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Article Abstract
Layered MoS is considered as one of the most promising two-dimensional photocatalytic materials for hydrogen evolution and water splitting; however, the electronic structure at the MoS-liquid interface is so far insufficiently resolved. Measuring and understanding the band offset at the surfaces of MoS are crucial for understanding catalytic reactions and to achieve further improvements in performance. Herein, the heterogeneous charge transfer behavior of MoS 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 MoS 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.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7910562 | PMC |
| http://dx.doi.org/10.1038/s41467-021-21660-z | DOI Listing |
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