检索结果-南通市图书馆

Ultra-high specific surface area activated carbon from Taihu cyanobacteria via KOH activation for enhanced methylene blue adsorption

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2024年第3期67卷 106-116页

作者： Yifang Mi Wenqiang Wang Sen Zhang Yalong Guo yufeng zhao Guojin Sun Zhihai Cao Key Laboratory of Advanced Textile Materials and Manufacturing Technology and Engineering Research Center for Eco-Dyeing&Finishing of Textiles Ministry of EducationZhejiang Provincial Engineering Research Center for Green and Low-carbon Dyeing&FinishingZhejiang Sci-Tech UniversityHangzhou 310018China Key Laboratory for Technology in Rural Water Management of Zhejiang Province Zhejiang University of Water Resources and Electric PowerHangzhou 310018China

Cyanobacteria-based activated carbon(CBAC)was successfully prepared by pyrolysis-activation of Taihu *** the impregnation ratio and activated temperature were 2 and 800-C,respectively,the optimal CBACs possessed an ultra-high specific surface(2178.90 m^(2)·g^(-1))and plenty of micro-and meso-pores,as well as a high pore volume(1.01 cm^(3)·g^(-1)).Ascribed to ultra-high surface area,π-π interaction,electrostatic interaction,as well as hydrogen-bonding interactions,the CBACs displayed huge superiority in efficient dye *** saturated methylene blue adsorption capacity by CBACs could be as high as 1143.4 mg·g^(-1),superior to that of other reported biomass-activated *** adsorption was endothermic and modeled well by the pseudo-second-order kinetic,intra-particle diffusion,and Langmuir *** work presented the effectiveness of Taihu cyanobacteria adsorbent ascribed to its super large specific surface area and high adsorption ability.

关键词： Activated carbon Biomass Dye adsorption Taihu cyanobacteria

Suppression of multistep phase transitions of O3-type cathode for sodium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第5期35卷 453-458页

作者： Shengyu zhao Qinhao Shi Wuliang Feng Yang Liu Xinxin Yang Xingli Zou Xionggang Lu yufeng zhao Institute for Sustainable Energy&College of Sciences Shanghai UniversityShanghai 200444China State Key Laboratory of Advanced Special Steel&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering Shanghai UniversityShanghai 200444China

O3-type layered oxide cathodes have been widely investigated due to their high reversible capacities and sufficient Na+***,such materials usually suffer from complex multistep phase transitions along with drastic volume changes,leading to the unsatisfied cycle ***,we report a Mg/Ti co-doped O3-type NaNi_(0.5)Mn_(0.5)O_(2),which can effectively suppress the complex multistep phase transition and realize a solid-solution reaction within a wide voltage *** is confirmed that,the Mg/Ti co-doping is beneficial to enhance the structural stability and integrity by absorbing micro-strain and ***,the as obtained sample delivers an outstanding cyclic performance(82.3%after 200 cycles at 1 C)in the voltage range of 2.0-4.0 V,and a high discharge capacity of 86.6 mAh/g after 100 cycles within the wide voltage range(2.0-4.5 V),which outperform the existing *** co-doping strategy offers new insights into high performance O3-type cathode for sodium ion batteries.

关键词： Sodium ion batteries Mg/Ti co-doping Phase transition Cyclic performance High voltage performance

Model reduction of fractional impedance spectra for time–frequency analysis of batteries, fuel cells, and supercapacitors

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2024年第1期6卷 108-141页

作者： Weiheng Li Qiu-An Huang Yuxuan Bai Jia Wang Linlin Wang Yuyu Liu yufeng zhao Xifei Li Jiujun Zhang Institute for Sustainable Energy/College of Sciences Shanghai UniversityShanghaiChina Shanxi Key Laboratory of Nanomaterials and Nanotechnology School of Mechanical and Electrical EngineeringXi'an University of Architecture and TechnologyXi'anShaanxiChina Xi'an Key Laboratory of New Energy Materials and Devices School of Materials Science and EngineeringInstitute of Advanced Electrochemical EnergyXi'an University of TechnologyXi'anShaanxiChina

Joint time–frequency analysis is an emerging method for interpreting the underlying physics in fuel cells,batteries,and *** increase the reliability of time–frequency analysis,a theoretical correlation between frequency-domain stationary analysis and time-domain transient analysis is urgently *** present work formularizes a thorough model reduction of fractional impedance spectra for electrochemical energy devices involving not only the model reduction from fractional-order models to integer-order models and from high-to low-order RC circuits but also insight into the evolution of the characteristic time constants during the whole reduction *** following work has been carried out:(i)the model-reduction theory is addressed for typical Warburg elements and RC circuits based on the continued fraction expansion theory and the response error minimization technique,respectively;(ii)the order effect on the model reduction of typical Warburg elements is quantitatively evaluated by time–frequency analysis;(iii)the results of time–frequency analysis are confirmed to be useful to determine the reduction order in terms of the kinetic information needed to be captured;and(iv)the results of time–frequency analysis are validated for the model reduction of fractional impedance spectra for lithium-ion batteries,supercapacitors,and solid oxide fuel *** turn,the numerical validation has demonstrated the powerful function of the joint time–frequency *** thorough model reduction of fractional impedance spectra addressed in the present work not only clarifies the relationship between time-domain transient analysis and frequency-domain stationary analysis but also enhances the reliability of the joint time–frequency analysis for electrochemical energy devices.

