Porous three-dimensional(3D)structures generally improve the performance of electrodes by increasing their active surface area and the diffusion speed of electrolyte ions during charging/discharging.Three-dimensional polypyrrole(PPy)based films were created by electrodepositing PPy in the presence of vary-ing amounts of chloride anions(Cl-)and polyanionic ribbonlike nanoparticles(carboxylated cellulose nanocrystals(CNC-COO-))as scaffold material.The assembly mechanism of the 3D PPy electrodes com-bines the effect of different nucleation and growth mechanisms during electropolymerization and depo-sition of the formed PPy with CNC-COO-and with Cl-.The highest area capacitance of these electrode materials was 1.39 F cm-2(150.2 F g-1)at a current density of 1 mA cm-2(0.1 Ag-1).More importantly,at a high current density of 20 mA cm-2(2.2 A g-1),the thick(ca.130 μm),3D,and high mass loading(9.2 mg cm-2)Cl-:CNC-COO-/PPy films exhibited an excellent areal capacitance of 0.85 F cm-2(70.8 F g-1).increasing about 16％over CNC-COO-/PPy films prepared without Cl-present during electrodeposi-tion.In addition,an aqueous Cl-:CNC-COO-/PPy(with Cl-:CNC-COO-=2.0)symmetric supercapacitor had an outstanding energy density of 41.15 μWh cm-2(4.46 Wh kg-1)and excellent cycling stability,while even improving on its original areal capacitance(to 111.2％of its original capacitance)after cycling 3000 cycles at 8 mA cm-2,indicating their potential in energy storage devices.

Zuxin Sun;Samuel Eyley;Yongjian Guo;Reeta Salminen;Wim Thielemans

Sustainable Materials Lab,Department of Chemical Engineering,KU Leuven,Campus Kulak Kortrijk,Etienne Sabbelaan 53,8500 Kortrijk,Belgium;Research Unit Plasma Technology,Department of Applied Physics,Ghent University,Sint-Pietersnieuwstraat 41,B4,9000 Ghent,Belgium

能源化学

[1]Zuxin Sun;Samuel Eyley;Yongjian Guo;Reeta Salminen;Wim Thielemans-.Synergistic effects of chloride anions and carboxylated cellulose nanocrystals on the assembly of thick three-dimensional high-performance polypyrrole-based electrodes)[J].能源化学,2022(07):492-501

electrodepositing,polyanionic,ribbonlike,electrodeposi

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