Carbon dots integrated into nickel-cobalt hydroxide as superior electrode for supercapattery

•A high-performance nickel electrode integrated with Co and carbon dots (CD-Co/Ni(OH)2) has been prepared by cathodic electrodeposition.•The introduction of Co greatly improves the stability of the Ni(OH)2 electrode, particularly at high current density.•The CDs-Co/Ni(OH)2 electrode presents a high specific capacitance and an excellent capacitance retention.•The Ni/Zn supercapattery assembled with a zinc flake as negative electrode and a CDs-Co/Ni(OH)2 electrode as positive electrode exhibits high power density, high energy density and remarkable cycling stability.