Abstract
In this paper, we report a one-step electro-deposited synthesis strategy for directly growing NiCoSe2/Ni3Se2 lamella arrays (LAs) on N-doped graphene nanotubes (N-GNTs) as advanced free-standing positive electrode for asymmetric supercapacitors. Benefiting from the synergetic contribution between the distinctive electroactive materials and the skeletons, the as-constructed N-GNTs@NiCoSe2/Ni3-Se2 LAs present a specific capacitance of ∼1308 F g−1 at a current density of 1 A g−1. More importantly, the hybrid electrode also reveals excellent rate capability (∼1000 F g−1 even at 100 A g−1) and appealing cycling performance (∼103.2% of capacitance retention over 10,000 cycles). Furthermore, an asymmetric supercapacitor is fabricated by using the obtained N-GNTs@NiCoSe2/Ni3Se2 LAs and active carbon (AC) as the positive and negative electrodes respectively, which holds a high energy density of 42.8 W h kg−1 at 2.6 kW kg−1, and superior cycling stability of ∼94.4% retention over 10,000 cycles. Accordingly, our fabrication technique and new insight herein can both widen design strategy of multicomponent composite electrode materials and promote the practical applications of the latest emerging transition metal selenides in next-generation high performance supercapacitors.
摘要
本文采用一步电沉积法在N掺杂石墨烯纳米管(N-GNTs)上直接生长NiCoSe2/Ni3Se2片层状阵列(NiCoSe2/Ni3Se2-LAs), 并将其作为非对称超级电容器的正极材料. 由于活性材料和骨架之间的 协同作用, 在电流密度为1 A g −1 的情况下, 构建出的N-GNT@Ni-CoSe2/NiSe2Las呈现出约1308 F g −1 的质量比电容. 更重要的是, 此 复合电极材料还显示出优异的倍率性能 (100 A g−1 下的比电容约为 1000 F g−1) 和超长的循环稳定性 (10000次循环后其比电容仍保持为原比电容的∼103.2%). 此外, 以N-GNTs@NiSe2/Ni3Se2-LAs活性炭(AC) 分别为正极和负极组装了一种非对称的超级电容器, 其在2.6 kW kg−1下的能量密度为42.8 W h kg−1, 且具有突出的循环 稳定性(10000次循环后其比电容仍保持为原比电容的∼94.4%). 和因此, 我们的制备技术和新的见解不仅能拓宽多组分复合电极材料的设计, 而且还能促进新型过渡金属硒化物在新一代高性能超级电容器中的实际应用.
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Acknowledgements
The work was supported by the National Natural Science Foundation of China (51672144, 51572137 and 51702181), the Natural Science Foundation of Shandong Province (ZR2017BB013 and ZR2019BEM042), Higher Educational Science and Technology Program of Shandong Province (J17KA014, J18KA001 and J18KA033), Taishan Scholars Program of Shandong Province (ts201511034), and Overseas Taishan Scholars Program.
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Meng A, Zhao J and Li Z designed the project and the experiments. Shen T and Huang T performed the experiments. Song G and Tan S performed the products characterizations. Meng A wrote the paper with support from Zhao J and Li Z. All authors contributed to the general discussion.
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The authors declare no conflict of interest.
Alan Meng is a professor in the College of Chemistry and Molecular Engineering at Qingdao University of Science & Technology. Her main research interest is on the development of new electrode nanomaterials for energy storage devices including supercapacitors and batteries.
Jian Zhao received his PhD degree from Qingdao University of Science & Technology in 2017. His research interests include the synthesis, characterization, electrochemical performances and mechanism of electrode materials for supercapacitors.
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NiCoSe2/Ni3Se2 lamella arrays grown on N-doped graphene nanotubes with ultrahigh-rate capability and long-term cycling for asymmetric supercapacitor
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Meng, A., Shen, T., Huang, T. et al. NiCoSe2/Ni3Se2 lamella arrays grown on N-doped graphene nanotubes with ultrahigh-rate capability and long-term cycling for asymmetric supercapacitor. Sci. China Mater. 63, 229–239 (2020). https://doi.org/10.1007/s40843-019-9587-5
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DOI: https://doi.org/10.1007/s40843-019-9587-5