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富含V^(4+)的V_(2)O_(5)/碳气凝胶纳米复合材料用于高性能超级电容器

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Science China Materials 2022年第7期65卷 1797-1804页

作者：毕文超邓声远汤海莎刘源沈军高国华吴广明 MAtif MS AlSalhi 曹国忠 Departments of Physics College of ScienceUniversity of Shanghai for Science and TechnologyShanghai 200093China Shanghai Key Laboratory of Special Artificial Microstructure School of Physics Science and EngineeringTongji UniversityShanghai 200092China Department of Materials Science and Engineering University of WashingtonSeattleWA 98195-2120United States Research Chair on Laser Diagnosis of Cancers Department of Physics and AstronomyCollege of ScienceKing Saud University11451RiyadhSaudi Arabia Department of Physics and Astronomy College of ScienceKing Saud University11451RiyadhSaudi Arabia

本文利用原位水解-聚合的方法合成了富含V^(4+)的V_(2)O_(5)/碳气凝胶纳米复合材料(V^(4+)-V_(2)O_(5)/CA),用于超级电容器的电极.在合成过程中,碳气凝胶(CA)促进了无序氧化钒的沉积并催化富含V^(4+)的V_(2)O_(5)在较低的温度下结晶.由... 详细信息

本文利用原位水解-聚合的方法合成了富含V^(4+)的V_(2)O_(5)/碳气凝胶纳米复合材料(V^(4+)-V_(2)O_(5)/CA),用于超级电容器的电极.在合成过程中,碳气凝胶(CA)促进了无序氧化钒的沉积并催化富含V^(4+)的V_(2)O_(5)在较低的温度下结晶.由于V_(2)O_(5)纳米片均匀地分布在CA内,这种特殊结构为电化学储能反应提供了大比表面积和更多的活性位点;CA协同提高了电极材料的导电性和结构稳定性;丰富的V^(4+)增强了V_(2)O_(5)原有的导电性、促进了离子扩散速率并催化了电化学反应.因此,基于V^(4+)-V_(2)O_(5)/CA的超级电容器获得了高比容量(在0.5 A g^(-1)下比容量达405 F g^(-1))、高能量密度(56 W h kg^(-1),功率密度为250 W kg^(-1))和长循环寿命(40,000次循环后比容量保持率为96%).

关键词： V_(2)O_(5) V^(4+) carbon aerogel kinetics supercapacitor

Cellulose nanofiber-derived carbon aerogel for advanced room-temperature sodium–sulfur batteries

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carbon Energy 2023年第1期5卷 1-15页

作者： Wu Yang Wang Yang Ren Zou Yongfa Huang Haihong Lai Zehong Chen Xinwen Peng State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhouChina

Room-temperature sodium–sulfur(RT/Na–S)batteries are regarded as promising large-scale stationary energy storage systems owing to their high energy density and low cost as well as the earth-abundant reserves of sodium and sulfur.However,the diffusion of polysulfides and sluggish kinetics of conversion reactions are still major challenges for their application.Herein,we developed a powerful and functional separator to inhibit the shuttle effect by coating a lightweight three-dimensional cellulose nanofiber-derived carbon aerogel on a glass fiber separator(denoted NSCA@GF).The hierarchical porous structures,favorable electronic conductivity,and three-dimensional interconnected network of N,S-codoped carbon aerogel endow a multifunctional separator with strong polysulfide anchoring capability and fast reaction kinetics of polysulfide conversion,which can act as the barrier layer and an expanded current collector to increase sulfur utilization.Moreover,the hetero-doped N/S sites are believed to strengthen polysulfide anchoring capability via chemisorption and accelerate the redox kinetics of polysulfide conversion,which is confirmed from experimental and theoretical results.As a result,the assembled Na–S coin cells with the NSCA@GF separator showed a high reversible capacity(788.8 mAh g^(−1) at 0.1 C after 100 cycles)and superior cycling stability(only 0.059%capacity decay per cycle over 1000 cycles at 1 C),thereby demonstrating the significant potential for application in high-performance RT/Na–S batteries.

