{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Brunet Cabre M"],"funding":["EC | EU Framework Programme for Research and Innovation H2020 | H2020 Priority Excellent Science | H2020 Marie Skłodowska-Curie Actions (H2020 Excellent Science - Marie Skłodowska-Curie Actions)","European Research Council","Science Foundation Ireland (SFI)"],"pagination":["374"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC9870982"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["14(1)"],"pubmed_abstract":["Pseudocapacitive charge storage in Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXenes in acid electrolytes is typically described as involving proton intercalation/deintercalation accompanied by redox switching of the Ti centres and protonation/deprotonation of oxygen functional groups. Here we conduct nanoscale electrochemical measurements in a unique experimental configuration, restricting the electrochemical contact area to a small subregion (0.3 µm<sup>2</sup>) of a monolayer Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> flake. In this unique configuration, proton intercalation into interlayer spaces is not possible, and surface processes are isolated from the bulk processes, characteristic of macroscale electrodes. Analysis of the pseudocapacitive response of differently sized MXene flakes indicates that entire MXene flakes are charged through electrochemical contact of only a small basal plane subregion, corresponding to as little as 3% of the flake surface area. Our observation of pseudocapacitive charging outside the electrochemical contact area is suggestive of a fast transport of protons mechanism across the MXene surface."],"journal":["Nature communications"],"pubmed_title":["Isolation of pseudocapacitive surface processes at monolayer MXene flakes reveals delocalized charging mechanism."],"pmcid":["PMC9870982"],"funding_grant_id":["HECAT4H2","19/FFP/6761","GA 681544"],"pubmed_authors":["Nicolosi V","Spurling D","Brunet Cabre M","Longhi M","Colavita PE","McKelvey K","Schroder C","Martinuz P","Nolan H"],"additional_accession":[]},"is_claimable":false,"name":"Isolation of pseudocapacitive surface processes at monolayer MXene flakes reveals delocalized charging mechanism.","description":"Pseudocapacitive charge storage in Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXenes in acid electrolytes is typically described as involving proton intercalation/deintercalation accompanied by redox switching of the Ti centres and protonation/deprotonation of oxygen functional groups. Here we conduct nanoscale electrochemical measurements in a unique experimental configuration, restricting the electrochemical contact area to a small subregion (0.3 µm<sup>2</sup>) of a monolayer Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> flake. In this unique configuration, proton intercalation into interlayer spaces is not possible, and surface processes are isolated from the bulk processes, characteristic of macroscale electrodes. Analysis of the pseudocapacitive response of differently sized MXene flakes indicates that entire MXene flakes are charged through electrochemical contact of only a small basal plane subregion, corresponding to as little as 3% of the flake surface area. Our observation of pseudocapacitive charging outside the electrochemical contact area is suggestive of a fast transport of protons mechanism across the MXene surface.","dates":{"release":"2023-01-01T00:00:00Z","publication":"2023 Jan","modification":"2025-04-04T18:53:32.249Z","creation":"2025-04-04T18:53:32.249Z"},"accession":"S-EPMC9870982","cross_references":{"pubmed":["36690615"],"doi":["10.1038/s41467-023-35950-1"]}}