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28篇 您的检索式:作者名="Li Yuanxing"
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1Photocatalysis:an overview of recent developments and technological advancements显示文摘Photocatalysis,which is the catalyzation of redox reactions via the use of energy obtained from light sources,is a topic that has garnered a lot of attention in recent years as a means of addressing the environmental and economic issues plaguing society today.Of particular interest are photosynthesis can potentially mimic a variety of vital reactions,many of which hold the key to develop sustainable energy economy.In light of this,many of the technological and procedural advancements that have recently occurred in the field are discussed in this review,namely those linked to:(1)photocatalysts made from metal oxides,nitride,and sulfides;(2)photocatalysis via polymeric carbon nitride(PCN);and(3)general advances and mechanistic insights related to TiO2-based catalysts.The challenges and opportunities that have arisen over the past few years are discussed in detail.Basic concepts and experimental procedures which could be useful for eventually overcoming the problems associated with photocatalysis are presented herein.Yuanxing Fang Yun Zheng Taofang Yong Chen Yaodong Zhu Qing Liang Hua Sheng Zhaosheng Li Chuncheng Chen Xinchen Wang 2020Science China Chemistry2020,63,2:7
2N-doped-carbon coated Ni2P-Ni sheets anchored on graphene with superior energy storage behavior显示文摘Transition metal phosphides (TMPs) have been widely studied as electrode materials for supercapacitors and lithium-ion batteries due to their high electrochemical reacti on activities. The practical applicati on of TMPs was gen erally hampered by their low con ductivity and large volume changes during electrochemical reactions. In this work, nitrogen-doped-carbon (NC) coated Ni2P-Ni hybrid sheets were fabricated and loaded into highly con ductive graphe ne n etwork, forming a Ni2P ?Ni@NC@G composite. The highly con ductive g raphe ne, the NC coati ng layer, and the decorated Ni nano particles in combi nation offer continu ous electro n tran sport cha nnels in the composite, resulti ng with facilitated electrode reaction kinetics and superior rate performance. Besides, the flexible graphene sheets and well-decorated Ni particles among Ni2P can effectively buffer the harmful stress during electrochemical reactions to maintain an integrated electrode structure. With these favorable features, the composite dem on strated superior capacitive and lithium storage behavior. As an electrode material for supercapacitors, the composite shows a remarkable capacitance of 2,335.5 F·g^-1 at 1 A·g^-1 and high capacitance retention of 86.4% after 2,000 cycles. Asymmetrical supercapacitors (ASCs) were also prepared with remarkable energy density of 53.125 Whk·g^-1 and power density of 3,750 Whk·g^-1. As an anode for lithium ion batteries, a high reversible capacity of 1,410 mAh·g^-1 can be delivered at 0.2 A·g^-1 after 200 cycles. Promising high rate capability was also demonstrated with a high discharge capacity of 750 mAh·g^-1 at 8 A·g^-1. This work shall pave the way for the production of other TMP materials for energy storage systems.Yuanxing Zhang Li Sun Liqi Bai Haochen Si Yu Zhang Yihe Zhang 2019Nano Research2019,12,3:3
3Revealing complex optical phenomena through vectorial metrics显示文摘Advances in vectorial polarization-resolved imaging are bringing new capabilities to applications ranging from fundamental physics through to clinical diagnosis.Imaging polarimetry requires determination of the Mueller matrix(MM)at every point,providing a complete description of an object’s vectorial properties.Despite forming a comprehensive representation,the MM does not usually provide easily interpretable information about the object’s internal structure.Certain simpler vectorial metrics are derived from subsets of the MM elements.These metrics permit extraction of signatures that provide direct indicators of hidden optical properties of complex systems,while featuring an intriguing asymmetry about what information can or cannot be inferred via these metrics.We harness such characteristics to reveal the spin Hall effect of light,infer microscopic structure within laser-written photonic waveguides,and conduct rapid pathological diagnosis through analysis of healthy and cancerous tissue.This provides new insight for the broader usage of such asymmetric inferred vectorial information.Chao He Jintao Chang Patrick S.Salter Yuanxing Shen Ben Dai Pengcheng Li Yihan Jin Samlan Chandran Thodik Mengmeng Li Aziz Tariq Jingyu Wang Jacopo Antonello Yang Dong Ji Qi Jianyu Lin Daniel S.Elson Min Zhang Honghui He Hui Ma Martin J.Booth 2022Advanced Photonics2022,4,2:2
