Abstract
For the first time, cotton fiber-shaped Cu2O nanoparticles were prepared onto the surface of a commercial copper (Cu) foil via a very simple immersion method at room temperature in which the soaking solution only contained CuSO4, Na2S2O3, and a very little amount of 1-butyl-3-methylimidazolium trifluoroacetate. In this work, the current collectors prepared using 1 mM, 2 mM, and 3 mM Na2S2O3 were, respectively, nominated as current collectors a, b, and c. Interestingly, a cotton fiber-shaped spatial network structure assembled by a large number of 10-nm-sized nanoparticles was presented on the surface of current collector b. The initial discharge capacity (DC) at 0.1 A g−1 of electrode b, namely, the graphite electrode assembled using current collector b, was as high as 467 mAh g−1, almost 1.65 times larger than that of the conventional graphite electrode. Particularly, at 0.5 A g−1 after 10 cycles, the DC value of electrode b (105 mAh g−1) was still about 1.8 times higher than that of the conventional graphite electrode (59 mAh g−1). An immersion method for preparing Cu2O-modified Cu foil at room temperature is developed in this work, which is very meaningful to the development of the Cu foil-based commercial graphite electrode, since no additional energy consumptions and no variations of the electrode preparation process are required.
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Acknowledgements
This work was supported by the Ministry of Science and Technology of China (No. 2019YFE0100200 and 2019YFA0705703), the National Natural Science Foundation of China (No. U1564205), and Research on the Evaluation of Battery Thermal Safety for New Energy Passenger Vehicle (Grant No. 2019ZZ13), and the Technical Innovation Advanced Research Foundation of Hebei Normal University (Grant No. L2018K03).
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Ding, K., Zhang, D., Jiang, L. et al. An ionic liquid-present immersion method for preparing cotton fiber-shaped Cu2O nanoparticles at room temperature. J Appl Electrochem 52, 55–65 (2022). https://doi.org/10.1007/s10800-021-01614-5
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DOI: https://doi.org/10.1007/s10800-021-01614-5