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Modified carbon cloth as positive electrode with high electrochemical performance for vanadium redox flow batteries

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Journal of Energy Chemistry 2016年第4期25卷 720-725页

作者： Zhangxing He Zhongsheng Chen Wei Meng yingqiao jiang Gang Cheng Lei Dai Ling Wang jiangxi Engineering Research Center of Process and Equipment for New Energy East China Institute of Technology School of Chemical Engineering North China University of Science and Technology

Carbon cloth modified by hydrothermal treatment in ammonia water is developed as the positive electrode with high electrochemical performance for vanadium redox flow batteries. The SEM shows that the treatment has no obvious influence on the morphology of carbon cloth. XPS measurements indicate that the nitrogenous functional groups can be introduced on the surface of carbon cloth successfully. The electrochemical performance of V(IV)/V(V) redox couple on the prepared electrode is evaluated with cyclic voltammetry and linear sweep voltammetry measurements. The N-doped carbon cloth exhibits outstanding electrochemical activity and reversibility toward V(IV)/V(V) redox couple. The rate constant of V(IV)/V(V) redox reaction on carbon cloth can increase to 2.27 x 10(-4) cm/s from 1.47 x 10(-4) cm/s after nitrogen doping. The cell using N-doped carbon cloth as positive electrode has larger discharge capacity and higher energy efficiency compared with the cell using pristine carbon cloth. The average energy efficiency of the cell using N-doped carbon cloth for 50 cycles at 30 mA/cm(2) is 87.8%, 4.3% larger than that of the cell using pristine carbon cloth. It indicates that the N-doped carbon cloth has a promise application prospect in vanadium redox flow batteries. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.

关键词： Vanadium redox flow batteries Carbon cloth Electrode Kinetics Electrochemical performance

KHCO_3 activated carbon microsphere as excellent electrocatalyst for VO^(2+)/VO_2^+ redox couple for vanadium redox flow battery

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Journal of Energy Chemistry 2019年第2期28卷 103-110页

作者： Chen Zhao Yuehua Li Zhangxing He yingqiao jiang Lu Li Fengyun jiang Huizhu Zhou Jing Zhu Wei Meng Ling Wang Lei Dai School of Chemical Engineering North China University of Science and Technology State Key Laboratory Breeding Base of Nuclear Resources and Environment East China University of Technology Hebei Province Key Laboratory of Photocatalytic and Electrocatalytic Materials for Environment North China University of Science and Technology

In this paper,carbon microsphere prepared by hydrothermal treatment was activated by KHCO_3 at high temperature,and employed as the catalyst for VO^(2+)/VO_2^+redox reaction for vanadium redox flow battery(VRFB).Carbon microsphere can be etched by KHCO_3 due to the reaction between the pyrolysis products of KHCO_3 and carbon ***,KHCO_3 activation can bring many oxygen functional groups on carbon microsphere,further improving the wettability of catalyst and increasing the active *** electrocatalytic properties of carbon microsphere from hydrothermal treatment are improved by high temperature carbonization,and can further be enhanced by KHCO_3 *** carbon microsphere samples,the VO^(2+)/VO_2^+redox reaction exhibits the highest electrochemical kinetics on KHCO_3 activated *** cell using KHCO_3 activated carbon microsphere as the positive catalyst demonstrates higher energy efficiency and larger discharge capacity,especially at high current *** results reveal that KHCO_3 activated carbon microsphere is an efficient,low-cost carbon-based catalyst for VO^(2+)/VO_2^+redox reaction for VRFB system.

关键词： Energy storage Vanadium redox flow battery Carbon microsphere KHCO3 Etching

Nanostructured N-doped carbon materials derived from expandable biomass with superior electrocatalytic performance towards V^(2+)/V^(3+) redox reaction for vanadium redox flow battery

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Journal of Energy Chemistry 2021年第8期30卷 706-714,I0014页

作者： yingqiao jiang Mengchen Du Gang Cheng Peng Gao Tingting Dong Jing Zhou Xiaojian Feng Zhangxing He Yuehua Li Lei Dai Wei Meng Ling Wang School of Chemical Engineering North China University of Science and TechnologyTangshan 063009China Hebei Province Key Laboratory of Photocatalytic and Electrocatalytic Materials for Environment North China University of Science and TechnologyTangshan 063009China

