Multi‐walled carbon nanotubes incorporation into cross‐linked novel alkaline ion‐exchange membrane for high efficiency all‐solid‐state supercapacitors

Abstract

Summary An increasing number of focus has been paid to the study of supercapacitors in the context of the increasing demand for energy storage. As an important component of supercapacitors, the electrolyte has become a focus of research. In this work, an inexpensive and readily approach for synthesizing the polymer electrolytes was established by introducing multi‐walled carbon nanotubes (MWCNTs) as the filler on the basis of cross‐linked chitosan (CS) and poly‐(diallyldimethylammonium chloride) (PDDA), followed by a facile ion‐exchange in the KOH solution. The resultant MWCNTs‐CP‐OH− membrane manifests superb chemical stability, high hydroxide conductivity (0.033 S cm−1), and enhanced mechanical/chemical properties. Consequently, the fabricated all‐solid‐state supercapacitors using MWCNTs‐CP‐OH− composite membrane as a polymer electrolyte displayed prominent cyclic stability over 4000 cycles with 75.3% retention of the capacitance. Aforementioned merits make the MWCNTs‐CP‐OH− membrane highly promising candidate electrolyte material in all‐solid‐state supercapacitors.

Fabrication of High-Alkaline Stable Quaternized Poly(arylene ether ketone)/Graphene Oxide Derivative Including Zwitterion for Alkaline Fuel Cells

“…In addition, the peak power density of MEAs based on QPAEK, QPAEK@GO-MO 0.7 wt %, and AHA membranes was 136.2 mW cm –2 at 224.9 mA cm –2 , 303.2 mW cm –2 at 724.2 mA cm –2 , and 45.7 mW cm –2 at 76.4 mA cm –2 , respectively. Apparently, the QPAEK@GO-MO 0.7 wt % membrane had by far the highest peak power density, indicating that the introduction of filler into the polymer matrix can decrease internal ohmic resistance in a membrane . Further, high frequency resistance (HFR) results of MEAs based on the present membranes are plotted in Figure a.…”

“…Apparently, the QPAEK@GO-MO 0.7 wt % membrane had by far the highest peak power density, indicating that the introduction of filler into the polymer matrix can decrease internal ohmic resistance in a membrane. 67 Further, high frequency resistance (HFR) results of MEAs based on the present membranes are plotted in Figure 8a. The HFR of QPAEK@GO-MO 0.7 wt % membrane was an almost constant value of 0.052 Ω cm −2 , much lower the than those of the QPAEK (0.122 Ω cm −2 ) and AHA (0.132 Ω cm −2 ) membranes, which may be attributed to its more distinctly separated microphase morphology and its increased ion conductivity.…”

A Prospective Concept on the Fabrication of Blend PES/PEG/DMF/NMP Mixed Matrix Membranes with Functionalised Carbon Nanotubes for CO2/N2 Separation

“…The semi-crystalline polymer materials go through the process of extruding and stretching [ 122 ]. The process is a solvent-free technique where the polymer gets heated past its melting point and extruded until a thin sheet is formed, followed by stretching [ 123 , 124 , 125 , 126 ]. Stretching has two steps, the first being cold stretching, which allows the creation of micropores in the thin film.…”

“…The polymer solution is submerged in a non-solvent (typically water) coagulation tank. Demixing and precipitation occur due to an interaction between the solvent (from a polymer solution) and the non-solvent (from a coagulation bath), i.e., the solvent and non-solvent must be miscible [ 123 ]. Thermally induced phase separation (TIPS) is an approach the focuses on the phenomenon that generally decreases solvent content when the temperature is lowered.…”