Molecular tailoring of MnO2 by bismuth doping to achieve aqueous zinc-ion battery with capacitor-level durability

•Bismuth-doped α-MnO2 was prepared successfully via combining facile redox reaction at room temperature and annealing treatment.•The doping of bismuth can ameliorate the electrical conductivity and improve the structural stability of α-MnO2.•Bismuth-doped α-MnO2 cathode delivers amazing cycle stability and other satisfactory electrochemical performance.•The assembled flexible aqueous ZIBs possess satisfactory electrochemical performance under different deformation circumstances and can power multiple electronic devices.