In this study, hydrogel electrolytes (HEs) with the immobilized pair ions (IPIs) were studied for carbon-based supercapacitors. HEs with immobilized cations (ICs), IPIs, and immobilized anions (IAs) were prepared by controlling the mole ratio of [2-(acryloyloxy)ethyl]trimethylammonium chloride and 2-acrylamido-2-methyl-1-propanesulfonic acid sodium via random copolymerization with poly(ethylene glycol) diacrylate. HEs (IC-Na2SO4, IPI-Na2SO4, IA-Na2SO4, and PVA(Polyvinyl alcohol)-Na2SO4) was simply prepared by 1 M Na2SO4(aq) intake. The ionic conductivities of IC-Na2SO4, IPI-Na2SO4, IA-Na2SO4, 1 M Na2SO4(aq), and PVA-Na2SO4 were 37.7 mScm−1, 81.6 mScm−1, 62.9 mScm−1, 56.8 mScm−1, and 0.135 mScm−1 at 25 °C via electrochemical impedance spectroscopy. Based on the dielectric analysis, IPI-Na2SO4 with showed the largest dielectric constant was chosen for the supercapacitors test. Carbon-based symmetric supercapacitors (CSSs) were assembled with 1 M Na2SO4(aq) (CSS-aq), PVA-Na2SO4 (CSS-PVA), and IPI-Na2SO4 (CSS-IPI). Electrochemical windows (EWs) of CSS-aq, CSS-PVA, and CSS-IPI were respectively 1.2 V, 1.3 V, and 1.9 V via cyclic voltammetry. The specific capacitances of CSS-aq, CSS-PVA, and CSS-IPI were respectively 125 Fg−1, 71 Fg−1, and 246.2 Fg−1 at current density of 0.5 Ag−1. Since IPI-Na2SO4 possesses 1.43 times ionic conductivity and 1.58 times EW of the 1 M Na2SO4(aq), it also possessed the remarkable energy density of 121.3 Wh Kg−1 and high power density of 38,424.6 W Kg−1 with 5000 charge/discharge cycles.
|Number of pages||7|
|Journal||Journal of the Taiwan Institute of Chemical Engineers|
|Publication status||Published - 2021 Jan|
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)