispersed on Ir(111) surface, accompanied by the generation of CoOOH. In contrast, for CoOx/Pt(111), the Pt(111) substrate remains covered by the CoOx thin film. The results suggest that the interaface at CoOx (CoOOH) nano-islands and Ir(111) substrate are responsible for reducing the OER overpotential.
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