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Fabrication of Gd_(2)O_(3)-doped CeO_(2)thin films through DC reactive sputtering and their application in solid oxide fuel cells

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International Journal of Minerals,Metallurgy and Materials 2023年第6期30卷 1190-1197页

作者： Fuyuan Liang Jiaran Yang Haiqing Wang junwei wu School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

Physical vapor deposition(PVD)can be used to produce high-quality Gd_(2)O_(3)-doped CeO2(GDC)*** various PVD methods,reactive sputtering provides unique benefits,such as high deposition rates and easy upscaling for industrial *** thin films were successfully fabricated through reactive sputtering using a Gd_(0.2)Ce_(0.8)(at%)metallic target,and their application in solid oxide fuel cells,such as buffer layers between yttria-stabilized zirconia(YSZ)/La0.6Sr0.4Co0.2Fe0.8O_(3−δ)and as sublayers in the steel/coating system,was ***,the direct current(DC)reactive-sputtering behavior of the GdCe metallic target was ***,the GDC films were deposited on NiO-YSZ/YSZ half-cells to investigate the influence of oxygen flow rate on the quality of annealed GDC *** results demonstrated that reactive sputtering can be used to prepare thin and dense GDC buffer layers without high-temperature ***,the cells with a sputtered GDC buffer layer showed better electrochemical performance than those with a screen-printed GDC buffer *** addition,the insertion of a GDC sublayer between the SUS441 interconnects and the Mn-Co spinel coatings contributed to the reduction of the oxidation rate for SUS441 at operating temperatures,according to the area-specific resistance tests.

关键词： solid oxide fuel cell physical vapor deposition Gd2O3-doped CeO_(2) metallic interconnects electrical conductivity

Code recommendation for Android development:how does it work and what can be improved?

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Science China(Information Sciences) 2017年第9期60卷 149-162页

作者： junwei wu Liwei SHEN wunan GUO Wenyun ZHAO School of Computer Science Fudan University Shanghai Key Laboratory of Data Science Fudan University

Android applications are developed based on framework and are always pattern-based. For Android developers, they can be facilitated by code recommendation to ensure high development efficiency and *** research work has proposed several methods and tools to support recommendation in diverse ***, how code recommendation work in Android development and what can be further improved to better support Android development has not been clarified. To understand the reality, we conduct a qualitative review on current code recommendation techniques and tools reported in prime literature. The collected work is first grouped into three categories based on a multidimensional framework. Then the review is performed to draw a comprehensive image of the adoption of recommendation in Android development when meeting specific development requirements. Based on the review, we give out possible improvements of code recommendation from two aspects. First, a set of improvement suggestions are presented to enhance the ability of the state-ofthe-art code recommendation techniques. Second, a customizable tool framework is proposed to facilitate the design of code recommendation tools and the tool framework is able to integrate the recommendation features more easily.

关键词： Android code recommendation code search code suggestion code completion code generation

Effects of ancillary ligands in acceptorless benzyl alcohol dehydrogenation mediated by phosphine-free cobalt complexes

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Frontiers of Chemical Science and Engineering 2023年第3期17卷 314-325页

作者： Yan Xu Lu Wang junwei wu Guanzhong Zhai Daohua Sun Department of Chemical and Biochemical Engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Department of Chemical and Biochemical Engineering National Engineering Laboratory for Green Chemical Productions of Alcohols−Ethers−EstersCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Luoyang Ship Material Institute Luoyang 471039China

Acceptorless alcohol dehydrogenation stands out as one of the most promising strategies in hydrogen storage *** various catalytic systems for this reaction,cost-effective molecular catalysts using phosphine-free ligands have gained considerable ***,the central challenge for using non-precious metals is to overcome the propensity of reacting by oneelectron ***,we synthesized a phosphine-freeη^(5)-C_(5)Me_(5)-Co complex by using the metal-ligand cooperative strategy and compared its activity with analogous catalysts toward acceptorless alcohol *** catalyst showed excellent performance with a turnover number of 130.4 and a selectivity close to 100%.The improved performance among the class ofη^(5)-C_(5)Me_(5)-Co complexes could be attributed to the more accessible Co center and its cooperation with the redox-active *** further study the systematic structure-activity relationship,we investigated the electronic structures ofη^(5)-C_(5)Me_(5)-Co complexes by a set of *** results showed that the redox-active ligand has a significant influence on theη^(5)-C_(5)Me_(5)-Co *** the meantime,the proximal O−/OH group is beneficial for shuttling *** the catalytic cycle,two dehydrogenation scenarios were interrogated through density functional theory,and the result suggested that the outer-sphere pathway was *** formation of a dihydrogen complex was the rate-determining step with aΔG value of 16.9 kcal∙mol‒*** electron population demonstrated that theη^(5)-C_(5)Me_(5)ligand played a key role in stabilizing transition states during dehydrogenation *** work identified the roles of vital ligand components to boost catalytic performance and offered rationales for designing metal-ligand cooperative nonprecious metal complexes.

