Arbitrary waveform AC line filtering applicable to hundreds of volts based on aqueous electrochemical capacitors

Abstract

Filtering capacitor is a necessary component in the modern electronic circuit. Traditional filtering capacitor is often limited by its bulky and rigid configuration and narrow workable scope of applications. Here, an aqueous hybrid electrochemical capacitor is developed for alternating current line filtering with an applicable wide frequency range from 1 to 10,000 Hz. This capacitor possesses an areal specific energy density of 438 μF V 2 cm −2 at 120 Hz, which to the best of our knowledge is record high among aqueous electrochemical capacitors reported so far. It can convert arbitrary alternating current waveforms and even noises to straight signals. After integration of capacitor units, a workable voltage up to hundreds of volts (e.g., 200 V) could be achieved without sacrificing its filtering capability. The integrated features of wide frequency range and high workable voltage for this capacitor present promise for multi-scenario and applicable filtering capacitors of practical importance.

Maximization of Spatial Charge Density: An Approach to Ultrahigh Energy Density of Capacitive Charge Storage

“…[17,18] Considering that the charge-carrier ions are adsorbed on the active surface within the electrode material, the microstructure of the electrode material will directly dominate the distribution of charge-carrier ions in one electrode. [19] Therefore,anordered and compact carbon scaffold is indispensable and of great importance to densely and neatly pack the solvated chargecarrier ions.A ccordingly,ahighly ordered and compact porous carbon (HOPC) was prepared (Supporting Information, Figures S1-S5), as reported in our previous works. [20,21] Thehighly ordered and compact microstructure provides the HOPC with an ultrahigh volumetric specific surface area (SSA) of 1959 m 2 cm À3 (Supporting Information, Figure S6), which makes HOPC fully capable of storing large amounts of charges in ag iven space.…”

Vertical Graphene Arrays for AC Line-Filtering Capacitors

“…With the rapid development of portable electronic products, wearable devices, electric vehicles, and other energy storage devices toward lightweight and miniaturization, electrochemical capacitors (ECs) with fast rate capability, appreciable capacitance density, long cycling life, and appropriate flexibility have attracted extensive attention [1][2][3][4][5] . In particular, the high-frequency responsive EC, which smooths the leftover alternate currents (AC) ripples into direct currents (DC) in line-powered devices at 120 Hz, is an encouraging alternate for the bulky and rigid aluminum electrolytic capacitor (AEC) [6][7][8][9] . However, integration of high energy density and high frequency response properties within a tiny EC device still remains a challenge, which lies in mutually exclusive requirements for complex electrode structures [10][11][12][13] .…”

Two‐dimensional materials of group‐IVA boosting the development of energy storage and conversion

“…Initially, we will outline various classes of 2D group-IV materials, as well as highlight layered structures and synthesis approaches based on mechanical and chemical exfoliation, chemical vapor deposition (CVD), and molecular beam epitaxy. Furthermore, some recent progress on their broad applications involving batteries, [2][3][4][5] capacitors, [6][7][8] and moist electric generator [23][24][25][26] are reviewed. Finally, we will give a perspective on 2D group-IV materials applied in future electronic and energy devices.…”

“…Herein, we present a detailed review that introduces the recent advances of 2D group‐IV materials beyond graphene. Initially, we will outline various classes of 2D group‐IV materials, as well as highlight layered structures and synthesis approaches based on mechanical and chemical exfoliation, chemical vapor deposition (CVD), and molecular beam epitaxy 1‐39 . Furthermore, some recent progress on their broad applications involving batteries, 2‐5 capacitors, 6‐8 and moist electric generator 23‐26 are reviewed.…”

“…These contribute to its versatile utility in many fields. As graphene, a single-atom-thick nanosheet with sp 2 -hybridized carbon atoms, was mechanically exfoliated from graphite, 1 many efforts have been taken to enrich its fascinating properties and expand its a large range of applications, including batteries, [2][3][4][5] supercapacitors, [6][7][8] catalysis, [9][10][11][12][13][14][15][16][17] solar water evaporation, [18][19][20][21][22] moist electric generator. [23][24][25][26] Similar to graphene, silicene, [27][28][29] siloxene, [30][31][32] germanene, [33][34][35][36] stanene, 37,38 and plumbene 39 belonging to group-IVA are verified by theoretical and experimental results, rendering them potential candidates for future nanodevices.…”