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Electrodeposited 3D hierarchical NiFe microflowers assembled from nanosheets robust for the selective electrooxidation of furfuryl alcohol

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Green Energy & Environment 2023年第3期8卷 874-882页

作者： biying liu Man Zhang Yaoyu liu Yuchen Wang Kai Yan Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology School of Environmental Science and EngineeringSun Yat-sen University135 Xingang Xi RoadGuangzhou510275China

A robust and green strategy for the selective upgrading of biomass-derived platform chemicals towards highly valuable products is important for the sustainable ***,the efficient electrocatalytic oxidation of biomass-derived furfuryl alcohol(FFA)into furoic acid(FurAc)catalyzed by the electrodeposited non-precious NiFe microflowers was successfully reached under the low temperature and ambient *** 3D hierarchical NiFe microflowers assembled from ultrathin nanosheets were controllably synthesized by the electrodeposition method and uniformly grown on carbon fiber paper(CFP).Electrochemical analysis confirmed that NiFe nanosheets more preferred in the selective oxidation of FFA(FFAOR)than oxygen evolution reaction(OER).The linear sweep voltammetry(LSV)in FFAOR displayed a clear decrease towards lower potential,resulting in 30 mV reduction of overpotential at 20 mA cm^(-2) compared with that of *** optimal catalyst Ni_(1)Fe_(2) nanosheets exhibited the highest selectivity of FurAc(94.0%)and 81.4%conversion of FFA within 3 ***,the influence of various reaction parameters on FFAOR was then explored in *** that,the reaction pathway was investigated and rationally *** outstanding performance for FFAOR can be ascribed to the unique structure of 3D flower-like NiFe nanosheets and oxygen vacancies,resulting in large exposure of active sites,faster electron transfer and enhanced adsorption of *** findings highlight a facile and convenient mean with a promising green future,which is promising for processing of various biomass-derived platform chemicals into value-added products.

关键词： Electrodeposition Microflowers assembled by nanosheets NiOOH Oxygen vacancies Electrochemical oxidation Furfuryl alcohol Furoic acid

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Efficient electrooxidation of biomass-derived aldehydes over ultrathin Ni V-layered double hydroxides films

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Journal of Energy Chemistry 2023年第3期78卷 412-421,I0012页

作者： biying liu Zhikeng Zheng Yaoyu liu Man Zhang Yuchen Wang Yangyang Wan Kai Yan Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology School of Environmental Science and EngineeringSun Yat-sen UniversityGuangzhou 510275GuangdongChina Guangdong Laboratory for Lingnan Modern Agriculture South China Agricultural UniversityGuangzhou 510642GuangdongChina Institute for Advanced Materials School of Materials Science and EngineeringJiangsu UniversityZhenjiang 212013JiangsuChina

Selective upgrading of C=O bonds to afford carboxylic acid is significant for the petrochemical industry and biomass *** we declared the efficient electrooxidation of biomass-derived aldehydes family over NiV-layered double hydroxides(LDHs) thin *** studies confirmed the hydroxyl active intermediate(-OH*) generated on the surface of NiV-LDHs films by employing electrochemical impedance spectroscopy and the electron paramagnetic resonance *** using advanced techniques,e.g.,extended X-ray absorption fine structure and high-angle annular dark-field scanning transmission electron microscopy,NiV-LDHs films with 2.6 nm could expose larger specific surface *** benzaldehyde as a model,high current density of 200 mA cm^(-2)at 1.8 V ***,81.1% conversion,77.6% yield of benzoic acid and 90.8% Faradaic efficiency were reached,which was superior to most of previous *** DFT analysis was well matched with experimental findings and documented that NiV-LDHs had high adsorption capacity for the aldehydes to suppress the side reaction,and the aldehydes were oxidized by the electrophilic hydroxyl radicals formed on *** findings offer a universal strategy for the robust upgrading of diverse biomass-derived platform chemicals.

