Binder‐Free MoN Nanofibers Catalysts for Flexible 2‐Electron Oxalate‐Based Li‐CO2 Batteries with High Energy Efficiency. (25th February 2022)

• Record Type: Journal Article
• Authors: Qi, Guicai; Zhang, Junxiang; Chen, Lin; Wang, Bin; Cheng, Jianli
• Is Part Of: Advanced functional materials. Volume 32:Number 22(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-25
• Subjects: 2‐electron reaction -- flexible electrodes -- high energy efficiency -- MoN -- oxalate‐based Li–CO 2 batteries; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202112501
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Owing to the ultrahigh theoretical energy density and environmental friendliness of CO2 fixation, Li‐CO2 batteries are regarded as one of sustainable high‐energy‐density power sources for different applications including wearable electronics. Most of reported Li‐CO2 batteries utilize expensive, noble metal‐based catalysts via 4‐electron Li2 CO3 as discharged products, leading to low energy efficiency, electrolyte side‐reaction, and sluggish reaction kinetics. Herein, a 2‐electron Li‐CO2 battery based on noble metal‐free and binder‐free MoN nanofibers on carbon cloth is fabricated with high energy efficiency and fast reaction kinetics. The fabricated batteries exhibit an initial median charge potential of low to 3.19 V with a potential gap of 0.36 V, high energy efficiency up to 88%, and > 500 h cycle stability. Experimental and theoretical computation results demonstrate that Li2 C2 O4 as 2‐electron intermediate products are stabilized by delocalized electrons of Mo 3+ in MoN to form the Mo–O coupling bridge, leading to reversible Li2 C2 O4 formation/decomposition accompanied with high energy efficiency and fast battery reaction. The batteries also show superior flexibility and stable power output under different deformations. Abstract : Noble metal‐free and binder‐free MoN nanofibers on carbon cloth are fabricated for 2‐electron oxalate‐based flexible Li–CO2 batteries. The assembled Li‐CO2 batteries exhibit a median charge potential of low to 3.19 V with a potential gap of 0.36 V, high energy efficiency over 88%, and >500 h cycle stability.