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Tungsten oxide-anchored Ru clusters with electron-rich and anti-corrosive microenvironments for efficient and robust seawater splitting

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SusMat 2024年第1期4卷 106-115页

作者： Yiming Zhang Weiqiong Zheng Huijuan Wu Ran Zhu Yinghan Wang Mao Wang Tian Ma chong cheng Zhiyuan Zeng Shuang Li College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengduChina Department of Chemical and Biomolecular Engineering National University of SingaporeSingaporeSingapore Department of Materials Science and Engineering and State Key Laboratory of Marine PollutionCity University of Hong KongKowloonHong KongChina Shenzhen Research Institute City University of Hong KongShenzhenChina

Ruthenium(Ru)has been recognized as a prospective candidate to substitute platinum catalysts in water-splitting-based hydrogen production.However,minimizing the Ru contents,optimizing the water dissociation energy of Ru sites,and enhancing the long-term stability are extremely required,but still face a great challenge.Here,we report on creating tungsten oxide-anchored Ru clusters(Ru-WO_(x))with electron-rich and anti-corrosive microenvironments for efficient and robust seawater splitting.Benefiting from the abundant oxygen vacancy structure in tungsten oxide support,the Ru-WO_(x)exhibits strong Ru-O and Ru-W bonds at the interface.Our study elucidates that the strong Ru-O bonds in Ru-WO_(x)may accelerate the water dissociation kinetics,and the Ru-W bonds will lead to the strong metal-support interaction and electrons transfer fromWto Ru.The optimal Ru-WO_(x)catalysts exhibit a low overpotential of 29 and 218mVat the current density of 10 mA cm^(−2) in alkaline and seawater media,respectively.The outstanding long-term stability discloses that the Ru-WO_(x)catalysts own efficient corrosion resistance in seawater electrolysis.We believe that thiswork offers new insights into the essential roles of electron-rich and anti-corrosivemicroenvironments in Ru-based catalysts and provide a new pathway to design efficient and robust cathodes for seawater splitting.

关键词： hydrogen production microenvironment modulation noble metal catalysts seawater splitting tungsten oxide

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A substructure approach for analyzing pile foundation and soil vibrations due to train running over viaduct and its validation

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Railway Engineering Science 2022年第4期30卷 468-481页

作者： Ying Wu Xuecheng Bian chong cheng Jianqun Jiang Department of Civil Engineering MOE Key Laboratory of Soft Soils and Geoenvironmental EngineeringZhejiang UniversityAnzhong Building of Civil Engineering B406Zijingang CampusHangzhou 310058China

An efficient computational approach based on substructure methodology is proposed to analyze the viaduct-pile foundation-soil dynamic interaction under train loads.Thetrain-viaductsubsystemissolvedusingthe dynamic stiffness integration method,and its accuracy is verified by the existing analytical solution for a moving vehicle on a simply supported beam.For the pile foundation-soil subsystem,the geometric and material properties of piles and soils are assumed to be invariable along the azimuth direction.By introducing the equivalent stiffness of grouped piles,the governing equations of pile foundation-soil interaction are simplified based on Fourier decomposition method,so the three-dimensional problem is decomposedintoseveraltwo-dimensionalaxisymmetricfinite element models.The pile foundation-soil interaction model is verified by field measurements due to shaker loading at pile foundation top.In addition,these two substructures are coupled with the displacement compatibility condition at interface of pier bottom and pile foundation top.Finally,the proposed train-viaduct-pile foundation-soil interaction model was validated by field tests.The results show that the proposed model can predict vibrations of pile foundation and soil accurately,thereby providing a basis for the prediction of pile-soil foundation settlement.The frequency spectra of the vibration in Beijing-Tianjin high-speed railway demonstrated that the main frequencies of the pier top and ground surface are below 100 and 30 Hz,respectively.