Vanadium redox flow battery(VRFB)is one of the most promising large-scale energy storage systems,which ranges from kilowatt to ***,poor electrochemical activity of electrode for two redox couples still restricts the extensive applications of *** with V^(2+)/V^(3+)redox reaction,V^(2+)/V^(3+)reaction plays a more significant role in voltage loss of VRFB owing to slow heterogeneous electron transfer ***,N-doped carbon materials derived from scaphium scaphigerum have been developed as negative electrocatalyst by hydrothermal carbonization and high-temperature nitridation *** undoped carbon material hardly has electrocatalytic ability for V^(2+)/V^(3+)*** on this,N-doped carbon materials with urea as nitrogen source exhibit excellent electrocatalytic *** the material nitrided at 850°C(SSC/N-850)exhibits the best performance among those from700 to 1000℃.SSC/N-850 can accelerate the electrode process including V^(2+)/V^(3+)reaction and mass transfer of active ions due to the large reaction place,more active sites,and good *** effect of catalyst on comprehensive performance of cell was ***/N-850 can improve the charge-discharge performance *** of SSC/N-850 can lessen the electrochemical polarization of cell,further resulting in increased discharge capacity and energy *** capacity and energy efficiency increase by 81.5%and 9.8%by using SSC/N-850 as negative catalyst at 150 m A cm^(-2),*** study reveals that the developed biomass-derived carbon materials are the low-cost and efficient negative electrocatalyst for VRFB system.

关键词： Vanadium redox flow battery Electrocatalyst Biomass Expandable characteristic Improved electrochemical kinetics

^(60)Co辐照对女贞子中环烯醚萜苷类成分的影响

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中药新药与临床药理 2018年第6期29卷 790-793页

作者：毕福钧林彤江英桥广州市药品检验所广东广州510160

目的考察~60(Co)源不同辐照剂量灭菌处理对女贞子中环烯醚萜苷类成分的影响。方法采用高效液相色谱(HPLC)法,色谱柱Phenomenex Gemini C_(18)(250 mm×4.6 mm,5μm);流动相:乙腈-0.02%磷酸溶液,梯度洗脱;流速:1.0 mL·min^(-1);检测波长... 详细信息

目的考察~60(Co)源不同辐照剂量灭菌处理对女贞子中环烯醚萜苷类成分的影响。方法采用高效液相色谱(HPLC)法,色谱柱Phenomenex Gemini C_(18)(250 mm×4.6 mm,5μm);流动相:乙腈-0.02%磷酸溶液,梯度洗脱;流速:1.0 mL·min^(-1);检测波长:224 nm;选择5,10,25 kGy 3个剂量对不同含水量的女贞子药材进行辐照处理,比较辐照前后特女贞苷的含量以及环烯醚萜苷类成分HPLC图谱的变化。结果辐照前后女贞子中特女贞苷的含量和环烯醚萜苷类成分HPLC图谱变化均不明显。结论60Co源辐照灭菌对女贞子中环烯醚萜苷类成分无显著影响。

关键词：女贞子辐照红景天苷特女贞苷高效液相色谱法

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酸枣仁提取物定性定量分析方法的研究

中药新药与临床药理 2015年第3期26卷 365-369页

作者：毕福钧林彤江英桥广州市药品检验所广东广州510160

目的建立酸枣仁提取物薄层色谱鉴别方法及高效液相色谱-蒸发光散射检测法（HPLC-ELSD）同时测定酸枣仁皂苷A、B和斯皮诺素含量的方法。方法以水饱和正丁醇为展开剂,采用硅胶G板进行定性鉴别;采用HPLC-ELSD法进行定量测定,Kromasil C18... 详细信息

目的建立酸枣仁提取物薄层色谱鉴别方法及高效液相色谱-蒸发光散射检测法（HPLC-ELSD）同时测定酸枣仁皂苷A、B和斯皮诺素含量的方法。方法以水饱和正丁醇为展开剂,采用硅胶G板进行定性鉴别;采用HPLC-ELSD法进行定量测定,Kromasil C18色谱柱（200 mm×4.6 mm,5μm）;流动相为乙腈（A）-水（B）,梯度洗脱（0~15 min,20%A→40%A;15~22 min,40%A;22~24 min,40%A→80%A;24~30 min,80%A→100%A;30~40 min,100%A）;流速：1.0 m L·min-1;柱温：25℃,蒸发光散射检测器,漂移管温度：50℃,衰减6。结果酸枣仁提取物薄层色谱法鉴别效果良好。酸枣仁皂苷A、酸枣仁皂苷B和斯皮诺素的线性范围分别为0.105~1.68μg（r=0.9998）,0.0743~1.1885μg（r=0.9995）,0.2972~4.757μg（r=0.9992）;平均回收率分别为97.6%,99.9%,104.8%,RSD分别为：1.2%,1.9%和1.0%（n=6）。结论薄层色谱法简便,稳定;HPLC-ELSD法准确,具有良好的重复性和稳定性;适用于酸枣仁提取物的定性鉴别和定量测定。

