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Surface modulated hierarchical graphene film via sulfur and phosphorus dual-doping for high performance flexible supercapacitors

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Chinese Chemical Letters 2019年第5期30卷 1121-1125页

作者： Xu Yu chengang pei Ligang Feng School of Chemistry and Chemical Engineering Yangzhou University

Graphene surface modification by heteroatom incorporation is an attractive strategy to construct flexible electrochemical ***,the steam-assistant heteroatoms of sulfur and phosphorus dualdoped graphene film(s-SPG)is fabricated via an ice-template and thermal-activation approach and they demonstrate an excellent pseudocapacitive behavior in flexible electrochemical *** probed by various microscopic and spectroscopic analysis,well-maintained porosity structure is formed during the freeze-drying and steam-activation treatment;the increased surface roughness is ascribed to heteroatoms doping by the formation of S-and P-containing functional groups as electrochemical active sites.A flexible device integrated by porous s-SPG film shows high pseudocapacitive behavior with high specific capacitance(169 F/g),rate capability(91.7%)and cyclic stability(92.5%).Even at the bend angle of 120,no obvious change of specific capacitance is found indicating a good flexibility of s-SPG devices;the current study shows that s-SPG is a very promising electrode to realize the practical applications of all solid flexible supercapacitors.

关键词： Heteroatom Flexible devices Steam-activation Supercapacitor Graphene film

Electrochemical oxygen evolution reaction efficiently boosted by selective fluoridation of FeNi3 alloy/oxide hybrid

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Journal of Energy Chemistry 2020年第8期29卷 166-171,I0006页

作者： Meng Zha chengang pei Quan Wang Guangzhi Hu Ligang Feng Key Laboratory of Medicinal Chemistry for Natural Resource(Yunnan University) Ministry of EducationSchool of Chemical Science and EngineeringYunnan UniversityKunming 650091YunnanChina School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002JiangsuChina

Performance boosting of hybrid metal oxide and metal alloy catalyst is crucial to the water electrolysis for hydrogen generation. Herein, a novel concept of selective fluoridation of metal alloy/oxide hybrid is proposed to boost their catalytic performance for the oxygen evolution reaction(OER). A well-recognized OER catalyst system of FeNi3 alloy/oxide embedded in nitrogen-doped porous nanofibers(FeNiO/NCF) is employed as a proof of concept, and it is selectively fluoridated by transforming the metal oxide to metal fluoride(FeNiF/NCF). The crystal structure and surface chemical state transformation are well supported by the spectroscopic analysis and the improved electrochemical performance for OER can be well correlated to the phase and structure change. Specifically, FeNiF/NCF can drive the benchmark current density of 10 mA cm-2 at 260 mV with a Tafel slope of 67 mV dec-1, about 70 mV less than that of FeNiO/*** catalytic kinetics, rapid charge transfer ability, high catalytic efficiency and stability are also probed by electrochemical analysis. The high surface area and roughness are found mainly generated via the high-temperature annealing for the metal alloy/metal oxide formation, and the low-temperature fluoridation process intrinsically contributes to the active structure formation. It is an efficient and universal approach to increase the catalytic performance of metal alloy/oxide for energy-relevant catalytic reactions.

关键词： Oxygen evolution reaction Water splitting FeNi Metal oxide Metal fluoride

Prussian blue analogue derived NiCoSe_(4) coupling with nitrogen-doped carbon nanofibers for pseudocapacitive electrodes

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Chinese Chemical Letters 2023年第11期34卷 297-301页

作者： Guohao Yang chengang pei Fang Xu Ho-Seok Park Xu Yu Huan Pang School of Material Science and Engineering Guizhou Minzu UniversityGuiyang 550025China School of Chemical Engineering Guizhou Minzu UniversityGuiyang 550025China Department of Chemical Engineering College of EngineeringSungkyunkwan UniversitySuwon-siGyeonggi-do 440-746Republic of Korea School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China

The design of pseudocapacitive materials by coupling transition metal compounds with a conductive carbon matrix is important for the high performance of ***,we construct the Prussian blue analogue derived nickel-cobalt selenides coupling with nitrogen-doped carbon nanofibers(NiCoSe_(4)-NCNFs)by carbonization and selenization of polyacrylonitrile *** effect of selenization and element N doping on the morphological structure and surface chemistry of NiCoSe_(4)-NCNFs are *** to the accelerated electrolyte ion diffusion,enlarged active surface area and the modified surface chemistry by the strong interaction at NiCoSe_(4)/NCNFs interfaces,NiCoSe_(4)-NCNFs show excellent capacitive behaviors in 1 mol/L KOH,and the specific capacitance is 1257 F/g at 1 A/g with a rate capability of 78%and cyclic stability of 82.9%.The Gibbs free energy of adsorption OH−is calculated by density functional theory to investigate the charge storage *** work offers a new strategy to construct the transition metal selenides/carbon nanofibers hybrids for high-performance supercapacitor devices.

