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Superior wide-temperature lithium storage in a porous cobalt vanadate

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Nano Research 2020年第7期13卷 1867-1874页

作者： Haoliang Chen Dan Yang Xueye Zhuang Dong Chen Weiling Liu Qi Zhang Huey Hoon Hng Xianhong Rui Qingyu Yan shaoming huang Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua 617000China

Lithium ion batteries(LIBs)that can be operated under extended temperature range hold significant application potentials.Here in this work,we successfully synthesized Co2V2O7 electrode with rich porosity from a facile hydrothermal and combustion process.When applied as anode for LIBs,the electrode displayed excellent stability and rate performance in a wide range of temperatures.Remarkably,a stable capacity of 206 mAhg 1 was retained after cycling at a high current density of 10 A·g-1 for 6,000 cycles at room temperature(25℃).And even when tested under extreme conditions,i.e.,-20 and 60℃,the battery still maintained its remarkable stability and rate capability.For example,at-20℃,a capacity of 633 mAh·g 1 was retained after 50 cycles at 0.1 A·g 1;and even after cycling at 60℃ at 10 A·g-1 for 1,000 cycles,a reversible capacity of 885 mAh·g-1 can be achieved.We believe the development of such electrode material will fciliate progress of the next-generation LIBs with wide operating windows.

关键词： lithium-ion battery anode material cobalt vanadate porous structure wide-temperature performance

Pd embedded in porous carbon （Pd@CMK-3） as an active catalyst for Suzuki reactions： Accelerating mass transfer to enhance the reaction rate

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Nano Research 2014年第9期7卷 1254-1262页

作者： Zhencai Wang Wei Chen Zhenliang Han Jie Zhu Na Lu Yun Yang Dekun Ma Ying Chen shaoming huang Zhejiang Key Laboratory of Carbon Materials College of Chemistry and Materials Engineering Wenzhou University Wenzhou Zhejiang 325027 China ARC Centre of Excellence for Functional Nanomaterials Institute for Frontier Materials Deakin University Waurn Ponds Victoria 3216 Australia

Heterogeneous catalysts are promising candidates for use in organic reactions due to their advantages in separation, recovery, and environment compatibility. In this work, an active porous catalyst denoted as Pd embedded in porous carbon (Pd@CMK-3) has been prepared by a strategy involving immersion, ammoniahydrolysis, and heating procedures. Detailed characterization of the catalyst revealed that Pd(0) and Pd(II) species co-exist and were embedded in the matrix of the porous carbon (CMK-3). The as-prepared catalyst has shown high activity toward Suzuki reactions. Importantly, if the reaction mixture was homogenized by two minutes of ultrasonication rather than magnetic stirring before heating, the resistance to mass transfer in the pore channels was significantly reduced. As a result, the reactions proceeded more rapidly and a four-fold increase in the turnover frequency (TOF) could be obtained. When the ultrasonication was employed throughout the entire reaction process, the conversion could also exceed 90% even without the protection of inert gas, and although the reaction temperature was lowered to 30 °C. This work provides a method for fabricating highly active porous carbon encapsulated Pd catalysts for Suzuki reactions and proves that the problem of mass transfer in porous catalysts can be conveniently resolved by ultrasonication without any chemical modification being necessary.

关键词： Suzuki反应非均相催化剂多孔碳反应速率嵌入传质超声波处理多孔催化剂

Ordered structure of interlayer constructed with metal-organic frameworks improves the performance of lithium-sulfur batteries

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Nano Research 2021年第12期14卷 4556-4562页

作者： Sijia Guo Yingbo Xiao Jia Wang Yuan Ouyang Xin Li Haoyan Deng Wenchao He Qinghan Zeng Wei Zhang Qi Zhang shaoming huang Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices School of Materials and EnergyGuangdong University of TechnologyGuangzhou510006China Synergy Innovation Institute of GDUT Heyuan517000China

Lithium-sulfur(Li-S)battery has attracted intensive attention in the realm of energy storage owing to its high theoretical capacity and energy density.However,the shuttle effect of soluble lithium polysulfides(LiPSs)between electrodes results in rapid capacity degradation.Herein,a strategy which combines the design of both chemical interaction and microstructure of interlayer was proposed to suppress the shuttle effect.The chemical interaction between different functionalized MOFs and LiPSs was systematically studied to find the best candidate.Furthermore,an interlayer with ordered structure was constructed via the layer-by-layer assembly of metal-organic frameworks(MOFs)on graphene(UiO-66-NH_(2)@graphene)to create sinuous channels which can better impede the diffusion process of LiPSs by the strong adsorption of MOF toward LiPSs.Consequently,in comparison to the battery with a bare separator,the ordered interlayer increased the initial discharge capacity of battery by 28.98%at 1.0 C and lowered the capacity decay rate remarkably from 0.10%to 0.067%per cycle,indicating that the design of chemical interaction and microstructure paves the way for high-performance Li-S batteries.

