A Highly Reversible Long‐Life Li–CO2 Battery with a RuP2‐Based Catalytic Cathode

• Published in: Small (Weinheim an der Bergstrasse, Germany) Germany), 2019-07, Vol.15 (29), p.e1803246-n/a
• Main Authors: Guo, Ziyang, Li, Jinli, Qi, Haocheng, Sun, Xuemei, Li, Hongdong, Tamirat, Andebet Gedamu, Liu, Jie, Wang, Yonggang, Wang, Lei
• Format: Article
• Language: English
• Subjects: Carbon dioxide; Carbon sequestration; Catalysis; Catalysts; Catalytic activity; catalytic cathode; Cathodes; Electrical resistivity; Electrochemical analysis; Flux density; Li2CO3 decomposition; Melamine; N, P‐codoped carbon films; Nanoparticles; Nanotechnology; Phytic acid; Rechargeable batteries; rechargeable Li–CO2 batteries; RuP2 nanoparticles; Ruthenium compounds
• ISSN: 1613-6810; 1613-6829
• DOI: 10.1002/smll.201803246

Rechargeable Li–CO2 batteries have attracted worldwide attention due to the capability of CO2 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–CO2 batteries. Here, phytic acid (PA)‐cross‐linked ruthenium complexes and melamine are used as precursors to design and synthesize RuP2 nanoparticles highly dispersed on N, P dual‐doped carbon films (RuP2‐NPCFs), and the obtained RuP2‐NPCF is further applied as the catalytic cathode for Li–CO2 batteries. RuP2 nanoparticles that are uniformly deposited on the surface of NPCF show enhanced catalytic activity to decompose Li2CO3 at low charge overpotential. In addition, the NPCF its with porous structure in RuP2‐NPCF provides superior electrical conductivity, high electrochemical stability, and enough ion/electron and space for the reversible reaction in Li–CO2 batteries. Hence, the RuP2‐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 (