关键词： carbon aerogel cellulose nanofiber N,S codoping redox kinetics sodium–sulfur batteries

Environmentally Friendly and Multifunctional Shaddock Peel-Based carbon aerogel for Thermal-Insulation and Microwave Absorption

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Nano-Micro Letters 2021年第7期13卷 28-41页

作者： Weihua Gu Jiaqi Sheng Qianqian Huang Gehuan Wang Jiabin Chen Guangbin Ji College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China Shenyang Aircraft Design Institute Yangzhou Collaborative Innovation Research Institute Co. LtdShenyang 225002People’s Republic of China

Eco-friendly electromagnetic wave absorbing materials with excellent thermal infrared stealth property,heat-insulating ability and compression resistance are highly attractive in practical applications.Meeting the aforesaid requirements simultaneously is a formidable challenge.Herein,ultra-light carbon aerogels were fabricated via fresh shaddock peel by facile freeze-drying method and calcination process,forming porous network architecture.With the heating platform temperature of 70℃,the upper surface temperatures of the as-prepared carbon aerogel present a slow upward trend.The color of the sample surface in thermal infrared images is similar to that of the surroundings.With the maximum compressive stress of 2.435 kPa,the carbon aerogels can provide favorable endurance.The shaddock peel-based carbon aerogels possess the minimum reflection loss value(RLmin)of−29.50 dB in X band.Meanwhile,the effective absorption bandwidth covers 5.80 GHz at a relatively thin thickness of only 1.7 mm.With the detection theta of 0°,the maximum radar cross-sectional(RCS)reduction values of 16.28 dB m^(2) can be achieved.Theoretical simulations of RCS have aroused extensive interest owing to their ingenious design and time-saving feature.This work paves the way for preparing multi-functional microwave absorbers derived from biomass raw materials under the guidance of RCS simulations.

关键词： Microwave absorption Thermal insulation carbon aerogel Radar cross-sectional simulation Multi-function

FeCo alloy/N,S co-doped carbon aerogel derived from directionalcasting cellulose nanofibers for rechargeable liquid flow and flexible Zn–air batteries

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Nano Research 2023年第5期16卷 6870-6880页

作者： Yiwen Zhang Xifeng Zhang Yuting Li Juan Wang Sibudjing Kawi Qin Zhong School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094China Department of Chemical and Biomolecular Engineering National University of SingaporeSingapore 117582Singapore

Bifunctional oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)electrocatalysts with the advantages of excellent activity and stability are the vital components of air cathodes for rechargeable Zn–air batteries(ZABs).Herein,the carbon aerogel with honeycomb-like structure,N and S double doping and loaded with FeCo alloy nanoparticles(NSCA/FeCo)was prepared successfully as cathodes for rechargeable liquid flow and two-dimensional flexible ZABs by clever directional casting.The interaction between the bimetallic alloy and the double-doped carbon with specifical structure,large surface,great conductivity endows NSCA/FeCo with effective ORR/OER active sites and small charge/mass transport barrier,thus achieving outstanding bifunctional catalytic performance.The NSCA/FeCo displays a half-wave potential of+0.85 V(vs.reversible hydrogen electrode(RHE))for ORR and an overpotential of 335 mV at a current density of 10 mA·cm^(−2)for OER,which is even comparable to the performance of noble-metal catalysts in relevant fields(Pt/C for ORR and RuO_(2)for OER).Consequently,the rechargeable liquid flow ZABs assembled with NSCA/FeCo showed excellent performance(maximum power density:132.0 mW·cm^(−2),specific capacity:804.5 Wh·kg^(−1)at 10 mA·cm^(−2),charge and discharge cycle stability of more than 250 cycles).Furthermore,the flexible NSCA/FeCo-based ZABs have a maximum power density of 43.0 mW·cm^(−2),outstanding charging–discharge stability of more than 450 cycles,exhibit good flexibility under different bending conditions.Therefore,this work has provided an efficient bifunctional electrocatalyst for OER/ORR and a promising strategy of air cathodes for rechargeable and wearable ZABs.

