Journal ArticleDOI
Benzoxazole and benzimidazole heterocycle-grafted graphene for high-performance supercapacitor electrodes
Wei Ai,Wei Ai,Weiwei Zhou,Zhuzhu Du,Yaping Du,Hua Zhang,Xingtao Jia,Linghai Xie,Mingdong Yi,Ting Yu,Wei Huang +10 more
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TLDR
An efficient method for the preparation of benzoxazole and benzimidazole covalently grafted graphene and their application as high performance electrode materials for supercapacitors is reported in this paper.Abstract:
An efficient method for the preparation of benzoxazole and benzimidazole covalently grafted graphene and their application as high performance electrode materials for supercapacitors is reported. The synthesis of such covalently functionalized graphene materials first involves a cyclization reaction of carboxylic groups on graphene oxide with the hydroxyl and aminos groups on o-aminophenol and o-phenylenediamine, and subsequent reduction by hydrazine. Results of Fourier transformed infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and thermogravimetric analysis (TGA) have confirmed that the covalent functionalization of graphene is achieved through the formation of benzoxazole and benzimidazole on the graphene sheets. The functionalized graphene materials are revealed to consist of corrugation and scrolling morphologies with less aggregation, indicating the effectiveness of functionalization in preventing restacking/aggregation of the graphene sheets. Furthermore, when applied as supercapacitor electrodes, the functionalized graphene materials exhibit good electrochemical performances in terms of high specific capacitance (730 and 781 F g−1 for benzoxazole and benzimidazole grafted graphene, respectively, at a current density of 0.1 A g−1) and good cycling stability, implying their potential for energy storage applications.read more
Citations
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Nitrogen and Sulfur Codoped Graphene: Multifunctional Electrode Materials for High‐Performance Li‐Ion Batteries and Oxygen Reduction Reaction
Wei Ai,Zhimin Luo,Jian Jiang,Jianhui Zhu,Zhuzhu Du,Zhanxi Fan,Linghai Xie,Hua Zhang,Wei Huang,Wei Huang,Ting Yu,Ting Yu +11 more
TL;DR: N and S codoping of graphene is realized by a novel approach: covalent functionalization of graphene oxide using 2-aminothiophenol as a source of both N and S followed by thermal treatment.
Journal ArticleDOI
Materials Design and System Construction for Conventional and New-Concept Supercapacitors
TL;DR: This review provides a comprehensive summary of recent progress on electrode materials design and burgeoning devices constructions for high‐performance supercapacitors.
Journal ArticleDOI
Controllable Design of MoS2 Nanosheets Anchored on Nitrogen-Doped Graphene: Toward Fast Sodium Storage by Tunable Pseudocapacitance
Xin Xu,Xin Xu,Ruisheng Zhao,Wei Ai,Wei Ai,Bo Chen,Hongfang Du,Lishu Wu,Hua Zhang,Wei Huang,Wei Huang,Ting Yu +11 more
TL;DR: A simple solvothermal method to synthesize a series of MoS2 nanosheets@nitrogen-doped graphene composites is developed, demonstrating the significance in surface-controlled pseudocapacitance contribution at the high rate and offering some meaningful preparation and investigation experiences for designing electrode materials for commercial sodium-ion batteries with favorable performance.
Journal ArticleDOI
Facile synthesis of fluorinated polydopamine/chitosan/reduced graphene oxide composite aerogel for efficient oil/water separation
TL;DR: In this article, a facile and environmentally-friendly approach was developed to fabricate reduced graphene oxide/polydopamine composite aerogel reinforced by chitosan and modified by 1H,1H, 2H,2H-perfluorodecanethiol (PFDT).
Journal ArticleDOI
Graphene Foam Developed with a Novel Two-Step Technique for Low and High Strains and Pressure-Sensing Applications
TL;DR: Freestanding, mechanically stable, and highly electrically conductive graphene foam (GF) is formed with a two-step facile, adaptable, and scalable technique.
References
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Daniela C. Marcano,Dmitry V. Kosynkin,Jacob M. Berlin,Alexander Sinitskii,Zhengzong Sun,Alexander S. Slesarev,Lawrence B. Alemany,Wei Lu,James M. Tour +8 more
TL;DR: An improved method for the preparation of graphene oxide (GO) is described, finding that excluding the NaNO(3), increasing the amount of KMnO(4), and performing the reaction in a 9:1 mixture of H(2)SO(4)/H(3)PO(4) improves the efficiency of the oxidation process.
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Nanostructured materials for advanced energy conversion and storage devices
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TL;DR: This review describes some recent developments in the discovery of nanoelectrolytes and nanoeLECTrodes for lithium batteries, fuel cells and supercapacitors and the advantages and disadvantages of the nanoscale in materials design for such devices.
Journal ArticleDOI
Graphene-Based Ultracapacitors
TL;DR: CMG materials are made from 1-atom thick sheets of carbon, functionalized as needed, and here their performance in an ultracapacitor cell is demonstrated, illustrating the exciting potential for high performance, electrical energy storage devices based on this new class of carbon material.
Journal ArticleDOI
Carbon-based Supercapacitors Produced by Activation of Graphene
Yanwu Zhu,Shanthi Murali,Meryl D. Stoller,K. J. Ganesh,Weiwei Cai,Paulo J. Ferreira,Adam Pirkle,Robert M. Wallace,Katie A. Cychosz,Matthias Thommes,Dong Su,Eric A. Stach,Rodney S. Ruoff +12 more
TL;DR: This work synthesized a porous carbon with a Brunauer-Emmett-Teller surface area, a high electrical conductivity, and a low oxygen and hydrogen content that has high values of gravimetric capacitance and energy density with organic and ionic liquid electrolytes.
Journal ArticleDOI
Carbon materials for the electrochemical storage of energy in capacitors
TL;DR: In this article, different types of capacitors with a pure electrostatic attraction and/or pseudocapacitance effects are presented, and their performance in various electrolytes is studied taking into account the different range of operating voltage (1V for aqueous and 3 V for aprotic solutions).