Effect of different pretreatment methods on sesame husk-based activated carbon for supercapacitors with aqueous and organic electrolytes

Qu, Xiaoxiao; Wang, Kun; Zhang, Chuanxiang; Zhu, Ahui; Wang, Tao; Tian, Ye; Yu, Jia; Xing, Baolin; Huang, Guangxu; Cao, Yijun

doi:10.1007/s10854-019-01107-4

Cited by 21 publications

(6 citation statements)

References 47 publications

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“…AC is mainly synthesized through physical and chemical activation processes [19]. Usually, the first one primarily involves carbonization and further activation in an inert atmosphere or the presence of gas such as CO 2 or oxidizing agents [27], whereas the chemical activation process first includes the development of the porous structures by adding activating agents such as ZnCl 2 , NaOH, H 3 PO 4 , and KOH [12,[28][29][30]. According to studies, ZnCl 2 is not a much preferable active agent due to environmental concerns and incompetent recuperation.…”

Section: Introductionmentioning

confidence: 99%

In Situ Fabrication of Activated Carbon from a Bio-Waste Desmostachya bipinnata for the Improved Supercapacitor Performance

et al. 2021

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Herein, we demonstrate the fabrication of highly capacitive activated carbon (AC) using a bio-waste Kusha grass (Desmostachya bipinnata), by employing a chemical process followed by activation through KOH. The as-synthesized few-layered activated carbon has been confirmed through X-ray powder diffraction, transmission electron microscopy, and Raman spectroscopy techniques. The chemical environment of the as-prepared sample has been accessed through FTIR and UV–visible spectroscopy. The surface area and porosity of the as-synthesized material have been accessed through the Brunauer–Emmett–Teller method. All the electrochemical measurements have been performed through cyclic voltammetry and galvanometric charging/discharging (GCD) method, but primarily, we focus on GCD due to the accuracy of the technique. Moreover, the as-synthesized AC material shows a maximum specific capacitance as 218 F g−1 in the potential window ranging from − 0.35 to + 0.45 V. Also, the AC exhibits an excellent energy density of ~ 19.3 Wh kg−1 and power density of ~ 277.92 W kg−1, respectively, in the same operating potential window. It has also shown very good capacitance retention capability even after 5000th cycles. The fabricated supercapacitor shows a good energy density and power density, respectively, and good retention in capacitance at remarkably higher charging/discharging rates with excellent cycling stability. Henceforth, bio-waste Kusha grass-derived activated carbon (DP-AC) shows good promise and can be applied in supercapacitor applications due to its outstanding electrochemical properties. Herein, we envision that our results illustrate a simple and innovative approach to synthesize a bio-waste Kusha grass-derived activated carbon (DP-AC) as an emerging supercapacitor electrode material and widen its practical application in electrochemical energy storage fields.

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Section: Introductionmentioning

confidence: 99%

In Situ Fabrication of Activated Carbon from a Bio-Waste Desmostachya bipinnata for the Improved Supercapacitor Performance

et al. 2021

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“…Aqueous and organic electrolytes have been extensively used in supercapacitor applications due to their ease of preparation and low cost 40 . Figure 6 shows the cyclic voltammetric responses of the polyaniline film electrodeposited from Ethaline and acidic medium when cycled in 0.5 M Na 2 SO 4 electrolyte between −0.5 and 0.6 V at 50 mV s −1 scan rate.…”

Section: Resultsmentioning

confidence: 99%

“…Aqueous and organic electrolytes have been extensively used in supercapacitor applications due to their ease of preparation and low cost. 40 Figure 6 shows the cyclic voltammetric responses of the polyaniline film electrodeposited from Ethaline and acidic medium when cycled in 0.5 M Na 2 SO 4 electrolyte between −0.5 and 0.6 V at 50 mV s −1 scan rate. The oxidation of the polyaniline film electrodeposited from Ethaline and acidic medium started at around −0.1 V in Na 2 SO 4 cycling electrolyte and the reduction peak corresponding to the oxidation peak was observed around 0.1 V in the reverse direction.…”

