Inside-out regulation of MnO toward fast reaction kinetics in aqueous zinc ion batteries.

An "inside-out regulation" strategy is proposed to improve the Zn 2+ storage of MnO by Ni doping into the lattice and graphene wrapping outside the nanoparticles. The as-prepared Ni-MnO@rGO exhibits 112 mA h g -1 at 2.0 A g -1 over 800 cycles, due to the improved transport of electrons and ions from the synergistical function of intrinsic doping and external graphene encapsulation.