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An effective'salt in dimethyl sulfoxide/water'electrolyte enables high-voltage supercapacitor operated at-50℃

Journal of Energy Chemistry 2024年第6期93卷 361-367,I0009页

作者： Yingbin Liu Chang Yu Xuedan Song Siyi Hou Shuqin Lan Jinhe Yu Yuanyang Xie Jieshan Qiu State Key lab of Fine chemicals Frontier Science Center for Smart MaterialsSchool of Chemical EngineeringLiaoning Key Lab for Energy Materials and Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina School of Chemistry Frontier Science Center for Smart MaterialsLiaoning Key Lab for Energy Materials and Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina College of chemical Engineering State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical TechnologyBeijing 100029China

Compared with organic electrolytes,aqueous electrolytes exhibit significantly higher ionic conductivity and possess inherent safety features,showcasing unique advantages in ***,challenges remain for low-salt aqueous electrolytes operating at high voltage and low ***,we report a low-salt(0.87 m,m means mol kg^(-1))'salt in dimethyl sulfoxide/water'hybrid electrolyte with non-flammability via hybridizing aqueous electrolyte with an organic co-solvent of dimethyl sulfoxide(hydrogen bond acceptor).As a result,the 0.87 m hybrid electrolyte exhibits enhanced electrochemical stability,a freezing temperature below-50℃,and an outstanding ionic conductivity of 0.52mS cm~(-1)at-50℃.Dimethyl sulfoxide can anchor water molecules through intermolecular hydrogen bond interaction,effectively reinforcing the stability of water in the hybrid ***,the interaction between dimethyl sulfoxide and water molecules diminishes the involvement of water in the generation of ordered ice crystals,finally facilitating the low-temperature performance of the hybrid *** paired with the 0.87 m'salt in dimethyl sulfoxide/water'hybrid electrolyte,the symmetric supercapacitor presents a 2.0 V high operating voltage at 25℃,and can operate stably at-50℃.Importantly,the suppressed electrochemical reaction of water at-50℃further leads to the symmetric supercapacitor operated at a higher voltage of 2.6 *** modification strategy opens an effective avenue to develop low-salt electrolytes for high-voltage and low-temperature aqueous supercapacitors.

关键词： Dimethyl sulfoxide Co-solvent High voltage Low temperature Supercapacitors

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Intrinsic pentagon defect engineering in multiple spatial-scale carbon frameworks for efficient triiodide reduction

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Journal of Energy Chemistry 2024年第8期95卷 20-28,I0002页

作者： Siyi Hou Xuedan Song Chang Yu Jiangwei Chang Yiwang Ding Yingbin Liu Xiubo Zhang Weizhe Liu Jieshan Qiu State Key lab of Fine chemicals Liaoning Key Lab for Energy Materials and Chemical EngineeringFrontier Science Center for Smart MaterialsSchool of Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina Liaoning Key lab for Energy Materials and chemical Engineering Frontier Science Center for Smart MaterialsSchool of ChemistryDalian University of TechnologyDalian 116024LiaoningChina State Key laboratory of chemical Resource Engineering College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China

Intrinsic topological defect engineering has been proven as a promising strategy to elevate the electrocatalytic activity of carbon ***,the controllable construction of high-density and specific topological defects in carbon frameworks to reveal the relationship between reactivity and defect structure remains a challenging ***,the intrinsic pentagon carbon sites that can favor electron overflow and enhance their binding affinity towards the intermediates of catalytic reaction are firstly presented by the work function and the p-band center *** experimentally verify this,the cage-opening reaction of fullerene is proposed and utilized for synthesizing carbon quantum dots with specific pentagon configuration(CQDs-P),subsequently utilizing CQDs-P to modulate the micro-scale defect density of three-dimensional reduced graphene oxide(rGO)viaπ-π*** multiple spatial-scale rGO-conjugated CQDs-P structure simultaneously possesses abundant pentagon and edge defects as catalytic active sites and long-range-orderedπelectron delocalization system as conductive *** defects-rich CQDs-P/rGO-4 all-carbon-based catalyst exhibits superb catalytic activity for triiodide reduction reaction with a high photoelectric conversion efficiency of 8.40%,superior to the Pt reference(7.97%).Theoretical calculations suggest that pentagon defects in the carbon frameworks can promote charge transfer and modulate the adsorption/dissociation behavior of the reaction intermediates,thus enhancing the electrocatalytic activity of the *** work confirms the role of intrinsic pentagon defects in catalytic reactions and provides a new insight into the synthesis of defects-rich carbon catalysts.

