Polar Organic Molecules Inserted in Vanadium Oxide with Enhanced Reaction Kinetics for Promoting Aqueous Zinc-Ion Storage

• Key Words:METAL-ORGANIC FRAMEWORK; POLYTHIOPHENE NANOPARTICLES; POLYANILINE; CARBON; NANOCOMPOSITES; FABRICATION; NANOSHEETS; COMPOSITE; GRAPHENE; ACID
• Abstract:Although the assumption of extending conductive polymer chains into the pores of metal-organic frameworks (MOFs) may make the ultrahigh inner surface area of MOFs electronically accessible and construct a 3D high surface area of PANI network, thereby enhancing supercapacitance performance, this assumption is hard to realize due to the narrow intrinsic pores, resulting in insufficient aniline feeding. This study introduces a novel approach to simultaneously overcome these limitations and achieve deep penetration of PANI by constructing a hollow and hierarchical MOF structure. The hollow hierarchical MIL-101 (HH-MIL-101) is prepared by selective etching the core and Al metal nodes of a Cr-Al bimetallic MIL-101 (CS-MIL-101). Subsequent electrochemical polymerization integrates PANI chains deeply inside the HH-MIL-101 frameworks, forming a PANI interwoven HH-MIL-101 hierarchical structure. This configuration enhances interfacial interaction and reduces the internal "dead space" that limits the utilization of internal pores and surface area. The HH-MIL@PANI electrode delivers a remarkable specific capacitance of 1934 mF cm(-2) at a current density of 1 mA cm(-2), 9.9 times that of PANI (195 mF cm(-2)), maintaining 90.1% of its capacity even after 5000 cycles. Furthermore, the symmetric all-solid-state supercapacitor device exhibits an energy density of 0.084 mWh cm(-2) at a power density of 0.62 mW cm(-2). This research establishes a novel framework for enhancing energy storage solutions, potentially advancing the field of wearable electronic technologies.
• Volume:510
• Issue:
• Translation or Not:no