Catalytically Active Site Identification of Molybdenum Disulfide as Gas Cathode in a Nonaqueous Li–CO2 Battery
| Autor: | Ru-Shi Liu, Lichang Yin, Chung-Li Dong, Chih-Sheng Huang, Wen-Sheng Chang, Fu-Ming Wang, Chih Jung Chen, Ching-Chen Wu, Xing-Chun Wang, Yu-Cheng Huang |
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| Rok vydání: | 2021 |
| Předmět: |
Battery (electricity)
Materials science 02 engineering and technology Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Energy storage Cathode 0104 chemical sciences law.invention chemistry.chemical_compound Adsorption chemistry Chemical engineering law General Materials Science 0210 nano-technology Molybdenum disulfide Faraday efficiency |
| Zdroj: | ACS Applied Materials & Interfaces. 13:6156-6167 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.0c17942 |
| Popis: | Li-CO2 batteries have recently attracted attention as promising candidates for next-generation energy storage devices due to their extremely high theoretical energy density. The real application of Li-CO2 cells involves addressing several drawbacks, including high charging potential, poor coulombic efficiency, and low rechargeability. Molybdenum disulfide supported on carbon nanotubes (MoS2/CNT) with various ratios functioned as a cathode catalyst for Li-CO2 batteries. The optimal MoS2/CNT composite achieved a maximum discharge capacity of 8551 mAh g-1 with a coulombic efficiency of 96.7%. This hybrid also obtained an initial charging plateau of 3.87 V at a current density of 100 mA g-1 with a cutoff capacity of 500 mAh g-1. It provided ideal electrochemical stability of 142 cycles at the current densities of 100 mA g-1, which was comparable with that of some precious metal catalysts. This optimized MoS2/CNT was also cycled at 200 and 400 mA g-1 for 112 and 55 times, respectively. Density functional theory calculations demonstrated that the sulfided Mo-edge (s-Mo-edge) on MoS2 materials showed appropriate adsorption strengths of Li, CO2, and Li2CO3. Moreover, joint results of Raman profiles and extended X-ray absorption fine structure spectra elucidated that the catalytic efficiencies of MoS2/CNT hybrids were proportional to the quantities of exposed s-Mo-edge active sites. |
| Databáze: | OpenAIRE |
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