Impact of electrolyte on pseudocapacitance and stability of porous titanium nitride (TiN) monolithic electrode
George Hasegawa, Atsushi Kitada, Shota Kawasaki, Kazuyoshi Kanamori, Kazuki Nakanishi, Yoji Kobayashi, Hiroshi Kageyama, Takeshi Abe. Journal of the Electrochemical Society, 2015, 162, A77-A85.
We report the fabrication of porous titanium nitride (TiN) monoliths through the ammonolysis of porous TiO2
monoliths prepared via the sol–gel process accompanied by phase
separation. The obtained TiN monoliths possess good mechanical strength
as well as excellent electric conductivity with a superconducting
transition at Tc ~5.0 K. We have investigated the
electrochemical properties of the porous TiN monoliths as an electrode
using various electrolytes. The results reveal that the
pseudocapacitance of TiN increases in the order of K+ < Na+ < Li+
contrary to the case of EDL capacitance in neutral aqueous
electrolytes. It is also found that acidic and strongly basic
electrolytes are not suitable due to high corrosivity, while there is no
significant deterioration when neutral aqueous electrolytes and organic
electrolytes are used.