Design of a novel 3D hierarchical network porous CNS@Ag0.5@Co-180-10/GNPs hetero-nanostructure hybrid as an excellent electrode for supercapacitor

The increasing demands for green sustainable energy have motivated much interest and attention in energy conversion systems. In this work, 3D hierarchical network porous CNS@Ag-0.5@Co-180-10/GNPs hetero-nanostructure hybrid was successfully designed and fabricated via a multistep transformation approach of liquid-phase reduction procedure and subsequent hydrothermal activation pathway, through using a facile heteroatoms synergistic-doping cobalt-based AgCo hybrid and precursor assisted-templating strategy. Here, the chemical compositions, structure parameters and electrochemical performances of C, N, S-tri-doped Ag@Co composites precursor can be simply tuned by adjusting the requirement of Ag content in alloys, hybridization temperature and activation time. It was found that the typical CNS@Ag-0.5@Co180-10/GNPs material possessed a molar ratio of 0.5:1 of Ag and Co, hybridized at 180 degrees C and activated for 10 h is endowed with large specific surface area (1370 m(2) g(-1)), suitable porosity (wider mesopores and narrow micropores), unique morphology (porous 3D hierarchical network structure) and outstanding electrochemical performance (657.6 F g(-1) at 1 A g(-1) for specific capacitance, 97.11% at a current density of 15 A g(-1) after 5000 cycles for capacitance retention), providing a new insight to design a promising electrode materials for high-performance supercapacitors. (C) 2020 Elsevier Ltd. All rights reserved.