Accession Number : AD0664827

Title :   THE PLATE MATERIALS OF THE LEAD-ACID CELL. PART 3-ANODIC OXIDATION OF TETRAGONAL PBO.

Descriptive Note : Final rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Burbank,Jeanne

Report Date : 29 DEC 1967

Pagination or Media Count : 24

Abstract : Tetragonal PbO (designated PbO-L) was anodized in H2SO4 solution at room temperature, and became converted to a dark-brown-to-metallic-black material resembling PbO2. X-ray diffraction examination of the anodic product showed that it was neither of the known polymorphs of PbO2 but had retained the diffraction pattern of the original tetragonal PbO. The oxidized material had many of the chemical properties of PbO2, an ohmic resistivity of 0.82 ohm-cm, and an open circuit potential in 1.225 sp gr H2SO4, 52 mv above that of beta-PbO2 in the same acid. Chemical analysis showed a stoichiometry of PbO1.91. Crystal morphologies were examined in the electron microscope. Studies on the mechanism of PbO-L oxidation indicate that oxygen may enter the PbO-L lattice as atoms, take two electrons from the Pb present in the lattice and then diffuse through the lattice as ions. Two possibilities for the logical placements of the additional oxygen in the lattice are the fluorite-related LaOF and the PbFC1 layer structure types, both with the same space group as PbO-L, P4/nmm. It is not possible at this time to determine which if either of these possibilities is the actual structure. (Author)

Descriptors :   (*STORAGE BATTERIES, ELECTRODES), (*ELECTRODES, OXIDATION), ANODIC COATINGS, LEAD COMPOUNDS, OXIDES, CRYSTAL STRUCTURE, X RAY DIFFRACTION, CHEMICAL PROPERTIES, ELECTRICAL PROPERTIES, CRYSTAL LATTICES, CHEMICAL REACTIONS, ELECTROCHEMISTRY, LEAD(METAL), SULFURIC ACID

Subject Categories : Physical Chemistry
      Electrochemical Energy Storage

Distribution Statement : APPROVED FOR PUBLIC RELEASE