Nickel-Based Nanocomposites in Supercapacitor and Biosensing Applications: A Review of Ag/NiOOH Nanorods as A Case Study

The demand for advanced materials with high electrochemical performance has surged with the rise of energy storage and biosensing technologies. Nickel-based nanocomposites, such as NiOOH, are gaining prominence due to their high redox activity, low toxicity, and structural tunability. This review explores the recent development of Ag-decorated NiOOH nanorods synthesized via cyclic voltammetry and sputter deposition, originally designed for nonenzymatic urea sensing. Through structural, morphological, and electrochemical characterizations, we analyze their potential dual-use capabilities in both biosensors and supercapacitor electrodes. The observed synergistic behavior between Ag nanoparticles and NiOOH provides a template for developing multifunctional energy devices operating under neutral pH—bridging the gap between biomedical and energy storage technologies.