Nanostructured Ta3N5 Films as Visible-Light Active Photoanodes for Water Oxidation
Nanostructured Ta3N5 photoanodes (band gap of ∼2.0 eV) were synthesized via a two-step process: first, nanocolumnar Ta2O5 films were deposited by evaporation of tantalum metal in a vacuum chamber in a low pressure oxygen ambient followed by heating in an ammonia gas flow to convert Ta2O5 into orthor...
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| Veröffentlicht in: | Journal of physical chemistry. C 2012-09, Vol.116 (36), p.19225-19232 |
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| container_end_page | 19232 |
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| container_issue | 36 |
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| container_title | Journal of physical chemistry. C |
| container_volume | 116 |
| creator | Dang, Hoang X Hahn, Nathan T Park, Hyun S Bard, Allen J Mullins, C. Buddie |
| description | Nanostructured Ta3N5 photoanodes (band gap of ∼2.0 eV) were synthesized via a two-step process: first, nanocolumnar Ta2O5 films were deposited by evaporation of tantalum metal in a vacuum chamber in a low pressure oxygen ambient followed by heating in an ammonia gas flow to convert Ta2O5 into orthorhombic Ta3N5. Under Xe lamp irradiation (∼73 mW/cm2), a 100 nm nanoporous Ta3N5 electrode achieved an anodic photocurrent of ∼1.4 mA/cm2 at +0.5 V versus Ag/AgCl in 1 M KOH solution. By comparison, a dense film achieved ∼0.4 mA/cm2 clearly illustrating the importance of nanostructuring for improving the performance of Ta3N5 photoanodes. However, Ta3N5 films suffered from inherent self-oxidation under light illumination, and application of a cobalt cocatalyst layer was found to improve the stability as well as photocatalytic activity of the Ta3N5 films. |
| doi_str_mv | 10.1021/jp307369z |
| format | Article |
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Buddie</creator><creatorcontrib>Dang, Hoang X ; Hahn, Nathan T ; Park, Hyun S ; Bard, Allen J ; Mullins, C. Buddie</creatorcontrib><description>Nanostructured Ta3N5 photoanodes (band gap of ∼2.0 eV) were synthesized via a two-step process: first, nanocolumnar Ta2O5 films were deposited by evaporation of tantalum metal in a vacuum chamber in a low pressure oxygen ambient followed by heating in an ammonia gas flow to convert Ta2O5 into orthorhombic Ta3N5. Under Xe lamp irradiation (∼73 mW/cm2), a 100 nm nanoporous Ta3N5 electrode achieved an anodic photocurrent of ∼1.4 mA/cm2 at +0.5 V versus Ag/AgCl in 1 M KOH solution. By comparison, a dense film achieved ∼0.4 mA/cm2 clearly illustrating the importance of nanostructuring for improving the performance of Ta3N5 photoanodes. However, Ta3N5 films suffered from inherent self-oxidation under light illumination, and application of a cobalt cocatalyst layer was found to improve the stability as well as photocatalytic activity of the Ta3N5 films.</description><identifier>ISSN: 1932-7447</identifier><identifier>EISSN: 1932-7455</identifier><identifier>DOI: 10.1021/jp307369z</identifier><language>eng</language><publisher>Columbus, OH: American Chemical Society</publisher><subject>Chemistry ; Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Condensed matter: structure, mechanical and thermal properties ; Electrochemistry ; Electrodes: preparations and properties ; Electron states and collective excitations in thin films, multilayers, quantum wells, mesoscopic and nanoscale systems ; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures ; Electronic transport in multilayers, nanoscale materials and structures ; Exact sciences and technology ; General and physical chemistry ; Nanocrystalline materials ; Physics ; Radiation effects on specific materials ; Structure of solids and liquids; crystallography</subject><ispartof>Journal of physical chemistry. 