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Herein, the electrochemical synthesis of WO3 nanoplatelet powder is demonstrated in a novel electrolyte composed of ethylene glycol (EG), H2O and 1-ethyl-3-methylimidazolium tetrafluoroborate (EmimBF4). On applying an anodization potential of 40 V to the electrolyte at room temperature, the W substrate is efficiently transformed into a dispersed WO3·2H2O nanoplatelet powder, not a thin WO3 film on the W substrate as usually occurs. The interaction between EG and water in the electrolyte during breakdown anodization is discussed, and a mechanism for the formation of WO3·2H2O nanoplatelets is proposed. Keywords: Breakdown anodization, WO3 nanoplates, Nanopowder, Potentiostatic, Electrochemical oxidation