FeMnO3 porous nanocubes/Mn2O3 nanotubes hybrids derived from Mn-3[Fe(CN)(6)](2)center dot nH(2)O Prussian Blue Analogues as an anode material for lithium-ion batteries

FeMnO3/Mn2O3 hybrids were prepared by calcinating the Mn-3[Fe(CN)(6)](2)center dot nH(2)O Prussian Blue Analogues (PBAs) precursor, which involving a room-temperature precipitation of Mn2+ and K3Fe(CN)(6) with or without citric acid as additives. The as-prepared FeMnO3 inherits the morphology of PBAs and shows a porous structure due to releasing of CO2 and NO2 gases in the calcination process in air. FeMnO3 nanocubes fulling of larger pores mixed with a new morphology of Mn2O3 nanotubes are formed due to the assistance of citric acid (Sample FexMn2-xO3-C). While the single morphology of FeMnO3 and Mn2O3 nanocubes are obtained without citric acid (Sample FexMn2-xO3). The FexMn2-xO3-C anode exhibits super Li+ storage performance than that of FexMn2-xO3 anode, such as higher initial discharge/charge capacities of 1580 and 850 mAh g(-1), and maintain 995 mAh g(-1) until 170 cycles at a current density of 200 mA g(-1). The enhanced electrochemical performance is attributed to the inter-connected porous structure and large amount of mesopores of FeMnO3 nanocubes and Mn2O3 nanotubes, which effectively improved structure stability, reduced the diffusion length of lithium ions and electrons, increased the diffusion coefficient of Li+ ion throughout the electrode, and buffered volume expansion during the Li+ insertion/extraction processes. These results indicate that the porous FeMnO3 nanocubes/Mn2O3 nanotubes hybrids can be a promising anode material for high-performance LIBs. (C) 2018 Elsevier B.V. All rights reserved.