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Buddie</creatorcontrib><title>Nanostructured Ta3N5 Films as Visible-Light Active Photoanodes for Water Oxidation</title><title>Journal of physical chemistry. C</title><addtitle>J. Phys. Chem. C</addtitle><description>Nanostructured Ta3N5 photoanodes (band gap of ∼2.0 eV) were synthesized via a two-step process: first, nanocolumnar Ta2O5 films were deposited by evaporation of tantalum metal in a vacuum chamber in a low pressure oxygen ambient followed by heating in an ammonia gas flow to convert Ta2O5 into orthorhombic Ta3N5. Under Xe lamp irradiation (∼73 mW/cm2), a 100 nm nanoporous Ta3N5 electrode achieved an anodic photocurrent of ∼1.4 mA/cm2 at +0.5 V versus Ag/AgCl in 1 M KOH solution. By comparison, a dense film achieved ∼0.4 mA/cm2 clearly illustrating the importance of nanostructuring for improving the performance of Ta3N5 photoanodes. However, Ta3N5 films suffered from inherent self-oxidation under light illumination, and application of a cobalt cocatalyst layer was found to improve the stability as well as photocatalytic activity of the Ta3N5 films.</description><subject>Chemistry</subject><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties</subject><subject>Condensed matter: structure, mechanical and thermal properties</subject><subject>Electrochemistry</subject><subject>Electrodes: preparations and properties</subject><subject>Electron states and collective excitations in thin films, multilayers, quantum wells, mesoscopic and nanoscale systems</subject><subject>Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures</subject><subject>Electronic transport in multilayers, nanoscale materials and structures</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Nanocrystalline materials</subject><subject>Physics</subject><subject>Radiation effects on specific materials</subject><subject>Structure of solids and liquids; crystallography</subject><issn>1932-7447</issn><issn>1932-7455</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNpFkDFPwzAUhC0EEqUw8A-8MAb8_GKnGauKAlLUIlRgjF5ih7pKk8p2EfDrCQKV6W64O50-xi5BXIOQcLPZochQ519HbAQ5yiRLlTo--DQ7ZWchbIRQKABH7GlBXR-i39dx763hK8KF4nPXbgOnwF9ccFVrk8K9rSOf1tG9W_647mM_1IwNvOk9f6VoPV9-OEPR9d05O2moDfbiT8fseX67mt0nxfLuYTYtEpIAMQHASltbpWgNZoPkVWMn0iKRVVJoLSZUGcLKQNbUSmtLUEuVI0hljFY4Zle_uzsKNbWNp652odx5tyX_WUo9YEhz-M9RHcpNv_fd8KoEUf4AKw_A8Bt9yF2v</recordid><startdate>20120913</startdate><enddate>20120913</enddate><creator>Dang, Hoang X</creator><creator>Hahn, Nathan T</creator><creator>Park, Hyun S</creator><creator>Bard, Allen J</creator><creator>Mullins, C. 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C</addtitle><date>2012-09-13</date><risdate>2012</risdate><volume>116</volume><issue>36</issue><spage>19225</spage><epage>19232</epage><pages>19225-19232</pages><issn>1932-7447</issn><eissn>1932-7455</eissn><abstract>Nanostructured Ta3N5 photoanodes (band gap of ∼2.0 eV) were synthesized via a two-step process: first, nanocolumnar Ta2O5 films were deposited by evaporation of tantalum metal in a vacuum chamber in a low pressure oxygen ambient followed by heating in an ammonia gas flow to convert Ta2O5 into orthorhombic Ta3N5. Under Xe lamp irradiation (∼73 mW/cm2), a 100 nm nanoporous Ta3N5 electrode achieved an anodic photocurrent of ∼1.4 mA/cm2 at +0.5 V versus Ag/AgCl in 1 M KOH solution. By comparison, a dense film achieved ∼0.4 mA/cm2 clearly illustrating the importance of nanostructuring for improving the performance of Ta3N5 photoanodes. However, Ta3N5 films suffered from inherent self-oxidation under light illumination, and application of a cobalt cocatalyst layer was found to improve the stability as well as photocatalytic activity of the Ta3N5 films.</abstract><cop>Columbus, OH</cop><pub>American Chemical Society</pub><doi>10.1021/jp307369z</doi><tpages>8</tpages></addata></record> |
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| source | ACS Publications |
| subjects | Chemistry Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Electrochemistry Electrodes: preparations and properties Electron states and collective excitations in thin films, multilayers, quantum wells, mesoscopic and nanoscale systems Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures Electronic transport in multilayers, nanoscale materials and structures Exact sciences and technology General and physical chemistry Nanocrystalline materials Physics Radiation effects on specific materials Structure of solids and liquids crystallography |
| title | Nanostructured Ta3N5 Films as Visible-Light Active Photoanodes for Water Oxidation |
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