Ultrahigh capacitance of nanoporous metal enhanced conductive polymer pseudocapacitors

► NPG-PPy hybrid electrodes are fabricated by combining dealloying and electropolymerization. ► Nanoporous hybrid structure facilitates charge transport and thus has low internal resistance. ► Ultrahigh energy densities of ∼100 Wh kg−1 in a 3-electrode configuration, comparable to NiMH batteries, can be achieved. ► High power density of ∼57 kW kg−1 is retained along with ultrahigh capacitance. ► The hybrid electrodes keep up to 85% the maximum capacitance after 3000 cycles.