Abstract
We tune the optical and electronic properties of 2D transition metal dichalcogenides (TMDCs) – MoS2, MoSe2, WS2, and WSe2– to control the surface conductivity, energetics, and ultimately reactivity. The optoelectronic properties of monolayer and few-layered TMDCs are tuned by surface functionalization, environmental control, and phase engineering. These modifications have a direct impact on the surface reactivity for hydrogen generation. Specifically, we directly map the surface energetics, phase, and reactivity with scanning electrochemical microscopy, scanning Kelvin probe microscopy, confocal Raman/photoluminescence, and scanning transmission electron microscopy-electron energy loss spectroscopy. Moreover, we disentangle the influence of O2and H2O molecules on the surface of TMDCs, where these molecules impact the optoelectronic properties and can influence the potential applications of monolayer TMDCs in (photo)electrocatalysis.
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