关键词： carbon aerogel bifunctional electrocatalyst FeCo alloy directional freeze-casting rechargeable zinc–air batteries flexible batteries

A hybrid carbon aerogel with both aligned and interconnected pores as interlayer for high-performance lithium-sulfur batteries

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Nano Research 2016年第12期9卷 3735-3746页

作者： Mingkai Liu Zhibin Yang Hao Sun Chao Lai Xinsheng Zhao Huisheng Peng Tianxi Liu School of Chemistry and Chemical Engineering Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials Jiangsu Normal University Xuzhou 221116 China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Laboratory of Advanced Materials Fudan University Shanghai 200438 China School of Physics and Electronic Engineering Jiangsu Normal University Xuzhou 221116 China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai 201620 China

The soluble nature of polysulfide species created on the sulfur electrode has severely hampered the electrochemical performance of lithium-sulfur （Li-S） batteries. Trapping and anchoring polysulfides are promising approaches for overcoming this issue. In this work, a mechanically robust, electrically conductive hybrid carbon aerogel （HCA） with aligned and interconnected pores was created and investigated as an interlayer for Li-S batteries. The hierarchical cross-linked networks constructed by graphene sheets and carbon nanotubes can act as an ＂internet＂ to capture the polysulfide, while the micro- and nano-pores inside the aerogel can facilitate quick penetration of the electrolyte and rapid transport of lithium ions. As advantages of the unique structure and excellent accommodation of the volume change of the active materials, a high specific capacity of 1,309 mAh.g-1 at 0.2 C was achieved for the assembled Li-S battery, coupled with good rate performance and long-term cycling stability （78% capacity retention after 600 cycles at 4 C）.

关键词： lithium-sulfur battery carbon aerogel interlayer aligned and interconnectedpores trapped polysulfide

Defect reduction to enhance the mechanical strength of nanocellulose carbon aerogel

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Chinese Chemical Letters 2024年第1期35卷 492-498页

作者： Haihong Lai Zehong Chen Hao Zhuo Yijie Hu Xuan Zhao Jiwang Yi Hongzhi Zheng Ge Shi Yifan Tong Ling Meng Xinwen Peng Linxin Zhong State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510641China Huangpu Hydrogen Energy Innovation Center/Guangzhou Key Laboratory for Clean Energy and Materials School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006China

carbon aerogels prepared from renewable nano building blocks are rising-star materials and hold great promise in many fields.However,various defects formed during carbonization at high temperature disfavor the stress transfer and thus the fabrication of flexible carbon aerogel from renewable nano building blocks.Herein,a structural defect-reducing strategy is proposed by altering the pyrolysis route of cellulose nanofiber.Inorganic salt that inhibits the generation of tar volatilization during pyrolysis can prevent the formation of various structural defects.Microstructure with fewer defects can reduce stress concentration and remarkably enhance the compressibility of carbon aerogel,thus increasing the maximum stress retention of carbon aerogel.The carbon aerogel also has high stress sensor sensitivity and excellent temperature coefficient of resistance.The structural defect-reducing strategy will pave a new way to fabricate high-strength carbon materials for various fields.

关键词： Biomass Cellulose nanofiber Pyrolysis Renewable carbon aerogel

Ni single-atom sites supported on carbon aerogel for highly efficient electroreduction of carbon dioxide with industrial current densities

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eScience 2022年第3期2卷 295-303页

作者： Hui Guo Duan-Hui Si Hong-Jing Zhu Qiu-Xia Li Yuan-Biao Huang Rong Cao State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou350002China University of Chinese Academy of Sciences Beijing100049China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou Fujian350108China

