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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Charge Storage in Graphene Oxide: Impact of the Cation on Ion Permeability and Interfacial Capacitance

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Author(s):
Paschoalino, Waldemir J. [1, 2] ; Payne, Nicholas A. [2] ; Pessanha, Tatiana M. [1] ; Gateman, Samantha M. [2] ; Kubota, Lauro T. [1] ; Mauzeroll, Janine [2]
Total Authors: 6
Affiliation:
[1] Univ Estadual Campinas, Inst Chem, Dept Analyt Chem, BR-13084971 Campinas, SP - Brazil
[2] McGill Univ, Dept Chem, Montreal, PQ H3A 0B8 - Canada
Total Affiliations: 2
Document type: Journal article
Source: Analytical Chemistry; v. 92, n. 15, p. 10300-10307, AUG 4 2020.
Web of Science Citations: 0
Abstract

The charge storage and membrane applications of graphene oxide (GO) materials are dictated by its intrinsic material properties. Structure-function relationships correlating periodic parameters, such as the hydrated ion radius and ion-GO interactions, are currently lacking yet are needed to provide insight on the charge storage and ion transport mechanism. We report the use of scanning ion conductance microscopy to measure the ion permeability of GO films and evaluate its relationship with the measured capacitance. We demonstrate that species (namely K+) with strong electrostatic interactions with the oxygen functionalities of GO provide the benefit of higher capacitance but suffer from inhibited ion mobility due to constriction of the GO interlayer spacing (AU)

FAPESP's process: 14/50867-3 - INCT 2014: National Institute of Science and Technology in Bioanalysis
Grantee:Lauro Tatsuo Kubota
Support type: Research Projects - Thematic Grants
FAPESP's process: 18/12910-5 - Investigation of the electrocatalytic activity of sensors based on graphene oxide decorated with PT, AU or Ag nanoparticles by scanning electrochemical microscopy
Grantee:Waldemir José Paschoalino Junior
Support type: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 17/05213-3 - Investigation of the electrocatalytic activity of sensors based on graphene oxide decorated with Pt, Au or Ag nanoparticles by scanning electrochemical microscopy.
Grantee:Waldemir José Paschoalino Junior
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/22127-2 - Development of novel materials strategic for integrated analytical devices
Grantee:Lauro Tatsuo Kubota
Support type: Research Projects - Thematic Grants