Capacitive performance of molybdenum nitride/titanium nitride nanotube array for supercapacitor

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2017-01, Vol.215, p.64-70
• Main Authors: Xie, Yibing, Tian, Fang
• Format: Article
• Language: English
• Subjects: Ammonia; Capacitance; Electric double layer; Electrodes; Lithium; Molybdenum; Molybdenum nitride; Nanoparticles; Nanotube array; Supercapacitor; Supercapacitors; Titanium nitride; Titanium oxides
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2016.11.005

•MoNx/TiN NTA is fully converted from MoO2/TiO2 NTA by one-step nitridation process.•MoNx/TiN NTA is used as feasible electrode material of high-performance supercapacitor.•MoNx/TiN NTA shows high capacitance, rate capability and cycling stability. Molybdenum nitride (MoNx) depositing on titanium nitride nanotube array (TiN NTA) was designed as MoNx/TiN NTA for supercapacitor electrode material. MoNx/TiN NTA was fabricated by electrodepositing molybdenum oxide onto titanium dioxide NTA and one-step nitridation treatment in ammonia. MoNx/TiN NTA involved top-surface layer of MoNx nanoparticles and underlying layer of TiN NTA, which contributed to electric double layer capacitance in aqueous lithium-ion electrolyte solution. The specific capacitance was increased from 69.05mFcm−2 for TiN NTA to 121.50mFcm−2 for MoNx/TiN NTA at 0.3mAcm−2, presenting the improved capacitance performance. MoNx exhibited the capacitance of 174.83Fg−1 at 1.5Ag−1 and slightly declined to 109.13Fg−1 at 30Ag−1, presenting high rate capability. MoNx/TiN NTA exhibited the capacitance retention ratio of 93.8% at 3.0mAcm−2 after 1000 cycles, presenting high cycling stability. MoNx/TiN NTA could act as a promising electrode material of supercapacitor.