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Title</option><option value="z-title">Z-A By Title</option><option value="a-author">A-Z By Author</option><option value="z-author">Z-A By Author</option><option value="asc">Date Ascending</option><option value="desc">Date Descending</option></select></div></div><input type="hidden" name="start" form="facetForm" value="0"/></div><section class="c-scholworks"><div class="c-scholworks__main-column"><ul class="c-scholworks__tag-list"><li class="c-scholworks__tag-article">Article</li><li class="c-scholworks__tag-peer">Peer Reviewed</li></ul><div><h3 class="c-scholworks__heading"><a href="/uc/item/8vw0p8r0"><div class="c-clientmarkup">Direct observation of sequential oxidations of a titania-bound molecular proxy catalyst generated through illumination of molecular sensitizers</div></a></h3></div><div class="c-authorlist"><ul class="c-authorlist__list"><li class="c-authorlist__begin"><a href="/search/?q=author%3AChen%2C%20Hsiang-Yun">Chen, Hsiang-Yun</a>; </li><li class="c-authorlist__end"><a href="/search/?q=author%3AArdo%2C%20Shane">Ardo, Shane</a> </li></ul></div><div class="c-scholworks__publication"><a href="/uc/uci_postprints">UC Irvine Previously Published Works</a> (2018)</div><div class="c-scholworks__abstract"><div class="c-clientmarkup">Natural photosynthesis uses the energy in sunlight to oxidize or reduce reaction centres multiple times, therefore preparing each reaction centre for a multiple-electron-transfer reaction that will ultimately generate stable reaction products. This process relies on multiple chromophores per reaction centre to quickly generate the active state of the reaction centre and to outcompete deleterious charge recombination. Using a similar design principle, we report spectroscopic evidence for the generation of a twice-oxidized TiO<sub>2</sub>-bound molecular proxy catalyst after low-intensity visible-light excitation of co-anchored molecular Ru(II)-polypyridyl dyes. Electron transfer from an excited dye to TiO<sub>2</sub> generated a Ru(III) state that subsequently and repeatedly reacted with neighbouring Ru(II) dyes via self-exchange electron transfer to ultimately oxidize a distant co-anchored proxy catalyst before charge recombination. The largest yield for twice-oxidized proxy catalysts occurred when they were present at low coverage, suggesting that large dye/electrocatalyst ratios are also desired in dye-sensitized photoelectrochemical cells.</div></div><div class="c-scholworks__media"><ul class="c-medialist"></ul></div></div><div class="c-scholworks__ancillary"><a class="c-scholworks__thumbnail" href="/uc/item/8vw0p8r0"><img src="/cms-assets/29f30d0b0d8c6241debdd61b2246e3eb5c68607235b681e4d1730cd2be8a8df4" alt="Cover page: Direct observation of sequential oxidations of a titania-bound molecular proxy catalyst generated through illumination of molecular sensitizers"/></a><a href="https://creativecommons.org/licenses/by/4.0/" class="c-scholworks__license"><img class="c-lazyimage" data-src="/images/cc-by-small.svg" alt="Creative Commons 'BY' version 4.0 license"/></a></div></section><section class="c-scholworks"><div class="c-scholworks__main-column"><ul class="c-scholworks__tag-list"><li class="c-scholworks__tag-article">Article</li><li class="c-scholworks__tag-peer">Peer Reviewed</li></ul><div><h3 class="c-scholworks__heading"><a href="/uc/item/2nx0b3q9"><div class="c-clientmarkup">Direct evidence of molecular charge accumulation during solar excitation of molecular dyes, and guidelines for obtaining large quantum yields</div></a></h3></div><div class="c-authorlist"><ul class="c-authorlist__list"><li class="c-authorlist__begin"><a href="/search/?q=author%3AChen%2C%20Hsiang-Yun">Chen, Hsiang-Yun</a>; </li><li><a