关键词： acceptorless alcohol dehydrogenation η^(5)-C_(5)Me_(5)-Co metal-ligand cooperation theoretical calculation

Advances on Na-K liquid alloy-based batteries

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Journal of Energy Chemistry 2022年第8期31卷 313-323,I0009页

作者： junwei wu Zhuang Xue Lixuan Yuan Jilei Ye Qinghong Huang Lijun Fu Yuping wu State Key Laboratory of Materials-Oriented Chemical Engineering College of Energy Science and EngineeringNanjing Tech UniversityNanjing 211816JiangsuChina

Sodium-potassium(Na^(-)K)liquid alloys attract increasing research attention,as an ideal alternative of Li metal for metal-based batteries,attributing to their high abundance,low redox potential,high capacity,and dendrite-free *** addition,the liquid and self-healing features of Na^(-)K alloys endow good electrode/electrolyte interfacial *** recent advances on the Na^(-)K liquid alloy-based batteries(NKBs)are reviewed *** anode designs for immobilization of the liquid alloy are *** influences of the electrolyte and cathode materials on the battery performances are *** addition,considering the co-existence of both K^(+)and Na^(+)in the electrolyte,the working mechanisms of the NKBs are *** also show that despite the improvement,challenges of the NKBs *** compatibility between Na^(-)K liquid alloy and electrolyte,as well as disputed working mechanisms,request detailed surface analyses of the liquid alloy and local element distribution evolution in the *** review would shed light on the fundamental understanding of Na^(-)K alloy electrochemistry and the development of dendrite-free metal-based energy storage systems with high energy density.

关键词： Sodium-potassium alloy Liquid anode Metal battery Dendrite-free Mechanism

An iron-catalyzed multicomponent reaction of cycloketone oxime esters, alkenes, DABCO·(SO_(2))_(2) and trimethylsilyl azide

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Organic Chemistry Frontiers 2022年第4期9卷 917-922页

作者： Jun Zhang junwei wu Xiaotong Chang Peiqi Wang Jiemin Xia Jie wu School of Pharmaceutical and Materials Engineering&Institute for Advanced Studies Taizhou UniversityJiaojiang 318000ZhejiangChina State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of Sciences345 Lingling RoadShanghai 200032China School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007China

An iron-catalyzed four-component reaction of cycloketone oxime esters,alkenes,DABCO·(SO_(2))_(2) and tri-methylsilyl azide(TMSN_(3))is *** multicomponent radical transformation presents excellent regio-and chemoselectivity,leading to a range of β-azidosulfones in moderate to excellent *** this protocol,the utilization of a sulfur dioxide surrogate of DABCO·(SO_(2))_(2) as the source of the sulfonyl group enables the reaction to proceed efficiently under mild conditions without the need for strong ***,the products can be transformed intoβ-aminosulfones and other valuable sulfonyl-contain-ing nitrogen heterocycles.

关键词： azide ketone esters

A flexible solid polymer electrolyte enabled with lithiated zeolite for high performance lithium battery

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Nano Research 2023年第7期16卷 9443-9452页

作者： Zhiyu Ding Qiming Tang Qi Zhang Penghui Yao Xingjun Liu junwei wu Shenzhen Key Laboratory of Advanced Materials Department of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China Maryland Energy Innovation Institute University of MarylandCollege ParkMD 20742USA Department of Chemical and Metallurgical Engineering Aalto UniversityKemistintie 1Aalto FI-00076Finland

Solid-state lithium batteries using composite polymer electrolytes(CPEs)have attracted much attention owing to their higher safety compared to liquid electrolytes and flexibility compared to ceramic ***,their unsatisfactory lithium-ion conductivity still limits their ***,a high ion conductive CPE with multiple continuous lithium pathways is *** new electrolyte consists of poly(vinylidene fluorideco-hexafluoropropylene)(PVDF-HFP)and lithiated X type zeolite(Li-X),which possesses a high ionic conductivity(1.98×10^(-4)S/cm),high lithium transference number(t_(Li^(+))=0.55),wide electrochemical window(4.7 V),and excellent stability against the lithium *** functional theory(DFT)calculation confirms that the Lewis acid sites in zeolite can graft with N,N-dimethylformamide(DMF)and PVDF-HFP chains,resulting in decreased crystallinity of polymer and providing rapid Li+transmission *** used in a full cell,the solid Li|Li-X-3%|LiFePO_(4) cell displays excellent cycling stability and rate performance at room temperature and 60℃.Furthermore,pouch cells with the Li-X-3%electrolyte exhibit brilliant safety under extreme conditions,such as folding and ***,this proposed zeolite-PVDF-HFP CPE represents a promising potential in the application of making a safer,higher performing,and flexible solid-state lithium battery.

