Facile fabrication of Ni, Fe-doped δ-MnO 2 derived from Prussian blue analogues as an efficient catalyst for stable Li–CO 2 batteries

Ni, Fe co-doped δ-MnO 2 nanoflowers (Ni–Fe-δ-MnO 2 ) as a cathode for Li–CO 2 batteries are obtained using Prussian blue as the self-sacrificial template, which is beneficial for the reduction and evolution of CO 2 .