| Autor: |
Maltanava, Hanna M., Poznyak, Sergey K., Andreeva, Daria V., Quevedo, Marcela C., Bastos, Alexandre C., Tedim, João, Ferreira, Mário G. S., Skorb, Ekaterina V. |
| Zdroj: |
ACS Applied Materials & Interfaces; July 2017, Vol. 9 Issue: 28 p24282-24289, 8p |
| Abstrakt: |
Energy-transfer reactions are the key for living open systems, biological chemical networking, and the development of life-inspired nanoscale machineries. It is a challenge to find simple reliable synthetic chemical networks providing a localization of the time-dependent flux of matter. In this paper, we look to photocatalytic reaction on TiO2from different angles, focusing on proton generation and introducing a reliable, minimal-reagent-consuming, stable inorganic light-promoted proton pump. Localized illumination was applied to a TiO2surface in solution for reversible spatially controlled “inorganic photoproton” isometric cycling, the lateral separation of water-splitting reactions. The proton flux is pumped during the irradiation of the surface of TiO2and dynamically maintained at the irradiated surface area in the absence of any membrane or predetermined material structure. Moreover, we spatially predetermine a transient acidic pH value on the TiO2surface in the irradiated area with the feedback-driven generation of a base as deactivator. Importantly we describe how to effectively monitor the spatial localization of the process by the in situ scanning ion-selective electrode technique (SIET) measurements for pH and the scanning vibrating electrode technique (SVET) for local photoelectrochemical studies without additional pH-sensitive dye markers. This work shows the great potential for time- and space-resolved water-splitting reactions for following the investigation of pH-stimulated processes in open systems with their flexible localization on a surface. |
| Databáze: |
Supplemental Index |
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