MXene Surface Functional Groups Regulation: Enhancing Area Capacitance of Divalent Zinc Ion Micro-Supercapacitor

Peng, ruhai; Han, Kaiwei; Tang, Kun

doi:10.1149/1945-7111/ac72ca

Cited by 11 publications

(2 citation statements)

References 39 publications

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“…Chemical post-treatment with oxidative aqueous solutions (e.g. KOH, ammonium persulfate) substitutes the -O termination for the other terminations [28,29]. It should be emphasized that most MXene electrodes reported previously contain the -O termination to exhibit strong charge transfer with adsorbed cations, and hence dominates the electrochemical properties [21,22].…”

Section: Introductionmentioning

confidence: 99%

Influence of surface termination groups on electrochemical charge storage of MXene electrodes

Kawai¹,

Fujita²,

Iizuka³

et al. 2022

2D Mater.

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Two-dimensional transition-metal carbides/nitrides (MXenes) have been intensively investigated as electrode materials for electrochemical energy storage devices, such as batteries and supercapacitors, due to their high electronic conductivity and open interlayer spaces. Although MXenes possess various surface termination groups (e.g., –O, –OH, –F, –Cl, and –Br) that directly interact with the accumulated cations to exhibit charge transfer, the influence of each surface termination group on the electrochemical properties of MXene remains elusive. Herein, we report the electrochemical properties of MXenes with controlled surface termination groups. We found that the termination groups play a crucial role in electrochemical reactions in both aqueous and non-aqueous electrolytes.

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Section: Introductionmentioning

confidence: 99%

Influence of surface termination groups on electrochemical charge storage of MXene electrodes

Kawai¹,

Fujita²,

Iizuka³

et al. 2022

2D Mater.

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show abstract

“…Other researchers improved the pseudocapacitance of active carbon materials by introducing heteroatom dopants by supplementary Aniline sources 14,15 or complex synthesized metal-organic framework 16,17 and MXene materials. [18][19][20][21] However, the excessive cost, tedious and time-consuming preparation process remains the key challenge for marketization. 11,[22][23][24] Recently, biomaterials, especially plants or biomass with fibrous structures and abundant heteroatoms, have been successfully employed for preparing carbon materials by the simple and low-preparing-cost way.…”

mentioning

confidence: 99%

Nitrogen and Oxygen Dual-doped Porous Carbon from Nature Macromolecular Chitosan for Fast and Stable Zinc-ion Hybrid Supercapacitors

Yang

Huang

Zhao

et al. 2023

J. Electrochem. Soc.

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Zinc ion hybrid capacitors (ZIHCs) with carbon-based material cathodes have shown considerable potential in many energy-related applications since they have the advantages of supercapacitors and batteries. However, these carbon-based materials still suffer from the limitations of low energy density and poor cycle stability as cathodes in ZIHCs because of their low surface areas and unsatisfied chemical structures. Herein, nitrogen and oxygen dual-doped porous carbon materials were prepared in situ by using the precursors of nature macromolecular chitosan with abundant amino and hydroxyl groups. Due to the developed mesopores, solid structures, and fast redox response from the dual-doped N and O heteroatoms, the prepared ZIHCs based on these novel carbon materials show high specific capacity of 100 mAh g-1, outstanding energy density of 172.24 Wh kg-1 and good stability over 20,000 cycles at large charging/discharging current density of 5 A g-1. These findings will contribute greatly to the development of environmentally friendly Zn-based energy devices.

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Multiple Redox‐Active Cyano‐Substituted Organic Compound Integrated with MXene Nanosheets for High‐Performance Flexible Aqueous Zn‐Ion Battery

Zhao,

Li,

et al. 2024

Adv Funct Materials

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An eco‐friendly organic compound, with rich redox sites, considered a promising cathode material for aqueous zinc‐ion batteries (AZIBs). Despite its potential, limited specific capacity and cycle instability impede its practical application. Herein, an organic compound, hexaazatriphenylene hexacarbonitrile (6CN‐HAT), is designed with a π–π conjugated aromatic structure, and integrated with MXene nanosheets to construct a flexible self‐supporting electrode (6CN‐HAT@MXene). Ex‐situ characterizations and theoretical calculations verify that the charge storage mechanism predominantly involves coordination and non‐coordination reactions between reactive C═N and ─CN sites with cations. The introduction of MXene nanosheets not only bolster the stability and electronic conductivity of the 6CN‐HAT@MXene but also expose additional active sites for cation coordination. As a cathode material in AZIBs, 6CN‐HAT@MXene exhibits an outstanding discharge specific capacity of 413 mAh g−1 at 0.05 A g−1. Remarkably, even after 5000 cycles at 5 A g−1, the discharge capacity retained 91%. Furthermore, based on the 6CN‐HAT@MXene electrode, a flexible micro‐zinc‐ion batteries with high area capacity of 257.4 mF cm−2 is prepared using laser cutting technology, highlighting its potential for future applications in portable and wearable electronic devices.

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MXene Surface Functional Groups Regulation: Enhancing Area Capacitance of Divalent Zinc Ion Micro-Supercapacitor

Cited by 11 publications

References 39 publications

Influence of surface termination groups on electrochemical charge storage of MXene electrodes

Influence of surface termination groups on electrochemical charge storage of MXene electrodes

Nitrogen and Oxygen Dual-doped Porous Carbon from Nature Macromolecular Chitosan for Fast and Stable Zinc-ion Hybrid Supercapacitors

Multiple Redox‐Active Cyano‐Substituted Organic Compound Integrated with MXene Nanosheets for High‐Performance Flexible Aqueous Zn‐Ion Battery

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