title: Robust Polyoxometalate/Nickel Foam Composite Electrodes for Sustained Electrochemical Oxygen Evolution at High pH.
abstract: The development of technologically viable electrodes for the electrochemical oxygen evolution reaction (OER) is a major bottleneck in chemical energy conversion. This article describes a facile one-step hydrothermal route to deposit microcrystals of a robust Dexter-Silverton polyoxometalate oxygen evolution catalyst, [Co6.8Ni1.2W12O42(OH)4(H2O)8], on a commercial nickel foam electrode. The electrode shows efficient and sustained electrochemical oxygen evolution at low overpotentials (360 mV at 10 mA cm-2against RHE, Tafel slope 126 mV dec-1, faradaic efficiency (96±5) %) in alkaline aqueous solution (pH 13). Post-catalytic analyses show no mechanical or chemical degradation and no physical detachment of the microcrystals. The results provide a blueprint for the stable "wiring" of POM catalysts to commercial metal foam substrates, thus giving access to technologically relevant composite OER electrodes.
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 100029, Beijing, P.R. China.
authors.forename: Wenjing
authors.initials: W
authors.lastname: Luo
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 100029, Beijing, P.R. China.
authors.forename: Jun
authors.initials: J
authors.lastname: Hu
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 100029, Beijing, P.R. China.
authors.forename: Hongling
authors.initials: H
authors.lastname: Diao
authors.affiliation: Institute of Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Schwarz
authors.affiliation: Institute of Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany.
authors.forename: Carsten
authors.identifier: 0000-0002-5846-1905
authors.initials: C
authors.lastname: Streb
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 100029, Beijing, P.R. China.
authors.forename: Yu-Fei
authors.initials: YF
authors.lastname: Song
keywords: electrocatalysis; metal oxides; oxygen evolution reaction; polyoxometalates; self-assembly