Pt Nanoparticles Confined in a 3D Porous FeNC Matrix as Efficient Catalysts for Rechargeable Li-CO2/O2 Batteries

Peng-Fang Zhang; Hong-Ying Zhuo; Yun-Yun Dong; Yao Zhou; Yun-Wu Li; Hong-Guo Hao; Da-Cheng Li; Wen-Jing Shi; Su-Yuan Zeng; Shu-Ling Xu; Xiang-Jin Kong; Yi-Jin Wu; Jin-Sheng Zhao; Shu Zhao; Jun-Tao Li

doi:10.1021/acsami.2c18857

Pt Nanoparticles Confined in a 3D Porous FeNC Matrix as Efficient Catalysts for Rechargeable Li-CO₂/O₂ Batteries

ACS Appl Mater Interfaces. 2023 Jan 18;15(2):2940-2950. doi: 10.1021/acsami.2c18857. Epub 2023 Jan 4.

Authors

Affiliations

¹ Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, and School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252000, P. R. China.
² Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China.
³ College of Energy, Xiamen University, Xiamen 361005, P. R. China.
⁴ Key Laboratory of Functional Metal-Organic Compounds of Hunan Province, Hunan Province Universities Key Laboratory of Functional Organometallic Materials, College of Chemistry and Material Science, Hengyang Normal University, Hengyang 421008, P. R. China.
⁵ Institute of Advanced Battery Materials and Devices, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, P. R. China.

PMID: 36598797
DOI: 10.1021/acsami.2c18857

Abstract

The cathodic product Li₂CO₃, due to its high decomposition potential, has hindered the practical application of rechargeable Li-CO₂/O₂ batteries. To overcome this bottleneck, a Pt/FeNC cathodic catalyst is fabricated by dispersing Pt nanoparticles (NPs) with a uniform size of 2.4 nm and 8.3 wt % loading amount into a porous microcube FeNC support for high-performance rechargeable Li-CO₂/O₂ batteries. The FeNC matrix is composed of numerous two-dimensional (2D) carbon nanosheets, which is derived from an Fe-doping zinc metal-organic framework (Zn-MOF). Importantly, using Pt/FeNC as the cathodic catalyst, the Li-CO₂/O₂ (V_CO₂/V_O₂ = 4:1) battery displays the lowest overpotential of 0.54 V and a long-term stability of 142 cycles, which is superior to batteries with FeNC (1.67 V, 47 cycles) and NC (1.87 V, 23 cycles) catalysts. The FeNC matrix and Pt NPs can exert a synergetic effect to decrease the decomposition potential of Li₂CO₃ and thus enhance the battery performance. In situ Fourier transform infrared (FTIR) spectroscopy further confirms that Li₂CO₃ can be completely decomposed under a low potential of 3.3 V using the Pt/FeNC catalyst. Impressively, Li₂CO₃ exhibits a film structure on the surface of the Pt/FeNC catalysts by scanning electron microscopy (SEM), and its size can be limited by the confined space between the carbon sheets in Pt/FeNC, which enlarges the better contacting interface. In addition, density functional theory (DFT) calculations reveal that the Pt and FeNC catalysts show a higher adsorption energy for Li₂CO₃ and Li₂CO₄ intermediates compared to the NC catalyst, and the possible discharge pathways are deeply investigated. The synergetic effect between the FeNC support and Pt active sites makes the Li-CO₂/O₂ battery achieve optimal performance.

Keywords: DFT calculations; Li-CO2/O2 battery; Pt/FeNC catalyst; in situ FTIR; porous FeNC matrix; size-confined.