Section: Electrochemical Behavior Of Pani Filmsmentioning

confidence: 99%

The use of polyaniline films on flexible tape for supercapacitor applications

2020

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A sticky surface of a tape was adhered to a graphite surface and then the tape was peeled off. The insulator tape was coated with thin graphite and became conductive in order to use flexible tape as a current collector. Aniline was electrodeposited onto a flexible tape substrate having graphite layer by electrochemical polymerization method from an aqueous (H 2 SO 4 solution containing aniline monomers) and non-aqueous media (a deep eutectic solvent containing aniline). The prepared polymeric electrodes were characterized by Fourier transform infrared spectroscopy, Raman, thermogravimetric analysis and scanning electron microscopy techniques. The electrochemical properties of coated and uncoated electrodes were also examined by cyclic voltammetry and galvanostatic charge discharge techniques. The polyaniline (PANI) coated tape can be used as a flexible electrode in supercapacitor applications because PANI coated electrodes are highly electroactive in Na 2 SO 4 electrolyte. After 3000 cycles, the capacitance retention of PANI film electrodeposited from Ethaline bath was 90%, while the areal capacitance of PANI film obtained from acidic medium reaches 50% after 500 cycles. As PANI electrode is stable in an ionic liquid for long cycling, Ethaline ionic liquid can be used as electrolyte for PANI based supercapacitor electrode. PANI coated graphite on tape, which is prepared in an easy and inexpensive way is a promising flexible material for high performance supercapacitors.

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“…Although organic electrolytes and ionic liquids can operate at higher voltage, their ionic conductivity is low. [207,209] In order to explore the effect of different electrolytes on the electrochemical performance of supercapacitor electrodes, our group systematically studied the electrochemical performance of rice straw cellulose hierarchical porous carbon (SCPC) in four commonly used electrolytes of H 2 SO 4 , Na 2 SO 4 , KOH, and tetraethylammonium tetrafluoroborate/propylene carbonate (Et 4 NBF 4 /PC) and the nature behind the difference in the electrochemical performance of SCPC in different electrolytes is revealed. [210] This research not only establishes the relationship between the structure of SCPC and its electrochemical performance in different electrolytes, but also provides a valuable reference for the potential applications of SCPC in different types of supercapacitors (Figure 16a-f).…”

Section: ) Electrolytesmentioning

confidence: 99%

High Mass‐Loading Biomass‐Based Porous Carbon Electrodes for Supercapacitors: Review and Perspectives

Yang

Qiu

2023

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Biomass‐based porous carbon (BPC) with renewability and flexible nano/microstructure tunability has attracted increasing attention as efficient and cheap electrode materials for supercapacitors. To meet commercial needs, high mass‐loading electrodes with high areal capacitance are preferred when designing supercapacitors. The increased mass percentage of active materials can effectively improve the energy density of supercapacitors. However, as the thickness of the electrode increases, it will face the following challenges including severely blocked ion transport channels, poor charging dynamics, poor electrode structural stability, and complex preparation processes. A bridge between theoretical research and practical applications of BPC electrodes for supercapacitors needs to be established. In this review, the advances of high mass‐loading BPC electrodes for supercapacitors are summarized based on different biomass precursors. The key performance evaluation parameters of the high mass‐loading electrodes are analyzed, and the performance influencing factors are systematically discussed, including specific surface area, pore structure, electrical conductivity, and surface functional groups. Subsequently, the promising optimization strategies for high mass‐loading electrodes are summarized, including the structure regulation of electrode materials and the optimization of other supercapacitor components. Finally, the major challenges and opportunities of high mass‐loading BPC electrodes in the future are discussed and outlined.

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Effect of different pretreatment methods on sesame husk-based activated carbon for supercapacitors with aqueous and organic electrolytes

Cited by 21 publications

References 47 publications

In Situ Fabrication of Activated Carbon from a Bio-Waste Desmostachya bipinnata for the Improved Supercapacitor Performance

In Situ Fabrication of Activated Carbon from a Bio-Waste Desmostachya bipinnata for the Improved Supercapacitor Performance

The use of polyaniline films on flexible tape for supercapacitor applications

High Mass‐Loading Biomass‐Based Porous Carbon Electrodes for Supercapacitors: Review and Perspectives

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