View article

Construction of advanced electrode materials with unique performance for supercapacitors (SCs) is essential to achieving high implementation in the commercial market. Here, we report a novel peripheral octamethyl-substituted nickel(II) phthalocyanine (NiMe₂Pc)-based nanocomposite as the electrode material of all-solid-state SCs. The highly redox-active NiMe₂Pc/carboxylated carbon nanotube (CNT-COOH) dendritic nanocomposite provides rapid electron/electrolyte ion-transport pathways and exhibits excellent structural stability, resulting in high-capacity activity and impressive cycling stability. The composite prepared with the optimized weight ratio of NiMe₂Pc:CNT-COOH (6:10) showed the highest specific capacitance of 330.5 F g⁻¹ at 0.25 A g⁻¹. The constructed NiMe₂Pc/CNT-COOH-based all-solid-state symmetric SC device showed excellent performance with a maximum energy density of 22.8 Wh kg …