In the present work, the cellulose-based materials were manufactured and used as components of electrochemical double layer capacitors (EDLCs). The preparation method of cellulose membranes as well as composite electrodes containing cellulose as a binder was presented. These materials were prepared using for the first time ionic liquid/dimethyl sulfoxide (IL/DMSO) mixture solvent. Obtained components displayed a uniform structure, thermal stability, and good electrochemical properties. The electrochemical performances of these materials were studied in 2-electrode EDLC cells by common electrochemical techniques as cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS). The composite electrodes were investigated in three types of electrolytes: aqueous, organic, and ionic liquids. The cellulose membranes were, however, soaked in an aqueous electrolyte and tested as hydrogel polymer electrolytes. All investigated materials show high efficiency in terms of specific capacity. The studied cellulose-based capacitors exhibited specific capacitance values in the range of 20-22 F g −1 , depending on the type of applied electrolyte.
In
recent years, the growing demand for increasingly
advanced wearable
electronic gadgets has been commonly observed. Modern society is constantly
expecting a noticeable development in terms of smart functions, long-term
stability, and long-time outdoor operation of portable devices. Excellent
flexibility, lightweight nature, and environmental friendliness are
no less important aspects of the choice of mobile electronics. Naturally,
electronic devices need efficient portable power sources (batteries
and supercapacitors) that meet the above-mentioned requirements. However,
most of these power sources use plastic substrates for their manufacture.
Hence, this review is focused on research attempts to shift energy
storage materials toward sustainable and flexible components. We would
like to introduce recent scientific achievements in the application
of noncellulosic polysaccharides for flexible electrochemical energy
storage devices as constituents in composite materials for both batteries
and supercapacitors. In this review, we will summarize the introduction
of biopolymers for portable power sources as components to provide
sustainable as well as flexible substrates, a scaffold of current
collectors, electrode binders, gel electrolyte matrices, separators,
or binding scaffolds for whole devices.
Biopolymer‐based materials have recently received great interest as potential components for wearable energy‐storage devices. They can offer attractive and valuable properties such as renewability, biocompatibility, thermal and chemical stability, flexibility, durability, and biodegradability. Herein, a wearable and flexible all‐solid‐state supercapacitor that uses chitin as a biocompatible scaffold for integrating all device components, such as electrodes and an electrolyte, is developed. Chitin provides mechanical stability to electrode materials and supports the ionic liquid‐based gel electrolyte, and it also acts as a bonding agent to integrate all those components. Additionally, titanium carbide MXene is used as an active material for the proposed power source device. The MXene/chitin‐based all‐solid‐state supercapacitor exhibits impressive electrochemical performance, showing outstanding electrode conductivity, high capacitance, low internal resistance, high power density, and long‐term cycling stability. Moreover, it provides highly desired features concerning wearable devices, that is, excellent flexibility and mechanical strength under bending deformations, as well as sustainability and biodegradability. As a proof of concept, the MXene/chitin‐base device is applied for powering an electronic gadget. Herein, an important step is represented toward power‐efficient, wearable, and sustainable energy‐storage devices.
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