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Core–shell structures of Cu2O constructed by carbon quantum dots as high-performance zinc-ion battery cathodes
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2023-10-25 , DOI: 10.1039/d3ta05705d Qu Zhang 1 , Penggao Liu 1 , Tao Wang 1, 2 , Qian Liu 1 , Dongling Wu 1
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2023-10-25 , DOI: 10.1039/d3ta05705d Qu Zhang 1 , Penggao Liu 1 , Tao Wang 1, 2 , Qian Liu 1 , Dongling Wu 1
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The practical capacity of conversion-type Cu-based materials is low and the structural instability usually results in poor capacity retention and rate performance. Carbon quantum dots (CDs) composites are an effective way to overcome the above-mentioned shortcomings. Herein, a core–shell architecture self-assembled by CDs and Cu2O was well engineered. Such a unique construction efficiently integrates the advantages of CDs and the functional cladding interface. The constrain effect of the CDs shell effectively limits the collapse of the structure and the dissolution of active substances in Cu2O, and improves the phase transformation reaction and reaction kinetics of the composite. Theoretical calculations show that CDs reduce the ion diffusion energy barrier and improve the electrical conductivity of Cu2O. In particular, the optimized Cu2O-CDs-20 provides a high capacity of 425 mA h g−1 at 0.1 A g−1 (only 260 mA h g−1 for pure Cu2O) as the cathode for aqueous zinc ion batteries (AZIBs) and shows superior cycling stability and rate performance. The excellent performance of the composite should be contributed to the CDs modification and the conversion-type zinc storage mechanism of Cu2O as confirmed by in situ XRD, in situ Raman spectroscopy and electrochemical characterizations.
中文翻译：
碳量子点构建的Cu2O核壳结构作为高性能锌离子电池正极
转化型铜基材料的实际容量较低，结构不稳定通常导致容量保持率和倍率性能较差。碳量子点（CD）复合材料是克服上述缺点的有效途径。在此，我们精心设计了由CD和Cu 2 O自组装的核壳结构。这种独特的结构有效地结合了CD和功能包层界面的优点。CDs壳层的约束作用有效限制了Cu 2 O中结构的塌陷和活性物质的溶解，改善了复合材料的相变反应和反应动力学。理论计算表明，CDs降低了离子扩散能垒，提高了Cu 2 O的电导率。特别是，优化后的Cu 2 O-CDs-20在0.1 A g -1下提供了425 mA hg -1的高容量（仅260 mA hg -1的纯Cu 2 O）作为水性锌离子电池（AZIB）的阴极，并表现出优异的循环稳定性和倍率性能。原位XRD、原位拉曼光谱和电化学表征证实了复合材料优异的性能应归功于CDs修饰和Cu 2 O的转化型储锌机制。
更新日期：2023-10-25
中文翻译：
碳量子点构建的Cu2O核壳结构作为高性能锌离子电池正极
转化型铜基材料的实际容量较低，结构不稳定通常导致容量保持率和倍率性能较差。碳量子点（CD）复合材料是克服上述缺点的有效途径。在此，我们精心设计了由CD和Cu 2 O自组装的核壳结构。这种独特的结构有效地结合了CD和功能包层界面的优点。CDs壳层的约束作用有效限制了Cu 2 O中结构的塌陷和活性物质的溶解，改善了复合材料的相变反应和反应动力学。理论计算表明，CDs降低了离子扩散能垒，提高了Cu 2 O的电导率。特别是，优化后的Cu 2 O-CDs-20在0.1 A g -1下提供了425 mA hg -1的高容量（仅260 mA hg -1的纯Cu 2 O）作为水性锌离子电池（AZIB）的阴极，并表现出优异的循环稳定性和倍率性能。原位XRD、原位拉曼光谱和电化学表征证实了复合材料优异的性能应归功于CDs修饰和Cu 2 O的转化型储锌机制。
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