关键词： ordered structure interlayer metal-organic frameworks lithium-sulfur battery

Oxyvanite V3O5:A new intercalation-type anode for lithium-ion battery

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InfoMat 2019年第2期1卷 251-259页

作者： Dong Chen Huiteng Tan Xianhong Rui Qi Zhang Yuezhan Feng Hongbo Geng Chengchao Li shaoming huang Yan Yu Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangzhouGuangdongChina Hefei National Laboratory for Physical Sciences at the Microscale Department of Materials Science and EngineeringKey Laboratory of Materials for Energy ConversionChinese Academy of Sciences(CAS)University of Science and Technology of ChinaHefeiAnhuiChina Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhouChina Department of Materials Science and Engineering University of Science and Technology of China Dalian National Laboratory for Clean Energy(DNL)CASDalianLiaoningChina

In the present study,V3O5 microcrystals that synthesized via vacuum calcination are employed as anodes for lithium-ion batteries(LIBs)for the first time.Despite the widely observed sluggish reaction kinetics and poor cycling stability in most microsized transition metal oxides,the V3O5 microcrystals exhibit excellent rate capability(specific capacities of 144 and 125 mAh g^−1 are achieved at extremely high current densities of 20 and 50 A g^−1,respectively)and long-term cycling performance(specific capacity of 117 mAh g^−1 is sustained over 2000 cycles at 50 A g^−1).It is ascribed to the three-dimensional open-framework structure of the V3O5 microcrystals as a major factor in dictating the fast reaction kinetics(lithium diffusion coefficient:~10−9 cm^2 s^−1).In addition,significant insight into the reaction mechanism of the V3O5 microcrystals in concomitant its phase evolution are obtained from ex-situ XRD study,revealing that the V3O5 microcrystals undergo intercalation reaction with insignificant structural change in response to lithiation/delithiation.

关键词： high-rate capability intercalation chemistry lithium-ion battery oxyvanite V3O5 anode

Carbon-nanoparticle-assisted growth of high quality bilayer WS2 by atmospheric pressure chemical vapor deposition

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Nano Research 2019年第11期12卷 2802-2807页

作者： Jieyuan Liang Lijie Zhang Xiaoxiao Li Baojun Pan Tingyan Luo Dayan Liu Chao Zou Nannan Liu Yue Hu Keqin Yang shaoming huang Key Laboratory of Carbon Materials of Zhejiang Province Institute of New Materials and Industrial TechnologiesCollege of Chemistry and Materials EngineeringWenzhou UniversityWenzhou325035China School of Materials and Energy Guangdong University of TechnologyGuangzhou510006China

Two-dimensional(2D)WS2 offers great prospects for assembling next-generation optoelectronic and electronic devices due to its thickness-dependent optical and electronic properties.However,layer-number-controlled growth of WS2 is still a challenge up to now.This work presents controlled growth of bilayer WS2 triangular flakes by carbon-nanoparticle-assisted chemical vapor deposition(CVD)process.The growth mechanism is also proposed.In addition,the field effect transistors(FETs)based on monolayer and bilayer WS2 are also fabricated and investigated.The bilayer FET displays a mobility of 34 cm2·V^-1·s^-1,much higher than that of the monolayer FET.The high figures of merit make bilayer WS2 a promising candidate in high-performance electronics and optoelectronics.

关键词： bilayer WS2 growth carbon nanoparticles chemical vapor deposition(CVD)

DSC法测定PET/PTT混纺产品中PTT纤维含量的不确定度评定

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市场监管与质量技术研究 2024年第2期 5-7,33页

作者：李莹黄宗雄郑少明林嘉欢福建省纤维检验中心福建福州350026

文中以差式扫描量热法(DSC)测定PTT(聚对苯二甲酸丙二醇酯)纤维含量为实验依据,分析实验过程中的不确定度来源并进行具体量化,得出差式扫描量热仪系统误差和热量求积是不确定度主要来源的结论。DSC法测定PTT纤维含量的相对扩展不确定度... 详细信息

文中以差式扫描量热法(DSC)测定PTT(聚对苯二甲酸丙二醇酯)纤维含量为实验依据,分析实验过程中的不确定度来源并进行具体量化,得出差式扫描量热仪系统误差和热量求积是不确定度主要来源的结论。DSC法测定PTT纤维含量的相对扩展不确定度为3.58%(k=2)。根据笔者在实验室长期检测的经验,给出提高检测结果准确性的建议。

关键词：差示扫描量热法(DSC) PTT纤维不确定度

Vertically aligned γ-Al00H nanosheets on Al foils as flexible and reusable substrates for NH3 adsorption

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Frontiers of physics 2018年第4期13卷 111-116页