href="/search/?q=author%3ACardon%2C%20Joseph">Cardon, Joseph</a>; </li><li class="c-authorlist__end"><a href="/search/?q=author%3AArdo%2C%20Shane">Ardo, Shane</a> </li></ul></div><div class="c-scholworks__publication"><a href="/uc/uci_postprints">UC Irvine Previously Published Works</a> (2017)</div><div class="c-scholworks__media"><ul class="c-medialist"></ul></div></div><div class="c-scholworks__ancillary"><a class="c-scholworks__thumbnail" href="/uc/item/2nx0b3q9"><img src="/cms-assets/41214cf6aa24f7d89ad8f9d4067acee94e89923568f2dca20a82fb088484af0e" alt="Cover page: Direct evidence of molecular charge accumulation during solar excitation of molecular dyes, and guidelines for obtaining large quantum yields"/></a><a href="https://creativecommons.org/licenses/by/4.0/" class="c-scholworks__license"><img class="c-lazyimage" data-src="/images/cc-by-small.svg" alt="Creative Commons 'BY' version 4.0 license"/></a></div></section><section class="c-scholworks"><div class="c-scholworks__main-column"><ul class="c-scholworks__tag-list"><li class="c-scholworks__tag-article">Article</li><li class="c-scholworks__tag-peer">Peer Reviewed</li></ul><div><h3 class="c-scholworks__heading"><a href="/uc/item/1s45q06d"><div class="c-clientmarkup">Roles of self-exchange electron transfer between anchored metal-polypyridyl dyes to mesoporous metal-oxide thin films</div></a></h3></div><div class="c-authorlist"><ul class="c-authorlist__list"><li class="c-authorlist__begin"><a href="/search/?q=author%3AAngsono%2C%20Jacqueline">Angsono, Jacqueline</a>; </li><li><a href="/search/?q=author%3AGlancy-Logan%2C%20Jennifer">Glancy-Logan, Jennifer</a>; </li><li><a href="/search/?q=author%3AChen%2C%20Hsiang-Yun">Chen, Hsiang-Yun</a>; </li><li class="c-authorlist__end"><a href="/search/?q=author%3AArdo%2C%20Shane">Ardo, Shane</a> </li></ul></div><div class="c-scholworks__publication"><a href="/uc/uci_postprints">UC Irvine Previously Published Works</a> (2016)</div><div class="c-scholworks__media"><ul class="c-medialist"></ul></div></div><div class="c-scholworks__ancillary"><a class="c-scholworks__thumbnail" href="/uc/item/1s45q06d"><img src="/cms-assets/26f84b7c303b805bb6cc29b8967fcee14d712910e87acd6d0045c0ac998ba2f8" alt="Cover page: Roles of self-exchange electron transfer between anchored metal-polypyridyl dyes to mesoporous metal-oxide thin films"/></a><a href="https://creativecommons.org/licenses/by/4.0/" class="c-scholworks__license"><img class="c-lazyimage" data-src="/images/cc-by-small.svg" alt="Creative Commons 'BY' version 4.0 license"/></a></div></section><section class="c-scholworks"><div class="c-scholworks__main-column"><ul class="c-scholworks__tag-list"><li class="c-scholworks__tag-article">Article</li><li class="c-scholworks__tag-peer">Peer Reviewed</li></ul><div><h3 class="c-scholworks__heading"><a href="/uc/item/8n66176t"><div class="c-clientmarkup">New mechanisms in dye-sensitized solar cells: Catalyzing two-electron-transfer halide redox chemistry at sensitized TiO2</div></a></h3></div><div class="c-authorlist"><ul class="c-authorlist__list"><li class="c-authorlist__begin"><a href="/search/?q=author%3AChen%2C%20Hsiang-Yun">Chen, Hsiang-Yun</a>; </li><li><a href="/search/?q=author%3ACardon%2C%20Joseph">Cardon, Joseph</a>; </li><li><a href="/search/?q=author%3AAngsono%2C%20Jacqueline">Angsono, Jacqueline</a>; </li><li><a href="/search/?q=author%3AGlancy-Logan%2C%20Jennifer">Glancy-Logan, Jennifer</a>; </li><li class="c-authorlist__end"><a href="/search/?q=author%3AArdo%2C%20Shane">Ardo, Shane</a> </li></ul></div><div class="c-scholworks__publication"><a href="/uc/uci_postprints">UC Irvine Previously Published Works</a> (2016)</div><div class="c-scholworks__media"><ul