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Molten salt synthesis of α-MnO_(2)/Mn_(2)O_(3) nanocomposite as a high-performance cathode material for aqueous zinc-ion batteries

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Journal of Energy Chemistry 2021年第3期30卷 475-481页

作者： Aixiang Huang weijun zhou Anran Wang Minfeng Chen Qinghua Tian Jizhang Chen College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037JiangsuChina Department of Chemistry School of SciencesZhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing 210037JiangsuChina

Thanks to low cost,high safety,and large energy density,aqueous zinc-ion batteries have attracted tremendous interest ***,it remains a challenge to develop high-performance cathode materials with an appropriate method that is easy to realize massive ***,we use a molten salt method to synthesize nanostructured manganese *** crystalline phases of the manganese oxides can be tuned by changing the amount of reduced graphene oxide added to the reactant *** is found that the α-MnO_(2)/Mn_(2)O_(3) nanocomposite with the largest mass ratio of Mn_(2)O_(3) delivers the best electrochemical performances among all the *** its rate capability and cyclability can be significantly improved by modifying the Zn anode with carbon black coating and nanocellulose *** this situation,the nanocomposite can deliver high discharging capacities of 322.1 and 213.6 mAh g^(-1) at 0.2 and 3 Ag^(-1),*** 1000 cycles,it can retain 86.2% of the capacity at the 2 nd ***,this nanocomposite holds great promise for practical applications.

关键词： Manganese oxides Molten salt synthesis Nanostructured composites Aqueous batteries Zinc ion storage

Ultrathin Zn-free anode based on Ti_(3)C_(2)T_(x) and nanocellulose enabling high-durability aqueous hybrid Zn-Na battery with Zn2+/Na+co-intercalation mechanism

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Nano Research 2023年第1期16卷 536-544页

作者： Hao Chen weijun zhou Minfeng Chen Qinghua Tian Xiang Han Jizhang Chen College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037China Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang Province Department of ChemistryZhejiang Sci-Tech UniversityHangzhou 310018China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing 210037China

With low cost and high safety,aqueous zinc-based batteries have received considerable ***,the excess utilization of zinc metal in the anodes of these batteries reduces energy density and increases ***,an ultrathin electrode of approximately 6.2μm thick is constructed by coating Ti_(3)C_(2)T_(x)/nanocellulose hybrid onto a stainless steel *** electrode is used as the Zn-free anode for aqueous hybrid Zn-Na battery,in which,a concentrated electrolyte is used to improve electrochemical *** Ti_(3)C_(2)T_(x)/nanocellulose coating is found to improve the electrolyte wettability,facilitate desolvation process of hydrated Zn^(2+) ions,lower nucleation overpotential,improve zinc plating kinetics,guide horizontal zinc plating along the Zn(002)facet,and inhibit parasitic side *** is also found that the Na_(3)V_(2)(PO_(4))_(3) cathode material adopts a highly reversible Zn^(2+)/Na^(+)co-intercalation charge storage mechanism in this *** to these benefits,the assembled hybrid Zn-Na battery exhibits excellent rate capability,superior cyclability,and good anti-freezing *** work provides a new concept of electrode design for electrochemical energy storage.

关键词： MXene-based composites ultrathin electrodes electrode surface coatings aqueous hybrid batteries co-intercalation charge storage mechanisms

Novel dual fluorescence temperature-sensitive chameleon DNA-templated silver nanocluster pair for intracellular thermometry

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Nano Research 2018年第4期11卷 2012-2023页

作者： weijun zhou Jinbo Zhu Ye Teng Baoji Du Xu Han Shaojun Dong State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China University of Chinese Academy of Sciences Beijing 100049 China

