Supercapacitor Electrodes Based on Hierarchical Mesoporous MnO<i>_x</i>/Nitrided TiO₂ Nanorod Arrays on Carbon Fiber Paper

Metal nitride nanoarrays are attractive to electrochemical energy storage and in this work, hierarchical mesoporous manganese oxide (MnO x ) nanoflakes and nitrided TiO 2 nanorod arrays (NTNA) are prepared on carbon fiber paper (CFP) by hydrothermal synthesis and electrodeposition. The MnO x /NTNA/CFP electrode delivers outstanding electrochemical performance such as high areal capacitance of 327 mF cm −2 at a current density of 0.25 mA cm −2 and good cycling stability with 96% retention after 5000 cycles. Compared to the MnO x /TiO 2 /CFP and MnO x /CFP electrodes, the MnO x /NTNA/CFP electrode possesses better electrochemical properties such as higher areal capacitance, better electrochemical activity, and cycling life. The enhanced performance can be attributed to the nitrided TiO 2 nanorod arrays with higher conductivity offering low electrochemical impedance and fast ion/electron transfer. The MnO x /NTNA/CFP electrode is a promising candidate in high‐performance supercapacitor applications.