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Caterpillar-like 3D graphene nanoscrolls@CNTs hybrids decorated with Co-doped MoSe_(2)nanosheets for electrocatalytic hydrogen evolution

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Journal of Materials Science & Technology 2023年第5期136卷 43-53页

作者： Hao Luo Hongfei Gao Xudong Zhang Fan Yang Chen Liu Kewei Xu Dagang Guo State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China Center for High Performance Computing Network Information CenterXi’an Jiaotong UniversityXi’an 710049China

Hydrogen is a clean and flexible energy carrier that has the promising to satisfy urgent demands of the energy crisis and environmental *** hydrogen evolution reaction(HER),a critical half-reaction in water splitting,is one of the greenest and most common methods to obtain high-purity *** preeminent activity and stability electrocatalysts for hydrogen precipitation reac-tion(HER)to reduce energy consumption is of great essential.3D carbon-based materials have attracted widespread concern as the potential scaffolds of highly active and durable electrocatalysts for *** boost the HER activity and prolong the lifespan of electrocatalysts,multifarious 3D carbon architectures make an appearance to be engineered for accelerating electronic/mass transfer and maximizing the expo-sure of active ***,we designed and fabricated high-performance electrocatalysts based on a spe-cial caterpillar-like 3D graphene nanoscrolls@CNTs(GNS@CNTs)scaffold decorated with Co-doped MoSe_(2)nanosheets for *** the caterpillar-like hierarchical structure,CNTs were seamlessly co-bonded and dilated the interlayer and outer spacing of GNS through CVD growth technology,and nickel nanoparticles were covered by the CNTs *** advantage of the plentiful hierarchical pore,larger specific surface area,and higher chemical stability of the caterpillar-like structure,the catalysts exhibited enhanced elec-trocatalytic properties than some existing data *** functional theory calculations showed that the encapsulated nickel nanoparticle could tune the electronic structure of the outer anchored Co-doped MoSe_(2)and optimize itsG of H∗adsorption by electron traversing effect and doping *** indicate that caterpillar-like GNS@CNT is an ideal scaffold f or anchoring actives substance and is suit-able for high-efficient *** study provides new insights for designing hierarchical carbon composite nanostructures for catalysts,sensors,

关键词： Electron traversing effect 3D graphene graphene nanoscrolls CNT MoSe_(2),Hydrogen evolution reaction

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Embedding Co3O4 nanoparticles into graphene nanoscrolls as anode for lithium ion batteries with superior capacity and outstanding cycling stability

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Progress in Natural Science:Materials International 2018年第2期28卷 212-217页

作者： Zhigang Zhang Lianlian Gao Yanfeng Dong Jinping Zhao Zhongshuai Wu School of chemistry & chemical engineering Shandong University of Technology Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences

CoOis a promising high-performance anode for lithium ion batteries(LIBs), but suffers from unsatisfied cyclability originating duo to low electrical conductivity and large volume expansion during charge and discharge process. Herein, we successfully constructed the CoOnanoparticles embedded into graphene nanoscrolls(GNSs) as advanced anode for high-performance LIBs with large capacity and exceptional cyclability. The onedimensional(1 D) CoO/GNSs were synthesized via liquid nitrogen cold quenching of large-size graphene oxide nanosheets and sodium citrate(SC) modified CoOnanoparticles, followed by freeze drying and annealing at400 °C for 2 h in nitrogen atmosphere. Benefiting from the interconnected porous network constructed by 1 D CoO/GNSs for fast electron transfer and rapid ion diffusion, and wrinkled graphene shell for significantly alleviating the huge volume expansion of CoOduring lithiation and delithiation. The resultant CoO/GNSs exhibited ultrahigh reversible capacity of 1200 mAh gat 0.1 C, outperforming most reported ***, they showed high rate capability of 600 m Ah g-1 at 5 C, and outstanding cycling stability with a high capacity retention of 90% after 500 cycles. Therefore, this developed strategy could be extended as an universal and scalable approach for intergrating various metal oxide materials into GNSs for energy storage and conversion applications.

关键词： graphene nanoscrolls Co3O4 Anode Lithium ion batteries Energy storage

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Nitrogen-doped holey graphene nanoscrolls for high-energy and high-power supercapacitors

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Chinese Chemical Letters 2021年第2期32卷 914-917页

作者： Feng Su Shuanghao Zheng Fangyan Liu Xiong Zhang Fangyuan Su Zhong-Shuai Wu Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing J00049China Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023China

Porous structure and heteroatom doping are two key parameters for significantly boosting the capacitive performance of graphene-based ***,we report a facile approach to prepare onedimensional(ID) nitrogen-doped holey graphene nanoscrolls(NHGNSs) through cold quenching treatment of two-dimensional graphene oxide sheets,followed by thermal annealing in the successive atmosphere of NH3 and *** from the synergy of the unique 1D tubular morphology,abundant nanoholes and nitrogen doping,the NHGNSs exhibit a high specific capacitance of 126 F/g at 1 A/g in ionic liquid electrolyte and excellent rate capability with 81% of the capacitance retained at 20 A/***,the fabricated symmetric supercapacitors based on NHGNSs achieve both high energy density of 53.5 Wh/kg at 875 W/kg and high power density of 17.5 kW/kg at 43.4 Wh/*** simple synthetic process and superior electrochemical performance suggest the great potential of NHGNSs for supercapacitor application.

关键词： graphene nanoscrolls Nitrogen doping Holey grapheme Supercapacitors Ionic liquid

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