Conductive and porous ZIF-67/PEDOT hybrid composite as superior electrode for all-solid-state symmetrical supercapacitors

• Published in: Journal of alloys and compounds Vol. 843; p. 155992
• Main Authors: Shrivastav, Vishal, Sundriyal, Shashank, Kaur, Ashwinder, Tiwari, Umesh K., Mishra, Sunita, Deep, Akash
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 30.11.2020; Elsevier BV
• Subjects: Charge transfer; Composite materials; Conductivity; Electrochemical analysis; Electrodes; Energy storage; Flux density; Heterostructures; Hybrid composites; Hybrid materials; Metal-organic frameworks; PEDOT; Porous materials; Reagents; Solid state; Supercapacitors; Symmetrical supercapacitor; ZIF-67; PEDOT; Symmetrical supercapacitor; Hybrid materials; ZIF-67; Energy storage
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2020.155992

The application of porous and conductive composite materials in energy storage devices has received great attention in the recent years. Porous materials, such as metal-organic frameworks (MOFs), possess features like large specific surface area, mesoporous structures, and multiple reaction sites that make them attractive for energy storage devices. Further, the integration of MOFs with suitable conducting agents is a promising strategy to introduce additional conductive pathways in them, which facilitates fast charge transfer. In the present work, we report synthesis and supercapacitor application of a ZIF-67/PEDOT heterostructure composite. The prepared ZIF-67/PEDOT composite, when analyzed for electrochemical performance in three-electrode systems, has delivered a specific capacitance of 106.8 F/g at a current density of 1 A/g. This value is significantly better than that attaintable with only pristine ZIF-67 electrode (34.75 F/g at 1 A/g). Extending the study, two ZIF-67/PEDOT electrodes have been used to assemble an all-solid-state symmetrical supercapacitor, which delivers excellent values of energy density (∼11 Wh/kg) and power density (200 W/kg). Hence, this work paves the way for the potential application of ZIF-67/PEDOT composite in the development of next-generation supercapacitors. [Display omitted] •Incorporation of PEDOT in ZIF-67 benefits high conductivity and large specific surface area.•ZIF-67/PEDOT has been explored as a supercapacitor electrode material.•The assembled 1.6 V device delivered high energy (11 Wh/kg) and power (200 W/kg) densities.•Supercapacitor device has a long cycle life (93% capacity retention even after 4000 charge-discharge cycles).