Amphiphilic ligand exchange reaction-induced supercapacitor electrodes with high volumetric and scalable areal capacitances

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>We introduce high-performance supercapacitor electrodes with ternary components prepared from consecutive amphiphilic ligand-exchange-based layer-by-layer (LbL) assembly among amine-functionalized multi-walled carbon nanotubes (NH<SUB>2</SUB>-MWCNTs) in alcohol, oleic acid-stabilized Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles (OA-Fe<SUB>3</SUB>O<SUB>4</SUB> NPs) in toluene, and semiconducting polymers (PEDOT:PSS) in water. The periodic insertion of semiconducting polymers within the (OA-Fe<SUB>3</SUB>O<SUB>4</SUB> NP/NH<SUB>2</SUB>-MWCNT)<SUB>n</SUB> multilayer-coated indium tin oxide (ITO) electrode enhanced the volumetric and areal capacitances up to 408 ± 4 F cm<SUP>−3</SUP> and 8.79 ± 0.06 mF cm<SUP>−2</SUP> at 5 mV s<SUP>−1</SUP>, respectively, allowing excellent cycling stability (98.8% of the initial capacitance after 5000 cycles) and good rate capability. These values were higher than those of the OA-Fe<SUB>3</SUB>O<SUB>4</SUB> NP/NH<SUB>2</SUB>-MWCNT multilayered electrode without semiconducting polymer linkers (volumetric capacitance ∼241 ± 4 F cm<SUP>−3</SUP> and areal capacitance ∼1.95 ± 0.03 mF cm<SUP>−2</SUP>) at the same scan rate. Furthermore, when the asymmetric supercapacitor cells (ASCs) were prepared using OA-Fe<SUB>3</SUB>O<SUB>4</SUB> NP- and OA-MnO NP-based ternary component electrodes, they displayed high volumetric energy (0.36 mW h cm<SUP>−3</SUP>) and power densities (820 mW cm<SUP>−3</SUP>).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Supercapacitor electrodes were prepared using amphiphilic layer-by-layer assembly. </LI> <LI> Ternary active components were covalently bonded through in situ ligand exchange reactions. </LI> <LI> Areal and volumetric capacitances of the multilayer electrodes were greatly enhanced. </LI> <LI> Energy performance was easily controlled by the bilayer number. </LI> <LI> The formed devices exhibited reliable operation stability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Ternary component-based supercapacitor electrodes with high volumetric and scalable areal capacitances were prepared from consecutive amphiphilic ligand-exchange-based layer-by-layer assembly.</P> <P>[DISPLAY OMISSION]</P>