Nanoscale redox mapping at the MoS2-liquid interface
Open Access
- 26 February 2021
- journal article
- research article
- Published by Springer Science and Business Media LLC in Nature Communications
- Vol. 12 (1), 1-10
- https://doi.org/10.1038/s41467-021-21660-z
Abstract
Layered MoS2 is considered as one of the most promising two-dimensional photocatalytic materials for hydrogen evolution and water splitting; however, the electronic structure at the MoS2-liquid interface is so far insufficiently resolved. Measuring and understanding the band offset at the surfaces of MoS2 are crucial for understanding catalytic reactions and to achieve further improvements in performance. Herein, the heterogeneous charge transfer behavior of MoS2 flakes of various layer numbers and sizes is addressed with high spatial resolution in organic solutions using the ferrocene/ferrocenium (Fc/Fc+) redox pair as a probe in near-field scanning electrochemical microscopy, i.e. in close nm probe-sample proximity. Redox mapping reveals an area and layer dependent reactivity for MoS2 with a detailed insight into the local processes as band offset and confinement of the faradaic current obtained. In combination with additional characterization methods, we deduce a band alignment occurring at the liquid-solid interface.This publication has 54 references indexed in Scilit:
- Band Bending in Semiconductors: Chemical and Physical Consequences at Surfaces and InterfacesChemical Reviews, 2012
- Simple and Clear Evidence for Positive Feedback Limitation by Bipolar Behavior during Scanning Electrochemical Microscopy of Unbiased ConductorsAnalytical Chemistry, 2011
- Kelvin probe force microscopy and its applicationSurface Science Reports, 2011
- Advanced Carbon Electrode Materials for Molecular ElectrochemistryChemical Reviews, 2008
- Probing Heterogeneous Electron Transfer at an Unbiased Conductor by Scanning Electrochemical Microscopy in the Feedback ModeAnalytical Chemistry, 2007
- Effect of the mediator in feedback mode-based SECM interrogation of indium tin-oxide and boron-doped diamond electrodesJournal of Solid State Electrochemistry, 2006
- Electric Field Effect in Atomically Thin Carbon FilmsScience, 2004
- Scanning Electrochemical Microscopy. 25. Application to Investigation of the Kinetics of Heterogeneous Electron Transfer at Semiconductor (WSe2 and Si) ElectrodesThe Journal of Physical Chemistry, 1994
- Scanning Electrochemical Microscopy: VII . Effect of Heterogeneous Electron‐Transfer Rate at the Substrate on the Tip Feedback CurrentJournal of the Electrochemical Society, 1991
- Scanning electrochemical microscopy. Theory of the feedback modeAnalytical Chemistry, 1989