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, [Co Ni W O (OH) (H O) ], on a commercial nickel foam electrode. The electrode shows efficient and sustained electrochemical oxygen evolution at low overpotentials (360 mV at 10 mA cm against RHE, Tafel slope 126 mV dec , 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.

The development of advanced anode materials is of significance for the next generation of lithium-ion batteries (LIBs). Herein, imidazolium-based ionic liquids (ILs) are grafted covalently on the surface of graphene oxides (GO) through the carboxyl-amino bond, providing a loading hotbed for the Dawson-type polyoxometalate (POM) of (NH ) P Mo O (denoted as P Mo ). The as-prepared GO-IL-P Mo nanocomposite is characterized by FTIR and Raman spectroscopy, TGA, SEM, TEM, and XPS. The nanocomposite is used as the anode material for LIBs, and shows a high reversible capacity of 903.9 mAh g with a long cycle life over 1000 cycles. Galvanostatic cycling tests, CV measurements, and AC impedance spectra reveal that the POMs in the GO-IL-P Mo nanocomposite give an enhanced specific capacity during the Lithium insertion/extraction process, and the IL provides a favored contact between the electrolyte and the electrode.

Die Entwicklung von technisch relevanten Elektroden fürdie elektrochemischeSauerstoffentwicklung (OER) ist eine der grçßten Herausforderungen der chemischen Energiewandlung.Nun gelang die hydrothermale Immobilisierung des Dexter-Silverton-Polyoxometallats,[ Co 6.8 Ni 1.2 W 12 O 42 -(OH) 4 (H 2 O) 8 ], auf einer kommerziellen Nickelschaumelektrode.