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Large specific surface area S-doped Fe–N–C electrocatalysts derived from Metal–Organic frameworks for oxygen reduction reaction

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Progress in Natural Science:Materials International 2020年第6期30卷 896-904页

作者： Xiaohui Yan Xiaolin Li Cehuang fu Chen Lin Huanming Hu Shuiyun Shen Guanghua Wei junliang Zhang Institute of fuel Cells School of Mechanical Engineering Shanghai Jiao Tong University Central Research Institute Shanghai Electric Group SJTU-Paris Tech Elite Institute of Technology Shanghai Jiao Tong University MOE Key Laboratory of Power Machinery and Engineering Shanghai Jiao Tong University

It is highly desired but challenging to develop platinum group metal-free electrocatalysts for oxygen reduction reaction(ORR), which can promote the commercialization of fuel cell technology. To achieve this target, we report a one-step doping method to prepare S-doped Fe–N–C catalysts using zeolite imidazole framework(ZIF-8)and iron(III) thiocyanate(Fe(SCN)3) as precursor. Different from conventional doping approach, i.e. physical mixing, Fe(SCN)3is in-situ added during ZIF-8 formation which would encapsulate Fe(SCN)3molecules inside ZIF-8 to avoid structure destruction and create potential replacement of Zn ions by Fe ions to form uniform Fe–N4 complexes. As a result, the prepared S-doped Fe–N–C catalysts own large specific surface areas with a maximum value of 1326 m2g-1and a dual-scale porous structure that benefits mass transport. Significantly, the composition-optimized catalyst exhibits superior ORR activity in both 0.1 M HCl O4electrolyte and 0.1 M KOH electrolyte, in which the half-wave potential reaches 0.81 V and 0.92 V(vs. RHE), respectively. Remarkable stability is also attained, which loses 2 m V only after 10000 potential cycles in O2-saturated 0.1 M HCl O4and remains almost constant in O2-saturated 0.1 M KOH, surpassing commercial Pt/C catalyst in both acidic and alkaline medium.

关键词： fuel cells Oxygen reduction reaction Non-precious metal catalyst Co-doping Acidic and alkaline medium

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Highly efficient Cu/anatase TiO2 {001}-nanosheets catalysts for methanol synthesis from CO2

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Journal of Energy Chemistry 2018年第2期27卷 381-388页

作者： Yunfeng Bao Chunlei Huang Limin Chen Yu dong Zhang Long Liang Jinjun Wen Mingli fu junliang Wu Daiqi Ye National Engineering Laboratory for VOCs Pollution Control Technology and Equipment Guangzhou Higher Education Mega Centre South China University of Technology Guangzhou 510006 Guangdong China Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control School of Environment and Energy Guangzhou Higher Education Mega Centre South China University of Technology Guangzhou 510006 Guangdong China Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal. Guangzhou Higher Education Mega Centre South China University of Technology Guangzhou 510006 Guangdong China

Anatase TiO2 nanosheets（-ns-） with dominant exposed {001} facets were used as support to load copper,and the synthesized Cu/TiO2-ns catalysts were evaluated for CO2 hydrogenation to methanol. Under the reaction conditions, P = 3.0 MPa, T = 260 ℃, V（N2）：V（H2）：V（CO2） = 8：69：23 and gas hourly space velocity（GHSV） = 3600 mL g-1h-1, the methanol yield reached an appealing high value, 5.6%. Copper-loading amount, calcination temperature and reduction atmosphere have been investigated in this work, which significantly influence the particle sizes of copper and/or the defect concentration in TiO2, then leading to different catalytic performance. Characterizations of XRD, EPR, CO2-TPD and FTIR demonstrate that higher specific surface area of Cu is good for the hydrogenation of CO2 and adequate amount of Ti3＋ plays important roles in CO2 activation. Both of them facilitate high turnover frequency（TOF） of methanol formation.

关键词： TiO2 nanoshees Ti3+ Copper Carbon dioxide hydrogenation Methanol synthesis

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Macroporous Ni foam-supported Co_3O_4 nanobrush and nanomace hybrid arrays for high-efficiency CO oxidation

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Journal of Environmental Sciences 2019年第1期31卷 136-144页

作者： Shengpeng Mo Hui He Quanming Ren Shuangde Li Weixia Zhang Mingli fu Limin Chen junliang Wu Yunfa Chen Daiqi Ye School of Environment and Energy South China University of Technology State Key Laboratory of Multi-phase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT) Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal South China University of Technology Center for Excellence in Urban Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences

Herein, we reported the synthesis of well-defined Co_3O_4 nanoarrays(NAs) supported on a monolithic three-dimensional macroporous nickel(Ni) foam substrate for use in highefficiency CO oxidation. The monolithic Co_3O_4 NAs catalysts were obtained through a generic hydrothermal synthesis route with subsequent calcination. By controlling the reaction time,solvent polarity and deposition agent, these Co_3O_4 NAs catalysts exhibited various novel morphologies(single or hybrid arrays), whose physicochemical properties were further characterized by using several analytical techniques. Based on the catalytic and characterization analyses, it was found that the Co_3O_4 NAs-6 catalyst with nanobrush and nanomace arrays displayed enhanced catalytic activity for CO oxidation, achieving an efficient 100% CO oxidation conversion at a gas hourly space velocity(GHSV) 10,000 hr^(-1) and 150°C with longterm stability. Compared with the other Co_3O_4 NAs catalysts, it had the highest abundance of surface-adsorbed oxygen species, excellent low-temperature reducibility and was rich in surface-active sites(Co^(3+)/Co^(2+)= 1.26).

关键词： CO oxidation Nanomace Co3O4 Hybrid arrays Macroporous Ni foam

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Heparinized PGA host-guest hydrogel loaded with paracrine products from electrically stimulated adipose-derived mesenchymal stem cells for enhanced wound repair

再生工程(英文)

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再生工程(英文) 2023年第3期4卷 225-237页

作者： Mengyao Li junliang Li Xueru Xiong Yushi Wang Yong-Guang Jia Xuetao Shi Xiaoling fu School of Materials Science and Engineering South China University of TechnologyGuangzhou 510641China School of Biomedical Sciences and Engineering South China University of TechnologyGuangzhou International CampusGuangzhou 511442China National Engineering Research Center for Tissue Restoration and Reconstruction and Innovation Center for Tissue Restoration and Reconstruction Guangzhou 510006China Key Laboratory of Biomedical Engineering of Guangdong Province South China University of TechnologyGuangzhou 510006China

The microenvironment of the wound bed is essential in the regulation of wound *** this regard,strategies that provide a repairing favorable microenvironment may effectively improve healing ***,we attempted to use electrical stimulation(ES)to boost the paracrine function of adipose-derived stem cells from rats(rASCs).By examining the concentrations of two important growth factors,VEGF and PDGF-AA,in the cell culture supernatant,we found that ES,especially 5𝜇A ES,stimulated rASCs to produce more paracrine factors(5𝜇A-PFs).further studies showed that ES may modulate the paracrine properties of rASCs by upregulating the levels of TRPV2 and TRPV3,thereby inducing intracellular Ca^(2+) *** deliver the PFs to the wound to effectively improve the wound microenvironment,we prepared a heparinized PGA host-guest hydrogel(PGA-Hp hydrogel).Moreover,PGA-Hp hydrogel loaded with 5𝜇A-PFs effectively accelerated the repair process of the full-thickness wound model in *** findings revealed the effects of ES on the paracrine properties of rASCs and highlighted the potential application of heparinized PGA host-guest hydrogels loaded with PFs derived from electrically stimulated rASCs in wound repair.

关键词： Wound repair Electrical stimulation Paracrine factors Heparinized PGA host-guest hydrogel

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Large area van der Waals epitaxy of II-VI CdSe thin films for flexible optoelectronics and full-color imaging

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Nano Research 2022年第1期15卷 368-376页

作者： Wenwu Pan junliang Liu Zekai Zhang Renjie Gu Alexandra Suvorova Sarah Gain Han Wang Ziyuan Li Lan fu Lorenzo Faraone Wen Lei Department of Electrical Electronic and Computer EngineeringThe University of Western Australia35 Stirling HighwayCrawley 6009Australia Centre for Microscopy Characterisation and AnalysisThe University of Western Australia35 Stirling HighwayPerth 6009Australia Department of Electronic Materials Engineering Research School of PhysicsThe Australian National UniversityCanberra ACT 2601Australia

The demand for future semiconductor devices with enhanced performance and lower cost has driven the development of epitaxial growth of high quality,free-standing semiconductor thin film materials without the requirement of lattice matching to the substrate,as well as their transfer to other substrates and associated device processing *** work presents a study on the van der Waals epitaxy based molecular beam epitaxy of CdSe thin films on two-dimensional layered mica substrates,as well as related etch-free layer transfer technology of large area,free-standing layers and their application in flexible photodetectors for full-color *** photoconductor detectors based on these flexible CdSe thin films demonstrate excellent device performance at room temperature in terms of responsivity(0.2 A·W^(-1))and detectivity(1.5×10^(12)Jones),leading to excellent full-color imaging quality in the visible spectral *** etch-free and damage-free layer transfer method has been developed for transferring these CdSe thin films from mica to other substrate for further device processing and *** results demonstrate the feasibility of van der Waals epitaxy method for growing high quality,large area,and free-standing epitaxial layers without the requirement for lattice matching to substrate for applications in low-cost flexible and/or monolithic integrated optoelectronic devices.

