Self-healing catalysis in water
Principles for designing self-healing water-splitting catalysts are presented together with a formal kinetics model to account for the key chemical steps needed for self-healing. Self-healing may be realized if the catalysts are able to self-assemble at applied potentials less than that needed for c...
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| Veröffentlicht in: | Proceedings of the National Academy of Sciences - PNAS 2017-12, Vol.114 (51), p.13380-13384 |
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| container_title | Proceedings of the National Academy of Sciences - PNAS |
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| creator | Costentin, Cyrille Nocera, Daniel G. |
| description | Principles for designing self-healing water-splitting catalysts are presented together with a formal kinetics model to account for the key chemical steps needed for self-healing. Self-healing may be realized if the catalysts are able to self-assemble at applied potentials less than that needed for catalyst turnover. Solution pH provides a convenient handle for controlling the potential of these two processes, as demonstrated for the cobalt phosphate (CoPi) water-splitting catalyst. For Co2+ ion that appears in solution due to leaching from the catalyst during turnover, a quantitative description for the kinetics of the redeposition of the ion during the self-healing process has been derived. The model reveals that OER activity of CoPi occurs with negligible film dissolution in neutral pH for typical cell geometries and buffer concentrations. |
| doi_str_mv | 10.1073/pnas.1711836114 |
| format | Article |
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Self-healing may be realized if the catalysts are able to self-assemble at applied potentials less than that needed for catalyst turnover. Solution pH provides a convenient handle for controlling the potential of these two processes, as demonstrated for the cobalt phosphate (CoPi) water-splitting catalyst. For Co2+ ion that appears in solution due to leaching from the catalyst during turnover, a quantitative description for the kinetics of the redeposition of the ion during the self-healing process has been derived. 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Self-healing may be realized if the catalysts are able to self-assemble at applied potentials less than that needed for catalyst turnover. Solution pH provides a convenient handle for controlling the potential of these two processes, as demonstrated for the cobalt phosphate (CoPi) water-splitting catalyst. For Co2+ ion that appears in solution due to leaching from the catalyst during turnover, a quantitative description for the kinetics of the redeposition of the ion during the self-healing process has been derived. The model reveals that OER activity of CoPi occurs with negligible film dissolution in neutral pH for typical cell geometries and buffer concentrations.</description><subject>Carbon dioxide</subject><subject>Catalysis</subject><subject>Catalysts</subject><subject>Cobalt</subject><subject>cobalt phosphate</subject><subject>Dissolution</subject><subject>ENERGY STORAGE</subject><subject>INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY</subject><subject>Ions</subject><subject>Kinetics</subject><subject>Leaching</subject><subject>pH effects</subject><subject>Physical Sciences</subject><subject>Reaction kinetics</subject><subject>renewable energy storage</subject><subject>self-healing catalysis</subject><subject>SOLAR ENERGY</subject><subject>Splitting</subject><subject>Water splitting</subject><issn>0027-8424</issn><issn>1091-6490</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNpdkbtvFDEQxi0EIkegpgJO0NBsMmN7_WiQUMRLikQB1JbXmc35tGcfti8o_z0bbUiAaorvN988PsaeI5wgaHG6T76eoEY0QiHKB2yFYLFT0sJDtgLgujOSyyP2pNYtANjewGN2xI3Rsu9xxV59o2nsNuSnmC7XwTc_XddY1zGtf_lG5Sl7NPqp0rPbesx-fPzw_exzd_7105ez9-dd6IVqnRmtHcAbgdLQMHsrwTUaQhIkgw4EXkplJYQL1SOIMEpujZU6aBysHsQxe7f47g_Dji4CpVb85PYl7ny5dtlH96-S4sZd5ivX615qbWeD14tBri26GmKjsAk5JQrNodBmgd7eTin554Fqc7tYA02TT5QP1aEViiuJ0M_om__QbT6UNP_AceBSGhBczdTpQoWSay003m2M4G4ScjcJufuE5o6Xfx96x_-JZAZeLMC2tlzudSXNrArxG--yk2A</recordid><startdate>20171219</startdate><enddate>20171219</enddate><creator>Costentin, Cyrille</creator><creator>Nocera, Daniel G.</creator><general>National Academy of Sciences</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QG</scope><scope>7QL</scope><scope>7QP</scope><scope>7QR</scope><scope>7SN</scope><scope>7SS</scope><scope>7T5</scope><scope>7TK</scope><scope>7TM</scope><scope>7TO</scope><scope>7U9</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>H94</scope><scope>M7N</scope><scope>P64</scope><scope>RC3</scope><scope>7X8</scope><scope>OTOTI</scope><scope>5PM</scope><orcidid>https://orcid.org/0000-0002-7098-3132</orcidid><orcidid>https://orcid.org/0000-0001-5055-320X</orcidid><orcidid>https://orcid.org/0000000270983132</orcidid><orcidid>https://orcid.org/000000015055320X</orcidid></search><sort><creationdate>20171219</creationdate><title>Self-healing catalysis in water</title><author>Costentin, Cyrille ; 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Self-healing may be realized if the catalysts are able to self-assemble at applied potentials less than that needed for catalyst turnover. Solution pH provides a convenient handle for controlling the potential of these two processes, as demonstrated for the cobalt phosphate (CoPi) water-splitting catalyst. For Co2+ ion that appears in solution due to leaching from the catalyst during turnover, a quantitative description for the kinetics of the redeposition of the ion during the self-healing process has been derived. 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| subjects | Carbon dioxide Catalysis Catalysts Cobalt cobalt phosphate Dissolution ENERGY STORAGE INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY Ions Kinetics Leaching pH effects Physical Sciences Reaction kinetics renewable energy storage self-healing catalysis SOLAR ENERGY Splitting Water splitting |
| title | Self-healing catalysis in water |
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