Characteristics of the surface states produced on titanate photoanodes by mechanical polishing
Investigations using repetitive triangular potential sweeps and X-ray photo electron spectroscopy reveal that stable, surface-bound peroxotitanium species are produced without illumination on mechanically polished n-type SrTiO 3, SrTi 3O 7, BaTiO 3, BaTi 4O 9 and TiO 2 polycrystalline photoelectrode...
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| Veröffentlicht in: | Solar energy materials 1990, Vol.20 (4), p.307-321 |
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| creator | Kutty, T.R.N. Gomathi Devi, L. Avudaithai, M. |
| description | Investigations using repetitive triangular potential sweeps and X-ray photo electron spectroscopy reveal that stable, surface-bound peroxotitanium species are produced without illumination on mechanically polished n-type SrTiO
3, SrTi
3O
7, BaTiO
3, BaTi
4O
9 and TiO
2 polycrystalline photoelectrodes in alkaline media, under anodic polarization. Formation of peroxotitanium species is related to the chemical reactivity of the surface regions that incorporate the mechanically-induced crystalline defects, according to the scheme:
2
OH
s
− = (
O
2
2−)
s
+ 2
H
+ + 2
e
−
. Bulk flaws present the mechanically damaged surface region allow a quasi-isoenergetic transfer of electrons from the conduction band at the bulk to empty surface states (peroxo species). At much more anodic potential [
V
appl
≳ 0.45
V (
SCE)
], the Fermi level is pushed below the surface states and the electrons are transferred from ss to the CB via bulk flaws, leading to the underpotential evolution of oxygen:
(
O
2
2−)
s
=
O
2 + 2
e
−
. |
| doi_str_mv | 10.1016/0165-1633(90)90063-7 |
| format | Article |
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3, SrTi
3O
7, BaTiO
3, BaTi
4O
9 and TiO
2 polycrystalline photoelectrodes in alkaline media, under anodic polarization. Formation of peroxotitanium species is related to the chemical reactivity of the surface regions that incorporate the mechanically-induced crystalline defects, according to the scheme:
2
OH
s
− = (
O
2
2−)
s
+ 2
H
+ + 2
e
−
. Bulk flaws present the mechanically damaged surface region allow a quasi-isoenergetic transfer of electrons from the conduction band at the bulk to empty surface states (peroxo species). At much more anodic potential [
V
appl
≳ 0.45
V (
SCE)
], the Fermi level is pushed below the surface states and the electrons are transferred from ss to the CB via bulk flaws, leading to the underpotential evolution of oxygen:
(
O
2
2−)
s
=
O
2 + 2
e
−
.</description><identifier>ISSN: 0165-1633</identifier><identifier>DOI: 10.1016/0165-1633(90)90063-7</identifier><identifier>CODEN: SOEMDH</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Applied sciences ; chemical variables measurement ; Energy ; Exact sciences and technology ; Natural energy ; Photovoltaic conversion ; polishing ; Solar cells. Photoelectrochemical cells ; Solar energy ; surface properties ; titanates</subject><ispartof>Solar energy materials, 1990, Vol.20 (4), p.307-321</ispartof><rights>1990</rights><rights>1991 INIST-CNRS</rights><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c314t-ad825df83eddc0f77024770dd5df982dbcb3e74e4cd8097da9b3a76232851cae3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,778,782,4012,27910,27911,27912</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=19345445$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Kutty, T.R.N.</creatorcontrib><creatorcontrib>Gomathi Devi, L.</creatorcontrib><creatorcontrib>Avudaithai, M.</creatorcontrib><title>Characteristics of the surface states produced on titanate photoanodes by mechanical polishing</title><title>Solar energy materials</title><description>Investigations using repetitive triangular potential sweeps and X-ray photo electron spectroscopy reveal that stable, surface-bound peroxotitanium species are produced without illumination on mechanically polished n-type SrTiO
3, SrTi
3O
7, BaTiO
3, BaTi
4O
9 and TiO
2 polycrystalline photoelectrodes in alkaline media, under anodic polarization. Formation of peroxotitanium species is related to the chemical reactivity of the surface regions that incorporate the mechanically-induced crystalline defects, according to the scheme:
2
OH
s
− = (
O
2
2−)
s
+ 2
H
+ + 2
e
−
. Bulk flaws present the mechanically damaged surface region allow a quasi-isoenergetic transfer of electrons from the conduction band at the bulk to empty surface states (peroxo species). At much more anodic potential [
V
appl
≳ 0.45
V (
SCE)
], the Fermi level is pushed below the surface states and the electrons are transferred from ss to the CB via bulk flaws, leading to the underpotential evolution of oxygen:
