Integrating a redox-coupled FeSe2/N–C photoelectrode into potassium ion hybrid capacitors for photoassisted charging

Energy-level-matched integrated photoelectrode with a 35.7% (∼0.05 eV) reduction in the reaction barrier based on electron–hole pair synergy under light irradiation, the as-prepared hybrid device achieves a capacitance of ∼123.9 W h kg −1 in 3 A g −1 .