| Citation: |
Jun Wang, Yanjie Zhai, Feng Dang, Lanling Zhao, Qing Xia, et al. Iridium-Decorated Carbon Nanotubes as Cathode Catalysts for Li-CO2 Batteries with a Highly Efficient Direct Li2CO3 Formation/Decomposition Capability. Materials Lab 2022, 1, 220010. doi: 10.54227/mlab.20220010
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Iridium-Decorated Carbon Nanotubes as Cathode Catalysts for Li-CO2 Batteries with a Highly Efficient Direct Li2CO3 Formation/Decomposition Capability
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Abstract
Rechargeable Li-CO2 batteries are regarded as the ideal application for the superior energy storage technology. However, they still limited by the lack of high efficiency electrocatalyst and limited understanding for the electrochemical reaction mechanism. In this work, we prepared the Ir-CNT composite by a rotation hydrothermal method, which remarkably promoted the reaction kinetics and enhanced the electrocatalytic performance of Li-CO2 batteries. The incorporation of Ir nanoparticles shows high activity enhancement for the adsorption of Li2CO3 species, which was confirmed by density functional theory (DFT) calculations. The Ir-CNT cathode exhibited an excellent ability to catalyze the formation and decomposition of Li2CO3 during cycling. Therefore, a large specific capacity of
10325.9 mAh g−1 and an excellent high rate cyclability with stably over 100 cycles were achieved. The three-dimensional Ir-CNT cathode could spontaneously advance the electrocatalytic activity of CO2 oxidation and precipitation to increase specific capacities and cycle life, significantly boosting the practical application of Li-CO2 batteries.-
Keywords:
- Li-CO2 Batteries /
- Electrocatalysis /
- Cathode Catalyst /
- Ir-CNT Composite /
- DFT Calculations
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References
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Jun Wang, Yanjie Zhai, Feng Dang, Lanling Zhao, Qing Xia, et al. Iridium-Decorated Carbon Nanotubes as Cathode Catalysts for Li-CO2 Batteries with a Highly Efficient Direct Li2CO3 Formation/Decomposition Capability. Materials Lab 2022, 1, 220010. doi: 10.54227/mlab.20220010
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Figure 1.
Schematic representation of preparing Ir-CNT composite.
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Figure 2.
(a,b) TEM images with (c) SAED pattern and (d) SEM image with EDS element mapping images of (e) Ir and (f) C elements of the Ir-CNT composite.
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Figure 3.
(a) XRD, high-resolution (b) Ir 4f XPS spectra, (c) TGA and (d) Raman data of Ir-CNT composite.
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Figure 4.
(a) Initial discharge/charge profiles at 100 mAh g−1 and (c) CV curves of CNT and Ir-CNT cathodes; (b) rate capability of Ir-CNT cathodes at 100, 200 and 400 mAh g−1; (f) cycling performance with typical discharge/charge profiles of (d) CNT and (e) Ir-CNT cathodes with a fixed capacity of
1000 mAh g−1 at 100 mAh g−1. -
Figure 5.
Ex-situ FESEM images of Ir-CNT cathodes at (a) 1st discharging, (b) 1st charging and (c) 100th charging stage; (e) ex-situ TEM image and corresponding (f) SAED pattern at 1st discharging; (d) XRD data of Ir-CNT cathodes at different stages; (g, h) comparison of adsorption energy between Li2C2O4 and Li2CO3 monomer on Ir (111).
