{"id":8237,"date":"2022-07-25T14:08:02","date_gmt":"2022-07-25T05:08:02","guid":{"rendered":"https:\/\/physics.gist.ac.kr\/?post_type=research_news&p=8237"},"modified":"2024-01-16T14:57:25","modified_gmt":"2024-01-16T05:57:25","slug":"%eb%ac%b8%eb%b4%89%ec%a7%84-%ea%b5%90%ec%88%98co-%eb%b6%84%ec%9e%90-%ed%9d%a1%ec%b0%a9%ec%8b%9c-%eb%b0%9c%ec%83%9d%ed%95%98%eb%8a%94-%eb%b0%b1%ea%b8%88%ea%b3%bc-%eb%b0%b1%ea%b8%88%ed%95%a9%ea%b8%88","status":"publish","type":"research_news","link":"https:\/\/physics.gist.ac.kr\/en\/news-events\/research_highlights_news\/%eb%ac%b8%eb%b4%89%ec%a7%84-%ea%b5%90%ec%88%98co-%eb%b6%84%ec%9e%90-%ed%9d%a1%ec%b0%a9%ec%8b%9c-%eb%b0%9c%ec%83%9d%ed%95%98%eb%8a%94-%eb%b0%b1%ea%b8%88%ea%b3%bc-%eb%b0%b1%ea%b8%88%ed%95%a9%ea%b8%88\/","title":{"rendered":"[\ubb38\ubd09\uc9c4 \uad50\uc218]CO \ubd84\uc790 \ud761\ucc29\uc2dc \ubc1c\uc0dd\ud558\ub294 \ubc31\uae08\uacfc \ubc31\uae08\ud569\uae08\uc758 \ud45c\uba74\uc804\uc790\uad6c\uc870\ubcc0\uc704 \uad00\ucc30 – \uac01\ubd84\ud574 \uad11\uc804\uc790\ubd84\uad11\uae30(ARPES)\ub97c \ud65c\uc6a9 \uae08\uc18d\uacfc CO \ubd84\uc790\uac04\uc758 \uc804\uc790\ub760 \ubcc0\uc704\uacfc\uc815 \uaddc\uba85 (ACS Catalysis \ub17c\ubb38\uac8c\uc7ac)"},"content":{"rendered":"
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\"\"<\/figure>\n<\/div>\n\n\n

