Nanoscale redox mapping at the MoS2-liquid interface

He-Yun Du, Yi-Fan Huang, Deniz Wong, Mao-Feng Tseng, Yi-Hsin Lee, Chen-Hao Wang, Cheng-Lan Lin, Germar Hoffmann (), Kuei-Hsien Chen () and Li-Chyong Chen ()
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He-Yun Du: National Taiwan University
Yi-Fan Huang: Institute of Atomic and Molecular Sciences, Academia Sinica
Deniz Wong: Institute of Atomic and Molecular Sciences, Academia Sinica
Mao-Feng Tseng: Institute of Atomic and Molecular Sciences, Academia Sinica
Yi-Hsin Lee: National Taiwan University
Chen-Hao Wang: National Taiwan University of Science and Technology
Cheng-Lan Lin: Tamkang University
Germar Hoffmann: National Tsing Hua University
Kuei-Hsien Chen: National Taiwan University
Li-Chyong Chen: National Taiwan University

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-21660-z

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