A Highly Reversible Long-Life Li–CO 2 Battery with a RuP 2 -Based Catalytic Cathode
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Rechargeable Li–CO 2 batteries have attracted worldwide attention due to the capability of CO 2 capture and superhigh energy density. However, they still suffer from poor cycling performance and huge overpotential. Thus, it is essential to explore highly efficient catalysts to improve the electrochemical performance of Li–CO 2 batteries. Here, phytic acid (PA)-cross-linked ruthenium complexes and melamine are used as precursors to design and synthesize RuP 2 nanoparticles highly dispersed on N, P dual-doped carbon films (RuP 2 -NPCFs), and the obtained RuP 2 -NPCF is further applied as the catalytic cathode for Li–CO 2 batteries. RuP 2 nanoparticles that are uniformly deposited on the surface of NPCF show enhanced catalytic activity to decompose Li 2 CO 3 at low charge overpotential. In addition, the NPCF its with porous structure in RuP 2 -NPCF provides superior electrical conductivity, high electrochemical stability, and enough ion/electron and space for the reversible reaction in Li–CO 2 batteries. Hence, the RuP 2 -NPCF cathode delivers a superior reversible discharge capacity of 11951 mAh g −1 , and achieves excellent cyclability for more than 200 cycles with low overpotentials (<1.3 V) at the fixed capacity of 1000 mAh g −1 . This work paves a new way to design more effective catalysts for Li–CO 2 batteries.
Guo, Z; Li, J; Qi, H; Sun, X; Li, H; Tamirat, AG; Liu, J; Wang, Y; Wang, L
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