Abstract
Paper-like flexible electrode becomes one of the most important research objects in energy storage. In the present work, sandwich-structured S-doped reduced graphene oxide/carbon nanotubes/polyaniline (S-rGO/CNTs/PANI) composite membranes were designed as free-standing electrodes for high-performance supercapacitors, by electro-deposition of polyaniline (PANI) onto the flexible and robust sandwich-structured S-doped reduced graphene oxide/carbon nanotubes (S-rGO/CNTs) composite films as highly conductive supports, which were prepared through a mild hydrothermal reduction and doping reaction of graphene oxide (GO) nanosheets in presence of multi-walled carbon nanotubes (MW-CNTs), with Na2S as not only a sulfur precursor, but also a high-efficient reducing agent. The S-rGO/CNTs/PANI composite membrane electrode possessed high specific capacitance (812F/g) in 1.0M H2SO4 aqueous solution, with excellent rate capability and cycling stability for supercapacitors without the need of current collectors and binders, showing significant potential in flexible energy storage devices.
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