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

Rechargeable Li-CO2 batteries are regarded as an ideal new-generation energy storage system, owing to their high energy density and extraordinary CO2 capture capability. Developing a suitable cathode to improve the electrochemical performance of Li-CO2 batteries has always been a research hotspot. Herein, Ni-Fe-δ-MnO2 nano-flower composites are designed and synthesized by in situ etching a Ni-Fe PBA precursor as the cathode for Li-CO2 batteries. Ni-Fe-δ-MnO2 nanoflowers composed of ultra-thin nanosheets possess considerable surface spaces, which can not only provide abundant catalytic active sites, but also facilitate the nucleation of discharge products and promote the CO2 reduction reaction. On the one hand, the introduction of Ni and Fe elements can improve the electrical conductivity of δ-MnO2. On the other hand, the synergistic catalytic effect between Ni, Fe elements and δ-MnO2 will greatly enhance the cycling performance and reduce the overpotential of Li-CO2 batteries. Consequently, the Li-CO2 battery based on the Ni-Fe-δ-MnO2 cathode shows a high discharge capacity of 8287 mA h g-1 and can stabilize over 100 cycles at a current density of 100 mA g-1. The work offers a promising guideline to design efficient manganese-based catalysts for Li-CO2 batteries.

Chen X ，Chen J ，Qiao Y ，Gao Y ，Fan S ，Liu Y ，Li L ，Liu Y ，Chou S ... -  《-》

Advanced Li/Na-CO(2) Batteries Enabled by the γ-MnO(2) Catalyst with Enhanced Carbonate Decomposition.

Chen X ，Chen J ，Liu Y ，Liu Y ，Gao Y ，Fan S ，He X ，Liu X ，Shen C ，Jiang Y ，Li L ，Qiao Y ，Chou S ... -  《-》

Synthesis of hierarchical porous δ-MnO2 nanoboxes as an efficient catalyst for rechargeable Li-O2 batteries.

Zhang J ，Luan Y ，Lyu Z ，Wang L ，Xu L ，Yuan K ，Pan F ，Lai M ，Liu Z ，Chen W ... -  《-》

Facile Synthesis of Birnessite δ-MnO(2) and Carbon Nanotube Composites as Effective Catalysts for Li-CO(2) Batteries.

Liu Q ，Hu Z ，Li L ，Li W ，Zou C ，Jin H ，Wang S ，Chou SL ... -  《-》

Prussian blue analogs derived Fe-Ni-P@nitrogen-doped carbon composites as sulfur host for high-performance lithium-sulfur batteries.

Lithium-sulfur (Li-S) batteries have drawn a lot of attention owing to the high theoretical capacity of 1675 mAh g-1, environmental friendliness and relative abundance of sulfur. Nevertheless, the severe dissolution and migration of lithium polysulfides (LiPSs) and poor conductivity of sulfur greatly hinder the practical application of Li-S batteries. In this work, Fe-Ni-P@nitrogen-doped carbon (named as Fe-Ni-P@NC) derived from Fe-Ni Prussian blue analog (Fe-Ni PBA) was used as highly efficient sulfur host for Li-S batteries. The Fe-Ni-P particles not only enhance the adsorption of LiPSs but also effectively promote the conversion of LiPSs. In addition, the CN- of PBAs can readily generate nitrogen-doped carbon during pyrolysis, which can improve the conductivity of composites. Due to these advantages, Li-S batteries using S@Fe-Ni-P@NC composites cathodes exhibited good electrochemical performance with outstanding rate capability and stable cycling over 500 cycles with a lower capacity fading rate of 0.08% per cycle at 1 C.

Song C ，Jin Q ，Zhang W ，Hu C ，Bakenov Z ，Zhao Y ... -  《-》