关键词： solid-state lithium batteries composite polymer electrolytes zeolite poly(vinylidene fluorideco-hexafluoropropylene)(PVDF-HFP) flexible

Flexible aqueous Ca-ion full battery with super-flat discharge voltage plateau

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Nano Research 2022年第1期15卷 701-708页

作者： Panpan Wang Hua Wang Zhe Chen junwei wu Jingting Luo Yan Huang School of Materials Science and Engineering Shenzhen UniversityShenzhen 518055China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyShenzhen 518055China Flexible Printed Electronic Technology Center Harbin Institute of TechnologyShenzhen 518055China School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518055China

Recently,multivalent metal-ion batteries have attracted considerable interests on the merits of their natural abundance and multielectron redox ***,the development of Ca-ion battery is still in their preliminary stage because of the lack of suitable electrode *** Ca-storage performance of the existing materials is still unsatisfactory with low capacity,poor cyclic stability,as well as sloping discharge profiles,which cannot provide stable energy *** this work,transition metal oxide Sn-doped In2O3(ITO)has been explored as the aqueous Ca-ion battery anode,which could deliver a high discharge capacity of 71.2 mAh·g^(-1) with an ultra-flat discharge voltage *** Ca storage mechanism was revealed to be reversible conversion reaction based on ex-situ X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),and transmission electron microscopy(TEM)characterizations.A flexible aqueous Ca-ion battery was subsequently assembled with zinc hexacyanoferrate(ZnHCF)cathode and ITO anode sandwiched by hydrogel electrolyte,which could deliver a high specific capacity of 75.3 mAh·g^(-1) at 0.4 A·g^(-1) with a flat output voltage plateau at around 0.8 *** bendable and flexible Ca-ion battery with decent voltage output will pave the way for the energy storage devices towards practical applications in flexible and wearable electronics.

关键词： multivalent metal ion battery aqueous Ca-ion battery voltage plateau ln2O3(ITO) flexible and wearable

Study on hepatoprotective effect of peptide S-8300 from shark liver

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World Journal of Gastroenterology 2005年第12期11卷 1809-1812页

作者： Feng-JieHuang Zheng-BingLv QianLi Li-junwei LiangZhang wu-Tongwu SchoolofLifeScienceandTechnology ChinaPharmaceuticalUniversityNanjing210009JiangsuProvinceChina

AIM: To explore the effects of peptide S-8300 from shark liver (S-8300) on liver function as well as in regulating immune functions in experimental injury models. METHODS: Mice were administered with different doses of S-8300 for four consecutive days, followed by mice injected with tetrachloromethane (CCI4) on d 3. The activity of ALT, AST, LDH, SOD and contents of MDA and GSH in the mice liver were tested. And mice were treated with Cy (100 mg/kg) at the beginning of the experiment to induce immunosuppression model. The S-8300 groups were treated with S-8300 seven days after the beginning of Cy administration. The effects of S-8300 on the formulation of serum hemolysin and the content of IL-2 in serum in the immunosuppression mice were observed. RESULTS: S-8300 obviously decreased the level of ALT (52.2±11.0 U/dL vs135.9±6.5 U/dL, P<0.01), AST (67.5±6.9 U/dL vs 238.8±8.7 U/dL, P<0.01), LDH (155.1±46.8 U/dL vs 240.4±6.0 U/dL, P<0.01) & MDA (0.64?.027 nmol/mg vs 1.06±0.040 nmol/mg, P<0.01) and increased SOD (24.51±1.01 U/mg vs 19.05±0.73 U/mg, P<0.01) & GSH (24.17±0.91 μg/mg vs 14.93±0.45 μg/mg, P<0,01) in mice liver damaged by CCI4. S-8300 also markedly improved the formulation of serum hemolysin (0.094±0.005 A540 vs 0.063±0.006 A540, P<0.01) and increased the level of IL-2 (9.74±1.16 pg/mL vs 5.81±0.87 pg/mL, P<0.01) in serum of the immunosuppression mice. CONCLUSION: The results suggested S-8300 has significant hepatoprotective, immunomodulatory and inhibiting of lipid peroxidation activity.

关键词： CCl4 Immunosuppression IL-2 Hepatopratective Serum hemolysin

Recent advances in modification strategies of silicon-based lithiumion batteries

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Nano Research 2023年第3期16卷 3781-3803页

作者： Wenlei Wang Yu Wang Lixuan Yuan Chaolin You junwei wu Lili Liu Jilei Ye Yunling wu Lijun Fu State Key Laboratory of Materials-Oriented Chemical Engineering School of Energy Science and EngineeringNanjing Tech UniversityNanjing 211816China

As potential alternatives to graphite,silicon(Si)and silicon oxides(SiO_(x))received a lot of attention as anode materials for lithiumion batteries owing to their relatively low working potentials,high theoretical specific capacities,and abundant ***,the commercialization of Si-based anodes is greatly hindered by their massive volume expansion,low conductivity,unstable solid electrolyte interface(SEI),and low initial Coulombic efficiency(ICE).Continuous endeavors have been devoted to overcoming these challenges to achieve practical *** review is centered on the major challenges and latest developments in the modification strategies of Si-based anodes,including structure optimization,surface/interface regulation,novel binders,and innovative design of ***,outlooks and perspectives of Si-based anodes for future development are presented.

关键词： lithium-ion batteries silicon silicon oxides modification strategies