关键词：酸枣仁提取物酸枣仁皂苷A 酸枣仁皂苷B 斯皮诺素薄层色谱鉴别 HPLC-ELSD

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基于核心素养感悟数学文化

当代教研论丛 2018年第8期5卷 79-80页

作者：蒋迎巧福建省泉州市晋江市第四实验小学福建泉州362200

数学素养的提升,将演绎着数学文化的魅力。数学文化有其自身独特的魅力,我们要引导学生"深得吾心";数学知识思想方法要锤炼,并引导学生自我建构;数学知识承载文化,我们要引导学生感悟。我们要将"数学课堂的文化意韵"落实到每一堂数学课... 详细信息

数学素养的提升,将演绎着数学文化的魅力。数学文化有其自身独特的魅力,我们要引导学生"深得吾心";数学知识思想方法要锤炼,并引导学生自我建构;数学知识承载文化,我们要引导学生感悟。我们要将"数学课堂的文化意韵"落实到每一堂数学课上;将课堂的延续,作为课堂的有效补充。

关键词：素养数学文化感悟

马克思“人的本质”理论的历史发展脉络及意义

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科教文汇 2016年第20期 173-174页

作者：江颖桥广州大学广东广州510006

马克思"人的本质"问题是马克思人学思想的核心,更是马克思历史唯物主义的出发点和落脚点。其经历了一个从研究人的"自我意识"到人的"类本质"再到人的现实本质过程,本文通过梳理其发展历程,试图找出其内在逻辑线索及意义。

关键词：马克思人的本质发展历程

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高效液相色谱柱后衍生法测定果实类药材中的黄曲霉毒素

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中药新药与临床药理 2011年第4期22卷 461-464页

作者：栗建明李纯顾利红江英桥广州市药品检验所广州510160

目的检测果实类药材中的黄曲霉毒素,了解其污染情况。方法样品经70%甲醇提取、免疫亲和柱净化后,用高效液相色谱-柱后衍生-荧光检测器进行分析测定果实类药材中4种黄曲霉毒素(G2、G1、B2、B1)的含量。结果检测的25批次的药材中,共6个批... 详细信息

目的检测果实类药材中的黄曲霉毒素,了解其污染情况。方法样品经70%甲醇提取、免疫亲和柱净化后,用高效液相色谱-柱后衍生-荧光检测器进行分析测定果实类药材中4种黄曲霉毒素(G2、G1、B2、B1)的含量。结果检测的25批次的药材中,共6个批次样品检出黄曲霉毒素,检出率为24%;桃仁和莲子2个批次样品黄曲霉毒素B1含量超过5μ***-1,阳性率为8%。结论果实类药材中黄曲霉毒素的含量大部分低于国家关于黄曲霉毒素的含量标准,但尚需要继续研究扩大监测品种。

关键词：黄曲霉毒素果实类中药材柱后衍生法

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辐照中药光释光鉴别法的建立与评价

中药新药与临床药理 2013年第1期24卷 91-96,107页

作者：张立雯林彤毕福钧江英桥广州市药品检验所广东广州510160

目的在欧盟标准EN 13751方法的基础上,建立可区分辐照中药与未辐照中药的光释光法,并对所建方法进行评价。方法将中药样品的测定结果采用欧盟方法与所建方法进行比较,观察系列剂量辐照后的检出情况和掺合稀释后的检出情况,研究光子计数(... 详细信息

目的在欧盟标准EN 13751方法的基础上,建立可区分辐照中药与未辐照中药的光释光法,并对所建方法进行评价。方法将中药样品的测定结果采用欧盟方法与所建方法进行比较,观察系列剂量辐照后的检出情况和掺合稀释后的检出情况,研究光子计数(PSL)值与F值的重复性,研究经辐照处理样品贮藏后的变化情况,研究盲样检出的正确率,以对所建方法进行科学评价。结果样品所含矿物质的种类和数量影响方法的检出灵敏度,敏感度高者低至0.1 kGy的辐照剂量即可以检出,灵敏度低者1 kGy以上的剂量能够检出。在未辐照样品中混入不同比例的经过辐照处理的药粉,掺合比例低至0.1%的样品也能正确识别。样品10次测定的PSL计数值重复性以及样品3份平行样测得F值的重复性满足要求。盲样测试正确率达100%。可见,所建方法在灵敏度、准确度、稳定性等各方面均能满足鉴别要求。结论所建光释光法鉴别辐照中药具有正确率高、快速简便的特点,与欧盟方法比较,更适合中药产品,判定规则更加简洁明确,而判定结果的准确度与欧盟方法一致,甚至优于欧盟方法。

关键词：光释光法辐照中药鉴别评价