Facile synthesis of N/B co-doped hierarchically porous carbon materials based on threonine protic ionic liquids for supercapacitor

Wang, He; Zhou, Hua; Wu, Shumeng; Li, Zhaoge; Fan, Bingbing; Li, Yonghong; Zhou, Yanmei

doi:10.1016/j.electacta.2021.138230

Cited by 34 publications

(23 citation statements)

References 52 publications

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“…and S 2p, indicating the presence of four elements: C, N, S and O [35]. As tabulated in Table 1, the N and S content increased from 4.91 and 2.14 at.% to 8.11 and 3.01 at.% as the addition of L-cysteine increased.…”

Section: Resultsmentioning

confidence: 87%

“…The surface chemical conditions of NSUC-x were investigated by XPS techniques. All spectra presented in Figure 3a exhibit signals for the binding energies of C 1s, O 1s, N 1s and S 2p, indicating the presence of four elements: C, N, S and O [35]. As tabulated in Table 1, the N and S content increased from 4.91 and 2.14 at.% to 8.11 and 3.01 at.% as the addition of L-cysteine increased.…”

Section: Resultsmentioning

confidence: 88%

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Highly active N, S Co-Doped Ultramicroporous Carbon for High-Performance Supercapacitor Electrodes

2022

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N, S-doped ultramicroporous carbons (NSUC-x) with a high nitrogen/sulfur content and a narrow pore-size distribution of around 0.55 nm were firstly prepared using L-cysteine as a nitrogen and sulfur source. The phase, graphitization degree, morphology, specific surface area, pore structure and surface condition of NSUC-x are investigated to analyze the key role in electrochemical performance. Such an ultramicroporous structure and N, S doping not merely provide a high-specific surface area and a suitable pore size, but also induce a good wettability for the fast transport and adsorption of electrolyte ions. Due to the above strategies, the typical NSUC-0.4 exhibits a high gravimetric capacitance of 339 F g−1 at 0.5 A g−1 as well as a capacity retention of 91.6% after 10,000 cycles in a three-electrode system using a 6 M KOH electrolyte. More attractively, a NSUC-0.4-assembled symmetrical supercapacitor delivers an energy output of 7.4 Wh kg−1 at 100 W kg−1 in 6 M KOH as well as a capacity retention of 92.4% after 10,000 cycles, indicating its practical application prospect. Our findings open up new prospects for the design and electrochemical application of N, S-doped ultramicroporous carbons.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 88%

Highly active N, S Co-Doped Ultramicroporous Carbon for High-Performance Supercapacitor Electrodes

2022

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“…After the pyrolysis of micelles, HPC spheres were achieved. 105 In addition to cationic surfactants, triblock polymers are nonionic structure-directing agents that produce HPCs with ordered mesoporous walls, the most popular one of which is poly(ethylene glycol)-poly(propylene glycol)-poly (ethylene glycol), for example, F127, [106][107][108][109][110] and poly (ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO), for example, P123. [111][112][113] F127 and P123 have different molecular weights, but similar structures, which are composed of a central hydrophobic block of polypropylene (PP) glycol/oxide and hydrophilic blocks of polyethylene glycol/oxide at two chain ends.…”

Section: Soft Templatesmentioning

confidence: 99%

“…Driven by the electrostatic interaction between the CTAB chains, H 2 BO 3 − , HSO 4 − , and threonine, self‐assembled micelles formed at the interface. After the pyrolysis of micelles, HPC spheres were achieved 105 . In addition to cationic surfactants, triblock polymers are nonionic structure‐directing agents that produce HPCs with ordered mesoporous walls, the most popular one of which is poly(ethylene glycol)–poly(propylene glycol)–poly(ethylene glycol), for example, F127, 106–110 and poly(ethylene oxide)–poly(propylene oxide)–poly(ethylene oxide) (PEO–PPO–PEO), for example, P123 111–113 …”

Section: Synthetic Strategies Of Hpcsmentioning

confidence: 99%

Status and perspectives of hierarchical porous carbon materials in terms of high‐performance lithium–sulfur batteries

et al. 2022

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Lithium-sulfur (Li-S) batteries, although a promising candidate of nextgeneration energy storage devices, are hindered by some bottlenecks in their roadmap toward commercialization. The key challenges include solving the issues such as low utilization of active materials, poor cyclic stability, poor rate performance, and unsatisfactory Coulombic efficiency due to the inherent poor electrical and ionic conductivity of sulfur and its discharged products (e.g., Li 2 S 2 and Li 2 S), dissolution and migration of polysulfide ions in the electrolyte, unstable solid electrolyte interphase and dendritic growth on anodes, and volume change in both cathodes and anodes. Owing to the high specific surface area, pore volume, low density, good chemical stability, and particularly multimodal pore sizes, hierarchical porous carbon (HPC) materials have received considerable attention for circumventing the above problems in Li-S batteries. Herein, recent progress made in the synthetic methods and deployment of HPC materials for various components including sulfur cathodes, separators and interlayers, and lithium anodes in Li-S batteries is presented and summarized. More importantly, the correlation between the structures (pore volume, specific surface area, degree of pores, and heteroatom-doping) of HPC and the electrochemical performances of Li-S batteries is elaborated. Finally, a discussion on the challenges and future perspectives associated with HPCs for Li-S batteries is provided.

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“…6−8 The former approach is used to increase the amount of charge stored at the electrode/electrolyte interface by the pore structure of materials or pseudocapacitive components into materials. 9 The construction of a porous structure has a direct bearing on the accommodation and transportation of ions in electrolytes. In particular, the micropores in materials have higher charge-storage density, and the pore size can affect the ion partitioning and packing inside the pores.…”

Section: ■ Introductionmentioning

confidence: 99%

A Chlorine-Based Redox Electrochemical Capacitor

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Electrochemical capacitors are under the spotlight due to their high power density, but they have a low energy density. Redox electrolytes have emerged as a promising approach to design high-energy electrochemical energy storage devices. Herein, a chlorine-based redox electrochemical capacitor is reported in an ionic liquid electrolyte. The commercial activated carbon is employed as the working electrode to render the reversible redox of chloride ions in an ionic liquid, by the restriction of micropores on neutral chlorine. The carbon material can simultaneously provide electrical double-layer capacitance. The effective integration of a chlorine redox reaction and electrical double layer allows for high-energy electrochemical capacitors. By this means, a rechargeable chlorine-based redox electrochemical capacitor with reversible capacity and good rate capability and cycling stability is obtained. This work offers a solution for a new type of high-energy electrochemical capacitors.

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Facile synthesis of N/B co-doped hierarchically porous carbon materials based on threonine protic ionic liquids for supercapacitor

Cited by 34 publications

References 52 publications

Highly active N, S Co-Doped Ultramicroporous Carbon for High-Performance Supercapacitor Electrodes

Highly active N, S Co-Doped Ultramicroporous Carbon for High-Performance Supercapacitor Electrodes

Status and perspectives of hierarchical porous carbon materials in terms of high‐performance lithium–sulfur batteries

A Chlorine-Based Redox Electrochemical Capacitor

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