Premium
Hydrazine reduction of LaNiO 3 for active materials in supercapacitors
Author(s) -
Ho KuanHung,
Wang John
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14997
Subject(s) - lanio , pseudocapacitor , hydrazine (antidepressant) , electrolyte , materials science , supercapacitor , electrochemistry , conductivity , electrical resistivity and conductivity , capacitance , chemical engineering , electrode , inorganic chemistry , chemistry , optoelectronics , electrical engineering , chromatography , dielectric , ferroelectricity , engineering
To improve the electric conductivity and overall performance of active materials in pseudocapacitors, we have established a novel hydrazine reduction process to transform perovskite oxides into active materials with the desired electrical conductivity and electrochemical behavior. Taking LaNiO 3 ( LNO ) produced from chemical solution as the starting material, different durations of hydrazine reduction (e.g. from 3, 6 to 12 hours) leads to a significant increase in specific capacitance, from ~70 F·g −1 at 1 A·g −1 ( LNO ) to ~280 F·g −1 at 1 A·g −1 (after 12 hours reduction). The desired electrical conductivity of LNO has been retained, as shown by the overall resistance of less than 0.3 Ω in the aqueous electrolyte. The hydrazined LNO demonstrated the desired stability as electrode, where the porous structure provides better accessibility for electrolytes, which is helpful in enhancing the overall electrochemical behaviors.