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Sökning: WFRF:(Ruoff Rodney S.)

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1.
  • Whelan, Patrick R., et al. (författare)
  • Fermi velocity renormalization in graphene probed by terahertz time-domain spectroscopy
  • 2020
  • Ingår i: 2D Materials. - : IOP Publishing. - 2053-1583. ; 7:3
  • Tidskriftsartikel (refereegranskat)abstract
    • We demonstrate terahertz time-domain spectroscopy (THz-TDS) to be an accurate, rapid and scalable method to probe the interaction-induced Fermi velocity renormalization nu F*10(12) cm(-2), Fermi level > 0.1 eV). From an application point of view, the ability to rapidly and non-destructively quantify and map the electrical (sigma(DC), n, mu) and electronic ( nu F*
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2.
  • Yuksel, Recep, et al. (författare)
  • Necklace-like Nitrogen-Doped Tubular Carbon 3D Frameworks for Electrochemical Energy Storage
  • 2020
  • Ingår i: Advanced Functional Materials. - : Wiley. - 1616-301X .- 1616-3028. ; 30:10
  • Tidskriftsartikel (refereegranskat)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.
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