A well-defined dual Mn-site based metal-organic framework to promote CO2 reduction/evolution in Li-CO2 batteries

A series of Li-CO2 battery cathode materials are reported based on metal-organic frameworks with dual-metal sites containing a metalloporphyrin and a metal-coordinated pyrazole. MnTPzP-Mn demonstrates a low voltage hysteresis of 1.05 V at 100 mA g(-1 )and good stability of 90 cycles at 200 mA g(-1). Among them, the Mn-coordinated pyrazole site can promote the effective decomposition of Li2CO3, and the Mn-metalloporphyrin site contributes to the activation of CO2. This is the first example of using a crystalline cathode material with a well-defined structure to reveal natural catalytic sites for CO2 reduction/evolution reactions under aprotic conditions in Li-CO2 batteries.

Automated summary

A series of Li-CO2 battery cathode materials based on metal-organic frameworks with dual-metal sites have been reported, showing that Mn-coordinated pyrazole site promotes effective decomposition of Li2CO3, while Mn-metalloporphyrin site contributes to the activation of CO2. This study reveals natural catalytic sites for CO2 reduction/evolution reactions in Li-CO2 batteries using a crystalline cathode material with a well-defined structure under aprotic conditions.