作者： Chen Yang Ying Chen Dan Liu Jinfeng Wang Cheng Chen Jiemin Wang Ye Fan shaoming huang Weiwei Lei Institute for Frontier Materials Deakin University Locked Bag 2000 Geelong Victoria 3220 Australia Nanomaterials Chemistry Key Laboratory Wenzhou University Wenzhou 325035 China

Vertically aligned γ-AlOOH nanosheets （NSs） have been successfully fabricated on flexible Al foils via a solvothermal route without morphology-directing agents. Three different reaction temperature （25, 80, and 120 ℃） and time （30 min, 45 min, and 24 h） are discussed for the growth period, which efficiently tune the density and size of theγ-AlOOH NSs. Meanwhile, the growth speed of the nanosheets confirms that dominant growth stage is seen in the initial 45 min. Furthermore, the interlayer of the γ-AlOOH NSs displays an average height of 140 nm and superhydrophilicity. By dynamic adsorption, the as- synthesized γ-AlOOH NSs exhibit an outstanding NH3 adsorption capacity of up to 146 mg/g and stably excellent regeneration for 5 cycles. The mechanism of NH3 adsorption on the in-plane of the γ-AlOOH NSs is explained by the Lewis acid/base theory. The H-bond interactions among the NH3 molecules and the edge groups （-OH） further improve the capture ability of the nanosheets.

关键词： γ-AlOOH nanosheets NH3 adsorption Lewis acid/base theory H bonds interaction

Amorphous M0S2 confined in nitrogen-doped porous carbon for improved electrocatalytic stability toward hydrogen evolution reaction

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Nano Research 2019年第12期12卷 3116-3122页

作者： Shaojie Lu Wenjing Wang Shengshuang Yang Wei Chen Zhongbin Zhuang Wenjing Tang Caihong He Jiajing Qian Dekun Ma Yun Yang shaoming huang Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006China State Key Lab of Organic-Inorganic Composites and Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China

Developing non-precious metal catalysts with high activity and stability for electrochemical hydrogen evolution reaction(HER)is of great significance in both scie nee and tech no logy.In this work,N-doped CMK-3,which was prepared with a casting method using SBA-15 as thehard template and ammonia as the nitrogen source,has been utilized to hold MoS2 and restrict its growth to form MoS2@N-CMK-3 composite.As a result,M0S2 was found to have poorly crystallized and the limited space of porous N-CMK-3 made its size much small.Then there are moreactive sites in MoS2.Accordingly,MoS2@N-CMK-3 has exhibited good electrocatalytic performance toward HER in acids with a quite small Tafelslope of 32 mV·dec^-1.And more importantly,compared to MoS2@CMK-3,its stability has been greatly improved,which can be attributedto the interaction between M0S2 and nitrogen atoms avoiding aggregation and mass loss.This work provides an idea that doping a porouscarbon support with nitrogen is an effective way to enhance the stability of the catalyst.

关键词： M0S2 amorphous N-doped CMK-3 hydrogen evolution reaction(HER) stability

靖西大果山楂果实生长与果熟期果实营养动态分析

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广西林业科学 2024年第3期53卷 302-307页

作者：郝静伟蓝金宣黄晓露韦庆琳潘彩玲官秀芳叶绍明广西大学林学院广西南宁530004 广西壮族自治区林业科学研究院广西特色经济林培育与利用重点实验室广西南宁530002 广西壮族自治区国有高峰林场广西南宁530001

为掌握靖西大果山楂(Malus doumeri)果实生长发育及其在果熟期的营养动态变化规律,以靖西大果山楂果实为材料,观测和划分生长周期,并对果熟期果实的营养成分(糖、总酚、总黄酮、三萜、氮、磷、钾、钙和镁)含量进行测定和分析。结果表明... 详细信息

为掌握靖西大果山楂(Malus doumeri)果实生长发育及其在果熟期的营养动态变化规律,以靖西大果山楂果实为材料,观测和划分生长周期,并对果熟期果实的营养成分(糖、总酚、总黄酮、三萜、氮、磷、钾、钙和镁)含量进行测定和分析。结果表明,靖西大果山楂果实生长可分为迅速生长期(3月中旬—6月中旬)、缓慢生长期(6月中旬—8月中旬)、熟前速长期(8月中旬—9月中旬)和采前缓慢生长期(9月中旬—10月中旬)4个时期。采用Linear、Logarithmic、Quadratic和Logistic模型对果重、纵径、横径和糖度进行拟合;R^(2)最高的方程均为Quadratic方程,决定系数均在0.930以上,拟合程度均较高。在果熟期,果实糖度及总酚和总黄酮含量均随生长时间增加而升高;三萜含量呈先升后降的趋势,在10月15日最高;常量营养元素含量均表现为钾>氮>钙>磷>镁。果实糖度、总酚含量和总黄酮含量间均呈极显著正相关,磷含量与钾含量呈显著负相关。果重和果实营养成分含量均在10月中旬较高,靖西大果山楂果实较佳采收期为10月中旬。

关键词：生长节律营养成分靖西大果山楂