Flexible electrode materials with high volumetric capacitance are promising to applications in portable and wearable capacitive storage devices. Here, we utilized the highly flexible and conductive NP-Ag substrate to successfully develop a flexible nanoporous Ag@Co(OH)2 (NP–Ag@Co(OH)2) thin film electrode. After 100 multiple bending cycles, the NP-Ag@Co(OH)2 electrode can keep the original nanostructures and flexibility. The flexible NP-Ag@Co(OH)2 electrode exhibits the high volumetric capacitance of 929 F cm−3 at a current density of 2 A cm−3, which is higher than many reported supercapacitor electrodes.
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