title: Co-Ni layered double hydroxides for water oxidation in neutral electrolyte.
abstract: The electrochemical properties of Co-Ni layered double hydroxides (LDHs) as efficient electrocatalysts for water oxidation were investigated in potassium phosphate electrolyte under neutral pH condition. The Co-Ni LDHs with a core-shell structure were fabricated using a facile route from a Co-Ni hydroxide precursor with iodine as a topotactic oxidizer. The unique core-shell morphology is likely due to the enrichment of Co(III) hydroxide in the inner core indicated by selected area electron diffraction and energy-dispersive spectroscopy. Through a self-assembling process at the organic/inorganic interface and dip-coating, the Co-Ni LDHs were deposited onto FTO glass substrates to prepare composite electrodes. Low over-potential and high current density was achieved in the oxygen evolution reaction. The excellent electrocatalytic activity of Co-Ni LDHs may be attributed to more accessible Co active sites and rapid movement of interlayer ions within their layered structure.
authors.affiliation: State Key Laboratory of New Ceramics & Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, P R China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Zhang
authors.forename: Bai
authors.initials: B
authors.lastname: Cui
authors.forename: Chunsong
authors.initials: C
authors.lastname: Zhao
authors.forename: Hong
authors.initials: H
authors.lastname: Lin
authors.forename: Jianbao
authors.initials: J
authors.lastname: Li