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Li+/H+ Ion-exchanged Li2MO3 (M = Ir, Pt) and Carbonate Melt Oxidized IrOx pH Sensors

O'Malley, Matthew J.

Abstract Details

2008, Master of Science, Ohio State University, Materials Science and Engineering.
Analyses and characterizations of Li+/H+ ion-exchanged Li2MO3 (M = Ir, Pt) and carbonate melt oxidized IrOx pH sensors are presented and discussed. The resulting structures produced during Li+/H+ ion-exchange for Li2IrO3 and Li2PtO3 powders as well as carbonate melt oxidized Ir and Pt wires (0.25 mm dia.) are characterized and tested using XRD, SEM, TEM, and TGA. The protonation results in the formation of HIr2/3+xLi1/3-xO2, of the HCrO2 structure type. The LiM2 layers shift due to hydrogen bonding between successive layers, which is absent in the Li2MO3 parent structures. HIr2/3+xLi1/3-xO2 is observed in both the powder and the melt oxidized wire, with preferred orientation observed in the needle-like surface under particular melt oxidation conditions. The pH responses of the iridium oxide and platinum oxide electrodes produced using a new synthetic method are presented. The stability and reproducibility of the electrodes are good, with minimal inference from Li+ and K+.
Henk Verweij, PhD (Advisor)
Patricia Morris, PhD (Committee Member)
99 p.

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Citations

  • O'Malley, M. J. (2008). Li+/H+ Ion-exchanged Li2MO3 (M = Ir, Pt) and Carbonate Melt Oxidized IrOx pH Sensors [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1221839212

    APA Style (7th edition)

  • O'Malley, Matthew. Li+/H+ Ion-exchanged Li2MO3 (M = Ir, Pt) and Carbonate Melt Oxidized IrOx pH Sensors. 2008. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1221839212.

    MLA Style (8th edition)

  • O'Malley, Matthew. "Li+/H+ Ion-exchanged Li2MO3 (M = Ir, Pt) and Carbonate Melt Oxidized IrOx pH Sensors." Master's thesis, Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1221839212

    Chicago Manual of Style (17th edition)