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Ultrahigh-rate and high-frequency MXene micro-supercapacitors for kHz ac line-filtering

Journal of Energy Chemistry 2022年第6期31卷 1-8,I0001页

作者： Xin Feng Sen Wang Pratteek Das Xiaoyu Shi Shuanghao Zheng Feng Zhou Jing Ning Dong Wang Jincheng Zhang Yue Hao Zhong-Shuai Wu Guangzhou Wide Bandgap Semiconductor Innovation Center Xidian UniversityXi’an 710071ShaanxiChina State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023LiaoningChina State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Xidian UniversityXi’an 710071ShaanxiChina Shaanxi Joint Key Laboratory of Graphene Xidian UniversityXi’an 710071ShaanxiChina Xidian-Wuhu Research Institute Wuhu 241000AnhuiChina

Harnessing energy from the environment promotes the rapid development of micro-power generators and relevant power management modules of alternating current (ac) line-filtering to obtain a stabilized direct current (DC) output for storage and use. Micro-supercapacitors (MSCs) with miniaturized volume and high-frequency response are regarded as a critical component in filtering circuits for microscale power conversion. Here, we reported the fabrication of the wafer-sized planar MSCs (M-MSCs) based on 2D Ti_(2)C_(2)T_(6) MXene using a photolithography technique. The M-MSCs exhibited an areal capacitance of 153 μF cm^(-2) and a frequency characteristic (f_(0)) of 5.6 k Hz in aqueous electrolyte. Moreover, by employing suitable ionic liquid as electrolyte, the voltage window was expanded to 2 V and the f_(0) could be pushed to 6.6 k Hz relying on the electrical double-layer mechanism and lower adsorption energy while maintaining quasi-rectangular cyclic voltammogram curves at 5000 V s^(-1). Furthermore, the integrated MSCs pack was constructed and exhibited excellent rectifying ability by filtering various highfrequency 5000 Hz ac signals with different waveforms into stable DC outputs. Such ultrahigh-rate and high-voltage M-MSCs module for k Hz ac line-filtering would be potentially integrated with customizable electronics to realize on-chip rectifiers in high-density integrated circuit.

关键词： MXene Micro-supercapacitors Ionic liquid Photolithography ac line-filtering Energy storage

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Recent advances in micro-supercapacitors for ac line-filtering performance:From fundamental models to emerging applications

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eScience 2021年第2期1卷 124-140页

作者： Xin Feng Xiaoyu Shi Jing Ning Dong Wang Jincheng Zhang Yue Hao Zhong-Shuai Wu Guangzhou Wide Bandgap Semiconductor Innovation Center Xidian UniversityXi'an710071China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian116023China The State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Xidian UniversityXi'an710071China Shaanxi Joint Key Laboratory of Graphene Xidian UniversityXi'an710071China

Recently,micro-supercapacitors(MSCs)have undergone major development as next-generation micro-electrochemical energy storage devices for self-powered,integrated,and wearable systems,thanks to their excellent performance *** particular,their rapid frequency response characteristics make them potential candidates to replace conventional capacitors and function as alternating current(ac)line filters to rectify pulse energy or as current ripple filters in the kHz ***,few papers have been published about the associated fundamental device components,architectures,and correct characterization of MSCs applied in filter *** addition,it is a huge challenge to achieve a balance between capacitance and frequency response,not yet to be *** review comprehensively summarizes recent advances in MSCs for ac line-filtering,from fundamental mechanisms to appropriate characterization and emerging *** attention is given to progress in microfabrication strategies,electrode materials,and electrolytes for high-frequency *** also present perspectives and insights into the development of MSCs in different frequency ranges for ac line-filtering applications.

关键词： Micro-supercapacitors Filter capacitors ac line-filtering High-frequency Highly ordered materials

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High Density 3D Carbon Tube Nanoarray Electrode Boosting the Capacitance of Filter Capacitor

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Nano-Micro Letters 2024年第11期16卷 242-254页

作者： Gan Chen Fangming Han Huachun Ma Pei Li Ziyan Zhou Pengxiang Wang Xiaoyan Li Guowen Meng Bingqing Wei Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and NanotechnologyInstitute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031People’s Republic of China Department of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026People’s Republic of China Department of Mechanical Engineering University of DelawareNewarkDE 19716USA Mechano‑X Institute Applied Mechanics LaboratoryDepartment of Engineering MechanicsTsinghua UniversityBeijing 100084People’s Republic of China

Electric double-layer capacitors(EDLCs)with fast frequency response are regarded as small-scale alternatives to the commercial bulky aluminum electrolytic *** carbon-based nanoarray electrodes with precise alignment and smooth ion channels is crucial for enhancing EDLCs’***,controlling the density of macropore-dominated nanoarray electrodes poses challenges in boosting the capacitance of line-filtering ***,a simple technique to finely adjust the vertical-pore diameter and inter-spacing in three-dimensional nanoporous anodic aluminum oxide(3D-AAO)template is achieved,and 3D compactly arranged carbon tube(3D-CacT)nanoarrays are created as electrodes for symmetrical EDLCs using nanoporous 3D-AAO template-assisted chemical vapor deposition of *** 3D-CacT electrodes demonstrate a high surface area of 253.0 m^(2) g^(−1),a D/G band intensity ratio of 0.94,and a C/O atomic ratio of *** a result,the high-density 3D-CT nanoarray-based sandwich-type EDLCs demonstrate a record high specific areal capacitance of 3.23 mF cm^(-2) at 120 Hz and exceptional fast frequency response due to the vertically aligned and highly ordered nanoarray of closely packed CT *** 3D-CT nanoarray electrode-based EDLCs could serve as line filters in integrated circuits,aiding power system miniaturization.

关键词： Compactly arranged Three-dimensional carbon tube nanoarray Dimensional carbon tube nanoarray Fast frequency response Electric double-layer capacitors Layer capacitors ac line-filtering filtering

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