class="c-medialist"></ul></div></div><div class="c-scholworks__ancillary"><a class="c-scholworks__thumbnail" href="/uc/item/8n66176t"><img src="/cms-assets/db1656f5f7bd8b940ba4fb13f723bfa9b2bd26ce71cb733e883859a9549f6d57" alt="Cover page: New mechanisms in dye-sensitized solar cells: Catalyzing two-electron-transfer halide redox chemistry at sensitized TiO2"/></a><a href="https://creativecommons.org/licenses/by/4.0/" class="c-scholworks__license"><img class="c-lazyimage" data-src="/images/cc-by-small.svg" alt="Creative Commons 'BY' version 4.0 license"/></a></div></section><section class="c-scholworks"><div class="c-scholworks__main-column"><ul class="c-scholworks__tag-list"><li class="c-scholworks__tag-article">Article</li><li class="c-scholworks__tag-peer">Peer Reviewed</li></ul><div><h3 class="c-scholworks__heading"><a href="/uc/item/4fb516g8"><div class="c-clientmarkup">Studies of self-exchange electron transfer and charge accumulation at sensitized TiO2 for multiple-electron-transfer chemistry using a series of amine-functionalized porphyrins</div></a></h3></div><div class="c-authorlist"><ul class="c-authorlist__list"><li class="c-authorlist__begin"><a href="/search/?q=author%3AGlancy-Logan%2C%20Jennifer">Glancy-Logan, Jennifer</a>; </li><li><a href="/search/?q=author%3AChen%2C%20Hsiang-Yun">Chen, Hsiang-Yun</a>; </li><li><a href="/search/?q=author%3ACardon%2C%20Joseph">Cardon, Joseph</a>; </li><li><a href="/search/?q=author%3AAngsono%2C%20Jacqueline">Angsono, Jacqueline</a>; </li><li class="c-authorlist__end"><a href="/search/?q=author%3AArdo%2C%20Shane">Ardo, Shane</a> </li></ul></div><div class="c-scholworks__publication"><a href="/uc/uci_postprints">UC Irvine Previously Published Works</a> (2016)</div><div class="c-scholworks__media"><ul class="c-medialist"></ul></div></div><div class="c-scholworks__ancillary"><a class="c-scholworks__thumbnail" href="/uc/item/4fb516g8"><img src="/cms-assets/b7b6237078215e021d53ac1992d54381a087fd7599a9c1e1b86071b927c7d702" alt="Cover page: Studies of self-exchange electron transfer and charge accumulation at sensitized TiO2 for multiple-electron-transfer chemistry using a series of amine-functionalized porphyrins"/></a><a href="https://creativecommons.org/licenses/by/4.0/" class="c-scholworks__license"><img class="c-lazyimage" data-src="/images/cc-by-small.svg" alt="Creative Commons 'BY' version 4.0 license"/></a></div></section><section class="c-scholworks"><div class="c-scholworks__main-column"><ul class="c-scholworks__tag-list"><li class="c-scholworks__tag-article">Article</li><li class="c-scholworks__tag-peer">Peer Reviewed</li></ul><div><h3 class="c-scholworks__heading"><a href="/uc/item/9js622qx"><div class="c-clientmarkup">Mechanistic studies of technologically-relevant dye-sensitized and cocatalyst-containing photocatalytic materials</div></a></h3></div><div class="c-authorlist"><ul class="c-authorlist__list"><li class="c-authorlist__begin"><a href="/search/?q=author%3ACardon%2C%20Joseph">Cardon, Joseph</a>; </li><li><a href="/search/?q=author%3AGaieck%2C%20William">Gaieck, William</a>; </li><li><a href="/search/?q=author%3ATkaczibson%2C%20Kevin">Tkaczibson, Kevin</a>; </li><li><a href="/search/?q=author%3AFarhang%2C%20Nazila">Farhang, Nazila</a>; </li><li><a href="/search/?q=author%3AKeene%2C%20Sam">Keene, Sam</a>; </li><li><a href="/search/?q=author%3ALuo%2C%20Simon">Luo, Simon</a>; </li><li><a href="/search/?q=author%3AChen%2C%20Hsiang-Yun">Chen, Hsiang-Yun</a>; </li><li class="c-authorlist__end"><a href="/search/?q=author%3AArdo%2C%20Shane">Ardo, Shane</a> </li></ul></div><div class="c-scholworks__publication"><a href="/uc/uci_postprints">UC Irvine Previously Published Works</a> (2019)</div><div