ORCID Profile
0000-0002-6506-0392
Current Organisation
Curtin University
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Publisher: Elsevier BV
Date: 10-2022
Publisher: Elsevier BV
Date: 11-2022
Publisher: American Chemical Society (ACS)
Date: 06-01-2022
DOI: 10.1021/ACS.LANGMUIR.1C02723
Abstract: Over the last three decades, research on redox-active monolayers has consolidated their importance as advanced functional material. For widespread monolayer systems, such as alkanethiols on gold, non-ideal multiple peaks in cyclic voltammetry are generally taken as indication of heterogeneous intermolecular interactions─namely, disorder in the monolayer. Our findings show that, contrary to metals, peak multiplicity of silicon photoelectrodes is not diagnostic of heterogeneous intermolecular microenvironments but is more likely caused by photocurrent being heterogeneous across the monolayer. This work is an important step toward understanding the cause of electrochemical non-idealities in semiconductor electrodes so that these can be prevented and the redox behavior of molecular monolayers, as photocatalytic systems, can be optimized.
Publisher: American Chemical Society (ACS)
Date: 12-08-2021
Publisher: American Chemical Society (ACS)
Date: 16-10-2021
DOI: 10.1021/JACS.1C06385
Abstract: Herein we demonstrate that ionic liquids can form long-lived double layers, generating electric fields detectable by straightforward open circuit potential (OCP) measurements. In imidazolium-based ionic liquids an external negative voltage pulse leads to an exceedingly stable near-surface dipolar layer, whose field manifests as long-lived (∼1-100 h) discrete plateaus in OCP versus time traces. These plateaus occur within an ionic liquid-specific and sharp potential window, defining a simple experimental method to probe the onset of interfacial ordering phenomena, such as overscreening and crowding. Molecular dynamics modeling reveals that the OCP arises from the alignment of the in idual ion dipoles to the external electric field pulse, with the magnitude of the resulting OCP correlating with the product of the projected dipole moment of the cation and the ratio between the cation diffusion coefficient and its volume. Our findings also reveal that a stable overscreened structure is more likely to form if the interface is first forced through crowding, possibly accounting for the scattered literature data on relaxation kinetics of near-surface structures in ionic liquids.
Publisher: American Chemical Society (ACS)
Date: 28-09-2022
Publisher: American Chemical Society (ACS)
Date: 29-12-2021
DOI: 10.1021/JACS.0C10713
Publisher: American Chemical Society (ACS)
Date: 12-12-2021
No related grants have been discovered for Xin Lyu.