Voltammetric Mapping of Hydrogen Evolution Reaction on Pt Locally via Scanning Electrochemical Cell Microscopy
Yufei Wang, Mingyang Li, Hang Ren
Abstract
correction can be readily applied to the voltammetry, resulting in more accurate measurements of the electrode kinetics. This scanning mode is demonstrated in the oxidation of a ferrocene derivative on HOPG and hydrogen evolution reaction (HER) on polycrystalline Pt, serving as model systems for outer-sphere and inner-sphere electron transfer reactions, respectively. While the kinetics of the inner-sphere reaction is consistent spatially, heterogeneity is observed for the kinetics of HER, which is correlated with the crystal orientation of Pt.
Topics & Concepts
Scanning electrochemical microscopyCyclic voltammetryScanning electron microscopeElectrocatalystElectrochemistryUltramicroelectrodeVoltammetryElectrodeAnalytical Chemistry (journal)Scanning probe microscopyMaterials scienceKineticsChemistryNanotechnologyPhysical chemistryPhysicsQuantum mechanicsComposite materialChromatographyElectrochemical Analysis and ApplicationsElectrocatalysts for Energy ConversionConducting polymers and applications