Effect of Water Vapor on Pt/TiO2/Ti Electromotive Force Cells
We study the humidity dependence of the generated current of Pt/TiO2/Ti electromotive force (emf) cells by means of microcalorimetry, current–voltage (I–V) characteristics, and electrochemical impedance spectroscopy. We prepare TiO2 with a high-voltage electrochemical anodization and the Pt electrod...
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| Veröffentlicht in: | Journal of physical chemistry. C 2016-05, Vol.120 (17), p.9061-9067 |
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| container_end_page | 9067 |
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| container_issue | 17 |
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| container_title | Journal of physical chemistry. C |
| container_volume | 120 |
| creator | Cakabay, Ö El Achhab, M Schierbaum, K |
| description | We study the humidity dependence of the generated current of Pt/TiO2/Ti electromotive force (emf) cells by means of microcalorimetry, current–voltage (I–V) characteristics, and electrochemical impedance spectroscopy. We prepare TiO2 with a high-voltage electrochemical anodization and the Pt electrode via a paste process. We find that short-circuit current densities (J sc) significantly vary by adding water vapor to the 2.1 vol % hydrogen-in-air mixture used to generate the emf, while the open-circuit voltage (V oc) always increases with increasing relative humidity (RH). J sc increases from 8.2 mA/cm2 (RH = 0%) to a maximum value of 9.4 mA/cm2 (RH = 10%). At RH > 10%, J sc decreases slightly. The increase in J sc is interpreted as enhanced electron transport as a consequence of the interaction of water with TiO2, while the decrease in J sc seems to be related to a large amount of water negatively affecting the rate-determining step for emf. |
| doi_str_mv | 10.1021/acs.jpcc.6b01315 |
| format | Article |
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We prepare TiO2 with a high-voltage electrochemical anodization and the Pt electrode via a paste process. We find that short-circuit current densities (J sc) significantly vary by adding water vapor to the 2.1 vol % hydrogen-in-air mixture used to generate the emf, while the open-circuit voltage (V oc) always increases with increasing relative humidity (RH). J sc increases from 8.2 mA/cm2 (RH = 0%) to a maximum value of 9.4 mA/cm2 (RH = 10%). At RH > 10%, J sc decreases slightly. The increase in J sc is interpreted as enhanced electron transport as a consequence of the interaction of water with TiO2, while the decrease in J sc seems to be related to a large amount of water negatively affecting the rate-determining step for emf.</description><identifier>ISSN: 1932-7447</identifier><identifier>EISSN: 1932-7455</identifier><identifier>DOI: 10.1021/acs.jpcc.6b01315</identifier><language>eng</language><publisher>American Chemical Society</publisher><ispartof>Journal of physical chemistry. 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C</addtitle><description>We study the humidity dependence of the generated current of Pt/TiO2/Ti electromotive force (emf) cells by means of microcalorimetry, current–voltage (I–V) characteristics, and electrochemical impedance spectroscopy. We prepare TiO2 with a high-voltage electrochemical anodization and the Pt electrode via a paste process. We find that short-circuit current densities (J sc) significantly vary by adding water vapor to the 2.1 vol % hydrogen-in-air mixture used to generate the emf, while the open-circuit voltage (V oc) always increases with increasing relative humidity (RH). J sc increases from 8.2 mA/cm2 (RH = 0%) to a maximum value of 9.4 mA/cm2 (RH = 10%). At RH > 10%, J sc decreases slightly. 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C</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Cakabay, Ö</au><au>El Achhab, M</au><au>Schierbaum, K</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of Water Vapor on Pt/TiO2/Ti Electromotive Force Cells</atitle><jtitle>Journal of physical chemistry. C</jtitle><addtitle>J. Phys. Chem. C</addtitle><date>2016-05-05</date><risdate>2016</risdate><volume>120</volume><issue>17</issue><spage>9061</spage><epage>9067</epage><pages>9061-9067</pages><issn>1932-7447</issn><eissn>1932-7455</eissn><abstract>We study the humidity dependence of the generated current of Pt/TiO2/Ti electromotive force (emf) cells by means of microcalorimetry, current–voltage (I–V) characteristics, and electrochemical impedance spectroscopy. We prepare TiO2 with a high-voltage electrochemical anodization and the Pt electrode via a paste process. We find that short-circuit current densities (J sc) significantly vary by adding water vapor to the 2.1 vol % hydrogen-in-air mixture used to generate the emf, while the open-circuit voltage (V oc) always increases with increasing relative humidity (RH). J sc increases from 8.2 mA/cm2 (RH = 0%) to a maximum value of 9.4 mA/cm2 (RH = 10%). At RH > 10%, J sc decreases slightly. The increase in J sc is interpreted as enhanced electron transport as a consequence of the interaction of water with TiO2, while the decrease in J sc seems to be related to a large amount of water negatively affecting the rate-determining step for emf.</abstract><pub>American Chemical Society</pub><doi>10.1021/acs.jpcc.6b01315</doi><tpages>7</tpages></addata></record> |
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| title | Effect of Water Vapor on Pt/TiO2/Ti Electromotive Force Cells |
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