For the first time, we are reporting a novel type of dual fluorescence temperaturesensitive DNA-templated silver nanocluster （AgNC） pair, which contains two pieces of single-stranded AgNC in proximity through hybridization. Both the chameleon AgNC pairs, A-NCP and B-NCP, possess two bright fluorescence peaks that achieve sensitive variations corresponding to temperature change from 15 to 45 ℃. With the increase in temperature, one of the fluorescence emissions of A-NCP （A-FL570） increases, while the other （A-FL640） decreases. However, both the emissions of B-NCP （B-FL685 and B-FL620） decrease simultaneously. Therefore, A-NCP shows a remarkable fluorescence color variation from orange to yellow, while the fluorescence color of B-NCP changes from orange to colorless, with increase in temperature. Moreover, the temperature responding linear range of A-NCP can be regulated by adjusting the structures and sequences of assistant DNA templates. It is assumed that the two single-stranded segmental AgNCs are integrated together as they are assembled into AgNC pairs, leading to a dramatic variation in fluorescence properties. The temperature-sensitive phenomenon is due to the dehybridization-induced separation of two pieces of segmental AgNC, caused by temperature increase. The temperature-sensitive AgNC pairs have been successful in indicating the temperature of living cells, showing the potential for a new application of silver nanocluster as a nanothermometer with adjustable response range, bringing novel insight into the regulatory mechanism of AgNC fluorescence variation.

关键词： DNA-templated silver nanocluster (AgNC) chameleon temperature-sensitive fluorescence

Optimizing the electrolyte salt of aqueous zinc-ion batteries based on a high-performance calcium vanadate hydrate cathode material

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Journal of Energy Chemistry 2021年第1期30卷 377-384,I0012页

作者： weijun zhou Minfeng Chen Anran Wang Aixiang Huang Jizhang Chen Xinwu Xu Ching-Ping Wong College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037JiangsuChina School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaUnited States

It is urgent to develop high-performance cathode materials for the emerging aqueous zinc-ion batteries with a facile strategy and optimize the related ***,a Ca0.23V2O5·0.95 H2O nanobelt cathode material with a rather large interlayer spacing of 13.0 A is prepared via a one-step hydrothermal *** battery with this cathode material and 3 M Zn(CF3SO3)2 electrolyte displays high specific capacity(355.2 mAh g^(-1) at 0.2 A g^(-1)),great rate capability(240.8 mAh g^(-1) at 5 A g^(-1)),and excellent cyclability(97.7% capacity retention over 2000 cycles).Such superior performances are ascribed to fast electrochemical kinetics,outstanding electrode/electrolyte interface stability,and nearly dendrite-free ***,when ZnSO4 or Zn(ClO4)2 is used to replace Zn(CF3SO3)2,the electrochemical performances become much inferior,due to the slow electrochemical kinetics,inhomogeneous Zn stripping/plating process,and the formation of large dendrites and *** work not only discloses a high-performance cathode material for aqueous zinc-ion batteries but also offers a reference for the choice of electrolyte salt.

关键词： Calcium vanadate hydrates Electrolytes Interfacial stability Zn-ion batteries Aqueous energy storage

Artificial solid electrolyte interface layer based on sodium titanate hollow microspheres assembled by nanotubes to stabilize zinc metal electrodes

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Journal of Energy Chemistry 2022年第8期31卷 539-546,I0015页

作者： Minfeng Chen weijun zhou Qinghua Tian Xiang Han Yanjun Tan Jizhang Chen Ching-Ping Wong Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037JiangsuChina Department of Chemistry School of SciencesZhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina Nanjing Sanle Group Co. Ltd.Nanjing 211800JiangsuChina School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

Recently,aqueous zinc-ion batteries with intrinsic safety,low cost,and environmental benignity have attracted tremendous research ***,zinc dendrites,harmful side reactions,and zinc metal corrosion stand in the ***,we use lepidocrocite-type sodium titanate hollow microspheres assembled by nanotubes to constitute an artificial solid electrolyte interface layer on the zinc metal *** to the hierarchical structure with abundant open voids,negative-charged layered framework,low hydrophilicity,electrically insulting nature,and large ionic conductivity,the sodium titanate coating layer can effectively homogenize the electric field,promote the Zn^(2+)ion transfer,guide the Zn^(2+)ion flux,reduce the desolvation barrier,improve the exchange current density,and accommodate the plated zinc ***,this coating layer can effectively suppress zinc dendrites and other unfavorable *** this coating layer,the Zn//Zn symmetric cell is able to provide an impressive cumulative zinc plating capacity of 1375 m Ah cm^(-2) at a current density of 5 m A cm^(-2).This coating layer also contributes to significantly improved electrochemical performances of Zn//MnO_(2) battery and zincion hybrid *** work offers new insights into the modifications of zinc metal electrodes.

