title: Improvement of the capacitive performances for Co-Al layered double hydroxide by adding hexacyanoferrate into the electrolyte.
abstract: This paper reports on the improvement on the capacitive properties of Co-Al layered double hydroxide (Co-Al LDH) by adding hexacyanoferrate(II) and (III) solely or jointly into 1 M KOH aqueous solution. Owing to the high reversibility, the Fe(CN)(6)(3-)/Fe(CN)(6)(4-) ion pair acts as an electron relay at the electrode/electrolyte interface during charge and discharge by coupling in the redox transition of Co(II)/Co(III) in the Co-Al LDH electrode. Electrochemical impedance spectra and Tafel curves provide direct evidences with decreased charge-transfer resistance and increased exchange current density in the alkaline solution containing hexacyanoferrate ions, respectively.
authors.affiliation: College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 210016, PR China.
authors.forename: Ling-Hao
authors.initials: LH
authors.lastname: Su
authors.forename: Xiao-Gang
authors.initials: XG
authors.lastname: Zhang
authors.forename: Chang-Huan
authors.initials: CH
authors.lastname: Mi
authors.forename: Bo
authors.initials: B
authors.lastname: Gao
authors.forename: Yan
authors.initials: Y
authors.lastname: Liu