Hot Electron Collection on Brookite Nanorods Lateral Facets for Plasmon-Enhanced Water Oxidation
| Autor: | Tersilla Virgili, Vladimiro Dal Santo, Chiara Liliana Boldrini, Marta M. Mróz, Ismael Romero-Ocaña, Alberto Naldoni, Francesco Malara, Alessandro Beltram, Tiziano Montini, Marcello Marelli, Juan José Delgado, Paolo Fornasiero |
|---|---|
| Přispěvatelé: | Naldoni, Alberto, Montini, Tiziano, Malara, Francesco, Mróz, Marta M., Beltram, Alessandro, Virgili, Tersilla, Boldrini, Chiara L., Marelli, Marcello, ROMERO OCAÑA, Ismael, Delgado, Juan José, Dal Santo, Vladimiro, Fornasiero, Paolo, Naldoni, A, Montini, T, Malara, F, Mroz, M, Beltram, A, Virgili, T, Boldrini, C, Marelli, M, Romero-Ocana, I, Delgado, J, Dal Santo, V, Fornasiero, P |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
surface plasmon Nanoparticle hydrogen peroxide 02 engineering and technology 010402 general chemistry Photochemistry 01 natural sciences 7. Clean energy Catalysis chemistry.chemical_compound selective oxidations shape controlled surface plasmons titanium dioxide Plasmon Photocurrent Brookite Surface plasmon General Chemistry 021001 nanoscience & nanotechnology selective oxidation 0104 chemical sciences chemistry visual_art Titanium dioxide Photocatalysis visual_art.visual_art_medium Nanorod 0210 nano-technology |
| Zdroj: | ACS catalysis 7 (2017): 1270–1278. doi:10.1021/acscatal.6b03092 info:cnr-pdr/source/autori:Alberto Naldoni, Tiziano Montini, Francesco Malara, Marta M. Mróz, Alessandro Beltram, Tersilla Virgili, Chiara L. Boldrini, Marcello Marelli, Ismael Romero-Ocaña, Juan José Delgado, Vladimiro Dal Santo, and Paolo Fornasiero/titolo:Hot electron collection on brookite nanorods lateral facets for plasmon-enhanced water oxidation/doi:10.1021%2Facscatal.6b03092/rivista:ACS catalysis/anno:2017/pagina_da:1270/pagina_a:1278/intervallo_pagine:1270–1278/volume:7 |
| DOI: | 10.1021/acscatal.6b03092 |
| Popis: | Photocatalytic reactions could enhance the share of chemicals produced through renewable sources. The efficiency of photocatalysts drastically depends on light absorption, on the surface energy of the crystals, and on the properties of the nanobuilding blocks assembled in devices. Here, we show that photoelectrochemical water oxidation on brookite TiO2 nanorods is greatly enhanced by engineering the location of Au nanoparticles deposition. Brookite photoanodes show a very low onset potential for water oxidation to H2O2 of -0.2 VRHE due to energetics of exposed crystal facets. By combining electrochemical measurements and ultrafast optical spectroscopy, we link the water oxidation activity with electron-hole recombination phenomena. The preferential Au decoration at the electrode/water interface produces highly enhanced photocurrent, while when Au is distributed along the whole film thickness, the activity is depressed with respect to pure brookite. In the latter case, Au nanoparticles act as recombination centers with plasmonic carriers recombining on the same time scale of their generation (fs). Conversely, Au surface decoration enables a hot electrons lifetime 4 orders of magnitude longer (ns) due to efficient hopping on brookite lateral facets, thus providing an efficient path for plasmon-enhanced solar water oxidation. (Graph Presented). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|