External-field-driven molecular polarization manipulates reactant interface toward efficient hydrogen evolution

doi:10.1007/s40843-023-2480-x

External-field-driven molecular polarization manipulates reactant interface toward efficient hydrogen evolution

2023-07-18

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DOI：10.1007/s40843-023-2480-x

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The reaction interface which governs the electrocatalytic behavior is notoriously hard to understand due to inadequate regulatory and detection methods. By using on-chip microdevices, we employ variable back-gate voltages to generate molecular polarization and thus fine-tune the concentration of hydronium ions (H3O+) in electrochemical double layers for efficient hydrogen evolution. Taking C-60/ MoS2 heterojunction as a prototype, electrical tests reveal that the back-gate promotes the charge transfer from C-60 to MoS2, leading to the polarization of C-60. In situ photoluminescence spectra verify that the polarized C-60 can attract H3O+ to accumulate in the vicinity of MoS2 in the external electric field. Profiting from the back-gated H3O+ enrichment, the hydrogen evolution current is increased by five times at -0.45 V-RHE when a 1.5-V back-gate voltage is applied. The insight into the reaction interface from manipulation to detection can facilitate diverse catalytic reactions.

Keywords:

hydrogen evolution

external electric field

vdW heterojunction

on-chip electrocatalysis

ion accumulation

External-field-driven molecular polarization manipulates reactant interface toward efficient hydrogen evolution

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