Titanium nitride films for micro-supercapacitors: Effect of surface chemistry and film morphology on the capacitance

Plasma-assisted nitrogen doping of VACNTs for efficiently enhancing the supercapacitor performance

“…Using the combination of these materials with some proper electrode materials can improve the performance of supercapacitors. TMN-based supercapacitors such as TiN mostly suffer from poor cycling life and especially low power density (Achour et al 2015) which need to be modified by the help of high power density materials like VACNTs. For example, there is a report on using the combined structure of CNT/TiN for the fabrication of high-performance supercapacitor electrodes (Achour et al 2014a).…”

“…For example, there is a report on using the combined structure of CNT/TiN for the fabrication of high-performance supercapacitor electrodes (Achour et al 2014a). In addition, it is shown that TiN films with controlled porosity on silicon substrates can result in a superior volumetric capacitance for TiN-based supercapacitors as high as 146.4 F cm -3 in the mild neutral electrolyte of potassium sulphate (Achour et al 2015). The volumetric mass density of TiN is 5.22 g cm -3 , so the gravimetric capacitance of this TiN supercapacitor is around 28 F g -1 which is approximately equal to VACNT-specific capacitance (Zhang et al 2008a) In addition to the importance of proper material selection on the supercapacitance performance, it is shown that doping of the considered material with different dopants or even different doping processes can have a significant effect on the electrodes electrochemical properties (Achour et al 2014b).…”

“…This is while the vacancy and interstitial defects in the doped materials which are created during electrodes preparation process play a major role in the cycling stability of the electrodes. For example, it is shown that the oxygen vacancies that are formed in TiO 2 as a result of nitrogen doping have a significant effect in the charge storage mechanism in these films (Achour et al 2015). These defects are supposed to be healed by O or OH adsorption during the potential cycling in the aqueous solution (Achour et al 2014a).…”

Sputtered Titanium Nitride Films on Titanium Foam Substrates as Electrodes for High‐Power Electrochemical Capacitors

“…The current of the CV was found to be significantly increased after replacing the neutral electrolyte with the acidic or the basic electrolytes. By plotting the scan rate versus specific capacitance, it can be clearly seen that the prepared electrode achieved 10.3 F g −1 (2.9 mF cm −2 ) in 1 M Na 2 SO 4 , 38.8 F g −1 (10.9 mF cm −2 ) in 1 M H 2 SO 4 and 28.5 F g −1 (8 mF cm −2 ) in 3 M KOH at 0.1 V s −1 (Figure b), which are of the same magnitude as other TiN electrodes in three‐electrode systems ,,,. The obtained values were also consistent with the galvanostatic charge and discharge (GCD) tests (Fig.…”

“…Recently, titanium nitride (TiN) has garnered attention in energy storage applications due to its superior electrical conductivity (∼4000 to 5500 S cm −1 ), excellent chemical stability,, and decent processability due to its mechanical strength . Some studies have reported an outstanding cycling stability (10,000 cycles without capacitance fading) of TiN ,. These findings are, however, contradictory to the studies that claimed poor stability of TiN (28 % capacitance retention after 400 cycles),, presumably due to different electrolytes and quality of electrode materials, which are worth exploring.…”