关键词： Train moving load Viaduct Pile foundation Soil Vibration Substructure method

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Inner-pore reduction nucleation of palladium nanoparticles in highly conductive wurster-type covalent organic frameworks for efficient oxygen reduction electrocatalysis

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Journal of Energy Chemistry 2023年第2期77卷 543-552,I0014页

作者： Weiwen Wang Lu Zhang Tianping Wang Zhen Zhang Xiangnan Wang chong cheng Xikui Liu College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065SichuanChina

Covalent organic frameworks(COFs)have emerged as a class of promising supports for electrocatalysis because of their advantages including good crystallinity,highly ordered pores,and structural diversity.However,their poor conductivity represents the main obstruction to their practical application.Here,we reported a novel synthesis strategy for synergistically endowing a triphenylamine-based COFs with improved electrical conductivity and excellent catalytic activity for oxygen reduction,via the in-situ redox deposition and confined growth of palladium nanoparticles inside the porous structure of COFs using reductive triphenylamine frameworks as reducing agent;meanwhile,the triphenylamine unit was oxidized to radical cation structure and affords radical cation COFs with conductivity as high as3.2*10^(-1) S m^(-1).Such a uniform confine palladium nanoparticle on highly conductive COFs makes it an efficient electrocatalyst for four-electron oxygen reduction reaction(4e-ORR),showing excellent activities and fast kinetics with a remarkable half-wave potential(E_(1/2))of 0.865 V and an ultralow Tafel slope of 39.7 mV dec^(-1) in alkaline media even in the absence of extra commercial conductive fillers.The generality of this strategy was proved by preparing the different metal and metal alloy nanoparticles supported on COFs(Au@COF,Pt@COF,AuPd@COF,AgPd@COF,and PtPd@COF)using reductive triphenylamine frameworks as reducing agent.This work not only provides a facile strategy for the fabrication of highly conductive COF supported ORR electrocatalysts,but also sheds new light on the practical application of Zn-air battery.

关键词： Covalent organic frameworks Wurster-type structure In-situ reduction nucleation Palladium nanoparticles Oxygen reduction electrocatalysis

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Phosphorus modulated porous CeO_(2)nanocrystallines for accelerated polysulfide catalysis in advanced Li-S batteries

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Journal of Materials Science & Technology 2022年第36期131卷 212-220页

作者： Xuefeng Tao Zhao Yang Menghao cheng Rui Yan Fan Chen Sujiao Cao Shuang Li Tian Ma chong cheng Wei Yang College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China Department of Ultrasound National Clinical Research Center for GeriatricsWest China HospitalSichuan UniversityChengdu 610041China

The insulating nature of sulfur species,sluggish reaction kinetics,and uncontrolled dissolution of lithium polysulfide(LiPS)intermediates during the complex and multiphase sulfur redox process,have severely inhibited the applications of Li-S batteries.In this study,we report a rational strategy to accelerate the polysulfide catalysis via constructing phosphorus modulated porous CeO_(2)(P-CeO_(2))for advanced Li-S batteries.The morphology and surface analysis demonstrate that the P-CeO_(2)consists of abundant Pmodulated porous CeO_(2)nanocrystallines.The battery performance reveals that the introduction of P will lead to an improved initial capacity of 1027 mA hg^(-1)than that of bare CeO_(2)(895.7 mA hg^(-1))at 0.2 C.In addition,the P-CeO_(2)cathode can maintain a low capacity decay ratio of 0.10%per cycle after 500 cycles at 1.0 C.The coin battery tests suggest that the P-CeO_(2)cathode presents faster oxidation-reduction kinetics of LiPS and quick diffusion of Li^+ions.Meanwhile,the studies of redox processes and chemical interactions of LiPS have demonstrated the P-CeO_(2)cathode displays stronger adsorption of Li_(2)S_(6),higher redox peak current,and earlier precipitation of Li_(2)S than the bare CeO_(2).This study demonstrates for the first time that the P-modulation of metal oxide surface can simultaneously promote the catalytic reaction kinetics and chemical interaction of LiPS.We anticipate that this P-modulation method can be extended to many other nanostructured metal catalytic sites for developing affordable advanced Li-S batteries.

