Structurally integrated 3D carbon tube grid–based high-performance filter capacitor

Abstract

Filter capacitors play a critical role in ensuring the quality and reliability of electrical and electronic equipment. Aluminum electrolytic capacitors are the most commonly used but are the largest filtering components, limiting device miniaturization. The high areal and volumetric capacitance of electric double-layer capacitors should make them ideal miniaturized filter capacitors, but they are hindered by their slow frequency responses. We report the development of interconnected and structurally integrated carbon tube grid–based electric double-layer capacitors with high areal capacitance and rapid frequency response. These capacitors exhibit excellent line filtering of 120-hertz voltage signal and volumetric advantages under low-voltage operations for digital circuits, portable electronics, and electrical appliances. These findings provide a sound technological basis for developing electric double-layer capacitors for miniaturizing filter and power devices.

The Progress and Comprehensive Analysis of Supercapacitors for Alternating Current Line Filtering: A Review

“…In the same year, David's team [7] achieved an ultrafast response of up to 20 ms with onion‐like nanocarbon electrodes in a 3 V TEABF 4 /PC electrolyte. Recently, a structurally integrated 3D carbon tube grid‐based SC exhibited an excellent filtering performance [8] . Obviously, these results satisfy the AC filtering requirements for the ultrafast frequency response (8 ms) and impedance phase angle (80° at 120 Hz) [1c,9] .…”

“…Recently, a structurally integrated 3D carbon tube grid-based SC exhibited an excellent filtering performance. [8] Obviously, these results satisfy the AC filtering requirements for the ultrafast frequency response (8 ms) and impedance phase angle (80°at 120 Hz). [1c,9] This is quite attractive and promising, as well as their well-known high specific capacitance, which further stimulates the research and development (R&D) of SCs in this relatively new field.…”

Recent advances in polyaniline-based micro-supercapacitors

“…[98][99][100] Generally, four strategies can be employed for the fabrication of 3D MSCs, as follows: (i) use of porous 3D template for the construction of 3D electrodes, followed by removal of the template after the 3D electrodes are successfully built. 101 In this case, the 3D structure is introduced by a self-sacrificing template. (ii) Depositing an electrode layer uniformly on an existing conductive 3D scaffold.…”

Understanding and Optimizing Capacitance Performance in Reduced Graphene‐Oxide Based Supercapacitors

“…[1][2][3][4] Meanwhile, SCs are being increasingly integrated with battery and fuel cell systems to enhance efficiencies and overall capabilities of electrochemical energy storage systems (EESs). [5][6][7] The energy storage mechanism of NPCs-based SCs is predominantly via the electrical double layer capacitance (EDLC). In this mechanism, upon charging, electric charges and adsorbed counter ions accumulate on the electrode surface and it is this phenomenon that directly defines the output capacitance or energy/power density.…”