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Probing proton transport is of vital importance for understanding cellular transport, surface catalysis and fuel cells. Conventional proton transport measurements rely on the use of electrochemical conductivity and do not allow for the direct visualization of proton transport pathways. The development of novel experimental techniques to spatiotemporally resolve proton transport is in high demand. Here, building upon the general conversion of aqueous proton flux into spatially resolved fluorescence signals, we optically visualize proton transport through nanopores and along hydrophilic interfaces. We observed that the fluorescence intensity increased at negative voltage due to lateral transport. Thanks to the temporal resolution of optical imaging, our technique further empowers the analysis of proton transport dynamics. © 2021 Wiley-VCH GmbH.

Citation

Jinmei Yang, Yuxian Lu, Lei Jin, Chunxiao Zhao, Yuang Chen, Yang Xu, Fanfan Chen, Jiandong Feng. Dynamic Optical Visualization of Proton Transport Pathways at Water-Solid Interfaces. Angewandte Chemie (International ed. in English). 2022 Jan 10;61(2):e202112150

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PMID: 34751999

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