关键词： Defect engineering Pentagon carbon Carbon quantum dots Electrocatalytic activity Triiodide reduction

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A chitosan-mediated inhalable nanovaccine against SARS-CoV-2

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Nano Research 2022年第5期15卷 4191-4200页

作者： Shao-Hua Zhuo Jun-Jun Wu Lang Zhao Wen-Hao Li Yu-Fen Zhao Yan-Mei Li Key lab of Bioorganic Phosphorus Chemistry&chemical biology Department of ChemistryTsinghua UniversityBeijing 100084China Beijing Institute for Brain Disorders Beijing 100069China Center for Synthetic and Systems biology Tsinghua UniversityBeijing 100084China Institute of Drug Discovery Technology Ningbo UniversityNingbo 315221China

Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2),with several antigenic variants,has grown into a global challenge,and the rapid establishment of an immune barrier is crucial to achieving long-term control of the *** has led to a great demand for easy preparation and scalable vaccines,especially in low-income ***,we present an inhalable nanovaccine comprising chitosan and SARS-CoV-2 spike *** chitosan-mediated nanovaccine enabled a strong spike-specific antibody immune response and augmented local mucosal immunity in bronchoalveolar lavage and lungs,which might be capable of protecting the host from infection without systemic *** addition,the enhanced adaptive immunity stimulated by chitosan showed potential protection against ***,inhalation of the nanovaccine induced a comparable antibody response compared to intramuscular *** inhalable nanovaccine against SARS-CoV-2 offers a convenient and compliant strategy to reduce the use of needles and the need for medical staff.

关键词： severe acute respiratory syndrome coronavirus 2(SASR-CoV-2) inhalation nanovaccine chitosan

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Antioxidant and antihyperlipidemic activity of Costus speciosus against atherogenic diet-induced hyperlipidemia in rabbits

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Journal of Integrative Medicine 2019年第3期17卷 181-191页

作者： Fatma Mohamed Hussein Shediwah Khalid Mohammed Naji Hussein Saleh Gumaih Fatima A Alhadi Amani Lutf Al-Hammami Myrene Roselyn D'Souza Department of biology Faculty of ScienceSana'a University Department of Chemistry Faculty of ScienceSana'a University chemical Ecology Department of BiologyUniversity of Konstanz Department of Biochemistry Mount Carmel College

Objective: An extract of Costus speciosus(CSE), a herb widely used in folk medicine, was evaluated for its antioxidant, antihyperlipidemic and ameliorating effects on histopathological changes in atherogenic ***: Twenty-four male rabbits(Oryctolagus cuniculus) were divided into 4 groups. Three groups were fed a diet containing 3% saturated fat and 1.3% cholesterol for 40 d. One of these was sacrificed on the 40 th day and was called the pathogenic(P) group; the other two groups received treatment for another 30 d as follows: one received 0.8 g/(kgád) of CSE and the other was given 0.01 g/(kgád) of simvastatin. The normal group was sacrificed on the 70 th day and used as a ***: CSE showed radical-scavenging ability. Administration of CSE for a 30-day period resulted in a significant decrease in total cholesterol, triacylglycerol, low-density lipoprotein and aspartate aminotransferase compared to the P group, while levels of hemoglobin, packed corpuscular volume and red blood cells were elevated. With respect to studies performed on the heart, a decrease in malondialdehyde and an increase in reduced glutathione were noted. Total protein increased in the liver, heart and aorta after treatment with CSE and also a marked improvement in histopathological parameters was ***: The present findings indicate that the C. speciosus rhizome possesses antiatherogenic and antioxidant properties which may provide protective effects against oxidative stress in atherosclerotic rabbits.

关键词： Antioxidants Atherosclerosis Costus speciosus Lipid profile Myocardial infraction Simvastatin

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“ALL FREE”—a novel design concept of applying partial oxidation process to vehicle engine

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Frontiers of chemical Science and Engineering 2010年第2期4卷 207-212页

作者： Ling LIN Yao ZHOU Wenshuang LIN Qingbiao LI Department of chemical and Biochemical Engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China National Engineering laboratory for Green chemical Productions of Alcohols Ethers and EstersXiamen UniversityXiamen 361005China Key lab for chemical biology of Fujian Province Xiamen UniversityXiamen 361005China