关键词： CdSe flexible devices van der Waals epitaxy molecular beam epitaxy layer lift-off

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Physiological and genome-wide gene expression analyses of cold-induced leaf rolling at the seedling stage in rice(Oryza sativa L.)

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The Crop Journal 2019年第4期7卷 431-443页

作者： Jingfang Dong junliang Zhao Shaohong Zhang Tifeng Yang Qing Liu Xingxue Mao Hua fu Wu Yang Bin Liu Rice Research Institute Guangdong Academy of Agricultural Sciences/Guangdong Provincial Key Laboratory of New Technology in Rice Breeding

Leaf rolling and discoloration are two chilling-injury symptoms that are widely used as indicators for the evaluation of cold tolerance at the seedling stage in rice. However, the difference in cold-response mechanisms underlying these two traits remains unknown. In the present study, a cold-tolerant rice cultivar, Lijiangxintuanheigu, and a cold-sensitive cultivar, Sanhuangzhan-2, were subjected to low-temperature treatments and physiolog-ical and genome-wide gene expression analyses were conducted. Leaf rolling occurred at temperatures lower than 11℃, whereas discoloration appeared at moderately low temperatures such as 13℃. Chlorophyll contents in both cultivars were significantly decreased at 13℃, but not altered at 11℃. In contrast, the relative water content and relative electrolyte leakage of both cultivars decreased significantly at 11℃, but did not change at 13℃. Expression of genes associated with calcium signaling and abscisic acid (ABA) degradation was significantly altered at 11℃ in comparison with 25℃ and 13℃. Numerous genes in the DREB, MYB, bZIP, NAC, Zinc finger, bHLH, and WRKY gene families were differentially expressed. Many aquaporin genes and the key genes in trehalose and starch synthesis were down regulated at 11℃ in comparison with 25℃ and 13℃. These results suggest that the two chilling injury symptoms are temperature-specific and are controlled by different mechanisms. Cold-induced leaf rolling is associated with calcium and ABA signaling pathways and is regulated by multiple transcriptional regulators. The suppression of aquaporin genes and reduced accumulation of soluble sugars under cold stress results in a reduction in cellular water potential and consequently leaf rolling.

关键词： Rice(Oryza sativa L.) Cold-induced leaf yellowing Cold-induced leaf rolling Physiological analysis Genome-wide expression profiling

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First-principles study of catalytic activity of W-doped cobalt phosphide toward the hydrogen evolution reaction

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Chinese Journal of Catalysis 2020年第11期41卷 1698-1705页

作者： Cehuang fu Xiaohui Yan Lijun Yang Shuiyun Shen Liuxuan Luo Guanghua Wei junliang Zhang Institute of fuel Cells Key Laboratory for Power and Machinery Engineering of MOESchool of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China MOE Key Laboratory of Mesoscopic Chemistry Jiangsu Provincial Labfor NanotechnologySchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023JiangsuChina SJTU-Paris Tech Elite Institute of Technology Shanghai Jiao Tong UniversityShanghai 200240China

In this study,we investigated the hydrogen evolution reaction(HER)on the(101)facet of pristine and W-doped CoP using the density functional *** types of Co atoms are identified on the catalyst surface:the Co atoms that present the higher d band center are marked as valid sites,whereas the others are marked as invalid sites owing to their weaker H adsorption *** is further revealed that W-doping can decrease the d band center of the surface Co atoms,which is beneficial for the HER;however the exposure to W weakens the desorption of *** address the strong adsorption effect of W,the doping sites and dopant content are analyzed,and the results indicate that 8.4 wt%W doping at the invalid surface Co sites is preferred;moreover,the optimal W content increases to 16.8 wt%when W is inserted into the *** effect of W doping is weakened when the doping site is far away from the surface.

关键词： Hydrogen Evolution Reaction Density functional theory CoP Doping

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Bioactive glass promotes the barrier functional behaviors of keratinocytes and improves the Re-epithelialization in wound healing in diabetic rats

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Bioactive Materials 2021年第10期6卷 3496-3506页

作者： Fengling Tang junliang Li Weihan Xie Yunfei Mo Lu Ouyang fujian Zhao Xiaoling fu Xiaofeng Chen Department of Biomedical Engineering School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510641PR China National Engineering Research Center for Tissue Restoration and Reconstruction Guangzhou 510006PR China Key Laboratory of Biomedical Engineering of Guangdong Province and Innovation Center for Tissue Restoration and ReconstructionSouth China University of TechnologyGuangzhou 510006PR China Stomatological Hospital Southern Medical UniversityGuangzhou 510280PR China