关键词： Metal oxides P-modulated porous CeO_(2) Polysulfide catalytic materials Shuttle effects Lithium-sulfur batteries

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Oxygen-modulated metal nitride clusters with moderate binding ability to insoluble Li_(2)S_(x) for reversible polysulfide electrocatalysis

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InfoMat 2023年第4期5卷 1-13页

作者： Menghao cheng Zhenyu Xing Rui Yan Zhenyang Zhao Tian Ma Mi Zhou Xikui Liu Shuang Li chong cheng College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengduthe People's Republic of China College of Biomass Science and Engineering Sichuan UniversityChengduthe People's Republic of China

Multiphase sulfur redox reactions with advanced homogeneous and heterogeneous electrochemical processes in lithium–sulfur(Li–S)batteries possess sluggish kinetics.The slow kinetics leads to significant capacity decay during charge/discharge processes.Therefore,electrocatalysts with adequate sulfurredox properties are required to accelerate reversible polysulfide conversion in cathodes.In this study,we have fabricated an oxygen-modulated metal nitride cluster(C-MoN_(x)-O)that has a moderate binding ability to the insoluble Li_(2)S_(x)for reversible polysulfide electrocatalysis.A Li–S battery equipped with CMoN_(x)-O electrocatalyst displayed a high discharge capacity of 875 mAh g^(-1)at 0.5 C.The capacity decay rate of each cycle was only 0.10%after 280 cycles,which is much lower than the control groups(C-MoO_(x):0.16%;C-MoN_(x):0.21%).Kinetic studies and theoretical calculations suggest that C-MoN_(x)-O electrocatalyst presents a moderate binding ability to the insoluble Li_(2)S_(2)and Li_(2)S when compared to the C-MoO_(x)and C-MoN_(x)surfaces.Thus,the C-MoN_(x)-O can effectively immobilize and reversibly catalyze the solid–solid conversion of Li_(2)S_(2)–Li_(2)S during charge–discharge cycling,thus promoting reaction kinetics and eliminating the shuttle effect.This study to design oxygen-doped metal nitrides provides innovative structures and reversible solid–solid conversions to overcome the sluggish redox chemistry of polysulfides.

关键词： electrocatalysts lithium-sulfur batteries metal nitride reversible polysulfide catalysis shuttle effects Menghao cheng

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High‑Valence Transition Metal Modified FeNiV Oxides Anchored on Carbon Fiber Cloth for Efficient Oxygen Evolution Catalysis

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Advanced Fiber Materials 2022年第4期4卷 774-785页

作者： Zihe Wu Jiehui Yang Wenjie Shao Menghao cheng Xianglin Luo Mi Zhou Shuang Li Tian Ma chong cheng Changsheng Zhao College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China College of Biomass Science and Engineering Textile InstituteSichuan UniversityChengdu 610065China Department of Ultrasound West China HospitalSichuan UniversityChengdu 610065China

Developing efficient and durable non-noble metal-based oxygen evolution catalysts is of great importance for electrochemical water splitting.Here,we report a new and facile strategy for controllable synthesis of high-valence Mo modified FeNiV oxides as efficient OER catalysts.The Mo-dopant displays a significant influence on the valence state of Fe species in the catalysts,which lead to tunable OER performance.When the feed ratio of Mo-dopant is 5%,the Mo-modified FeNiV oxide shows the best OER performance in terms of low overpotential(237 mV at the current density of 10 mA cm^(−2)),Tafel slope(38 mV per decade),and high mass activity,which exceeds its counterparts and most reported OER catalysts.Furthermore,by assembling the catalyst with a carbon fiber cloth,the fabricated water-splitting device exhibits excellent activity and longterm durability in alkaline electrolyte compared with commercial catalysts equipped device.This work not only provides a series of Mo-modified FeNiV-based oxides as high-performance OER catalysts but also offers a new pathway to tune the charge states of OER active centers.