Finding highly efficient electrocatalysts for the CO_(2)electroreduction reactions(CO_(2)RR)that have high selectivity and appreciable current density to meet commercial application standards remains a challenge.Because their reduction potentials are similar to that of the associated competitive hydrogen evolution reaction and the CO_(2)activation kinetics are sluggish.Although single-atom catalysts(SACs)with high atom efficiency are one class of promising candidates for the CO_(2)RR to produce CO,single-atom active sites supported on microporous carbons are not fully exposed to substrates and thus lead to low current density.carbon aerogels with interconnected channels and macropores can facilitate mass transport.But few reports describe utilizing them as supports to anchor SACs for efficient electrocatalysis.Herein,N-doped carbon aerogels supporting Ni single atomic catalyst sites(denoted as Ni-NCA-X,X¼10,20)were fabricated by pyrolyzing Ni/Zn bimetallic zeolitic imidazolate framework(Ni/Zn-ZIF-8)/carboxymethylcellulose composite gels.Owing to abundant hierarchical micro-,meso-,and macropores and high CO_(2)adsorption,the Ni single active sites in the optimal Ni-NCA-10 were readily accessible for the electrolyte and CO_(2)molecules and thus achieved an industrial-level CO partial current density of 226 mA cm?2,a high CO Faradaic efficiency of 95.6%at?1.0 V vs.the reversible hydrogen electrode,and a large turnover frequency of 271810 h?1 in a flow-cell reactor at?1.0 V.Such excellent CO_(2)RR performance makes Ni-NCA-10 a rare state-of-the-art electrocatalyst for CO_(2)-to-CO conversion.This work provides an effective strategy for designing highly efficient electrocatalysts toward the CO_(2)RR to achieve industrial current density via anchoring single-atom sites on carbon aerogels.

关键词： carbon aerogel ZIF-8 Single-atom catalyst CO_(2)electrocatalysis CO

Mild and Low-Cost Synthetic Process for Monodispersive Platinum Nanoparitcles on carbon aerogel

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Mild and Low-Cost Synthetic Process for Monodispersive Plati...

Cuprous oxide/copper oxide interpenetrated into ordered mesoporous cellulose-based carbon aerogels for efficient photocatalytic degradation of methylene blue

2014中国功能材料科技与产业高层论坛

作者： Feng Li Gaoyang Zhao Ying Yang Gary Pattrick Richard Moutloali School of Material Science and Engineering Xi'an University of Technology College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics

A mild synthetic process using formic acid as the reduction agent was applied to prepare 40 wt%Pt/carbon aerogel（CA）electrocatalyst.The as-prepared sample was characterized by transmission electron microscopy（TEM）and electrochemical measurements.The results exhibit Pt nanoparticles with narrow particle size distribution are dispersed throughout carbon aerogel structure.Moreover,the Pt/CA catalyst has smaller Pt nanoparticle mean size than Johnson Matthey HiSpecTM 4000（JM4000）.The electrochemical measurement results indicate that the Pt/CA catalyst with Pt loading of 40 wt%possesses similarelectrochemical surface area（ESA）value and oxygen reduction reaction（ORR）activity as JM4000.

关键词： carbon aerogel PEM fuel cells Catalyst Platinum nanoparticles

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Frontiers of Chemical Science and Engineering 2023年第7期17卷 918-929页

作者： Rui Cui Dongnv Jin Gaojie Jiao Zhendong Liu Jiliang Ma Runcang Sun Liaoning Key Lab of Lignocellulose Chemistry and Biomaterials Liaoning Collaborative Innovation Center for Lignocellulosic BiorefineryCollege of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian 116034China

The casual discharge of dyes from industrial settings has seriously polluted global water systems.Owing to the abundance of biomass resources,preparing photocatalysts for photocatalytic degradation of dyes is significant;however,it still remains challenging.In this work,a cuprous oxide/copper oxide composite was interpenetrated onto carbon nanosheets of cellulose-based flexible carbon aerogels(Cu_(2)O/CuO@CAx)via a simple freeze-drying-calcination method.The introduction of the carbon aerogel effectively prevents the aggregation of the cuprous oxide/copper oxide composite.In addition,Cu_(2)O/CuO@CA0.2 has a larger specific surface area,stronger charge transfer capacity,and lower recombination rate of photogenerated carriers than copper oxide.Moreover,Cu_(2)O/CuO@CA0.2 exhibited high photocatalytic activity in decomposing methylene blue,with a degradation rate reaching up to 99.09% in 60 min.The active oxidation species in the photocatalytic degradation process were systematically investigated by electron spin resonance characterization and poisoning experiments,among which singlet oxygen played a major role.In conclusion,this work provides an effective method for preparing photocatalysts using biomass resources in combination with different metal oxides.It also promotes the development of photocatalytic degradation of dyes.

关键词： carbon aerogel photocatalysis dye degradation biomass cuprous oxide copper oxide