关键词： Artificial SEI layers Hierarchical sodium titanates Interfacial stability Dendrite inhibition Aqueous Zn-ion batteries

Advances and perspectives on separators of aqueous zinc ion batteries

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Energy Reviews 2022年第1期1卷 34-42页

作者： Jizhang Chen Minfeng Chen Hong Ma weijun zhou Xinwu Xu College of Materials Science and Engineering Nanjing Forestry UniversityNanjing210037China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing210037China

With the advantages of intrinsic safety,good affordability,environmental friendliness,moderate energy density,and large power density,aqueous zinc ion batteries(AZIBs)have gained considerable research ***,zinc dendrites,hydrogen evolution,inert byproducts,and zinc metal corrosion severely hinder practical applications of *** order to address these issues,many research works have been carried out to modify the interface between zinc metal anode and aqueous *** fact,the interface engineering takes effect at the surface and near the surface of ***,a specialized review on the separators of AZIBs is still ***,basic requirements of separators and recent advances on the modification strategies including employment of functional groups,establishment of surface coatings,construction of hybrid architectures,regulations of porosity,and utilization of bipolar membrane are ***,the perspectives for further investigations on the separators of AZIBs are *** review could offer useful guidance for the future explorations of separators for AZIBs.

关键词： Aqueous Zn-ion batteries Separators Interfacial stability Dendrite inhibition Zn deposition

Role of interfacial electron transfer reactions on sulfamethoxazole degradation by reduced nontronite activating H_(2)O_(2)

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Journal of Environmental Sciences 2023年第2期124卷 688-698页

作者： Hao-Jie Cui Yaqi Ning CongWu Wei Peng Dong Cheng Lichu Yin weijun zhou Wenjuan Liao College of Resources and Environment Hunan Agricultural UniversityChangsha 410128China College of Environment Zhejiang University of TechnologyHangzhou 310014China

It has been documented that organic contaminants can be degraded by hydroxyl radicals(•OH)produced by the activation of H2O2 by Fe(II)-bearing ***,the interfacial electron transfer reactions between structural Fe(Ⅱ)and H_(2)O_(2) for•OH generation and its effects on contaminant remediation are *** this study,we first investigated the relation between•OH generation sites and sulfamethoxazole(SMX)degradation by activating H2O2 using nontronite with different reduction ***(5.2–16.9μmol/L)degradation first increased and then decreased with an increase in the reduction extent of nontronite from 22% to 62%,while the•OH production increased *** treatment of edge sites and structural variation results revealed that interfacial electron transfer reactions between Fe(Ⅱ)and H2O2 occur at both the edge and basal *** enhancement on basal plane interfacial electron transfer reactions in a high reduction extent rNAu-2 leads to the enhancement on utilization efficiencies of structural Fe(Ⅱ)and H_(2)O_(2) for•OH ***,the•OH produced at the basal planes is less efficient in oxidizing SMX than that of at edge *** of SMX could be sustainable in the H_(2)O_(2)/rNAu-2 system through chemically *** results of this study show the importance role of•OH generation sites on antibiotic degradation and provide guidance and potential strategies for antibiotic degradation by Fe(Ⅱ)-bearing clay minerals in H2O2-based treatments.

关键词： Reduced nontronite Electron transfer Sulfamethoxazole degradation Reaction sites Hydroxyl radicals

Intercellular adhesion molecule-5 protects PAJU cells during in vitro ischemia following cerebral infarction

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Neural Regeneration Research 2010年第3期5卷 205-208页

作者： weijun zhou Heping Yang Xiang Wang Yi Peng Dapeng WU Xiaojie Zhang Zhiping Hu Department of Neurology Second Xiangya Hospital Central South University Changsha 410011 Hunan Province China Department of Neurology Ruikang Hospital Affiliated to Guangxi Traditional Chinese Medical University Nanning 530011 Guangxi Zhuang Autonomous Region China Department of Psychiatry Second Xiangya Hospital Central South University Changsha 410011 Hunan Province China

