Abstract
With the continuous development of energy storage devices towards sustainability and versatility, the development of biomass-based multi-functional energy storage devices has become one of the important directions. In this study, a symmetric dual-function supercapacitor was constructed based on a cellulose network/polyacrylamide/polyaniline (CPP) composite hydrogel. The presented supercapacitor, with excellent electrochemical performance and an areal capacitance of 1.73 mF/cm2 at 5 mV/s, an energy density of 0.62 µW h/cm2 at a power density of 7.03 µW/cm2, a wide electrochemical window of 1.6 V and a promising cycling stability, can be achieved. The transmittance of the supercapacitor at 500 nm decreased by 9.6% after the electrification at 3 V, and the device can exhibit periodic transmittance change under the square potential input between 0.0 V and 3.0 V at regular intervals of 10 s. The present construction strategy provides a basis for the preparation of multifunctional devices with natural renewable materials and structures.
Highlights
The increasing energy demand and the outbreak of environmental crises drive human beings to pursue environmentally friendly, multifunctional energy storage materials and multifunctional energy storage devices [1]
Indium tin oxide (ITO) conductive glass was introduced as a composite hydrogel (Figure 1a)
cellulose network/polyacrylamide/polyaniline (CPP) composite hydrogels with electrochromic properties were successfully prepared based on a wood cellulose network through vacuum impregnation and electrochemical deposition, and this enabled the fabrication of symmetric electrochromic supercapacitors (ESCs)
Summary
The increasing energy demand and the outbreak of environmental crises drive human beings to pursue environmentally friendly, multifunctional energy storage materials and multifunctional energy storage devices [1]. As an energy storage device with an optical function, electrochromic supercapacitors (ESCs) have attracted much attention because of their advantages, such as rapid color change and efficient energy storage, while meeting specific application needs, such as smart windows, electronic paper, and auto-dimmer rearview mirrors [2,3,4]. Current electrochromic materials mainly include transition metal oxides (such as WO3 and V2 O5 ) [5,6,7], Prussian blue, and conductive polymers (such as polyaniline (PANI) and polythiophene) [3]. Serves as a cathodically coloring material, with PANI as an anodically coloring material, and there is a simultaneous complementary coloration for both of them in the electrochromic application. PANI has shown excellent compatibility with cellulosic materials (e.g., cellulose networks) to prepare novel electrode materials and biomass-based energy storage devices [12]
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