4Strategic Significance of the 21^(st) Century Maritime Silk Road and Tactics in its Development显示文摘In a speech delivered at the Indonesian Parliament in October 2013,Chinese President Xi Jinping said:'we should further strengthen our maritime partnerships and jointly build the 21st century Maritime Silk Road',articulating China’s willingness to beef up maritime cooperation with ASEAN countries.The Decision of the Central Committee of the Communist Party of ChinaZhou Fangyin Li Yuanxing 2014International Understanding2014,,2:2
5Acetylation and carboxymethylation of the polysaccharide from Ganoderma atrum and their antioxidant and immunomodulating activities显示文摘Yi Chen Hui Zhang Yuanxing Wang Shaoping Nie Chang Li Mingyong Xie 2014Food Chemistry2014,,:1
6Mixotrophic cultivation of Platymonas subcordiformis显示文摘Xie Jiangli Zhang Yuanxing Li Yuangguang 2001J Appl Phycol2001,13,4:1
7Microstructure design and dissolution behavior between 2024 Al/Sn with the ultrasonic-associated soldering显示文摘Yuanxing Li Xuesong Leng Sheng Cheng Jiuchun Yan 2012Materials and Design2012,,:1
8Catalytic action of rare earth oxide(La_(2)O_(3),CeO_(2),Pr_(6)O_(11))on electrochemical oxidation of activated carbon in molten KOH-NaOH显示文摘The oxidation of anode carbon fuel directly affects the electrochemical performance of molten hydroxide direct carbon fuel cell(MHDCFC).In general,the anode carbon fuel can be oxidized at high temperature,thus the direct carbon fuel cell(DCFC)can show great electrochemical performance.In this study,rare earth oxides(La_(2)O_(3),CeO_(2),Pr_(6)O_(11))were prepared by the method of precipitation.Activated carbon was prepared by pretreatment of lignite.Rare earth oxides and activated carbon were mixed as anode carbon fuel,and rare earth oxides were used to catalyze the electrochemical oxidation of anode carbon fuel.The results show that CeO_(2)has better electrocatalytic activity compared with La_(2)O_(3)and Pr_(6)O_(11) in the MHDCFC.The electrochemical test results show that the current density(at 0.4 V)increases from 81.02 to 112.90 mA/cm^(2)and the maximum power density increases from 34.78 to 47.05 mW/cm^(2)at 450℃,when the mass fraction of CeO_(2)is increased from 0 to 40%.When the mass fraction of CeO_(2)is 30%,the current density(82.55 mA/cm^(2)at 0.4 V)at 400℃is higher than that(81.02 mA/cm^(2)at 0.4 V)without CeO_(2)at 450℃.The electrochemical oxidation mechanism of CeO_(2)catalyzed anode carbon fuel is discussed.Xiaofeng Li Yuanxing Dong Xiaohui Liu Lijun Li Yanfang Gao Zhenzhu Cao Jinrong Liu 2022Journal of Rare Earths2022,40,7:1
9Fed-batch culture of hybridoma cells in serum-free medium using an optimized feeding strategy显示文摘Zhang Li Shen Hong Zhang Yuanxing 2004Journal of Chemical Technology and Biotechnology2004,79,2:1
10Improvement of hepatitis B surface antigen expression by dimethyl sulfoxide in the culture of recombinant Chinese hamster ovary cells 显示文摘Li Junhui Sun Xiangming Zhang Yuanxing 2006Process Biochem2006,41,:1
11On the equivalence of McElieces and Niederreiters public-key cryptosystems显示文摘LI YUANXING DEN R H WANG XINMEI 1994IEEE Transactions on Information Theory1994,40,1:1
12Mechanisms of water oxidation on heterogeneous catalyst surfaces显示文摘Water oxidation,an essential step in photosynthesis,has attracted intense research attention.Understanding the reaction pathways at the electrocatalyst/water interface is of great importance for the development of water oxidation catalysts.How the water is oxidized on the electrocatalyst surface by the positive charges is still an open question.This review summarizes current advances in studies on surface chemistry within the context of water oxidation,including the intermediates,reaction mechanisms,and their influences on the reaction kinetics.The Tafel analyses of some electrocatalysts and the rate-laws relative to charge consumption rates are also presented.Moreover,how the multiple charge transfer relies on the intermediate coverage and the accumulated charge numbers is outlined.Lastly,the intermediates and rate-determining steps on some water oxidation catalysts are discussed based on density functional theories.Xiaogang Yang Yuanxing Wang Chang Ming Li Dunwei Wang 2021Nano Research2021,14,10:1