关键词： NiV-LDHs Films Hydroxyl radicals Electrocatalytic oxidation Biomass-derived aldehydes

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In situ growth of hydrophilic nickel-cobalt layered double hydroxides nanosheets on biomass waste-derived porous carbon for high-performance hybrid supercapacitors

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Green Chemical Engineering 2022年第1期3卷 55-63页

作者： Yuchen Wang Yaoyu liu Zuo Chen Man Zhang biying liu Zhenhao Xu Kai Yan School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou510275China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Guangzhou510275China

Rational design and cost-effective fabrication of layered double hydroxides(LDHs)nanosheets with extraordinary electrochemical performance is a key challenge for hybrid supercapacitors(HSCs).Herein,we report a facile in situ growth methodology to eco-friendly synthesize hydrophilic Ni Co-LDHs nanosheets on biomass waste-derived porous carbon(BC)for robust high-performance HSC *** in situ growth process under ultrasonication realizes the rational arrangement of Ni Co-LDHs nanosheets on the surface of BC,which effectively increases the specific surface area,promotes the electronic conductivity and enhances the wettability of Ni Co-LDHs nanosheets without affecting their thickness *** the beneficial effects of ultrathin thickness of LDHs nanosheets(6.20 nm),large specific surface area(2324.1 m^(2)g^(-1)),low charge transfer resistance(1.65Ω),and high wettability with electrolyte(34°–35°),the obtained Ni2Co1-LDHs/BC50 electrode possesses an ultra-high specific capacitance of 2390 F g^(-1)(956 C g^(-1))at 1 A g^(-1),which is superior to most reported ***,an assembled Ni_(2)Co_(1)-LDHs/BC50//YP-80F HSC delivers a maximum specific energy of 52.47 Wh kg^(-1)at375 W kg^(-1),and maintains a high capacitance retention of 75.9%even after 4000 *** work provides a facile approach to fabricate LDHs nanosheets based cathode materials for high-performance HSCs.

关键词： Layered double hydroxides Nanosheets Biomass-derived porous carbon Wettability Hybrid supercapacitor

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Facile synthesis of Ni-,Co-,Cu-metal organic frameworks electrocatalyst boosting for hydrogen evolution reaction

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Journal of Materials Science & Technology 2021年第13期72卷 172-179页

作者： Man Zhang Di Hu Zhenhao Xu biying liu Mebrouka Boubeche Zuo Chen Yuchen Wang Huixia Luo Kai Yan Guangdong Provincial Key Laboratory of Environmental Pollution and Remediation Technology School of Environmental Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China Key Lab of Polymer Composite&Functional Materials School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou510275China

The conductive metal-organic frameworks(MOFs)are suggested as the ideal electrocatalysts for hydrogen evolution reaction(HER)because of the high utilization of metal *** design and facile synthesis of MOFs with large specific surface area,proper metals as center,and tunable chemical components is still full of ***,we report the facile synthesis three types of porous MOFs by regulating metal center using benzene-1,3,5-tricarboxylic acid(H3 BTC)as organic ligand and have successfully synthesized the rhombic octahedral Cu-BTC,rod-shaped Co-BTC and spherical Ni-BTC materials with large specific surface area ranged in 350-500 m^(2)g^(-1).These as-prepared MOFs materials exhibit high performance of HER in 0.5 M H_(2)SO_(4).Ni-BTC material exhibits the lowest overpotential of 53 mV at 10 mA cm-2 and the smallest Tafel slope of 62 mV dec^(-1)than those of Cu-BTC(270 mV,155 mV dec^(-1))and Co-BTC(123 mV,100 mV dec^(-1)),which are much superior to these previously reported MOFs *** addition,the fast catalytic kinetic of Ni-BTC was confirmed by the smaller charge transfer resistance(Rct)value of 0.9Ωand larger electrochemical active surface area(ECSA)of 35.5 cm^(2)than those of Cu-BTC(8.2Ω,22.5 cm^(2))and Co-BTC(1.9Ω,27.7 cm^(2)).Because of the structural advantage and large ECSA,the turnover frequency(TOF)value of Ni-BTC reaches up to 0.041 s-1 at 120 mV overpotential,which is 20.5 and 2.6 times greater than that of Cu-BTC(0.002 s-1)and Co-BTC(0.016 s-1).Besides,these three types of MOFs exhibited excellent durability over 12 *** study unfolds diverse insights into the design and facile synthesis of MOFs for electrochemical energy conversion system.

