title: Humidity effect on nanoscale electrochemistry in solid silver ion conductors and the dual nature of its locality.
abstract: Scanning probe microscopy (SPM) is a powerful tool to investigate electrochemistry in nanoscale volumes. While most SPM-based studies have focused on reactions at the tip-surface junction, charge and mass conservation requires coupled and intrinsically nonlocal cathodic and anodic processes that can be significantly affected by ambient humidity. Here, we explore the role of water in both cathodic and anodic processes, associated charge transport, and topographic volume changes depending on the polarity of tip bias. The first-order reversal curve current-voltage technique combined with simultaneous detection of the sample topography, referred to as FORC-IVz, was applied to a silver solid ion conductor. We found that the protons generated from water affect silver ionic conduction, silver particle formation and dissolution, and mechanical integrity of the material. This work highlights the dual nature (simultaneously local and nonlocal) of electrochemical SPM studies, which should be considered for comprehensive understanding of nanoscale electrochemistry.
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science (IBS) , Seoul 151-747, Korea.
authors.forename: Sang Mo
authors.initials: SM
authors.lastname: Yang
authors.forename: Evgheni
authors.initials: E
authors.lastname: Strelcov
authors.forename: M Parans
authors.initials: MP
authors.lastname: Paranthaman
authors.forename: Alexander
authors.initials: A
authors.lastname: Tselev
authors.forename: Tae Won
authors.initials: TW
authors.lastname: Noh
authors.forename: Sergei V
authors.initials: SV
authors.lastname: Kalinin
mesh_terms: D004563:Electrochemistry; D006813:Humidity; D020527:Microscopy, Scanning Probe; D036103:Nanotechnology; D012834:Silver / Q000737:chemistry*
chemical_list: D012834:Silver
keywords: Humidity; electrochemistry; ionic conduction; locality; scanning probe microscopy; silver