13Investigation on hydrate growth at the oil–water interface:In the presence of asphaltene显示文摘Natural gas hydrates can readily form in deep-water oil production processes and pose a great threat to the oil industry.Moreover,the coexistence of hydrate and asphaltene can result in more severe challenges to subsea flow assurance.In order to study the effects of asphaltene on hydrate growth at the oil-water interface,a series of micro-experiments were conducted in a self-made reactor,where hydrates nucleated and grew on the surface of a water droplet immersed in asphaltene-containing oil.Based on the micro-observations,the shape and growth rate of the hydrate shell formed at the oil-water interface were mainly investigated and the effects of asphaltene on hydrate growth were analyzed.According to the experimental results,the shape of the water droplet and the interfacial area changed significantly after the formation of the hydrate shell when the asphaltene concentration was higher than a certain value.A mechanism related to the reduction of the interfacial tension caused by the absorption of asphaltenes on the interface was proposed for illustration.Moreover,the growth rate of the hydrate shell decreased significantly with the increasing asphaltene concentration under experimental conditions.The conclusions of this paper could provide preliminary insight how asphaltene affect hydrate growth at the oil-water interface.Guangchun Song Yuanxing Ning Yuxing Li Wuchang Wang 2022Chinese Journal of Chemical Engineering2022,35,5:1
14Bimetallic NiCo2S4 Nanoneedles Anchored on Mesocarbon Microbeads as Advanced Electrodes for Asymmetric Supercapacitors显示文摘Bimetallic Ni–Co sulfides are outstanding pseudocapacitive materials with high electrochemical activity and excellent energy storage performance as electrodes for high-performance supercapacitors.In this study,a novel urchin-like NiCo2S4@mesocarbon microbead(NCS@MCMB) composite with a core–shell structure was prepared by a facile two-step hydrothermal method.The highly conductive MCMBs offered abundant adsorption sites for the growth of NCS nanoneedles,which allowed each nanoneedle to fully unfold without aggregation,resulting in improved NCS utilization and efficient electron/ion transferin the electrolyte.When applied as an electrode material for supercapacitors,the composite exhibited a maximum specific capacitance of 936 Fg-1 at 1 Ag-1 and a capacitance retention of 94% after 3000 cycles at 5 Ag-1,because of the synergistic effect of MCMB and NCS.Moreover,we fabricated an asymmetric supercapacitor based on the NCS@MCMB composite,which exhibited enlarged voltage windows and could power a light-emitting diode device for several minutes,further demonstrating the exceptional electrochemical performance of the NCS@MCMB composite.Yu Zhang Yihe Zhang Yuanxing Zhang Haochen Si Li Sun 2019Nano-Micro Letters2019,11,2:1
15Mixotrophic cultivation of Platymonas subcordiformas 显示文摘Xie Jingli Zhang Yuanxing Li yuanguang 2001Journal of Phycology2001,13,:1
16Error analysis of laser beam quality measured with CCD sensor and choice of the optimal threshold显示文摘Yuanxing He Xinyang Li 2013Optics & Laser Technology2013,45,:1
17Preventing formation of intermetallic compounds in ultrasonic-assisted Sn soldering of Mg/Al alloys through pre-plating a Ni coating layer on the Mg substrate显示文摘Magnesium and aluminum alloys are widely used in various industries because of their excellent properties,and their reliable connection may increase application of materials.Intermetallic compounds(IMCs)affect the joint performance of Mg/Al.In this study,AZ31 Mg alloy with/without a nickel(Ni)coating layer and 6061 Al alloy were joined by ultrasonic-assisted soldering with Sn-3.0Ag-0.5Cu(SAC)filler.The effects of the Ni coating layer on the microstructure and mechanical properties of Mg/Al joints were systematically investigated.The Ni coating layer had a significant effect on formation of the Mg_(2)Sn IMC and the mechanical properties of Mg/Al joints.The blocky Mg_(2)Sn IMC formed in the Mg/SAC/Al joints without a Ni coating layer.The content of the Mg_(2)Sn IMC increased with increasing soldering temperature,but the joint strength decreased.The joint without a Ni coating layer fractured at the blocky