关键词： Metal-organic frameworks Hydrogen evolution reaction Activity Overpotential Durability

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One-step architecture of bifunctional petal-like oxygen-deficient NiAl-LDHs nanosheets for high-performance hybrid supercapacitors and urea oxidation

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Science China Materials 2022年第7期65卷 1805-1813页

作者： Yuchen Wang Yaoyu liu Man Zhang biying liu Zhiyue Zhao Kai Yan Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology School of Environmental Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China

Nickel-based layered double hydroxides(LDHs)are promising electrode materials in the fields of energy storage(supercapacitors)and conversion(urea oxidation).The rational construction of atomic and electronic structure is crucial for nickel-based LDHs to realize their satisfactory electrochemical ***,we report a facile,ecofriendly,one-step synthesis process to construct petal-like oxygen-deficient NiAl-LDH nanosheets for hybrid supercapacitors(HSCs)and urea oxidation reaction(UOR).The asprepared NiAl-LDH nanosheets with rich oxygen vacancies possess a large specific surface area of 216.6 m2 g^(-1) and a desirable electronic conductivity of 3.45×10^(–4)S cm^(-1) to deliver an ultra-high specific capacitance of 2801 F g^(-1)(700 C g^(-1))at 1 A g^(-1).Furthermore,high specific energy of 50.0 W h kg^(-1) at 400 W kg^(-1) and excellent cycle stability with 91%capacitance retention after 10,000 cycles are achieved by the NiAl-LDHs/CFP(carbon fiber paper)(+)//YP-80F(a commercial activated carbon)(–)***,NiAl-LDH nanosheets also work as an efficient electrocatalyst for UOR,which only requires 1.42 V *** hydrogen electrode to drive 10 mA cm^(–2) in 1 mol L^(-1) KOH with 0.33 mol L^(-1) *** remarkable performance is superior to most reported values of previous candidates owing to the thin structure of NiAl-LDH nanosheets for exposing more active sites and abundant oxygen *** addition,various reaction parameters are investigated to optimize the electrochemical *** general,this work paves a new way for the architecture of multifunctional nanostructured energy materials.

关键词： layered double hydroxides nanosheets oxygen vacancy hybrid supercapacitor urea oxidation reaction

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Bidirectional Light-Driven Ion Transport through Porphyrin Metal–Organic Framework-Based van der Waals Heterostructures via pH-Induced Band Alignment Inversion

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CCS Chemistry 2022年第10期4卷 3329-3341页

作者： Yuhui Zhang Linfeng Yang Yating Yang Wei Li biying liu Xiaoyan Jin Min Zhou Run Long Lei Jiang Wei Guo CAS Key Laboratory of Bio-Inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing University of Chinese Academy of Sciences Beijing College of Chemistry Key Laboratory of Theoretical and Computational Photochemistry of Ministry of EducationBeijing Normal UniversityBeijing

Heterogeneous two-dimensional layered membranes reconstructed fromnatural or synthetic van derWaals materials enable novel ion transport mechanisms by coupling with the chemical and optoelectronic properties of the layered ***,we report a light-driven and pH-dependent bidirectional ion transport phenomenon through porphyrin metal–organic framework(PMOF)and transition metal dichalcogenides-based multilayer van der Waals heterostructures with sub-nanometer ionic channels.

关键词： light-driven ion transport porphyrinbased metal–organic frameworks van der Waals heterostructures layered materials energy conversion

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紧密纺纱生产的工艺研究与实践

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棉纺织技术 2009年第4期37卷 1-5页

作者：刘必英江苏悦达纺织集团有限公司

为提高紧密纺纱质量,对紧密纺生产过程中原料选配、半成品质量、工艺配置及细纱有关工艺参数进行了工艺试验研究,并对多个品种紧密纺纱与普通环锭纺成纱质量进行了对比,指出:紧密纺比环锭纺具有明显的技术和质量优势,通过正确选配原料... 详细信息

为提高紧密纺纱质量,对紧密纺生产过程中原料选配、半成品质量、工艺配置及细纱有关工艺参数进行了工艺试验研究,并对多个品种紧密纺纱与普通环锭纺成纱质量进行了对比,指出:紧密纺比环锭纺具有明显的技术和质量优势,通过正确选配原料、控制精梳条短绒含量、合理选择粗纱定量和捻系数、优选网格圈目数、须条喂入位置以及细纱罗拉隔距、钳口规格、粗纱捻系数等工艺参数,可使紧密纺质量得到稳定和提高。