With the rapid expansion of the global motor vehicle population,the transportation sector has taken up a growing proportion among all the carbon dioxide emissionrelated *** contribute to solutions of the carbon dioxide-oriented problem in transportation,this paper proposes the“ALL FREE”concept that applies partial oxidation process instead of the conventional complete oxidation to vehicle *** such an engine,the fuels are partially oxidized into corresponding chemical products,which,as a result,enable the process to be theoretically free of CO_(2),while the heat output of the partial oxidation could drive the *** the other hand,the resulting products are of great value,which could decrease or even counteract the cost of fuels in *** this paper,the thermodynamic and kinetic data(e.g.,the heat output and heat release rate)of five selected partial oxidation reactions were calculated at length to demonstrate and exemplify the theoretical feasibility of the“ALL FREE”*** turned out that the partial oxidation of n-butane to maleic anhydride has the most potential to meet the basic requirements of this *** sum up,this design concept is of significant application potential for the reduction of CO_(2)emissions in the transportation industry,although there remain many technical challenges.

关键词： CO_(2)emission reduction partial oxidation reaction vehicle engine

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Effect of enzyme and mechanical stirring on the degradation of polyaspartic acid hydro-gel

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Progress in Natural Science:Materials International 2015年第5期25卷 425-429页

作者： Jun Wei Mingyuan Xue Chunling Li Hui Cao Tianwei Tan Beijing Key lab of Bioprocess Beijing University of Chemical Technology

As a biodegradable polymer, polyaspartic acid(PASP) hydro-gel has been applied in various fields. Although the degradation mechanism of PASP was well studied, to our knowledge, limited research has been done on the degradation of PASP hydro-gel, whose main chain was crosslinked. This work mainly focused on the effects of enzyme and mechanical stirring on the structure of the PASP hydro-gel during its *** change of the molecular weight and swelling ratio indicates that the simple mechanical stirring caused a break at the crosslink point of the PASP hydro-gel's spatial reticular structure with IR and SEM characterization, but has no significant effect on the degradation of the main *** the PH value of the degradation system also has little effect on the degradation of the main chain. However, the additions of enzyme both resulted in the break at the crosslink point and the degradation of the main chain, the significant decreases of both the molecular weight and swelling ratio of the PASP hydro-gel were observed.

关键词： Polyaspartic acid Hydro-gel Degradation Enzyme Mechanical stirring

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Preparative Optimization of Cellulose Microspheres Applied as Supports for High-Performance Liquid Chromatography

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Journal of Wuhan University of Technology(Materials Science) 2013年第3期28卷 460-466页

作者：陈伟 ZHANG Juan FAN Qingchun BAI Zhengwu 周兴平 XIE Xiaolin Key lab for Large-Format Battery Materials and Systems Ministry of Education School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Key lab of Green chemical Process Ministry of Education Hubei Key Laboratory of Novel Chemical Reactor and Green Chemical Technology Wuhan Institute of Technology

The aim of this work is optimizing the techniques to prepare pure cellulose microspheres, which are used as packing adsorbents for high-performance liquid chromatography. Thereupon, cellulose was dissolved in a pre-cooled NaOH/urea solution, from which various-size microspheres were prepared. The volume-average diameters were controlled approximately at 30 p,m, 8 ~tm and 4 pm grades when cyclohexane, liquid paraffin and pump oil were used as dispersants, respectively. The present investigations reveal that higher viscosity dispersant is suitable for the preparation of smaller-size microspheres, while larger size microspheres are prepared preferably using lower-viscosity dispersant. The chiral stationary phase derived from 8 μm grade microspheres can separate the enantiomers of efavirenz.

关键词： cellulose NaOH/urea aqueous solution microsphere packing material high-performance liquid chromatograph

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Cyclic Dinucleotide Self-Assembled Nanoparticles as a Carrier-Free Delivery Platform for STING-Mediated Cancer Immunotherapy

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CCS Chemistry 2024年第1期6卷 177-195页

作者： Lang Zhao Shao-Hua Zhuo Tian-Yang Wang Jun-Jun Wu Jing-Yun Su Wen-Hao Li Bo-Dou Zhang Yan-Mei Li Key lab of Bioorganic Phosphorus Chemistry&chemical biology Department of ChemistryTsinghua UniversityBeijing 100084 Beijing Institute for Brain Disorders Beijing 100069 Center for Synthetic and Systems biology Tsinghua UniversityBeijing 100084