class="c-scholworks__media"><ul class="c-medialist"></ul></div></div><div class="c-scholworks__ancillary"><a class="c-scholworks__thumbnail" href="/uc/item/9js622qx"><img src="/cms-assets/cc5bbaba6b970dca74c7569fd27fde93eb73e1b20d03c9400155cb9c61ca0879" alt="Cover page: Mechanistic studies of technologically-relevant dye-sensitized and cocatalyst-containing photocatalytic materials"/></a><a href="https://creativecommons.org/licenses/by/4.0/" class="c-scholworks__license"><img class="c-lazyimage" data-src="/images/cc-by-small.svg" alt="Creative Commons 'BY' version 4.0 license"/></a></div></section><section class="c-scholworks"><div class="c-scholworks__main-column"><ul class="c-scholworks__tag-list"><li class="c-scholworks__tag-article">Article</li><li class="c-scholworks__tag-peer">Peer Reviewed</li></ul><div><h3 class="c-scholworks__heading"><a href="/uc/item/0kh719qj"><div class="c-clientmarkup">Reconciliation of Differences in Apparent Diffusion Coefficients Measured for Self-Exchange Electron Transfer between Molecules Anchored to Mesoporous Titanium Dioxide Thin Films</div></a></h3></div><div class="c-authorlist"><ul class="c-authorlist__list"><li class="c-authorlist__begin"><a href="/search/?q=author%3ACardon%2C%20Joseph%20M">Cardon, Joseph M</a>; </li><li><a href="/search/?q=author%3AKrueper%2C%20Gregory">Krueper, Gregory</a>; </li><li><a href="/search/?q=author%3AKautz%2C%20Rylan">Kautz, Rylan</a>; </li><li><a href="/search/?q=author%3AFabian%2C%20David%20M">Fabian, David M</a>; </li><li><a href="/search/?q=author%3AAngsono%2C%20Jacqueline">Angsono, Jacqueline</a>; </li><li><a href="/search/?q=author%3AChen%2C%20Hsiang-Yun">Chen, Hsiang-Yun</a>; </li><li class="c-authorlist__end"><a href="/search/?q=author%3AArdo%2C%20Shane">Ardo, Shane</a> </li></ul></div><div class="c-scholworks__publication"><a href="/uc/uci_postprints">UC Irvine Previously Published Works</a> (2021)</div><div class="c-scholworks__abstract"><div class="c-clientmarkup">Redox-active sites present at large concentrations as part of a solid support or dissolved as molecules in fluid solutions undergo reversible self-exchange electron-transfer reactions. These processes can be monitored using a variety of techniques. Chronoamperometry and cyclic voltammetry are common techniques used to interrogate this behavior for molecules bound to mesoporous thin films of wide-bandgap semiconductors and insulators. In order to use these techniques to obtain accurate values for apparent diffusion coefficients, which are proxies for rate constants for self-exchange electron transfer, it is imperative to take into consideration nonidealities in redox titrations, parasitic currents, and ohmic resistances. Using spectroelectrochemical measurements taken concurrently with measurements of chronoamperometry data, we show that the spectroscopic data is not confounded from effects of parasitic currents or electroinactive dyes. However, we show that the thickness of the thin film over the region that is optically probed by the measurements must be known. When each of these considerations is included in data analyses, calculated apparent diffusion coefficients are, within error, independent of the method used to obtain the data. These considerations help reconcile variations in apparent diffusion coefficients measured using different techniques that have been reported over the past several decades and allow correct analyses to be performed in the future, independent of the method used to obtain the data.