Electrochemical Behavior of Two-Dimensional Atomic Layers

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dc.contributor.advisorLou, Junen_US
dc.creatorZhang, Jingen_US
dc.date.accessioned2017-07-31T17:47:56Zen_US
dc.date.available2017-12-01T06:01:04Zen_US
dc.date.created2016-12en_US
dc.date.issued2016-11-22en_US
dc.date.submittedDecember 2016en_US
dc.date.updated2017-07-31T17:47:56Zen_US
dc.description.abstractIn this thesis several aspects of the electrochemical behaviors of two-dimensional layered materials are discussed. First, large-area continuous few-layer molybdenum disulfide film is prepared by simple solid-gas elemental reaction and transferred onto fluorine doped tin oxide glass substrate as the counter electrode for dye-sensitized solar cells. The catalytic activity of the MoS2 atomic layers are dramatically improved by craving the MoS2 film and creating artificial edges on it. Electrochemical analysis shows that the edges contribute to the improve catalytic activity of MoS2. Second, large-area continuous hexagonal boron nitride film is grown by chemical vapor deposition method. The film is transferred onto copper substrate and tested as the corrosion-inhibiting coating in sodium sulphate aqueous solution. The sample with 30nm h-BN coating shows significantly suppressed copper dissolution peak and only one fourth of the corrosion rate of the uncoated sample. Electrochemical impedance spectroscopy analysis reveals that the charge transfer resistance is much higher when h-BN film is present. Third, we invent a local probe electrochemical measurement method and successfully applied it to the electrolysis catalytic activity measurement of various kinds of transition metal dichalcogenides. The catalytic activity and turnover frequencies of the 2H-MoS2 basal plane versus edge as well as the 1T’-MoS2 basal plane are identified by this measurement. At the same time, the basal plane activity and turnover frequencies of transition metal dichalcogenides from different element groups has been obtained. We have shown that the general trend of the transition metal dichalcogenides in the form of volcano plot follows the trend of metals. VB-VIA dichalcogenides have been identified as the preferential selection for hydrogen evolution reaction catalysts. Last, we discussed the measurement of layered materials in photoelectrolysis using the local probe electrochemical method. Gallium selenide as a good photoconductor, is examined as the photoelectrolysis catalyst and shows promising photoelectrochemical hydrogen evolution performance. The turnover frequency and photon-to-electron conversion efficiency are obtained from our measurements.en_US
dc.embargo.terms2017-12-01en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationZhang, Jing. "Electrochemical Behavior of Two-Dimensional Atomic Layers." (2016) Diss., Rice University. <a href="https://hdl.handle.net/1911/95613">https://hdl.handle.net/1911/95613</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/95613en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subject2D Materialsen_US
dc.subjectElectrochemical Propertiesen_US
dc.subjectHydrogen Evolutionen_US
dc.subjectDye Sensitized Solar Cellsen_US
dc.subjectAnti-corrosionen_US
dc.titleElectrochemical Behavior of Two-Dimensional Atomic Layersen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentMaterials Science and NanoEngineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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