Synthesis, Structure, and Electrochemical Properties of Some Cobalt Oxalates.
Jinghua CaiYuanqi LanHaiyan HeXinyuan ZhangAnthony Robert ArmstrongWenjiao YaoPhilip LightfootYongbing TangPublished in: Inorganic chemistry (2020)
Transition-metal oxalates have wide applications in magnetics, photoemission, electrochemistry, etc. Herein, using hydrothermal reactions, five cobalt(II) oxalates, Na2Co2(C2O4)3·2H2O (I), Na2Co(C2O4)2·8H2O (II), KLi3Co(C2O4)3 (III), Li4Co(C2O4)3 (IV), and (NH4)2Co2(C2O4)F4 (V) have been synthesized, and their structures are determined from single-crystal X-ray diffraction or Rietveld refinement of powder X-ray diffraction data. Notably, IV and V are identified for the first time. The structures of these cobalt oxalates are versatile, covering 0D, 1D, 2D, and 3D frameworks, while the coordination environments of Co2+ centers are uniquely distorted octahedra. As representative examples, I and III are investigated as cathode materials for secondary batteries. Both exhibited electrochemical activity despite large cell polarization. The present study enriches the transition-metal oxalate family and provides new options for energy storage materials.
Keyphrases
- transition metal
- reduced graphene oxide
- high resolution
- gold nanoparticles
- electron microscopy
- solid state
- dual energy
- ionic liquid
- metal organic framework
- carbon nanotubes
- ion batteries
- molecularly imprinted
- single cell
- electronic health record
- computed tomography
- crystal structure
- cross sectional
- cell therapy
- mass spectrometry
- room temperature
- risk assessment
- mesenchymal stem cells
- magnetic resonance imaging
- bone marrow
- atomic force microscopy
- heavy metals
- tandem mass spectrometry
- simultaneous determination
- contrast enhanced