Key Laboratory of Materials Physics;
Centre for Environmental and Energy Nanomaterials;
Anhui Key Laboratory of Nanomaterials and Nanotechnology;
Institute of Solid State Physics;
Chinese Academy of Sciences;
Hefei 230031;
China;
University of Science and Technology of China;
Hefei 230026;
China;
Niobium oxide(Nb_(2)O_(5)); Nitrogen(N_(2))reduction reaction(NRR); Electrochromism; Oxygen vacancies; Phase transformation;