关键词： Electrospinning Carbon nanofibers Supercapacitors Heteroatom doping Metal selenides

Core-shell heterostructure by coupling layered ReS_(2) with Co_(9)S_(8) nanocubes for boosted oxygen evolution reaction

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Chinese Chemical Letters 2024年第3期35卷 518-522页

作者： Xu Yu Zhiqiang Pan chengang pei Longjie Lin Yanhui Lu Ho Seok Park Huan Pang School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China School of Chemical Engineering Sungkyunkwan University2066Seobu-roJangan-guSuwon-siGyeonggi-do 440-746Republic of Korea

The controllable morphology and composition of catalysts are crucial to improving the electrocatalytic activity of oxygen evolution reaction(OER).Herein,we construct a bimetallic heterostructure by sulfidation and hydrothermal methods,and the layered ReS_(2)is vertically aligned on Prussian blue-derived hollow Co_(9)S_(8)nanocubes(Co_(9)S_(8)@ReS_(2)).The core-shell structure of Co_(9)S_(8)@ReS_(2)can effectively prevent the restacking of layered ReS_(2),expose the abundant surface area and improve the utilization of electrocatalytic sites,resulting in fast electrolyte diffusion and charge transfer during *** to the synergistic effect of the core-shell morphology and the formed bimetallic heterostructure,Co_(9)S_(8)@ReS_(2)exhibits excellent catalytic OER *** 10 mA/cm^(2),only 288 mV of overpotential is required with the Tafel slope of 73.3 mV/dec for Co_(9)S_(8)@ReS_(2),which are both lower than that of Co_(9)S_(8)and ReS_(2).Meanwhile,Co_(9)S_(8)@ReS_(2)exhibits high catalytic stability and low charge transfer resistance and the boosted active sites are confirmed by density functional *** work provides a rational design of the OER catalysts by constructing the bimetallic heterostructure.

关键词： Oxygen evolution reaction Rhenium disulfide Metal-organic framework Heterostructure Core-shell

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中国生物制品学杂志 2024年第8期37卷 904-910页

作者：秦玺裴德宁肖乐史新昌郭莹陶磊李响梁成罡中国食品药品检定研究院药品监管科学全国重点实验室国家卫生健康委员会生物技术产品检定方法及其标准化重点实验室国家药品监督管理局生物制品质量研究与评价重点实验室北京100050 ProteinSimple(中国) 上海200051

目的建立重组腺相关病毒(recombinant adeno-associated virus,rAAV)衣壳蛋白电荷异质性的成像毛细管等电聚焦电泳(imaged capillary isoelectric focusing,iCIEF)检测方法,并进行方法验证,以期为rAAV产品的表征研究、质量控制及生产工... 详细信息

目的建立重组腺相关病毒(recombinant adeno-associated virus,rAAV)衣壳蛋白电荷异质性的成像毛细管等电聚焦电泳(imaged capillary isoelectric focusing,iCIEF)检测方法,并进行方法验证,以期为rAAV产品的表征研究、质量控制及生产工艺稳定性的监控提供可靠的检测方法。方法将待测样品经变性处理后,采用紫外荧光检测模式进行iCIEF分析,进样时间设为55s,电压为1500V,聚焦时间为1min;随后将电压调整至3000V,并继续聚焦10min。激发波长设为280nm,发射荧光检测曝光时间设为80s。以rAAV5型空心颗粒(rAAV-E)为待测样品,验证方法的专属性、精密性、线性范围、准确性及定量限。采用建立的方法检测rAAV5型实心颗粒(rAAV-F)样品的电荷异质性。结果rAAV-E样品在pH6.9~7.1之间呈现2个明显主峰(Peak1和Peak2),空白对照未检测到病毒衣壳蛋白峰;6次重复检测rAAV-E样品2个主峰Peak1和Peak2的pI均值分别为6.91和7.04,RSD均为0.14%,峰面积百分比均值分别为35.6%和55.8%,RSD分别为1.1%和0.4%;3个时间点检测rAAV-E样品2个主峰Peak1和Peak2峰面积百分比的RSD分别为3.45%和3.38%,pl的RSD分别为0.10%和0.11%;rAAV-E浓度在(4.08~6.12)×10^(12)vp/mL范围内,与Peak1和Peak2的总峰面积均值呈良好的线性关系,线性回归方程为y=54888x-76556,R^(2)=0.976;80%、100%和120%预期浓度rAAV-E样品2个主峰总峰面积的回收率均在80%~120%范围内;Peak1的定量限为1.02×10^(12)vp/mL,Peak2定量限为0.76×10^(12)vp/mL。rAAV-F样品呈现Peak1和Peak2外,在酸性区域(pl<5.85)还观察到明显的额外峰,这是rAAV-F区别于rAAV-E的主要特征,也表明其具有复杂的电荷异质性分布。结论建立的iCIEF法具有良好的专属性、精密性及准确性,可用于rAAV衣壳蛋白电荷异质性的分析。

关键词：成像毛细管等电聚焦电泳重组腺相关病毒衣壳蛋白电荷异质性

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辐射法制备羧酸型均质离子交换膜

膜科学与技术 1983年第3期 8-14页

作者：罗腊生罗显明付桂荣张世枚彭沛礼张志平化工部晨光化工研究院

本文研究了低密度聚乙烯膜与丙烯酸辐射接枝的工艺参数.制备了一种羧酸型均质离子交换膜。聚乙烯接枝丙烯酸膜具有低的电阻、较高的离子交换容量、耐氧化性能好,耐腐蚀性强,是一种优良的碱性电池隔膜材料,能大大延长碱性电池的使用寿命。

关键词：接枝聚乙烯膜溶剂离子交换容量丙烯酸接枝率羧酸型均质离子交换膜离子交换树脂辐射法