关键词： Electrocatalysts Transition metal-based materials Oxygen evolution reaction High-valence metals Water splitting

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Carbon‑Based Electrodes for Advanced Zinc‑Air Batteries:Oxygen‑Catalytic Site Regulation and Nanostructure Design

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Electrochemical Energy Reviews 2023年第1期6卷 532-572页

作者： Wenjie Shao Rui Yan Mi Zhou Lang Ma Christina Roth Tian Ma Sujiao Cao chong cheng Bo Yin Shuang Li College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065SichuanChina College of Biomass Science and Engineering Sichuan UniversityChengdu 610065SichuanChina Department of Ultrasound West China HospitalSichuan UniversityChengdu 610041SichuanChina Electrochemical Process Engineering Engineering SciencesUniversity of BayreuthUniversitätsstr.3095447 BayreuthGermany Med-X Center for Materials Sichuan UniversityChengdu 610065SichuanChina Functional Materials Department of ChemistryTechnische Universität BerlinHardenbergstraße 4010623 BerlinGermany

Zn-air batteries are highly attractive for direct chemical-to-electrical energy conversion and for solving the energy crisis and environmental problems.Designing efficient oxygen electrodes has been considered one of the most critical steps in the development of advanced Zn-air batteries because of the sluggish kinetics of the oxygen reduction reaction and the oxygen evolution reaction.In recent years,nanostructured carbon-based electrodes with large surface areas,efficient oxygen-catalytic centers,and hierarchically porous matrices have provided significant opportunities to optimize the performance of the oxygen electrodes in both primary and rechargeable Zn-air batteries.In this review,we provide a comprehensive summary of the reported nanostructured carbon-based electrodes for advanced Zn-air batteries in terms of tailoring the oxygen-catalytic sites and designing carbon supports.The versatile synthetic strategies,characterization methods,and in-depth understanding of the relationships between the oxygen-catalytic sites/nanostructures and the oxygen electrode performance are systematically summarized.Furthermore,we also briefly outline recent progress in engineering flexible and high-power Zn-air batteries.Ultimately,a thorough discussion of current primary challenges and future perspectives on the rational design of nanostructured carbon-based oxygen electrodes is given,thus providing inspiration for the future prosperity of fast-kinetic and efficient Zn-air batteries in a broad range of energy fields.

关键词： Zn-air batteries Carbon nanostructures Electrocatalysts Oxygen-catalytic catalysts ORR OER

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Nanostructures and catalytic atoms engineering of tellurium-based materials and their roles in electrochemical energy conversion

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SmartMat 2023年第1期4卷 72-105页

作者： Tiantian Li Yuting Deng Xiao Rong Chao He Mi Zhou Yuanjiao Tang Hongju Zhou chong cheng Changsheng Zhao State Key Laboratory of Polymer Materials Engineering College of Polymer Science and EngineeringSichuan UniversityChengduChina Department of Nephrology Department of UltrasoundWest China HospitalSichuan UniversityChengduChina Department of Physics Chemistry and PharmacyDanish Institute for Advanced Study(DIAS)University of Southern DenmarkOdenseDenmark Med-X Center for Materials Sichuan UniversityChengduChina College of Chemical Engineering Sichuan UniversityChengduChina

With the dramatic developments of renewable and environmental-friendly electrochemical energy conversion systems,there is an urgent need to fabricate durable and efficient electrocatalysts to address the limitation of high overpotentials exceeding thermodynamic requirements to facilitate practical applications.Recently,tellurium-based nanomaterials(Te NMs)with unique chemical,electronic,and topological properties,including Te-derived nanostructures and transition metal tellurides(TMTs),have emerged as one of the most promising electrocatalytic materials.In the absence of comprehensive and guiding reviews,this review comprehensively summarizes the main advances in designing emerging Te NMs for electrocatalysis.First,the engineering strategies and principles of Te NMs to enhance their electrocatalytic activity and stability from the nanostructures to the catalytic atoms are discussed in detail,especially on the chemical/physical/multiplex templating strategies,heteroatom doping,vacancy/defect engineering,phase engineering,and the corresponding mechanisms and structure-performance correlations.Then,typical applications of Te NMs in electrocatalysis are also discussed in detail.Finally,the existing key issues and main challenges of Te NMs for electrocatalysis are highlighted,and the development trend of Te NMs as electrocatalysts is expounded.This review provides new concepts to guide future directions for developing Te NMs-based electrocatalysts,thereby promoting their future wide applications in electrochemical energy systems.

