Facile synthesis of microporous carbon for supercapacitors with a LiNO3 electrolyte

Luo, Heming; Yang, Yanfei; Mu, Bo; Chen, Yanzheng; Zhang, Jianqiang; Zhao, Xia

doi:10.1016/j.carbon.2016.01.004

Cited by 36 publications

(18 citation statements)

References 45 publications

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“…In addition, the assembly of aqueous supercapacitors does not need anhydrous condition. [19][20][21][22][23] Gao et al investigated the cell voltage of symmetric supercapacitors (SSCs) based on H 2 O 2 -treated commercial carbon in 2 m Li 2 SO 4 . Limited by water splitting, aqueous symmetric CSCs deliver a narrow cell voltage range (0-1 V) in common electrolytes such as H 2 SO 4 or KOH, engendering low energy density (<10 W h kg −1 ).…”

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confidence: 99%

“…Limited by water splitting, aqueous symmetric CSCs deliver a narrow cell voltage range (0–1 V) in common electrolytes such as H 2 SO 4 or KOH, engendering low energy density (<10 W h kg −1 ) . For the sake of conquering the above problem, some researchers have exploited symmetric CSCs with neutral electrolyte including Li 2 SO 4 , LiNO 3 , Na 2 SO 4 , NaNO 3 etc., exhibiting higher working voltages . Gao et al investigated the cell voltage of symmetric supercapacitors (SSCs) based on H 2 O 2 ‐treated commercial carbon in 2 m Li 2 SO 4 .…”

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confidence: 99%

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Fabricating an Aqueous Symmetric Supercapacitor with a Stable High Working Voltage of 2 V by Using an Alkaline–Acidic Electrolyte

Wu²,

Wang

et al. 2018

Advanced Science

139

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Aqueous symmetric carbon‐based supercapacitors (CSCs) are always the research focus for energy storage devices because of the virtue of low cost, inherent safety, and encouraging electrochemical stability. As is well‐known, so far most aqueous symmetric CSCs are subjected to low energy densities. Here, a symmetric supercapacitor comprising electrodes from biomass‐derived activated carbon and alkaline–acidic electrolyte is reported. This aqueous symmetric CSC demonstrates exceptional electrochemical performance with high stable working voltage of 2 V and attractive cycling stability of no capacitance loss over 10 000 cycles. Impressively, it shows a remarkable energy density of 36.9 W h kg−1 at 248 W kg−1 based on the total mass of the active materials, which is much higher than traditional aqueous symmetric CSCs, and a power density of 4083 W kg−1 with an energy density of 8.8 W h kg−1. The use of stable alkaline–acidic electrolyte provides an innovative technique to enhance the energy density of aqueous supercapacitors.

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confidence: 99%

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confidence: 99%

Fabricating an Aqueous Symmetric Supercapacitor with a Stable High Working Voltage of 2 V by Using an Alkaline–Acidic Electrolyte

Wu²,

Wang

et al. 2018

Advanced Science

139

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“…The pores developed under chitosan influence are interdigitated with each other to form a three-dimensional (3D), interconnected frame structure, the morphology of the carbon materials being sensitive to chitosan use. This special structure enables the pores inside the material to communicate with each other and allows the electrolyte to penetrate the electrode material more smoothly, accelerate the transport of electrolyte ions, reduce the “traffic blockage” in the ion transport process, and thus improve capacitance performance [ 34 , 35 ]. The SCS-R samples ( Figure 1 a,c) and SGF-R samples ( Figure 1 b,d) exhibit differences in morphology.…”

Section: Resultsmentioning

confidence: 99%

The Improvement of Energy Storage Performance by Sucrose-Derived Carbon Foams via Incorporating Nitrogen Atoms

et al. 2021

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This paper addresses the problem of improving electrochemical energy storage with electrode materials obtained from common raw ingredients in a facile synthesis. In this study, we present a simple, one-pot route of synthesizing microporous carbon via a very fast reaction of sucrose and graphene (carbon source), chitosan (carbon and nitrogen source), and H3PO4. Porous carbons were successfully produced during high temperature carbonization, using nitrogen as a shielding gas. Samples were characterized using X-ray powder diffractometry, elemental analysis, N2 adsorption-desorption measurements, scanning electron microscopy, and Raman spectroscopy. The developed carbon material possessed a high surface area, up to 1313 m2 g−1, with no chemical or physical activators used in the process. The structural parameters of the microporous carbons varied depending on the ratio of reagents and mass composition. Samples were prepared both with and without chitosan. The present synthesis route has the advantages of being a single-step approach and only involving low-cost and environmentally friendly sources of carbon. More importantly, microporous carbon was prepared without any activators and potentially offers great application in supercapacitors. Cyclic voltammetry and constant current charge–discharge tests show that sucrose-based porous carbons show excellent electrochemical performance with a specific capacitance of up to 143 F g−1 at a current density of 1 A g−1 in a 6 M KOH electrolyte.

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“…[37] Ramans pectra of theses amples in Figure 3b furtherc onfirm this result.H CNs-AC, especially HCNs-AC90, has ah igherDband and lower Gb and than the non-activated HCNs.T he peaks of the Da nd Gb ands are centered at % 1364.91 and % 1588.67 cm À1 ,r espectively.T he Db and is related to the double-resonance Ramanp rocess in disordered carbon. [38][39][40] The intensity of the Db and depends on the uniformity of the disordered carbon. [41] The intensity of Gb and is determined by the graphitic carbonp hase.…”

Section: Resultsmentioning

confidence: 99%

“…The peaks of the D and G bands are centered at ≈1364.91 and ≈1588.67 cm −1 , respectively. The D band is related to the double‐resonance Raman process in disordered carbon . The intensity of the D band depends on the uniformity of the disordered carbon .…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Ultrahigh‐Surface‐Area Hollow Carbon Nanospheres and their Application in Lithium‐Sulfur Batteries

Zeng

Yao

Huang

et al. 2018

Chemistry A European J

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Hollow carbon nanospheres (HCNs) with specific surface areas up to 2949 m g and pore volume up to 2.9 cm g were successfully synthesized from polyaniline-co-polypyrrole hollow nanospheres by carbonization and CO activation. The cavity diameter and wall thickness of HCNs can be easily controlled by activation time. Owing to their large inner cavity and enclosed structure, HCNs are desirable carriers for encapsulating sulfur. To better understand the effects of pore characteristics and sulfur contents on the performances of lithium-sulfur batteries, three composites of HCNs and sulfur are prepared and studied in detail. The composites of HCNs with moderate specific surface areas and suitable sulfur content present a better performance. The first discharge capacity of this composite reaches 1401 mAh g at 0.2 C. Even after 200 cycles, the discharge capacity remains at 626 mAh g .

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Facile synthesis of microporous carbon for supercapacitors with a LiNO3 electrolyte

Cited by 36 publications

References 45 publications

Fabricating an Aqueous Symmetric Supercapacitor with a Stable High Working Voltage of 2 V by Using an Alkaline–Acidic Electrolyte

Fabricating an Aqueous Symmetric Supercapacitor with a Stable High Working Voltage of 2 V by Using an Alkaline–Acidic Electrolyte

The Improvement of Energy Storage Performance by Sucrose-Derived Carbon Foams via Incorporating Nitrogen Atoms

Facile Synthesis of Ultrahigh‐Surface‐Area Hollow Carbon Nanospheres and their Application in Lithium‐Sulfur Batteries

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