Four organic-inorganic hybrid ionic liquid polyoxometalate (IL-POM) nanomaterials which combined excellent electrochemical properties of ILs and POMs have been fabricated by a facile synthesis method of solid-state chemical reaction at room temperature with the reactants of four ILs and Keggin-type structure phosphomolybdic acid. The electrochemical studies reveal that the as-prepared IL-POM modified carbon paste electrodes (IL-POM CPEs) show enhanced electrochemical responses than those of quaternary ammonium polyoxometalates, which may be due to the conductivities of the organic cations for ILs. Furthermore, IL-POM CPEs exhibit good catalytic activities and sensitive responses to the reduction of nitrite, bromate and hydrogen peroxide. Owing to its outstanding performance, the organic-inorganic hybrid IL-POM CPEs would take on promising prospects of the practical applications in electrochemical sensors. (C) 2012 Elsevier Ltd. All rights reserved.