Effects of Aqueous Electrolytes in Supercapacitors

Ibukun, Olaniyan; Jeong, Hae Kyung

doi:10.3938/npsm.69.154

Cited by 20 publications

(9 citation statements)

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“…Meanwhile, when the potential was increased to 1.6 V, the anodic current increased noticeably, with a little IR reduction due to electrolyte decomposition [3,43,52–55] . When the potential window was increased beyond 1.5 V to 2.0 V, no apparent anodic currents were observed in 6 M KOH or 1 M Na 2 SO 4 , respectively.…”

Section: Resultsmentioning

confidence: 96%

“…The Nyquist plots (Figure 7d) showed typical characteristics of porous carbon electrodes with semicircles (whose width indicated bulk electrolyte resistance ()), non‐vertical lines at intermediate frequencies, and nearly vertical lines at low frequencies (provides information regarding the electrode capacitive behaviour). The resistances of the electrode ( R el ) and diffuse layer ( R dl ) were calculated from the real axis intercept in the high‐ and intermediate‐frequency areas, respectively [3,4,50–54] . The electrode resistances ( R el ) were minimal and did not differ significantly between the three electrodes in all of the electrolytes, according to the analysis.…”

Section: Resultsmentioning

confidence: 99%

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N and P Co‐doped Green Waste Derived Hierarchical Porous Carbon as a Supercapacitor Electrode for Energy Storage: Electrolyte Effects

2023

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N, P dual-doped watermelon peel-derived carbon (NPW) was prepared and found to exhibit a larger specific surface area of 1809 m 2 g À 1 and improved hierarchically interconnected pores than N-doped and P-doped carbons. The NPW electrode exhibits excellent electrochemical activity in a three-electrode setup with 1 M H 2 SO 4 , 6 M KOH, and 1 M Na 2 SO 4 electrolytes; with high specific capacitance (498.8, 397.6, and 378.6 F g À 1 at 1 A g À 1 , respectively) and an average capacitance retention of ∼ 96.9 % after 10,000 charge-discharge cycles at 10 A g À 1 . The NPW//NPW-based symmetric cell with 1 M H 2 SO 4 -PVA-electrolyte provided a high energy density of 71.84 Wh kg À 1 at 1 A g À 1 and a specific capacitance of 263.9 F g À 1 . In the neutral electrolyte, NPW showed a wider operating voltage window of up to 2.0 V with no discernible anodic current and delivered 97.11 Wh kg À 1 energy density.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

N and P Co‐doped Green Waste Derived Hierarchical Porous Carbon as a Supercapacitor Electrode for Energy Storage: Electrolyte Effects

2023

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“…Thus, the electrolyte ion size should be equal or less than the pore size of the electrode material giving a high capacitance and high-power density. 26,27 z E-mail: sujamystica@yahoo.com; sreeja.pb@christuniversity.in In line with the preceding discussions, the purpose of this study is to assess the capacitance behaviour of imidazole azo modified CNT/ PPy (I m -CNT/PPy) electrode material in various electrolytes. The mechanical property and electrochemical performances of the synthesized I m -CNT composite were enhanced by the incorporation of PPy.…”

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confidence: 90%

Capacitive Behaviour of Imidazole Azo Modified Carbon Nanotubes/Polypyrrole Composite in Aqueous Electrolytes

Baby,

A.,

et al. 2023

J. Electrochem. Soc.

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Here, we reported imidazole azo (Im) modified carbon nanotubes (CNT) grafted polypyrrole (PPy) via the chemical oxidation method. The synthesized hybrid material has shown a unique structure consisting of carbon nanotubes with a conductive network via polypyrrole. The presence of Im derivatives has helped CNTs to enhance their electrochemical performances. The as synthesized composite was characterized using various techniques like Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy. The morphological studies were performed using scanning electron microcopy, which also confirmed the nature of the composite. The electrochemical performances of the electrode material were investigated using cyclic voltammetry, galvanostatic charge- discharge, and electrochemical impedance spectroscopy in various electrolytes. The best performance of the electrode material was observed in 1M H2SO4 with a specific capacitance of 305 F g-1 at a current density of 1 A g-1. The electrode material also showed a coulombic efficiency of 96% even after 5000 cycles.

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“…The effect of various aqueous electrolytes has been extensively studied with various carbon powder composite electrodes [17][18][19]. A few studies have been performed with fibrous electrodes [20] or electrospun carbon-containing electrodes [21] in aqueous electrolytes but, to our knowledge, no studies have directly electrospun fibrous electrodes of CDCs.…”

Section: Introductionmentioning

confidence: 99%

The Performance of Fibrous CDC Electrodes in Aqueous and Non-Aqueous Electrolytes

Malmberg

Arulepp

Laanemets

et al. 2021

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The aim of this study was to investigate the electrochemical behaviour of aqueous electrolytes on thin-layer (20 µm) nanoporous carbide-derived carbon (CDC) composite fibrous directly electrospun electrodes without further carbonisation. There have been previously investigated fibrous electrodes, which are produced by applying different post-treatment processes, however this makes the production of fibrous electrodes more expensive, complex and time consuming. Furthermore, in the present study high specific capacitance was achieved with directly electrospun nanoporous CDC-based fibrous electrodes in different neutral aqueous electrolytes. The benefit of fibrous electrodes is the advanced mechanical properties compared to the existing commercial electrode technologies based on pressure-rolled or slurry-cast powder mix electrodes. Such improved mechanical properties are preferred in more demanding applications, such as in the space industry. Electrospinning technology also allows for larger electrode production capacities without increased production costs. In addition to the influence of aqueous electrolyte chemical composition, the salt concentration effects and cycle stability with respect to organic electrolytes are investigated. Cyclic voltammetry (CV) measurements on electrospun electrodes showed the highest capacitance for asymmetrical cells with an aqueous 1 M NaNO3-H2O electrolyte. High CV capacitance was correlated with constant current charge–discharge (CC) data, for which a specific capacitance of 191 F g−1 for the positively charged electrode and 311 F g−1 for the negatively charged electrode was achieved. The investigation of electrolyte salt concentration on fibrous electrodes revealed the typical capacitance dependence on ionic conductivity with a peak capacitance at medium concentration levels. The cycle-life measurements of selected two-electrode test cells with aqueous and non-aqueous electrolytes revealed good stability of the electrospun electrodes.

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Effects of Aqueous Electrolytes in Supercapacitors

Cited by 20 publications

References 0 publications

N and P Co‐doped Green Waste Derived Hierarchical Porous Carbon as a Supercapacitor Electrode for Energy Storage: Electrolyte Effects

N and P Co‐doped Green Waste Derived Hierarchical Porous Carbon as a Supercapacitor Electrode for Energy Storage: Electrolyte Effects

Capacitive Behaviour of Imidazole Azo Modified Carbon Nanotubes/Polypyrrole Composite in Aqueous Electrolytes

The Performance of Fibrous CDC Electrodes in Aqueous and Non-Aqueous Electrolytes

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