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One-step growth of the interconnected carbon nanotubes/graphene hybrids from cuttlebone-derived bi-functional catalyst for lithium-ion batteries

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Journal of Materials Science & Technology 2023年第18期149卷 205-213页

作者： Yan Zhong Kuan Deng Jie Zheng Tingting Zhang Peng Liu Xingbin Lv Wen Tian Junyi Ji School of Chemical Engineering Sichuan UniversityChengdu 610065China College of Chemistry and Environment Southwest Minzu UniversityChengdu 610041China State Key Laboratory of Polymer Materials Engineering Sichuan UniversityChengdu 610065China

Carbon nanotubes/graphene hybrid materials with excellent physicochemical properties can be widely ap-plied in the fields of energy storage,electrocatalysis,sensing,etc.Reducing the self-stacking and achiev-ing covalent interaction between carbon nanotubes and graphene are important to ensure a stable hi-erarchical architecture and effective mass transfer.Herein,we propose a one-step strategy to synthesize 3D interconnected carbon nanotubes/graphene hybrids on the easy-to-remove biomass-derived substrate.The calcined natural cuttlebone as bi-functional catalyst precursor can simultaneously grow carbon nan-otubes and graphene by one-step chemical vapor deposition without the addition of extra metal catalysts,while the interconnected structure can act as the porous template for graphene growth.The simultane-ous growth process can obtain covalent bonding between carbon nanotubes and graphene,while the crystalline quality and interlayer space can be adjusted by different carbon sources and growth parame-ters(e.g.,temperature).The one-step grown carbon nanotubes/graphene hybrids with seamless interfaces and hierarchical interconnected 3D structure can effectively enhance the electron transfer as well as the electrolyte infiltration efficiency.When utilized as lithium-ion batteries(LIBs)anode,a high specific ca-pacity(544 mAh g^(-1) at 0.1 A g^(-1)),good rate capability(200 mAh g^(-1) at 6.4 A g^(-1) with an ultrashort charge time of 113 s),and excellent cyclic stability can be achieved.This simple and one-step carbon nanotubes/graphene hybrids fabrication strategy can be easily scale-up and applied in various fields.

关键词： Cuttlebone biomass Carbon nanotube/graphene hetero-junction bi-functional catalyst Chemical vapor deposition Lithium-ion batteries

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Ultrasmall AuPd nanoclusters on amine-functionalized carbon blacks as high-performance bi-functional catalysts for ethanol electrooxidation and formic acid dehydrogenation

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Journal of Energy Chemistry 2022年第5期31卷 556-563页

作者： Yuhuan Cui Ming Zhao Yining Zou Junyu Zhang Jiuhui Han Zhili Wang Qing Jiang Key Laboratory of Automobile Materials Ministry of EducationSchool of Materials Science and EngineeringJilin UniversityChangchun 130022JilinChina Frontier Research Institute for Interdisciplinary Sciences(FRIS) Tohoku UniversitySendai 980-8578Japan

The synthesis of ultrasmall metal nanoclusters(NCs) with high catalytic activities is of great importance for the development of clean and renewable energy technologies but remains a challenge. Here we report a facile wet-chemical method to prepare ~1.0 nm Au Pd NCs supported on amine-functionalized carbon blacks. The Au Pd NCs exhibit a specific activity of 5.98 mA cm_(AuPd)^(-2)and mass activity of 5.25 A mg_(auPd)^(-1) for ethanol electrooxidation, which are far better than those of commercial Pd/C catalysts(1.74 mAcm_(AuPd)^(-2) and 0.54 A mg_(Pd)^(-1) ). For formic acid dehydrogenation, the Au Pd NCs have an initial turn over frequency of 49339 h^(-1) at 298 K without any additive, which is much higher than those obtained for most of reported Au Pd catalysts. The reported synthesis may represent a facile and low-cost approach to prepare other ultrasmall metal NCs with high catalytic activities for various applications.

关键词： Ethanol electrooxidation Formic acid dehydrogenation AuPd Nanoclusters bi-functional catalyst

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Conversion of phenol to cyclohexane in the aqueous phase over Ni/zeolite bi-functional catalysts

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Frontiers of Chemical Science and Engineering 2021年第2期15卷 288-298页

作者： Jimei Zhang Fuping Tian Junwen Chen Yanchun Shi Hongbin Cao Pengge Ning Shanshan Sun Yongbing Xie School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China College of Chemistry Dalian University of TechnologyDalian 116024China State Key Laboratory of Catalytic Materials and Reaction Engineering Research Institute of Petroleum ProcessingSINOPECBeijing 100083China

A series of Ni/HZSM-5 and Ni/HIM-5 bi-functional catalysts were synthesized and applied to the aqueous-phase hydrodeoxygenation(HDO)of phenol.The Ni dispersibility and particle sizes were shown to be directly related to the porosity and crystal sizes of the parent zeolites,which further influenced the catalytic performances.The large pores and small crystal sizes of the parent zeolites were beneficial for dispersing Ni and forming small Ni particles,and the corresponding Ni/zeolite catalyst exhibited a higher phenol conversion and selectivity towards hydrocarbons.Importantly,the Ni/HIM-5 bi-functional catalyst exhibited a high activity(98.3%)and high selectivity for hydrocarbons(98.8%)when heated at 220°C for 1 h and is thus a new potential catalyst for the HDO of phenolics to form hydrocarbons in the aqueous phase.

关键词： aqueous-phase hydrodeoxygenation phenol hydrocarbons Ni/HIM-5 bi-functional catalyst

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3D hollow sphere Co_3O_4/MnO_2-CNTs:Its high-performance bi-functional cathode catalysis and application in rechargeable zinc-air battery

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Green Energy & Environment 2017年第3期2卷 316-328页

作者： Xuemei Li Nengneng Xu Haoran Li Min Wang Lei Zhang Jinli Qiao College of Environmental Science and Engineering Donghua Universty Energy Mining & Environment National Research Council of Canada

There has been a continuous need for high active, excellently durable and low-cost electrocatalysts for rechargeable zinc-air batteries. Among many low-cost metal based candidates, transition metal oxides with the CNTs composite have gained increasing attention. In this paper, the 3-D hollow sphere MnO_2 nanotube-supported Co_3O_4 nanoparticles and its carbon nanotubes hybrid material(Co_3 O_4/MnO_2-CNTs) have been synthesized via a simple co-precipitation method combined with post-heat treatment. The morphology and composition of the catalysts are thoroughly analyzed through SEM, TEM, TEM-mapping, XRD, EDX and XPS. In comparison with the commercial 20% Pt/C, Co_3O_4/MnO_2,bare MnO_2 nanotubes and CNTs, the hybrid Co_3O_4/MnO_2-CNTs-350 exhibits perfect bi-functional catalytic activity toward oxygen reduction reaction and oxygen evolution reaction under alkaline condition(0.1 M KOH). Therefore, high cell performances are achieved which result in an appropriate open circuit voltage(～1.47 V),a high discharge peak power density(340 mW cm^(-2)) and a large specific capacity(775 mAh g^(-1) at 10 mA cm^(-2)) for the primary Zn-air battery, a small charge-discharge voltage gap and a high cycle-life(504 cycles at 10 mA cm^(-2) with 10 min per cycle) for the rechargeable Zn-air battery. In particular, the simple synthesis method is suitable for a large-scale production of this bifunctional material due to a green, cost effective and readily available process.

关键词： bi-functional catalyst Oxygen reduction reaction Oxygen evolution reaction Activity and stability Rechargeable zinc-air battery

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