Necklace-like Nitrogen-Doped Tubular Carbon 3D Frameworks for Electrochemical Energy Storage


YÜKSEL R., Buyukcakir O., Panda P. K., Lee S. H., Jiang Y., Singh D., ...More

ADVANCED FUNCTIONAL MATERIALS, vol.30, no.10, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 30 Issue: 10
  • Publication Date: 2020
  • Doi Number: 10.1002/adfm.201909725
  • Journal Name: ADVANCED FUNCTIONAL MATERIALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: energy storage, metal-organic frameworks, supercapacitors, tetrapods, zinc-ion capacitors, ZEOLITIC IMIDAZOLATE FRAMEWORK, METAL-ORGANIC FRAMEWORKS, HIGH-PERFORMANCE, HOLLOW CARBON, FILM, SUPERCAPACITORS, ELECTRODES, BATTERIES, NANORODS, ZIF-8
  • Eskisehir Osmangazi University Affiliated: No

Abstract

The design and synthesis of a necklace-like nitrogen-doped tubular carbon (NTC) are presented by growing microporous polyhedral ZIF-8 particles and a uniform layer of ZIF-8 on sacrificial ZnO tetrapods (ZTPs). Oxygen vacancies together with defect regions on the surface of the ZTPs result in the formation of ZIF-8 polyhedra in conjunction with a very thin shell. This necklace-like NTC structure has a high N content, very large surface area, ultrahigh microporosity, and quite high electrical conductivity. NTC-based symmetrical supercapacitor and zinc-ion capacitor (ZIC) devices are fabricated and their electrochemical performance is measured. The NTC supercapacitor shows an ultrahigh rate capability (up to 2000 mV s(-1)) and promising cycle life, retaining 91.5% of its initial performance after 50 000 galvanostatic charge-discharge cycles. An aqueous ZIC, constructed using the NTC, has a specific capacitance of 341.2 F g(-1) at a current density of 0.1 A g(-1) and an energy density of 189.6 Wh kg(-1) with a 2.0-V voltage window, respectively. The outstanding performance is attributed to the NTC high N-doping content, a continuous "polyhedral 3D hollow" architecture and the highly porous microtubular arms exhibiting very high surface area.