▎ 摘　　要

NOVELTY - An electrode comprises dye methylene blue linked to polyoxoniobate associated with a carbon material. USE - Electrode used in energy storage devices, e.g. batteries and supercapacitors (all claimed). ADVANTAGE - The electrode has high negative charge and high coulombic efficiency (99%) for 50000 cycles. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of electrode.