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(60 wt. % water dispersion, Aldrich) in 2propanol. The mixture was ball milled in a planetary ball mill (Retsch PM100) at 300 rpm for 30 min in ambient atmosphere. Obtained slurry was rolled into a thin film on glass and cut into circular discs (ϕ = 10 mm), which were afterwards dried at 50 °C for 1 day to obtain free standing electrodes.