xO y/MnO 2 nanoarrays and Ti substrate: Towards flexible supercapacitors with high energy density and long service life]]>

摘要

AbstractWeak adhesion between anodic TiO2nanotube arrays (TNTAs) and Ti substrate is a nonnegligible obstacle for the preparation of long TNTAs and greatly limits its practical application. The TiNxOynanoarrays prepared from TNTAs by a high-temperature nitridation process also suffer this defect. In this work, a compact layer (~ 140nm in thickness) was introduced into the bottom of TNTAsviaan additional anodization, resulting in firm binding between the Ti substrate and TNTAs. Owing to the strong adhesion, overlong TiNxOynanoarrays up to 29.8μm without curling can be obtained. Notably, the TiNxOynanoarrays with average lengths of ~ 22.8μm depict an extraordinary specific capacitance of 550.8mFcm?2at 0.5mAcm?2in 1.0M H2SO4, which is the highest value of TiNxOynanoarrays as reported so far. Moreover, TiNxOy/MnO2, TiNxOy/Co-S and TiNxOy/MoS2nanoarrays were obtained. The loaded thin MnO2layer presents a superior specific capacitance of 1404.4Fg?1at 0.5Ag?1(95.5mFcm?2at 0.5mFcm