关键词： battery,fuel cell,supercapacitor fractional impedance spectroscopy model reduction time-frequency analysis

Highly efficient and stable electrocatalyst for hydrogen evolution by molybdenum doped Ni-Co phosphide nanoneedles at high current density

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第3期17卷 1066-1074页

作者： Chengyu Huang Zhonghong Xia Jing Wang Jing Zhang Chenfei zhao Xingli Zou Shichun Mu Jiujun Zhang Xionggang Lu Hong Jin Fan Shengjuan Huo yufeng zhao College of Sciences&Institute for Sustainable Energy Shanghai UniversityShanghai 200444China State Key Laboratory of Metastable Materials Science and Technology Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource ReuseYanshan UniversityQinhuangdao 066004China State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy School of Materials Science and EngineeringShanghai UniversityShanghai 200444China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore639798

There is an increasingly urgent need to develop cost-effective electrocatalysts with high catalytic activity and stability as alternatives to the traditional Pt/C in catalysts in water *** this study,microspheres composed of Mo-doped NiCoP nanoneedles supported on nickel foam were prepared to address this *** results show that the nanoneedles provide sufficient active sites for efficient electron transfer;the small-sized effect and the micro-scale roughness enhance the entry of reactants and the release of hydrogen bubbles;the Mo doping effectively improves the electrocatalytic performance of NiCoP in alkaline *** catalyst exhibits low hydrogen evolution overpotentials of 38.5 and 217.5 mV at a current density of 10 mA·cm^(-2) and high current density of 500 mA·cm^(-2),respectively,and only 1.978 V is required to achieve a current density of 1000 mA·cm^(-2) for overall water *** functional theory(DFT)calculations show that the improved hydrogen evolution performance can be explained as a result of the Mo doping,which serves to reduce the interaction between NiCoP and intermediates,optimize the Gibbs free energy of hydrogen adsorption(△G_(*H)),and accelerate the desorption rate of **** study provides a promising solution to the ongoing challenge of designing efficient electrocatalysts for high-current-density hydrogen production.

关键词： transition metal phosphides Mo-doped NiCoP hydrogen evolution reaction gradient hydrothermal water splitting

Construction of Cu-Zn Co-doped layered materials for sodium-ion batteries with high cycle stability

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第5期35卷 441-446页

作者： Xiping Dong Xuan Wang Zhixiu Lu Qinhao Shi Zhengyi Yang Xuan Yu Wuliang Feng Xingli Zou Yang Liu yufeng zhao Institute for Sustainable Energy&College of Sciences Shanghai UniversityShanghai 200444China Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of TechnologyYancheng 224051China State Key Laboratory of Advanced Special Steel&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering Shanghai UniversityShanghai 200444China

Due to its high operational voltage and energy density,P2-type Na_(0.67)Ni_(0.3)Mn_(0.7)O_(2) has become a leading cathode material for sodium-ion batteries(SIBs),which is an ideal option for large-scale energy ***,the practical application of P2-type Na_(0.67)Ni_(0.3)Mn_(0.7)O_(2) is limited by the capacity constraints and unwanted phase transitions,presenting significant challenges to the widespread application of *** address these challenges and optimize the electrochemical properties of the P2 phase cathode material,this study proposes a Cu and Zn co-doped strategy to improve the electrochemical *** incorporation of Cu/Zn can stabilize the P2-phase structure against P2-O2 phase transitions,thus enhancing its electrochemical *** as-obtained P2-type Na0.67[Ni_(0.3)Mn_(0.58)Cu_(0.09)Zn_(0.03)]O_(2) cathode material shows an impressive cycling stability,maintaining 80%capacity retention after 1000 cycles at 2 *** cyclic voltammetry(CV)tests show that the Cu^(2+)/Cu^(3+)redox reaction is also involved in charge compensation during the charge/discharge process.

关键词： Sodium-ion batteries Cathode material Cycle performance Cu/Zn co-doped P2-type Na_(0.67)Ni_(0.3)Mn_(0.7)O_(2)

在线全文

学校读者我要写书评

暂无评论

外加电场加速前驱体法制备SiOC陶瓷材料

中国陶瓷 2024年第1期60卷 22-27,56页

作者：王力霞赵玉峰攀枝花学院钒钛学院攀枝花617000 攀枝花学院电气信息工程学院攀枝花617000

采用闪速热解法通过聚合物前驱体制备了硅氧碳(SiOC)陶瓷材料。外加电场显著加速了SiOC微观相结构变化,与传统方法相比,SiOC前驱体在较低的热解温度下发生相分离,产生了碳和SiC相。在电场作用下,样品会形成更多的碳化硅和更有序的碳相... 详细信息