Mg_(2)Sn IMC in the solder,and the maximum shear strength was 32.2 MPa.By pre-plating Ni on the Mg substrate,formation of the blocky Mg_(2)Sn IMC was inhibited in the soldering temperature range 240–280℃and the joint strength increased.However,when the soldering temperature increased to 310℃,the blocky Mg_(2)Sn IMC precipitated again in the solder.Transmission electron microscopy showed that some nano-sized Mg_(2)Sn IMC and the(Cu,Ni)_(6)Sn_(5)phase formed in the Mg(Ni)/SAC/Al joint soldered at 280℃,indicating that the Ni coating layer could no longer prevent diffusion of Mg into the solder when the soldering temperature was higher than 280℃.The maximum shear strength of the Mg(Ni)/SAC/Al joint was 58.2 MPa for a soldering temperature of 280℃,which was 80.7%higher than that of the Mg/SAC/Al joint,and the joint was broken at the Mg(Ni)/SAC interface.Pre-plating Ni is a feasible way to inhibit formation of IMCs when joining dissimilar metals.Yingzong Liu Yuanxing Li Hui Chen Zongtao Zhu 2024Journal of Magnesium and Alloys2024,12,2:0
18Facilitating Local Economic Development through Efforts that Center on National Diplomatic Strategies显示文摘Weifang City of Shandong Province is the birthplace of the kite,and is the City of Kite known across the world.In recent years,the city has been actively engaged in international exchanges.We kicked off these exchanges with activities related to kites and then expanded international economic and trade cooperation.Bearing in mind the nationalSun Qisheng Li Yuanxing 2014International Understanding2014,,4:0
19Reduced graphene oxide-modified Ni Co-phosphates on Ni foam enabling high areal capacitances for asymmetric supercapacitors显示文摘NiCo-phosphates can deliver high specific capacitances and high electrochemical activities as pseudocapacitive electrode material for supercapacitors.In this study,The NiCo-phosphates@reduced graphene oxide(NCPO@rGO)composite is directly loaded on Ni foam by a simple one-step hydrothermal process.The conductive rGO sheets provides continuous electron pathways between NCPO flowers and Ni foam,allowing active electrochemical reactions throughout the whole electrode.This can solve the difficulty of low active material utility and small areal capacitances in the Ni foam-supported electrodes.At the same time,the rGO sheets creates large amount of mesopores within the electrode,which can ensure a highly open structure for electrolyte attachment and ion transport.Because of the positive effect of rGO in improving charge transfe r,the NiCo-phosphates can be fully involved in the electrochemical reactions with high utility,ensuring high specific capacitances(1416.7 F g^(-1)at 1 A g^(-1))and high-rate performances.Specially,the areal capacitance of the NCPO@rGO electrode can reach as large as 3.69 F cm^(-2)at 1 A g^(-1),which is among the highest ones in Ni foam supported electrodes.An asymmetric supercapacitor is then fabricated by NCPO@rGO as the positive material with attractive energy densities and power densities,further proving its excellent electrochemical performance.Chao Sun Li Sun Yuanxing Zhang Haochen Si Kaifeng Fan Yan Shi Jialin Gu Yihe Zhang 2021Journal of Materials Science & Technology2021,,31:0
20Roles of Metal-Free Materials in Photoelectrodes for Water Splitting显示文摘CONSPECTUS:Photoelectrochemical(PEC)water splitting is an appealing approach to the hydrogen evolution reaction since it converts sunlight in the form of hydrogen fuel,which has the potential to revolutionize the fossil fuel-based energy systems of the modern society.In the last half century,progress has been made with respect to the material,synthesis,and system.Recent developments of multilayered photoelectrodes have made a breakthrough to improve the sunlight conversion efficiency and strengthen the physiochemical stability.The exploration of new materials for the functional layers of photoelectrodes offers a new opportunity for practical application.Among the emerging materials,metal-free species have shown superior properties,such as high stability,sustainability,and renewability.With respect to inorganic materials,their physiochemical properties can be readily regulated,including thermodynamics and kinetics,and thus increasing attention has been devoted.Xiaochun Li Jiawen Wang Yuanxing Fang Hong Zhang Xianzhi Fu Xinchen Wang 2021Accounts of Materials Research2021,2,10:0
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