Low-carbon Technology and Chemical Reaction Engineering Lab;
College of Chemical Engineering;
Sichuan University;
Chengdu 610065;
China;
College of Architecture and Environment;
Sichuan University;
Chengdu 610065;
China;
Ultrasmall Fe_(2)O_(3)nanoparticles; Doping; Flame synthesis; Flexible supercapacitor; DFT calculations;