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Surface science studies of electrochemical energy storage devices

Wang, Kuilong
http://rave.ohiolink.edu/etdc/view?acc_num=case1056555985

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1992, Doctor of Philosophy, Case Western Reserve University, Physics.
Using ultra-high-vacuum (UHV) surface and electrochemical techniques, three interfacial systems have been studied, including KOH/Ni(111), CO2/K/Ag(111) and THF/Li interfaces. All three studies were associated with electrochemical energy storage devices. Desorption of CO2 on K-dosed Ag(111) was investigated using temperature desorption (TPD), Auger electron (AES), x-ray photoelectron (XPS), work function measurements, and high resolution electron energy loss (HREELS) spectroscopies. Unlike the behavior observed for other K-modified metal surfaces (e.g. Pd), the TPD spectra on CO2-saturated K/Ag(111) exhibited a sharply defined m/e = 44 peak at 796 K with no evidence for desorption of CO at any temperature. An oligomeric CO2 chain model was proposed to explain the desorption feature. Adventitious water and oxygen in the system and/or defect sites in the Ag(111) crystal gave rise to an additional m/e = 44 peak at much higher temperature, which was attributed to the formation of ordinary carbonate. Electrochemical properties of Ni(111) prepared and characterized in UHV were examined in 0.1 M KOH by cyclic voltammetry using an UHV-electrochemistry transfer system. A saturation coverage (0.5) of CO was used to protect the Ni(111) from possible contamination during the transfer. The results indicated that the CO layer remained intact up to the moment of contact with the electrolyte and could be further electro-oxidized. Only one monolayer of Ni metal was involved in the electrochemically formed film in the first voltammetric cycle and less than two monolayers upon repeated cycling. Surfaces which were not protected by CO displayed essentially the same behavior. The reaction of THF (tetrahydrofuran) with Li was studied. THF adsorbed on deposited Li films with partial dissociation, yielding less than a monolayer mixture of THF and dissociated products on the surface. It was observed that Li diffused into Ag above room temperature. The electron beam in AES and x-rays in XPS caused severe damage to THF.
Gary Chottiner (Advisor)
203 p.
Surface science studies electrochemical energy storage devices

Recommended Citations

Citations

  • Wang, K. (1992). Surface science studies of electrochemical energy storage devices [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1056555985

    APA Style (7th edition)

  • Wang, Kuilong. Surface science studies of electrochemical energy storage devices. 1992. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1056555985.

    MLA Style (8th edition)

  • Wang, Kuilong. "Surface science studies of electrochemical energy storage devices." Doctoral dissertation, Case Western Reserve University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=case1056555985

    Chicago Manual of Style (17th edition)

case1056555985
724
© 1992, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.