Hierarchical core/shell Janus-type α-Fe2O3/PEDOT nanoparticles for high performance flexible energy storage devices. Issue 21 (9th May 2016)

• Record Type: Journal Article
• Authors: Park, Jin Wook; Na, Wonjoo; Jang, Jyongsik
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 21(2016)
• Page Start: 8263
• Page End: 8271
• Publication Date: 2016-05-09
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta01369d
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A new class of hierarchical α-Fe2 O3 /poly(3, 4-ethylenedioxythiophene) (PEDOT) core/shell Janus-type hybrid nanoparticles (HNPs) was successfully synthesized using sonochemical, liquid–liquid diffusion-assisted crystallization, and vapor deposition polymerization methods. Abstract : A new class of hierarchical α-Fe2 O3 /poly(3, 4-ethylenedioxythiophene) (PEDOT) core/shell Janus-type hybrid nanoparticles (HNPs) was successfully synthesized using sonochemical, liquid–liquid diffusion-assisted crystallization, and vapor deposition polymerization methods. The synthesized α-Fe2 O3 /PEDOT HNPs exhibited several unique properties, including a large surface area, high conductivity, excellent electrochemical properties, and high chemical stability. In addition, the α-Fe2 O3 /PEDOT HNPs reduced the dynamic resistance of electrolyte ions, and enabled high charge–discharge rates and stable expansion of the cell voltage up to 2.0 V, thereby enabling high-performance supercapacitance. These results were attributed to synergetic effects between iron oxide (core structure with a negative working potential window) and PEDOT (shell structure with a positive working potential window), resulting in performance enhancements of specific capacitance (252.8 F g −1 ) and energy (136.3 W h kg −1 ) and power densities (10 526 W kg −1 ). The specific capacitance exhibited 92% retention after 1000 cycles. Additionally, a flexible supercapacitor based on the α-Fe2 O3 /PEDOT HNPs was successfully demonstrated using a hydrogel electrolyte. The fabricated all-solid-state symmetrical supercapacitor produced superior electrochemical and mechanical performance, even after several bending motions.