Vertical Graphene Arrays as Electrodes for Ultra-High Energy Density AC Line-Filtering Capacitors

Shichen Xu; Yeye Wen; Zhuo Chen; Nannan Ji; Zhigang Zou; Mingmao Wu; Liangti Qu; Jin Zhang

doi:10.1002/anie.202111468

Vertical Graphene Arrays as Electrodes for Ultra-High Energy Density AC Line-Filtering Capacitors

Angew Chem Int Ed Engl. 2021 Nov 8;60(46):24505-24509. doi: 10.1002/anie.202111468. Epub 2021 Oct 12.

Authors

Shichen Xu^{1

2}, Yeye Wen^{1

2}, Zhuo Chen^{1

2}, Nannan Ji², Zhigang Zou^{3

4}, Mingmao Wu³, Liangti Qu⁵, Jin Zhang^{1

2

6}

Affiliations

¹ Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.
² Beijing Graphene Institute (BGI), Beijing, 100095, P. R. China.
³ Key Laboratory of Eco-materials Advanced Technology, College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, P. R. China.
⁴ National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing, 210093, P. R. China.
⁵ Department of Chemistry, Tsinghua University, Beijing, 100871, P. R. China.
⁶ School of Materials Science and Engineering, Peking University, Beijing, 100095, P. R. China.

PMID: 34533871
DOI: 10.1002/anie.202111468

Abstract

High-frequency responsive electrochemical capacitor (EC), as an ideal lightweight filtering capacitor, can directly convert alternating current (AC) to direct current (DC). However, current electrodes are stuck in limited electrode area and tortuous ion transport. Herein, strictly vertical graphene arrays (SVGAs) prepared by electric-field-assisted plasma enhanced chemical vapour deposition have been successfully designed as the main electrode to ensure ions rapidly adsorb/desorb in richly available graphene surface. SVGAs exhibit an outstanding specific areal capacitance of 1.72 mF cm^-2 at Φ₁₂₀ =80.6° even after 500 000 cycles, which is far better than that of most carbon-related materials. Impressively, the output voltage could also be improved to 2.5 V when using organic electrolyte. An ultra-high energy density of 0.33 μWh cm^-2 can also be handily achieved. Moreover, ECs-SVGAs can well smooth arbitrary AC waveforms into DC signals, exhibiting excellent filtering performance.

Keywords: electric field; filtering capacitor; phase angle; specific areal capacitance; strictly vertical graphene arrays.

Abstract

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