Electrochemical ozone generation with ozone current efficiencies up to 33% and power consumption as low as 25 kWh kg(-1) O-3 at room temperature using Ni/Sb-SnO2 anodes in a membrane electrode assembly (MEA) based cell with platinised titanium cathodes separated by Nafion membrane is reported. The complete decolourisation of 200 cm(3) of 1000 mg dm(-3) Reactive Blue 50 (RB50) dye within 8 minutes at 2.7V with 100% current efficiency for the first 5 minutes and specific power consumption as low as ca. 8 kWh kg(COD)(-1) using the MEA-based cell is also described. The byproducts of the dye oxidation were investigated and the formation of various organic acids confirmed. (C) 2014 Elsevier Ltd. All rights reserved.