Direct borohydride/peroxide fuel cells using Prussian Blue cathodes

► Direct borohydride fuel cell with Pt anode and Prussian Blue (PB)-coated Pt cathode. ► Influence of temperature and fuel (NaBH4 + NaOH) and oxidant (H2O2 + HCl) compositions. ► Best conditions at 55 °C, with 1.0 M NaBH4 + 4.0 M NaOH and 5.0 M H2O2 + 1.5 M HCl. ► PB improves performance of DBFC as compared to single Pt cathode electrocatalyst. ► DBFC using PB cathode attains peak power densities up to 200 mW cm−2.