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説明:

Transport of single ionic charges at solid/liquid interfaces is vital to energy conversion, electrochemistry and biological activities. It is mostly studied in ensemble indirect ways, which temporally and spatially average individual molecular dynamics. The dynamical interaction between single molecules and the interface is missing. In this study, we use an single-molecule optonanofluidic plateform relying on fluorescent hBN defects to directly visualize the interfacial transport of single protons and ultimately reveal the vital role played by surface defects. We firstly statistically report different types of adsorption sites, created by plasma bombardment, that are responsible for the proton adsorption. We further reveal that the proton dynamics features exponentially-decaying arms, strongly departing from the classically uncorrelated ergodic Gaussian for Brownian transport. By using plasma treatments to control the trapping site density, we evidence the significant modulation of single ion dynamics. Brownian dynamics simulations evidence that the exponential process originates from the molecular adsorption on defect sites, and they give a semi-empirical scaling be- tween the effective diffusion coefficient and adsorption events. Our study highlights the key yet overlooked role of defects in the interfacial charge transport, with potential applications in the design of super-capacitor, batteries and blue energy conversion.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: ionic friction
, hBN/water interface, surface defects


刊行年月日: 2025-09-01

出版者: Springer Science and Business Media LLC

掲載誌:

• Communications Materials (ISSN: 26624443) vol. 6 issue. 1 200

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s43246-025-00910-3

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更新時刻: 2026-02-17 08:30:08 +0900

MDRでの公開時刻: 2026-02-16 18:00:48 +0900