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Two-dimensional siloxene nanosheets: novel high-performance supercapacitor electrode materials†
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2018-04-04 00:00:00 , DOI: 10.1039/c8ee00160j Karthikeyan Krishnamoorthy 1, 2, 3, 4 , Parthiban Pazhamalai 1, 2, 3, 4 , Sang-Jae Kim 1, 2, 3, 4, 5
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2018-04-04 00:00:00 , DOI: 10.1039/c8ee00160j Karthikeyan Krishnamoorthy 1, 2, 3, 4 , Parthiban Pazhamalai 1, 2, 3, 4 , Sang-Jae Kim 1, 2, 3, 4, 5
Affiliation
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Silicon-based materials have attracted considerable interest for the development of energy storage devices because of their ease of integration with the existing silicon semiconductor technology. Herein, we have prepared siloxene sheets—a two-dimensional (2D) silicon material—and investigated their energy storage properties via fabrication of a symmetric supercapacitor (SSC) device containing 0.5 M tetraethylammonium tetrafluoroborate as the electrolyte. The formation of 2D siloxene sheets functionalized with oxygen, hydrogen, and hydroxyl groups was confirmed through X-ray diffraction, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and laser Raman mapping analyses. Cyclic voltammetric studies of the siloxene SSC device revealed the presence of pseudocapacitance in the siloxene sheets that arose from an intercalation/deintercalation phenomenon. The galvanostatic charge–discharge profiles of the device displayed sloped symmetric triangular curves with a maximum specific capacitance of 2.18 mF cm−2, high energy density of 9.82 mJ cm−2, good rate capability, and excellent cycling stability of 98% capacitance retention after 10 000 cycles. The siloxene SSC device delivered a maximum power density of 272.5 mW cm−2, which is higher than those of other silicon- and carbon-based SSCs, highlighting their potential for application in energy storage.
中文翻译：
二维硅氧烷纳米片：新型高性能超级电容器电极材料†
由于硅基材料易于与现有的硅半导体技术集成，因此它们对储能设备的开发引起了极大的兴趣。在此，我们准备了二维（2D）硅材料的硅氧烷片材，并通过以下方法研究了它们的储能性能含有0.5M四氟硼酸四乙铵作为电解质的对称超级电容器（SSC）器件的制造。通过X射线衍射，X射线光电子能谱，高分辨率透射电子显微镜和激光拉曼作图分析，证实了被氧，氢和羟基官能化的2D硅氧烷片材的形成。对硅氧烷SSC装置进行的循环伏安研究表明，硅氧烷金属片中存在假电容，这是由插层/脱嵌现象引起的。器件的恒电流充放电曲线显示出倾斜的对称三角曲线，最大比电容为2.18 mF cm -2，高能量密度为9.82 mJ cm -2，良好的倍率能力和出色的循环稳定性（10000次循环后可保持98％的电容）。硅氧烷SSC装置提供的最大功率密度为272.5 mW cm -2，比其他基于硅和碳的SSC的功率密度更高，从而突出了其在能量存储中的潜力。
更新日期：2018-04-04
中文翻译：
二维硅氧烷纳米片：新型高性能超级电容器电极材料†
由于硅基材料易于与现有的硅半导体技术集成，因此它们对储能设备的开发引起了极大的兴趣。在此，我们准备了二维（2D）硅材料的硅氧烷片材，并通过以下方法研究了它们的储能性能含有0.5M四氟硼酸四乙铵作为电解质的对称超级电容器（SSC）器件的制造。通过X射线衍射，X射线光电子能谱，高分辨率透射电子显微镜和激光拉曼作图分析，证实了被氧，氢和羟基官能化的2D硅氧烷片材的形成。对硅氧烷SSC装置进行的循环伏安研究表明，硅氧烷金属片中存在假电容，这是由插层/脱嵌现象引起的。器件的恒电流充放电曲线显示出倾斜的对称三角曲线，最大比电容为2.18 mF cm -2，高能量密度为9.82 mJ cm -2，良好的倍率能力和出色的循环稳定性（10000次循环后可保持98％的电容）。硅氧烷SSC装置提供的最大功率密度为272.5 mW cm -2，比其他基于硅和碳的SSC的功率密度更高，从而突出了其在能量存储中的潜力。
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