title: An Iron-based Film for Highly Efficient Electrocatalytic Oxygen Evolution from Neutral Aqueous Solution.
abstract: An ultrathin Fe-based film was prepared by electrodeposition from an Fe(II) solution through a fast and simple cyclic voltammetry method. The extremely low Fe loading of 12.3 nmol cm(-2) on indium tin oxide electrodes is crucial for high atom efficiency and transparence of the resulted film. This Fe-based film was shown to be a very efficient electrocatalyst for oxygen evolution from neutral aqueous solution with remarkable activity and stability. In a 34 h controlled potential electrolysis at 1.45 V (vs NHE) and pH 7.0, impressive turnover number of 5.2 × 10(4) and turnover frequency of 1528 h(-1) were obtained. To the best of our knowledge, these values represent one of the highest among electrodeposited catalyst films for water oxidation under comparable conditions. The morphology and the composition of the catalyst film was determined by scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray, and X-ray photoelectron spectroscopy, which all confirmed the deposition of Fe-based materials with Fe(III) oxidation state on the electrode. This study is significant because of the use of iron, the fast and simple cyclic voltammetry electrodeposition, the extremely low catalyst loading and thus the transparency of the catalyst film, the remarkable activity and stability, and the oxygen evolution in neutral aqueous media.
authors.affiliation: Department of Chemistry, Renmin University of China , Beijing 100872, China.
authors.forename: Mingxing
authors.initials: M
authors.lastname: Chen
authors.affiliation: Department of Chemistry, Renmin University of China , Beijing 100872, China.
authors.forename: Yizhen
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Department of Chemistry, Renmin University of China , Beijing 100872, China.
authors.forename: Yongzhen
authors.initials: Y
authors.lastname: Han
authors.affiliation: College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China.
authors.forename: Xiaohuan
authors.initials: X
authors.lastname: Lin
authors.affiliation: College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China.
authors.forename: Junliang
authors.initials: J
authors.lastname: Sun
authors.affiliation: School of Chemistry and Chemical Engineering, Shaanxi Normal University , Xi'an 710119, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Renmin University of China , Beijing 100872, China.|School of Chemistry and Chemical Engineering, Shaanxi Normal University , Xi'an 710119, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Cao
keywords: electrocatalysis; film preparation; iron; oxygen evolution; water splitting