Correlative nanoscale chemical imaging reveals delocalized Faradaic processes at isolated MXene flakes.

Delocalized proton-coupled electrochemical reactions are observed on isolated Ti3C2Tx MXene flakes, extending beyond the SECCM droplet contact area.

• Why it matters: Macroscale MXene pseudocapacitance is known, but intrinsic nanoscale electrochemical processes on single flakes—and how interfacial water shapes them—remain unclear.
• What they did: Ti3C2Tx flake electronic structure was mapped by scanning X-ray microscopy, then correlated with sub-flake reactions measured by scanning electrochemical cell microscopy, including oxidation and hydrogen evolution.
• The result: Reaction delocalization beyond the droplet contact area is demonstrated for multiple proton-coupled electron transfer reactions, and hydrogen storage evidence is found on monolayer MXene flakes.

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