</div></div><div class="c-scholworks__media"><ul class="c-medialist"><li class="c-medialist__pdf">1 supplemental PDF</li></ul></div></div><div class="c-scholworks__ancillary"><a class="c-scholworks__thumbnail" href="/uc/item/0kh719qj"><img src="/cms-assets/63865fa26f841f2adc6d5c8f9146f7968d49790e1da8b4b2e3c7c81b23e54300" alt="Cover page: Reconciliation of Differences in Apparent Diffusion Coefficients Measured for Self-Exchange Electron Transfer between Molecules Anchored to Mesoporous Titanium Dioxide Thin Films"/></a><a href="https://creativecommons.org/licenses/by/4.0/" class="c-scholworks__license"><img class="c-lazyimage" data-src="/images/cc-by-small.svg" alt="Creative Commons 'BY' version 4.0 license"/></a></div></section><section class="c-scholworks"><div class="c-scholworks__main-column"><ul class="c-scholworks__tag-list"><li class="c-scholworks__tag-article">Article</li><li class="c-scholworks__tag-peer">Peer Reviewed</li></ul><div><h3 class="c-scholworks__heading"><a href="/uc/item/9pc8w0sw"><div class="c-clientmarkup">Photoelectrochemical characterization of infrared-absorbing osmium-polypyridyl dyes bound to TiO2</div></a></h3></div><div class="c-authorlist"><ul class="c-authorlist__list"><li class="c-authorlist__begin"><a href="/search/?q=author%3ACordon%2C%20Joseph">Cordon, Joseph</a>; </li><li><a href="/search/?q=author%3ATkaczibson%2C%20Kevin">Tkaczibson, Kevin</a>; </li><li><a href="/search/?q=author%3AHogrebe%2C%20Garrick">Hogrebe, Garrick</a>; </li><li><a href="/search/?q=author%3AFeltenberger%2C%20Cassidy">Feltenberger, Cassidy</a>; </li><li><a href="/search/?q=author%3AFarhang%2C%20Nazila">Farhang, Nazila</a>; </li><li><a href="/search/?q=author%3AKrueper%2C%20Gregory">Krueper, Gregory</a>; </li><li><a href="/search/?q=author%3AChen%2C%20Hsiang-Yun">Chen, Hsiang-Yun</a>; </li><li class="c-authorlist__end"><a href="/search/?q=author%3AArdo%2C%20Shane">Ardo, Shane</a> </li></ul></div><div class="c-scholworks__publication"><a href="/uc/uci_postprints">UC Irvine Previously Published Works</a> (2019)</div><div class="c-scholworks__media"><ul class="c-medialist"></ul></div></div><div class="c-scholworks__ancillary"><a class="c-scholworks__thumbnail" href="/uc/item/9pc8w0sw"><img src="/cms-assets/f4f5a1afb7fdeb34f9f5d72897ae451af5bdda001b78c5e6f4f65ada5308dfbb" alt="Cover page: Photoelectrochemical characterization of infrared-absorbing osmium-polypyridyl dyes bound to TiO2"/></a><a href="https://creativecommons.org/licenses/by/4.0/" class="c-scholworks__license"><img class="c-lazyimage" data-src="/images/cc-by-small.svg" alt="Creative Commons 'BY' version 4.0 license"/></a></div></section></section></main></form></div><div><div class="c-toplink"><a href="javascript:window.scrollTo(0, 0)">Top</a></div><footer class="c-footer"><nav class="c-footer__nav"><ul><li><a href="/">Home</a></li><li><a href="/aboutEschol">About eScholarship</a></li><li><a href="/campuses">Campus Sites</a></li><li><a href="/ucoapolicies">UC Open Access Policy</a></li><li><a href="/publishing">eScholarship Publishing</a></li><li><a href="https://www.cdlib.org/about/accessibility.html">Accessibility</a></li><li><a href="/privacypolicy">Privacy Statement</a></li><li><a href="/policies">Site Policies</a></li><li><a href="/terms">Terms of Use</a></li><li><a href="/login"><strong>Admin Login</strong></a></li><li><a href="https://help.escholarship.org"><strong>Help</strong></a></li></ul></nav><div class="c-footer__logo"><a href="/"><img class="c-lazyimage" data-src="/images/logo_footer-eschol.svg" alt="eScholarship, University of California"/></a></div><div class="c-footer__copyright">Powered by the<br/><a href="http://www.cdlib.org">California Digital Library</a><br/>Copyright 漏 2017<br/>The Regents of the University of California</div></footer></div></div></div></div> <script src="/js/vendors~app-bundle-2aefc956e545366a5d4e.js"></script> <script src="/js/app-bundle-3c8ebc2ec05dcc3202fd.js"></script> </body> </html>