Three-in-one Fe-porphyrin based hybrid nanosheets for enhanced CO2 reduction and evolution kinetics in Li-CO2 battery

• Published in: Chinese chemical letters 2023-06, Vol.34 (6), p.107633-475, Article 107633
• Main Authors: Li, Shan, Wang, Jian-Hui, Dong, Long-Zhang, Zhang, Yu, Yao, Xiao-Man, Chen, Yifa, Li, Shun-Li, Lan, Ya-Qian
• Format: Article
• Language: English
• Subjects: Cathode catalyst; Li-CO2 battery; Porphyrin; Ru nanoparticles; Single-metal sites
• ISSN: 1001-8417; 1878-5964
• DOI: 10.1016/j.cclet.2022.06.056

Efficient cathode-catalysts with multi-functional properties are essential for Li-CO2 battery, while the construction of them with simultaneously enhanced CO2 reduction and evolution kinetics is still challenging. Here, a kind of hybrid nanosheets based on Ru nanoparticles, Fe-TAPP and grapheme oxide (GO) has been designed through a one-pot self-assembly strategy. The Ru, Fe-porphyrin and GO based hybrid nanosheets (denoted as Ru/Fe-TAPP@GO) with integrated multi-components offer characteristics of ultrathin thickness (∼4 nm), high electro-redox property, uniformly dispersed morphology, and high electrical conductivity, etc. These features endow Ru/Fe-TAPP@GO with ultra-low overpotential (0.82 V) and fully reversible discharge/charge property with a high specific-capacity of 39,000 mAh/g within 2.0–4.5 V at 100 mA/g, which are much superior to Ru@GO and Fe-TAPP@GO. The achieved performance was presented as one of the best cathode-catalysts reported to date. The synergistically enhanced activity originated from the integrated hybrid nanosheets may provide a new pathway for designing efficient cathode-catalysts for Li-CO2 batteries. A kind of Ru/Fe-TAPP@GO hybrid nanosheets has been prepared through a one-pot reflux method and successfully applied as efficient cathode catalyst for high-performance Li-CO2 battery. [Display omitted]