(
O
2
2−)
s
=
O
2 + 2
e
−
.</description><subject>Applied sciences</subject><subject>chemical variables measurement</subject><subject>Energy</subject><subject>Exact sciences and technology</subject><subject>Natural energy</subject><subject>Photovoltaic conversion</subject><subject>polishing</subject><subject>Solar cells. Photoelectrochemical cells</subject><subject>Solar energy</subject><subject>surface properties</subject><subject>titanates</subject><issn>0165-1633</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1990</creationdate><recordtype>article</recordtype><recordid>eNp9kE1PxCAQhnvQxPXjH3jgotFDFUrpx8XEbPxKNvGiV8kUphbThRWoyf57WXejNw8wyZtnBubJslNGrxhl1XU6ImcV5xctvWwprXhe72Wz3_ggOwzhg9KCci5m2dt8AA8qojchGhWI60kckITJ96BSjRAxkJV3elKoibMkmgg2pWQ1uOjAOp2Abk2WqAawRsFIVm40YTD2_Tjb72EMeLKrR9nr_d3L_DFfPD88zW8XueKsjDnophC6bzhqrWhf17Qo06V1Ctum0J3qONYllko3tK01tB2Huip40QimAPlRdr6dmz76OWGIcmmCwnEEi24KshCiaXnFElhuQeVdCB57ufJmCX4tGZUbgXJjSm5MyZbKH4GyTm1nu_kQ0oK9B6tM-OtteSnKUiTuZsthWvbLoJdBGbTJnPGootTO_P_QN7_oiIQ</recordid><startdate>1990</startdate><enddate>1990</enddate><creator>Kutty, T.R.N.</creator><creator>Gomathi Devi, L.</creator><creator>Avudaithai, M.</creator><general>Elsevier B.V</general><general>Elsevier</general><general>North-Holland</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7SU</scope><scope>7U5</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>L7M</scope></search><sort><creationdate>1990</creationdate><title>Characteristics of the surface states produced on titanate photoanodes by mechanical polishing</title><author>Kutty, T.R.N. ; Gomathi Devi, L. ; Avudaithai, M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c314t-ad825df83eddc0f77024770dd5df982dbcb3e74e4cd8097da9b3a76232851cae3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1990</creationdate><topic>Applied sciences</topic><topic>chemical variables measurement</topic><topic>Energy</topic><topic>Exact sciences and technology</topic><topic>Natural energy</topic><topic>Photovoltaic conversion</topic><topic>polishing</topic><topic>Solar cells. Photoelectrochemical cells</topic><topic>Solar energy</topic><topic>surface properties</topic><topic>titanates</topic><toplevel>online_resources</toplevel><creatorcontrib>Kutty, T.R.N.</creatorcontrib><creatorcontrib>Gomathi Devi, L.</creatorcontrib><creatorcontrib>Avudaithai, M.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Environmental Engineering Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Solar energy materials</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kutty, T.R.N.</au><au>Gomathi Devi, L.</au><au>Avudaithai, M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Characteristics of the surface states produced on titanate photoanodes by mechanical polishing</atitle><jtitle>Solar energy materials</jtitle><date>1990</date><risdate>1990</risdate><volume>20</volume><issue>4</issue><spage>307</spage><epage>321</epage><pages>307-321</pages><issn>0165-1633</issn><coden>SOEMDH</coden><abstract>Investigations using repetitive triangular potential sweeps and X-ray photo electron spectroscopy reveal that stable, surface-bound peroxotitanium species are produced without illumination on mechanically polished n-type SrTiO
3, SrTi
3O
7, BaTiO
3, BaTi
4O
9 and TiO
2 polycrystalline photoelectrodes in alkaline media, under anodic polarization. Formation of peroxotitanium species is related to the chemical reactivity of the surface regions that incorporate the mechanically-induced crystalline defects, according to the scheme:
2
OH
s
− = (
O
2
2−)
s
+ 2
H
+ + 2
e
−
. Bulk flaws present the mechanically damaged surface region allow a quasi-isoenergetic transfer of electrons from the conduction band at the bulk to empty surface states (peroxo species). At much more anodic potential [
V
appl
≳ 0.45
V (
SCE)
], the Fermi level is pushed below the surface states and the electrons are transferred from ss to the CB via bulk flaws, leading to the underpotential evolution of oxygen:
(
O
2
2−)
s
=
O
2 + 2
e
−
.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/0165-1633(90)90063-7</doi><tpages>15</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0165-1633 |
| ispartof | Solar energy materials, 1990, Vol.20 (4), p.307-321 |
| issn | 0165-1633 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_25589361 |
| source | Alma/SFX Local Collection |
| subjects | Applied sciences chemical variables measurement Energy Exact sciences and technology Natural energy Photovoltaic conversion polishing Solar cells. Photoelectrochemical cells Solar energy surface properties titanates |
| title | Characteristics of the surface states produced on titanate photoanodes by mechanical polishing |
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