Articles you may be interested inInsights into the ultraviolet spectrum of liquid water from model calculations: The different roles of donor and acceptor hydrogen bonds in water pentamers J. Chem. Phys. 137, 184301 (2012); 10.1063/1.4764044 High-resolution ultraviolet spectroscopy of p -fluorostyrene-water: Evidence for a σ -type hydrogen-bonded dimer Structures of hydrogen-bonded clusters of benzyl alcohol with water investigated by infrared-ultraviolet double resonance spectroscopy in supersonic jet J. Chem. Phys. 111, 8438 (1999); 10.1063/1.480184 Microscopic solvent structure of subcritical and supercritical methanol from ultraviolet/visible absorption and fluorescence spectroscopiesAn in situ Raman spectroscopy study of subcritical and supercritical water: The peculiarity of hydrogen bonding near the critical point UV-visible spectra of quinoline was measured in sub-and supercritical water (25°CϽT Ͻ430°C and 0.1 MPaϽ PϽ40 MPa͒, and the degree of hydrogen bonding between quinoline and water was estimated from solvatochromic shifts in the -* absorbance band. Hydrogen bonding decreased with increasing temperature from 25 to 360°C. At supercritical conditions (380°CϽT Ͻ400°C), hydrogen bonding abruptly decreased where the isothermal compressibility of water was large (0.5Ͻ r Ͻ1.5). In this condition, local density around quinoline was lower than bulk density, namely negative solvation, and it led to the cleavage of hydrogen bonding between quinoline and water.

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Preparation and Electrochemical Characterization of LiCoO 2 Particles Prepared by Supercritical Water Synthesis.-LiCoO 2 particles are synthesized in a flow-type supercritical water synthesis (SCWS) apparatus using LiOH and Co(NO 3 ) 2 as starting materials and H 2 O 2 dissolved in the supercritical water as oxygen source. The LiCoO 2 crystals have a rhombohedral shape and a particle size of ¡1 µm. The material exhibits good reversibility in the intercalation/deintercalation of lithium and optimization of the SCWS conditions may provide a very stable LiCoO 2 cathode material. -

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LiCoO2 single crystal particles were obtained by super critical water synthesis (SCWS) under optimized preparation conditions. The particle size of the LiCoO2 was less than 1 μm, which was much smaller than that of LiCoO2 prepared by a standard method. However, some unknown crystalline and amorphous phases coexisted with the well defined LiCoO2 single crystal particles. The discharge and charge characteristics of the LiCoO2 prepared by the SCWS were examined by some electrochemical methods. In the first cycle, an irreversible behavior was observed, and then the gradual decrease of the discharge capacity with discharge and charge cycle was also detected. The stable discharge capacity was estimated to be 80 mA h g−1 after the 100th cycle. This result may be due to the existence of amorphous phases and some structural defects.