\uac01\ubd84\ud574 \uad11\uc804\uc790\ubd84\uad11\ubc95\uc744 \uc0ac\uc6a9\ud558\uc5ec \ud761\ucc29\ub41c \ubd84\uc790\uc640 \uae08\uc18d \uae30\ud310 \uc0ac\uc774\uc758 \uc804\ud558 \uc774\ub3d9, \uc989 Pt(111) \ubc0f Pt-Sn\/Pt(111) 2 \u00d7 2 \ud45c\uba74\uc5d0\uc11c CO\uc758 \ud654\ud559 \ud761\ucc29\uc5d0\uc11c \ubc1c\uc0dd\ud558\ub294 \uc804\ud558 \uc774\ub3d9\uc758 \uc9c1\uc811\uc801\uc778 \uc99d\uac70\ub97c \uad00\ucc30\ud558\uc600\ub2e4. \uad00\ucc30\ub41c \ubc34\ub4dc \uad6c\uc870\ub294 CO \ubd84\uc790\uac00 \ud761\ucc29\ub428\uc5d0 \ub530\ub77c \uc804\ud558 \uc774\ub3d9\uc758 \ub3c5\ud2b9\ud55c \ud2b9\uc131\uc744 \ubcf4\uc5ec\uc8fc\uc5c8\uc73c\uba70, \ud654\ud559 \ud761\ucc29 \uacfc\uc815\uc5d0 \ucc38\uc5ec\ud558\ub294 \uc804\uc790\uc758 \ud2b9\uc815 \uada4\ub3c4 \ud2b9\uc131\uc758 \uc5ed\ud560\uc744 \ubcf4\uc5ec\uc8fc\uc5c8\ub2e4. CO\uc758 \ud761\ucc29\uc591\uc774 \uc99d\uac00\ud568\uc5d0 \ub530\ub77c CO\uc640 Pt \uc0ac\uc774\uc758 \uc804\ud558 \uc774\ub3d9 \uc815\ub3c4\uac00 Pt-Sn\uc758 \uc804\ud558 \uc774\ub3d9 \uc815\ub3c4\uc640 \ubd84\uba85\ud55c \ucc28\uc774\ub97c \ubcf4\uc774\ub294 \uac83\uc744 \ud655\uc778\ud588\uc73c\uba70. \ubc00\ub3c4 \ud568\uc218 \uc774\ub860 \uacc4\uc0b0 \uacb0\uacfc\uc640 \ube44\uad50\ud558\uc5ec \ubc34\ub4dc \uad6c\uc870\uc5d0\uc11c \uad00\ucc30\ub41c \ub69c\ub837\ud55c \ud2b9\uc9d5\uc740 Pt \ubd84\uc790 \uc624\ube44\ud0c8\uacfc CO\uc758 2\u03c0 \uc624\ube44\ud0c8 \uc0ac\uc774\uc5d0 \ud615\uc131\ub41c Backdonation \uacb0\ud569 \uc0c1\ud0dc\ub85c \ud574\uc11d\ub418\uc5c8\ub2e4. \ub610\ud55c, Fermi \ud45c\uba74\uc801\uc740 Pt \ud45c\uba74\uc774 CO \ud761\ucc29 \uc2dc Pt-Sn \ud45c\uba74\ubcf4\ub2e4 \uc804\ud558 \ub18d\ub3c4 \ubcc0\ud654\uac00 \ub354 \ud06c\ub2e4\ub294 \uac83\uc744 \ubcf4\uc5ec\uc8fc\uc5c8\uc73c\uba70, \uc774\ub294 CO\uc758 \uc0c1\ud638 \uc791\uc6a9\uc5d0 \ub300\ud55c Sn\uc758 \uc5ed\ud560\uc744 \uac04\uc811\uc801\uc73c\ub85c \ubcf4\uc5ec\uc8fc\uc18c \uc788\ub2e4.<\/p>\n\n\n\n

Using angle-resolved photoemission spectroscopy, we show the direct evidence for charge transfer between adsorbed molecules and metal substrate, i.e. chemisorption of CO on Pt(111) and Pt-Sn\/Pt(111) 2×2 surfaces. The observed band structures show a unique signature of charge transfer as CO atoms are adsorbed, revealing the roles of specific orbital characters participating in the chemisorption process. As the coverage of CO increases, the degree of charge transfer between CO and Pt shows a clear difference to that of Pt-Sn. With comparison to DFT calculation results, the observed distinct features in the band structure are interpreted as back-donation bonding states formed between Pt molecular orbital and 2\u03c0 orbital of CO. Furthermore, the change inthe surface charge concentration, measured from the Fermi surface area, shows Pt surface has a larger charge concentration change than Pt-Sn surface upon CO adsorption. The difference in the charge concentration change between Pt and Pt-Sn surfaces reflects the degree of electronic effects during CO adsorption on Pt-Sn.<\/p>\n\n\n\n

Authors<\/strong>: JongkeunJung (FA, SNU), Sungwoo Kang, Laurent Nicola\u00ef, Jisook Hong, Jan Min\u00e1r, Inkyung Song,Wonshik Kyung, Soohyun Cho, Beomseo Kim, Jonathan D. Denlinger, Francisco J. C.S. Aires, Eric Ehret, Philip N. Ross, Jihoon Shim, Slavomir Nem\u0161\u00e1k, Doyoung Noh (GIST), Seungwu Han, Changyoung Kim (CA, SNU), Bongjin S. Mun (CA, GIST)<\/p>\n\n\n\n

Publication Date<\/strong>: 7 January 2022<\/p>\n\n\n\n

Journal Link(DOI)<\/strong>: https:\/\/doi.org\/10.1021\/acscatal.1c04566<\/a><\/p>\n\n\n\n

<\/p>\n\n\n\n

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