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Related Concept Videos

Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current passing...
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Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...

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Substrate-modulated interfacial proton adsorption on graphene.

Zhida Gao1, Yuyang Long1, Jidong Li2

  • 1State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China; College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China.

Journal of Colloid and Interface Science
|September 10, 2025
PubMed
Summary
This summary is machine-generated.

The supporting substrate significantly impacts proton adsorption on two-dimensional (2D) materials like graphene. Substrate-induced charge fluctuations, not the material itself, control ion adsorption at the graphene-liquid interface.

Keywords:
Aqueous environmentsElectrical transport measurementsGrapheneProton adsorptionSubstrate contribution

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Area of Science:

  • Surface Science
  • Materials Science
  • Electrochemistry

Background:

  • Ion adsorption at solid-liquid interfaces is crucial for 2D materials.
  • Supporting substrates influence 2D material properties in applications.
  • Understanding substrate effects is key for interfacial science and device performance.

Purpose of the Study:

  • Investigate how supporting substrates modulate ion adsorption on 2D materials.
  • Determine the role of substrate-induced effects on interfacial charge transfer.
  • Provide insights into designing 2D material systems for aqueous environments.

Main Methods:

  • Utilized monolayer graphene as a model system.
  • Employed electrical transport and Raman spectroscopy to quantify proton adsorption.
  • Applied Kelvin probe force microscopy to probe substrate-induced charge fluctuations.

Main Results:

  • Demonstrated significantly higher proton adsorption on SiO2-supported graphene compared to hBN-supported graphene.
  • Identified higher electron-hole fluctuations on SiO2 as the cause for increased adsorption.
  • Established substrate-mediated charge inhomogeneity as a key factor in ion adsorption.

Conclusions:

  • The supporting substrate critically influences ion adsorption at the 2D material-liquid interface.
  • Substrate-induced charge inhomogeneity governs interfacial ion adsorption.
  • This work offers a strategy for optimizing graphene-based systems for aqueous applications.