关键词：紧密纺配棉精梳短绒率粗纱定量网格圈毛羽条干强力

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四罗拉集聚纺莫代尔7.4 tex针织纱的工艺优化

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棉纺织技术 2020年第12期48卷 55-58页

作者：秦晓刘必英盐城工业职业技术学院江苏盐城224005 江苏悦达纺织集团有限公司江苏盐城224055

为提高集聚纺莫代尔7.4 tex针织纱的成纱质量,运用多目标灰色局势决策对吸风负压值和网格圈进行优选,并运用正交试验对粗纱捻系数、压力棒隔距块、纱线设计捻系数进行工艺优化,以纱线的断裂强力、条干CV、常发性纱疵IPI值、毛羽H值为性... 详细信息

为提高集聚纺莫代尔7.4 tex针织纱的成纱质量,运用多目标灰色局势决策对吸风负压值和网格圈进行优选,并运用正交试验对粗纱捻系数、压力棒隔距块、纱线设计捻系数进行工艺优化,以纱线的断裂强力、条干CV、常发性纱疵IPI值、毛羽H值为性能参考指标,通过分析测试数据,得出最优工艺组合为负压2000 Pa,网格圈3600目/cm^2,粗纱捻系数75,压力棒隔距块2.5 mm和纱线设计捻系数360。

关键词：集聚纺莫代尔针织纱多目标灰色局势决策吸风负压网格圈正交试验

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央行沟通的叙事传导:情绪与主题的信息效应

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财贸经济 2023年第2期44卷 55-72页

作者：隋建利刘碧莹吉林大学商学与管理学院 130012

本文通过构建混频DSGE模型,理论揭示央行叙事情绪与叙事“情绪-主题”的信息效应传导机制,并运用文本识别技术与机器学习方法,测度叙事情绪以及分类叙事主题,从而量化分析央行叙事情绪与叙事“情绪-主题”的信息效应,进一步,基于纵向、... 详细信息

本文通过构建混频DSGE模型,理论揭示央行叙事情绪与叙事“情绪-主题”的信息效应传导机制,并运用文本识别技术与机器学习方法,测度叙事情绪以及分类叙事主题,从而量化分析央行叙事情绪与叙事“情绪-主题”的信息效应,进一步,基于纵向、横向以及内部三方面的叙事情绪相似度,全面且深入地剖析央行沟通的叙事传导效果。研究发现,在书面单渠道以及书面、口头双渠道沟通下,央行叙事情绪均存在信息效应,能够改变私人部门对经济基本面的信念,以及调整私人部门对经济金融发展的预期。叙事情绪的信息效应存在与否及其传导效果,受到叙事渠道与叙事主题的影响,口头渠道沟通能够有效辅助书面渠道沟通,增强叙事情绪的信息效应传导机制。经济上行期主题相比经济下行期主题的叙事情绪更容易存在信息效应,但是,经济下行期主题一旦存在信息效应,传导效果更为明显。央行需保持前后纵向沟通以及不同渠道横向沟通的连贯性。相比口头渠道沟通,在利用书面渠道沟通文本内部的异常叙事信息时需要更加严谨、准确的措辞。

关键词：央行沟通叙事情绪叙事主题信息效应叙事情绪相似度

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专利诉讼的时空选择机理——一个基于动态竞争视角的理论框架

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科技进步与对策 2023年第1期40卷 123-130页

作者：任声策刘碧莹同济大学上海国际知识产权学院上海200092 上海海事大学经济管理学院上海200120

鉴于专利诉讼数量显著增加,并超越单纯的法律案件性质,专利诉讼已成为企业动态竞争中的重要武器,进而成为企业专利战略管理的关键环节。从动态竞争角度看,专利诉讼的时间和地点选择对诉讼结果以及竞争的影响尤为关键。通过总结专利诉讼... 详细信息

鉴于专利诉讼数量显著增加,并超越单纯的法律案件性质,专利诉讼已成为企业动态竞争中的重要武器,进而成为企业专利战略管理的关键环节。从动态竞争角度看,专利诉讼的时间和地点选择对诉讼结果以及竞争的影响尤为关键。通过总结专利诉讼研究文献和动态竞争理论,从动态竞争视角构建专利诉讼时空选择机理、效应的理论框架模型,有助于进一步开展实证研究,也有助于企业把握专利诉讼的本质,在动态竞争中积累优势。

关键词：专利诉讼时空选择动态竞争

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