On the chemical state of Co oxide electrocatalysts during alkaline water splitting
Resonant inelastic X-ray scattering and high-resolution X-ray absorption spectroscopy were used to identify the chemical state of a Co electrocatalyst in situ during the oxygen evolution reaction. After anodic electrodeposition onto Au(111) from a Co(2+)-containing electrolyte, the chemical environm...
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| Veröffentlicht in: | Physical chemistry chemical physics : PCCP 2013-10, Vol.15 (40), p.17460-17467 |
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| creator | FRIEBEL, Daniel BAJDICH, Michal ALONSO-MORI, Roberto BELL, Alexis T NILSSON, Anders BOON SIANG YEO LOUIE, Mary W MILLER, Daniel J SANCHEZ CASALONGUE, Hernan MBUGA, Felix WENG, Tsu-Chien NORDLUND, Dennis SOKARAS, Dimosthenis |
| description | Resonant inelastic X-ray scattering and high-resolution X-ray absorption spectroscopy were used to identify the chemical state of a Co electrocatalyst in situ during the oxygen evolution reaction. After anodic electrodeposition onto Au(111) from a Co(2+)-containing electrolyte, the chemical environment of Co can be identified to be almost identical to CoOOH. With increasing potentials, a subtle increase of the Co oxidation state is observed, indicating a non-stoichiometric composition of the working OER catalyst containing a small fraction of Co(4+) sites. In order to confirm this interpretation, we used density functional theory with a Hubbard-U correction approach to compute X-ray absorption spectra of model compounds, which agree well with the experimental spectra. In situ monitoring of catalyst local structure and bonding is essential in the development of structure-activity relationships that can guide the discovery of efficient and earth abundant water splitting catalysts. |
| doi_str_mv | 10.1039/c3cp52981a |
| format | Article |
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In order to confirm this interpretation, we used density functional theory with a Hubbard-U correction approach to compute X-ray absorption spectra of model compounds, which agree well with the experimental spectra. In situ monitoring of catalyst local structure and bonding is essential in the development of structure-activity relationships that can guide the discovery of efficient and earth abundant water splitting catalysts.</description><subject>Absorption spectra</subject><subject>Absorption spectroscopy</subject><subject>Catalysts</subject><subject>Chemistry</subject><subject>Earth</subject><subject>Electrocatalysts</subject><subject>Electrochemistry</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Kinetics and mechanism of reactions</subject><subject>Spectra</subject><subject>Water splitting</subject><subject>X-rays</subject><issn>1463-9076</issn><issn>1463-9084</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNqF0d9rFDEQB_Agiv2hL_4BJQiFUjid2SSb7KMc_SEUClKfl-xs1ovmNtckR-1_38id7WOfJjCfDMN8GfuE8AVBdF9J0EY1nUH7hh2ibMWiAyPfPr91e8COcv4NAKhQvGcHjYSmhQYP2Y_bmZeV47Rya0828FxscTxOfBl5_OtHx11wVFIkW2x4zCXzcZv8_Ivb8McGPzv-UH8knjfBl1IbH9i7yYbsPu7rMft5eXG3vF7c3F59X367WZBEURakDaC2Yzs0gBPRAJ1paBglGik0OolycBIcaTlI1WmFSoBVOCmj2lF04ph93s2Nufg-ky-OVhTnua7bo9LQaVPR2Q5tUrzfulz6tc_kQrCzi9vco8EWtFLQvE7rWkp3QqhKz3eUUsw5uanfJL-26bFH6P9l0r9kUvHJfu52WLvxmf4PoYLTPbC5RjAlO5PPL05rY-pFxBOmipI_</recordid><startdate>20131028</startdate><enddate>20131028</enddate><creator>FRIEBEL, Daniel</creator><creator>BAJDICH, Michal</creator><creator>ALONSO-MORI, Roberto</creator><creator>BELL, Alexis T</creator><creator>NILSSON, Anders</creator><creator>BOON SIANG YEO</creator><creator>LOUIE, Mary W</creator><creator>MILLER, Daniel J</creator><creator>SANCHEZ CASALONGUE, Hernan</creator><creator>MBUGA, Felix</creator><creator>WENG, Tsu-Chien</creator><creator>NORDLUND, Dennis</creator><creator>SOKARAS, Dimosthenis</creator><general>Royal Society of Chemistry</general><scope>IQODW</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope><scope>OTOTI</scope></search><sort><creationdate>20131028</creationdate><title>On the chemical state of Co oxide electrocatalysts during alkaline water splitting</title><author>FRIEBEL, Daniel ; BAJDICH, Michal ; ALONSO-MORI, Roberto ; BELL, Alexis T ; NILSSON, Anders ; BOON SIANG YEO ; LOUIE, Mary W ; MILLER, Daniel J ; SANCHEZ CASALONGUE, Hernan ; MBUGA, Felix ; WENG, Tsu-Chien ; NORDLUND, Dennis ; SOKARAS, Dimosthenis</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c413t-c78017ad6b201fccb0982cbd4184371e414be40ec74b459751530a51f5856d393</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Absorption spectra</topic><topic>Absorption spectroscopy</topic><topic>Catalysts</topic><topic>Chemistry</topic><topic>Earth</topic><topic>Electrocatalysts</topic><topic>Electrochemistry</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><topic>Kinetics and mechanism of reactions</topic><topic>Spectra</topic><topic>Water splitting</topic><topic>X-rays</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>FRIEBEL, Daniel</creatorcontrib><creatorcontrib>BAJDICH, Michal</creatorcontrib><creatorcontrib>ALONSO-MORI, Roberto</creatorcontrib><creatorcontrib>BELL, Alexis T</creatorcontrib><creatorcontrib>NILSSON, Anders</creatorcontrib><creatorcontrib>BOON SIANG YEO</creatorcontrib><creatorcontrib>LOUIE, Mary W</creatorcontrib><creatorcontrib>MILLER, Daniel J</creatorcontrib><creatorcontrib>SANCHEZ CASALONGUE, Hernan</creatorcontrib><creatorcontrib>MBUGA, Felix</creatorcontrib><creatorcontrib>WENG, Tsu-Chien</creatorcontrib><creatorcontrib>NORDLUND, Dennis</creatorcontrib><creatorcontrib>SOKARAS, Dimosthenis</creatorcontrib><creatorcontrib>Lawrence Berkeley National Lab. 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| source | Royal Society Of Chemistry Journals 2008-; Alma/SFX Local Collection |
| subjects | Absorption spectra Absorption spectroscopy Catalysts Chemistry Earth Electrocatalysts Electrochemistry Exact sciences and technology General and physical chemistry Kinetics and mechanism of reactions Spectra Water splitting X-rays |
| title | On the chemical state of Co oxide electrocatalysts during alkaline water splitting |
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