Light-Induced Proton Pumping with a Semiconductor: Vision for Photoproton Lateral Separation and Robust Manipulation
authors Maltanava, HM; Poznyak, SK; Andreeva, DV; Queyedo, MC; Bastos, AC; Tedim, J; Ferreira, MGS; Skorb, EV
nationality International
journal ACS APPLIED MATERIALS & INTERFACES
author keywords photocatalysis; TiO2; pH gradient; nanoscale machinery; photoacid; chemical network
keywords IN-SITU FTIR; TIO2; SYSTEMS; LAYER; EQUILIBRIUM; GENERATION; NETWORKS; BEHAVIOR
abstract 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 TiO2 from 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 TiO2 surface 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 TiO2 and 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 TiO2 surface 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 photo electrochemical 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.
publisher AMER CHEMICAL SOC
issn 1944-8244
year published 2017
volume 9
issue 28
beginning page 24282
ending page 24289
digital object identifier (doi) 10.1021/acsami.7b05209
web of science category Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000406172700110
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  impact metrics
journal impact factor (jcr 2016): 7.504
5 year journal impact factor (jcr 2016): 7.823
category normalized journal impact factor percentile (jcr 2016): 89.482
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