Abstract
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.
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