Carbonized Wood‐Supported NiMg‐MOF/PANI/rGO Nanocomposite for Battery‐Supercapacitor Hybrid Energy Storage

Abstract

Abstract Renewable wood‐derived substrates offer a sustainable and multifunctional platform for advanced energy materials. In this study, a novel NiMg‐MOF/PANI/rGO nanocomposite was synthesized via a hydrothermal method and uniformly deposited on carbonized wood sheets (CWS). The NiMg‐MOF/PANI/rGO composite showed a large value of surface area of 0.027 cm 2 /g. In a three‐electrode configuration, the NiMg‐MOF/PANI/rGO electrode displays a specific capacity (Qs) of 1342.8 C/g at 1.2 Ag −1 . The flexible asymmetric supercapacitor (ASC) delivered a high Qs of 214.6 C g −1 at 1.5 A g −1 , together with an impressive energy density ( E d ) of 98.1 Wh kg −1 and a power density ( P d ) of 2269.7 W kg −1 . The ASC also revealed superior cycling stability, maintaining 90.1% of its initial capacity and 95.9% Coulombic efficiency. These outcomes confirm that the NiMg‐MOF/PANI/rGO electrode is a capable and durable candidate for next‐generation flexible and sustainable energy technologies.