Login / Signup

Kinetics-Favorable Ultrathin NiCo-MOF Nanosheets with Boosted Pseudocapacitive Charge Storage for Quasi-Solid-State Hybrid Supercapacitors.

Han LiXuefeng WangLinlin DaiFengjiao GuoHongyu MiChenchen JiLuyi Sun
Published in: Inorganic chemistry (2022)
Bimetallic metal-organic frameworks (MOFs) with an ultrathin configuration are compelling materials for developing high-performance energy storage devices on account of their unique structural merits. Herein, a hydrangea-like NiCo-MOF is well prepared using controllable solvothermal and cation-exchange processes, synchronously achieving bimetallic nodes and hierarchical ultrathin architecture. The structural superiority enables NiCo-MOF of expanded electrons' transfer pathways and multitudinous electrolytes' diffusion channels, resulting in a significant enhancement in pseudocapacitive performance. Coupling with the bimetallic nature and constructional advantages, NiCo-MOF shows superior gravimetric capacity (832.6 C g -1 at 1 A g -1 ) and electrochemical kinetics to those of monometallic Ni-MOF and Co-MOF. Importantly, the quasi-solid-state hybrid supercapacitor (HSC) based on the NiCo-MOF cathode and active carbon (AC) anode delivers a desirable energy density (45.3 Wh kg -1 at 847.8 W kg -1 ), a favorable power density (7160.0 W kg -1 at 23.3 Wh kg -1 ), a remarkable cyclability (82.4% capacity retention over 7000 cycles), and a capability of driving miniature electronics, exhibiting its potential in practical applications. This work presents an efficient design strategy to develop kinetics-favorable MOF materials for energy storage.
Keyphrases
  • metal organic framework
  • solid state
  • reduced graphene oxide
  • ionic liquid
  • gold nanoparticles
  • early stage
  • high resolution
  • mass spectrometry
  • lymph node
  • radiation therapy
  • highly efficient
  • aqueous solution