关键词： electrocatalytic applications energy conversion nanocatalysts and nanostructures Te-based materials transition metal tellurides

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Ti-MOF-based biosafety materials for efficient and long-life disinfection via synergistic photodynamic and photothermal effects

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Biosafety and Health 2022年第2期4卷 135-146页

作者： Lan Xie Heng Yang Xizheng Wu Liyun Wang Bihui Zhu Yuanjiao Tang Mingru Bai Ling Li chong cheng Tian Ma College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China Department of Ultrasound National Clinical Research Center for GeriatricsWest China HospitalSichuan UniversityChengdu 610041China Department of Ultrasound Affiliated Hospital of North Sichuan Medical CollegeNanchong 637000China

Pathogenic bacterial infection is severely threatening public health globally.The multi-modal antibacterial nanoplatforms could significantly improve the antibacterial efficiency.Here,we report a metal(Ti)-organic framework(MOF)derived nanocarbon(C-Ti-MOF)as a biosafety material for synergistic sterilization of pathogenic bacteria via efficient photodynamic catalysis and robust photothermal effects.The C-Ti-MOF consists of abundant TiO_(2) nanodots embedded in graphitic carbon frameworks.Under visible light irradiation,TiO_(2) nanodots can catalyze H_(2)O_(2) and O_(2) to produce superoxide anion(•O_(2)^(–))and singlet oxygen(1O2),respectively.Meanwhile,under near-infrared irradiation(NIR),C-Ti-MOF can generate massive heat to destroy bacterial membranes.Systematic antibacterial experiments reveal that the C-Ti-MOF nanoagents have a long-lasting and nearly 100%bactericidal ratio at an extremely low dose(0.16 mg/mL),which is much better than the state-of-the-art TiO_(2)(Commercial TiO_(2)(P25),0.64 mg/mL).Furthermore,the C-Ti-MOF can be electrospun into an antibacterial nanofiber membrane via mixing with polymeric matrix for treating bacteriacontaminated wastewater,and the membranes possess integrated antibacterial activity and excellent biocompatibility.Our study demonstrates a promising Ti-MOF-based biosafety material for efficient and long-life disinfection,which may stimulate new research in MOF-related biological applications in various disciplines ranging from water decontaminations to nanotherapeutics.

关键词： Metal-organic frameworks Biosafety materials Photodynamic and photothermal effects Reactive oxygen species Bacterial disinfection

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Structures,properties,and challenges of emerging 2D materials in bioelectronics and biosensors

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InfoMat 2022年第5期4卷 102-138页

作者： Fan Chen Qing Tang Tian Ma Bihui Zhu Liyun Wang Chao He Xianglin Luo Sujiao Cao Lang Ma chong cheng College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringDepartment of UltrasoundWest China HospitalMed-X Center for MaterialsSichuan UniversityChengduChina National Clinical Research Center for Geriatrics West China HospitalSichuan UniversityChengduChina Department of Chemistry and Biochemistry Freie Universität BerlinBerlinGermany

Bioelectronics are powerful tools for monitoring and stimulating biological and biochemical processes,with applications ranging from neural interface simulation to biosensing.The increasing demand for bioelectronics has greatly promoted the development of new nanomaterials as detection platforms.Recently,owing to their ultrathin structures and excellent physicochemical properties,emerging two-dimensional(2D)materials have become one of the most researched areas in the fields of bioelectronics and biosensors.In this timely review,the physicochemical structures of the most representative emerging 2D materials and the design of their nanostructures for engineering highperformance bioelectronic and biosensing devices are presented.We focus on the structural optimization of emerging 2D material-based composites to achieve better regulation for enhancing the performance of bioelectronics.Subsequently,the recent developments of emerging 2D materials in bioelectronics,such as neural interface simulation,biomolecular/biomarker detection,and skin sensors are discussed thoroughly.Finally,we provide conclusive views on the current challenges and future perspectives on utilizing emerging 2D materials and their composites for bioelectronics and biosensors.This review will offer important guidance in designing and applying emerging 2D materials in bioelectronics,thus further promoting their prospects in a wide biomedical field.

关键词： bioelectronics biosensors emerging 2D materials nanostructures and properties neural interfaces simulation

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