BACKGROUND： Intercellular adhesion molecule-5 （ICAM-5） relieves the damage of beta-amyloid protein to PAJU cells, However, little is known about how ICAM-5 works as a neurotrophic factor, or whether ICAM-5 lessens neuronal damage under ischemic conditions following cerebral infarction. OBJECTIVE： To investigate the effects of ICAM-5 on PAJU cells growth in serum-free medium under ischemic conditions following cerebral infarction. DESIGN, TIME AND SETTING： The cytological in vitro study was performed at the Central Laboratory, Second Xiangya Hospital, Central South University, China, in June 2009. MATERIALS： Human ICAM-5 gene transfected into PAJU-TLN cells was supplied by the Life Science College, Helsinki University, Finland. Empty vector transfected PAJU-NEO cells were established by the Gene Center, Second Xiangya Hospital, Central South University, China. METHODS： PAJU-TLN cells transfected with human ICAM-5 or empty vector were incubated in serum-free medium. MAIN OUTCOME MEASURES： Phase contrast microscopy was used to observe changes in PAJU cell morphology. 3-（4, 5-dimethylthiazolzyl）-2, 5-diphenyltetrazolium bromide was used to determine cell viability. Hoechst 33258 was used to stain cell nuclei. Flow cytometry was utilized to measure the apoptosis rate of both PAJU-TLN and PAJU-NEO cells. RESULTS： Both PAJU-TLN and PAJU-NEO cells were injured by cultivating in serum-free medium, but the survival rate of PAJU-TLN cells was significantly higher. CONCLUSION： ICAM-5 protects PAJU-TLN cells from serum deprivation-induced apoptosis, induces the outgrowth of PAJU cells, and diminishes their morphologic impairment.

关键词： intercellular adhesion molecule-5 cerebral infarction serum deprivation neuroprotective effect brain injury

Liquid-phase sintering enabling mixed ionic-electronic interphases and free-standing composite cathode architecture toward high energy solid-state battery

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Nano Research 2022年第7期15卷 6156-6167页

作者： Xiang Han weijun zhou Minfeng Chen Linshan Luo Lanhui Gu Qiaobao Zhang Jizhang Chen Bo Liu Songyan Chen Wenqing Zhang College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037China Department of Physics Xiamen UniversityXiamen 361005China College of Mathematics and Physics Jinggangshan UniversityJi’an 343009China Department of Materials Science and Engineering College of MaterialsXiamen 361005China Department of Physics Southern University of Science and TechnologyShenzhen 518055China

Solid-state batteries(SSBs)will potentially offer increased energy density and,more importantly,improved safety for next generation lithium-ion(Li-ion)*** enabling technology is solid-state composite cathodes with high operating voltage and area *** composite cathode manufacturing technologies,however,suffer from large interfacial resistance and low active mass loading that with excessive amounts of polymer electrolytes and conductive ***,we report a liquidphase sintering technology that offers mixed ionic-electronic interphases and free-standing electrode architecture design,which eventually contribute to high area capacity.A small amount(~4 wt.%)of lithium hydroxide(LiOH)and boric acid(H_(3)BO_(3))with low melting point are utilized as sintering additives that infiltrate into single-crystal Ni-rich LiNi_(0.8)Mn_(0.1)Co_(0.1)(NMC811)particles at a moderately elevated temperature(~350℃)in a liquid state,which not only enable intimate physical contact but also promote the densification *** addition,the liquid-phase additives react and transform to ionic-conductive lithium boron oxide,together with the indium tin oxide(ITO)nanoparticle coating,mixed ionic-electronic interphases of composite cathode are successfully ***,the liquid-phase sintering performed at high-temperature(~800℃)also enables the fabrication of highly dense and thick composite cathodes with a novel free-standing *** promising performance characteristics of such composite cathodes,for example,delivering an area capacity above 8 mAh·cm^(−2) within a wide voltage window up to 4.4 V,open new opportunities for SSBs with a high energy density of 500 Wh·kg^(−1) for safer portable electronic and electrical transport.

关键词： solid-state battery single-crystal Ni-rich LiNi_(0.8)Mn_(0.1)Co_(0.1) liquid-phase sintering mixed ionic-electronic interphases freestanding architecture