3D Porous Mixed-Valent Manganese Oxide Nanosheets Electrodeposited onto Flexible Ag-CNT Textiles for Highly Improved Capacitive Performances

A simple yet efficient one-pot ultrasonication process for the green preparation of a silver-carbon nanotube (Ag-CNT) ink, which was then used to fabricate conductive flexible thin films by a simple immersion process, is reported. A novel three-dimensional (3D) porous, hierarchical Ag-MnOx-CNT nanocomposite was synthesized by electrodeposition of manganese oxide (MnOx) nanosheets composed of MnO2 and Mn3O4 onto the Ag-CNT films. The unique Ag-MnOx-CNT electrode showed a specific capacitance of 842F/g at 1A/g and excellent charge-discharge cycling stability, with a capacitance retention of 148% at 10A/g and a Coulombic efficiency of similar to 90% after 5000 cycles. The greatly enhanced capacitive performance is ascribed to the facile redox reactions, 3D porous framework, and use of Ag NPs. These impressive results suggest that this nanocomposite is a promising candidate for use in high-performance flexible energy storage applications.