Cyclic dinucleotides(CDNs)are natural agonists of the stimulator of interferon genes(STING),which is an attractive immunotherapy ***,CDNs and their derivatives are being investigated ***,the poor bioavailability of exogenous CDNs has limited their application in *** nanocarriers are widely used for cytosolic delivery of CDNs,their loading capacity is insufficient,and their complicated composition and purification process raises bio-compatibility ***,we report a super-simplified CDN self-assembly strategy for carrier-free delivery of *** the presence of excess K^(+),CDNs form oligomers which further self-assemble with divalent metal ions(such as Mn^(2+))to form nanoparticles(NPs)in aqueous *** demonstrate that the self-assembled CDN NPs promote cellular uptake of CDNs and enhance tumor immunogenicity by remodeling the tumor microenvironment,inducing immunogenic tumor cell death and increasing tumorinfiltrating lymphocytes,which is conducive to the generation of tumor neoantigen-specific T-cell *** also demonstrate that the use of CDN NPs alone or in combination with immune checkpoint blockades inhibits tumor growth,highlighting the fact that CDN NPs are a potent platform for cancer immunotherapy.

关键词： cyclic dinucleotide STING carrierfree delivery tumor immunogenicity cancer immunotherapy

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MCM-36 zeolites tailored with acidic ionic liquid to regulate adsorption properties of isobutane and 1-butene

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Chinese Journal of chemical Engineering 2016年第12期24卷 1703-1711页

作者： Hongxia Li Tao Zhang Shaojun Yuan Shengwei Tang Multiphase Mass Transfer and Reaction Engineering lab College of Chemical Engineering Sichuan University

Adsorption properties of an adsorbent or a catalyst towards adsorbates are crucial in the process of adsorption separation or catalytic reaction. Surface morphology and structure of adsorbents have a significant impact on the adsorption properties. In this study, a novel acidic ionic liquid, 1-butyl-3-(triethoxysilylpropyl)imidazolium hydrogen sulfate(i.e., [BTPIm][HSO_4]), was synthesized and subsequently grafted onto the MCM-36 zeolite for the regulation of its adsorption properties towards isobutane and 1-butene. The resultant [BTPIm][HSO_4]-immobilized MCM-36(i.e., MCM-36-IL) was characterized by FT-IR, XPS, XRD, SEM, TG/DTG and N_2 adsorption–desorption measurement. It was found that the specific surface area, micropore volume and mesopore volume of the MCM-36 support underwent a reduction upon the immobilization of ionic liquid,while the surface density of acid increased from 0.0014 to 0.0035 mmol·m^(-2). The adsorption capacity of isobutane and 1-butene on the MCM-36-IL was determined by a static volumetric method. Results demonstrated that the interaction between isobutane and MCM-36-IL was enhanced and the interaction between 1-butene and MCM-36-IL was reduced. As a result, a tunable adsorption ratio of isobutane/1-butene on MCM-36 was *** the increase in surface density of acid and the tunable adsorption ratio of isobutane and 1-butene on the functionalized MCM-36, the acidic ionic liquid-immobilized zeolites are beneficial to obtain an improved reaction yield and a prolonged catalyst life in the reactions catalyzed by solid acid.

关键词： Zeolite Ionic liquid Isobutane 1-Butene Adsorption

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An innovative graphene-based phase change composite constructed by syneresis with high thermal conductivity for efficient solar-thermal conversion and storage

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Journal of Materials Science & Technology 2024年第11期178卷 179-187页

作者： Jianqiang Wang Weijie Li Xinya Zhang School of Chemistry and chemical Engineering Guangdong Provincial Key Lab of Green Chemical Product TechnologySouth China University of TechnologyGuangzhou 510640China

Graphene-based phase change composites hold significant potential for solar energy utilization,but their poor thermal conductivity hinders their practical *** this work,an air-dried graphene skele-ton(AGS)with excellent thermal conductivity enhancement efficiency was constructed by the ice tem-plating method and syneresis,and the air-dried graphene phase change composite(AGP)was subse-quently obtained through vacuum-impregnating n-Docosane(C22)into *** syneresis effectively re-duced the phonon scattering between graphene sheets within AGS and increased the density of AGS to 0.1701 g/***,with a graphene skeleton loading of 23.82 wt.%,AGP exhibited excellent thermal conductivity of 9.867 W/(m K),outstanding electrical conductivity of 68.08 S/cm,and remarkable shape ***,AGP demonstrated a melting enthalpy of 188.5 J/g and an outstanding solar-thermal conversion efficiency of 93.98%,showing enormous potential for the utilization of solar energy.

关键词： Syneresis Graphene skeletons Thermal conductivities Phase change composites Solar-thermal conversion

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