Abstract
HighlightsAn ultra-microporous carbon material simultaneously with high specific surface area (1554 m2 g−1) and packing density (1.18 g cm−3) is designed and fabricated.The resulting carbon material integrates the high gravimetric and volumetric capacitance (430 F g−1 and 507 F cm−3 at 0.5 A g−1) and thereof provides the robust all-solid-state cellulose supercapacitor with high areal and volumetric density.
Highlights
With the booming development of electric transportation and electronics, there are increasing demands for sustain‐ able and renewable energy conversion and storage devices [1]
A unique porous carbon is designed by opti‐ mization of pore structure and regulation of carbonaceous constituent to achieve high integrated capacitance
As illus‐ trated in Fig. 1a, the bacterial cellulose nanofibers (BC) nanofibers are pretreated by KOH solution, which results in 3D ions–fiber complex rich in strong electrostatic interaction
Summary
With the booming development of electric transportation and electronics, there are increasing demands for sustain‐ able and renewable energy conversion and storage devices [1]. Faced with challenges of complicated applications, the next-generation electrode materials with excellent integrated capacitive performances including high gravimetric, volu‐ metric, and areal capacitance are much demanded. Over the past few years, numerous efforts have been undertaken to achieve the excellent gravimetric and volu‐ metric performance of pseudocapacitive electrode materi‐ als including transition metals [4], conducting polymers [5], pseudocapacitive 2D materials [6], and their com‐ posites [7]. Compared with transition metals and conductive polymer materials, carbon materials are considered as more promising electrode materials for ultra-stable and high-performance supercapacitors due to the tunable packing structure, excellent doping modification, and good electrical conductivity [2]. There is still a need for efforts on developing low-cost, sustainable, and stable electrode materials with further improved integrated capacitance for advanced supercapacitors
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