采用闪速热解法通过聚合物前驱体制备了硅氧碳(SiOC)陶瓷材料。外加电场显著加速了SiOC微观相结构变化,与传统方法相比,SiOC前驱体在较低的热解温度下发生相分离,产生了碳和SiC相。在电场作用下,样品会形成更多的碳化硅和更有序的碳相。其基本原理可以用电场和焦耳加热共同作用下的显著改变相变驱动力来解释。这项工作提供了一个低温合成SiOC纳米复合材料新路线。

关键词： SiOC陶瓷材料前驱体法外加电场闪速热解相分离

在线全文

学校读者我要写书评

暂无评论

茵栀黄口服液治疗新生儿病理性黄疸临床观察

光明中医 2024年第9期39卷 1713-1716页

作者：赵玉风山西省汾阳医院新生儿科

目的探讨茵栀黄口服液治疗新生儿病理性黄疸的疗效。方法选取2021年1月—2022年1月山西省汾阳医院收治的120例病理性黄疸新生儿，采用随机数字表法分为A组(蓝光照射联合口服益生菌)、B组(蓝光照射、口服益生菌、茵栀黄口服液),各60例... 详细信息

目的探讨茵栀黄口服液治疗新生儿病理性黄疸的疗效。方法选取2021年1月—2022年1月山西省汾阳医院收治的120例病理性黄疸新生儿，采用随机数字表法分为A组(蓝光照射联合口服益生菌)、B组(蓝光照射、口服益生菌、茵栀黄口服液),各60例，2组均治疗5 d。比较2组各项指标。结果治疗后，2组患儿临床总有效率比较，B组较A组更高(P0.05)。结论茵栀黄口服液可以促进新生儿病理性黄疸症状好转，缩短住院时间，改善心肌功能，保护神经功能，有利于改善预后。

关键词：胎黄病理性黄疸茵栀黄口服液新生儿

具有比率依赖的HollingⅡ型功能反应函数的染病捕食者-食饵随机模型的动力学分析

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

海南师范大学学报（自然科学版） 2024年第2期37卷 144-151页

作者：赵玉凤山西工商学院计算机信息工程学院山西太原030000

研究了带有饱和发生率和比率依赖的HollingⅡ型功能反应函数的染病捕食者-食饵随机模型的动力学性质。首先构造合适的Lyapunov函数,利用Ito公式,通过反证法证明了在满足利普希茨条件下随机模型存在唯一的全局正解;然后,利用Ito公式、局... 详细信息

研究了带有饱和发生率和比率依赖的HollingⅡ型功能反应函数的染病捕食者-食饵随机模型的动力学性质。首先构造合适的Lyapunov函数,利用Ito公式,通过反证法证明了在满足利普希茨条件下随机模型存在唯一的全局正解;然后,利用Ito公式、局部鞅的大数定律等随机微分方程的相关理论证明了系统在满足一定条件时食饵是持久的,易感捕食者和染病捕食者将逐渐灭绝;最后,通过数值仿真验证了结果的正确性,并得到了主要参数对模型的解产生的影响。

关键词：染病捕食者-食饵随机模型饱和发生率 HollingⅡ型功能反应函数比率依赖灭绝

维普期刊数据库博看期刊

大变迁时代国民体育锻炼行为的“中国实践”——基于年龄、时期、队列的视角

在线全文

学校读者我要写书评

暂无评论

上海体育大学学报 2024年第1期48卷 26-35页

作者：王富百慧赵玉峰张现苓国家体育总局体育科学研究所北京100061 中国宏观经济研究院社会发展研究所北京100038 中央财经大学社会与心理学院北京100081

以实证研究考察社会变迁进程中国民体育锻炼行为的多重形态。从年龄、时期和队列三维视角分析发现,队列趋势主导国民体育锻炼行为变迁,城市化水平提升、高等教育普及、社会保障持续完善间接驱动国民体育锻炼行为的集体改变,这一特点在... 详细信息

以实证研究考察社会变迁进程中国民体育锻炼行为的多重形态。从年龄、时期和队列三维视角分析发现,队列趋势主导国民体育锻炼行为变迁,城市化水平提升、高等教育普及、社会保障持续完善间接驱动国民体育锻炼行为的集体改变,这一特点在“50后”中表现最为显著。在时期层面,国民体育锻炼参与程度自2010年开始持续提升,2013年开始进入快速发展期,除整体走向与政策实施、重大事件的发生周期基本吻合外,国民收入水平提升是重要外生力量。从个体生命历程判断,随年龄增长体育锻炼参与程度逐渐降低是一个共性规律,但下降过程中呈现2个不同的速率阶段。国民体育锻炼行为变迁呈现代际的趋同和分化,“60后”“70后”“80后”是驱动城乡趋同的主要力量,性别趋同集中表现在“50后”“60后”“75前”群体中,由高等教育福利获得的机遇差异可能是导致新老代际分化趋势扩大的重要因素。

关键词：体育锻炼行为国民全民健身中国实践时代变迁

维普期刊数据库博看期刊