Upon skin injury,re-epithelialization must be triggered promptly to restore the integrity and barrier function of the ***,this process is often delayed or interrupted in chronic wounds like diabetic foot *** that BG particles can activate multiple genes in various cells,herein,we hypothesized that bioactive glass(BG)might be able to modulate the barrier functional behaviors of *** measuring the transepithelial electrical resistance(TEER)and the paracellular tracer flux,we found the 58S-BG extracts substantially enhanced the barrier function of keratinocyte *** BG extracts might exert such effects by promoting the keratinocyte differentiation and the formation of tight junctions,as evidenced by the increased expression of critical differentiation markers(K10 and involucrin)and TJ protein claudin-1,as well as the altered subcellular location of four major TJ proteins(claudin-1,occludin,JAM-A,and ZO-1).Besides,the cell scratch assay showed that BG extracts induced the collective migration of keratinocytes,though they did not accelerate the migration rate compared to the *** in vivo study using a diabetic rat wound model demonstrated that the BG extracts accelerated the process of re-epithelialization,stimulated keratinocyte differentiation,and promoted the formation of tight junctions in the newly regenerated *** findings revealed the crucial effects of BGs on keratinocytes and highlighted its potential application for chronic wound healing by restoring the barrier function of the wounded skin effectively.

关键词： Bioactive glass Keratinocyte Barrier function Diabetic wound healing

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Electrodeposited PtNi nanoparticles towards oxygen reduction reaction:A study on nucleation and growth mechanism

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Chinese Journal of Catalysis 2021年第11期42卷 2068-2077页

作者： Lutian Zhao Yangge Guo Cehuang fu Liuxuan Luo Guanghua Wei Shuiyun Shen junliang Zhang Institute of fuel Cells Key Laboratory for Power Machinery and Engineering of MOESchool of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China SJTU-ParisTech Elite Institute of Technology Shanghai Jiao Tong UniversityShanghai 200240China

In this work,highly monodispersed Pt-Ni alloy nanoparticles were directly deposited on carbon substrate through a facile electrodeposition strategy in the solvent system of N,N-dimethylformamide(DMF).A series of carbon supported Pt-Ni alloy electrocatalysts were synthesized under different applied electrode *** all as-obtained samples,the Pt-Ni/C electrocatalyst deposited at-1.73 V exhibits the optimal specific activity up to 1.850 mA cm^(-2)at 0.9 V ***,which is 6.85 times higher than that of the commercial Pt/*** physiochemical characterizations and computational evaluations via density functional theory were conducted to unveil the nucleation and growth mechanism of PtNi alloy *** to the aqueous solution,DMF solvent molecule must not be neglected in avoiding particle agglomeration and synthesis of monodispersed *** the alloy co-deposition process,Ni sites produced through the reduction of Ni(Ⅱ)precursor not only facilitates Pt-Ni alloy crystal nucleation but also in favor of further Pt reduction on the Ni-inserted Pt *** for the deposition potential,it adjusts the final particle *** work provides a hopeful extended Pt-based catalyst layer production strategy for proton exchange membrane fuel cells and a new idea for the nucleation and growth mechanism exploration for electrodeposited Pt alloy.

关键词： Electrodeposition PtNi alloy nanoparticles Oxygen reduction reaction Nucleation and growth mechanism Density functional theory

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functional zoning and space management of Three-River-Source National Park

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Journal of Geographical Sciences 2019年第12期29卷 2069-2084页

作者： fu Mengdi TIAN junliang REN Yueheng LI Junsheng LIU Weiwei ZHU Yanpeng State Key Laboratory of Environmental Criteria and Risk Assessment State Environmental Protection Key Laboratory of Regional Eco-process and Function AssessmentChinese Research Academy of Environmental SciencesBeijing 100012China Three-River-Source National Park Administration Xining 810007China

functional zoning is a key step for the integrated planning and scientific management of a national *** the Three-River-Source National Park(TNP)as the study area,this paper establishes an evaluation system including 13 evaluation indexes which are classified into four categories,namely:ecosystem services;potential distribution of key species habitats;ecological sensitivity;and ecological resilience through the comprehensive analysis on the regional eco-environmental features in the study *** results of the comprehensive analysis,combined with the functions and requirements of management of national parks,indicate that TNP is divided into the first-level zone(the core conservation area,the ecological restoration area and the traditional utilization area)with definite targets of space management and the second-level zone with implementation of control *** method of functional zoning lays a solid foundation for the scientific planning of TNP;moreover,our study provides new insights into other national parks’functional zoning.

关键词： national parks Three-River-Source National Park(TNP) functional zoning index system space management

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