The as-prepared corncob-shaped ZnFe2O4/C composite materials serve as anodes in lithium ion batteries and display high rate capability and enhanced recycling durability in comparison with pure ZnFe2O4 materials.
Electrodeposition of PbO 2 films from methanesulfonate (MSA) baths onto Ti/SnO 2 -Sb substrates are studied in this paper. With increasing the concentration of MSA, the growth of α-phase PbO 2 is preferred. Adsorption of MS ions on surface enhances the preferential orientations of α (0 2 0) and β (3 0 1) planes, and favors the formation of dense and uniform PbO 2 film with deposition time. The presence of Bi 3+ ions in the baths facilitates the growth of β-phase PbO 2 instead of α phase, and at the same time, inhibits the formation of nonstoichiometric PbO 2 by replacing the Pb (II) in the lattice defects. The improvement in both morphology and service lifetime is achieved by the low-level Bi inclusion. In contrast, the high-level Bi inclusion results in a shorten service lifetime and higher oxygen evolution current density.
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