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Mechanistic insight into the synergy between nickel single atoms and nanoparticles on N-doped carbon for electroreduction of CO2

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Journal of Energy Chemistry 2025年第1期100卷 327-336页

作者： Mingdong Sun Wenwen Guan Cailing Chen chao Wu Xiaoling Liu Biao Meng Tao Chen Yu Han Jun Wang Shibo Xi Yu Zhou State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Advanced Membranes and Porous Materials Center Physical Sciences and Engineering Division King Abdullah University of Science and Technology Institute of Sustainability for Chemicals Energy and Environment A*STAR (Agency for Science Technology and Research) College of Materials Science and Engineering Sichuan University

The synergy of single atoms （SAs） and nanoparticles （NPs） has demonstrated great potential in promoting the electrocatalytic carbon dioxide reduction reaction （CO2RR）;however,the rationalization of the SAs/NPs proportion remains one challenge for the catalyst ***,a Ni2+-loaded porous poly（ionic liquids）(PIL) precursor synthesized through the free radical self-polymerization of the ionic liquid monomer,1-allyl-3-vinylimidazolium chloride,was pyrolyzed to prepare the Ni,N co-doped carbon materials,in which the proportion of Ni SAs and NPs could be facilely modulated by controlling the annealing *** catalyst Ni-NC-1000 with a moderate proportion of Ni SAs and NPs exhibited high efficiency in the electrocatalytic conversion of CO2into *** Ni K-edge X-ray absorption near-edge structure （XANES） spectra and theoretical calculations were conducted to gain insight into the synergy of Ni SAs and *** charge transfer from Ni NPs to the surrounding carbon layer and then to the Ni SAs resulted in the electron-enriched Ni SAs active *** the electroreduction of CO2,the coexistence of Ni SAs and NPs strengthened the CO2activation and the affinity towards the key intermediate of*COOH,lowering the free energy for the potential-determining*CO2→*COOH step,and therefore promoted the catalysis efficiency.

关键词： Activation energy

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Constructing quasi-2D perovskite to collect hot carriers to reduce open-circuit voltage loss for efficient inverted perovskite solar cells

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Science China Chemistry 2025年

作者： Lei Gu Xing Li chao Wu Yang Feng Chunming Yang Lin Song Frontiers Science Center for Flexible Electronics Institute of Flexible Electronics Northwestern Polytechnical University Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences

Inverted perovskite solar cells （PSCs） have received great attention owing to the high certificated power conversion efficiency（PCE） reaching 26.7%. However, interfacial charge recombination is far superior to perovskite bulk charge recombination due to the use of fullerenes and their derivatives in inverted perovskite solar cells, which induces devastating open circuit voltage（VOC） losses. For this reason the present work attempts to use 4-chloropiperidine hydrochloride for the upper surface modification of perovskite to construct a quasi-two-dimensional （2D） structure with suitable 2D layer widths （n=2, 3 dominant）,which has a smaller electron carrier transport barrier without sacrificing short-circuit current （JSC） in the device. This strategy effectively passivates the interfacial defect states while promoting energy level alignment to achieve carrier dissociation and equilibrium transport at the interface, which in turn resulted in improved fill factor （FF）. In addition, additional energy levels are provided by 2D perovskites to collect hot carriers, resulting in improved device open circuit voltage （VOC）. As a result, the device PCE increases from 22.37%to 24.11%after the 4CPD treatment. In addition, the 4CPD-treated PSCs maintain 90%of the initial PCE after storage in an N2atmosphere at 50°C for 1,080 h, whereas the control devices show a 15%PCE loss under the same aging conditions. This work provides new opportunities to suppress interfacial charge recombination in inverted devices.

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Unveiling an ancient whole-genome duplication event in Stentor,the model unicellular eukaryotes

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Science China Life Sciences 2025年

作者： Weibo Zheng chao Li Zhaorui Zhou Xiao Chen Michael Lynch Ying Yan School of Life Sciences Ludong University Key Laboratory of Evolution & Marine Biodiversity (Ministry of Education) and Institute of Evolution & Marine Biodiversity Ocean University of China Biodesign Center for Mechanisms of Evolution Arizona State University Marine College Shandong University

Whole-genome duplication(WGD) events are widespread across eukaryotes and have played a significant role in moulding the genetic architectures of diverse organisms. In the present study, the newly sequenced genome of a giant ciliated protist, Stentor roeselii, provides an opportunity for the analysis of the collinearity and retention of reciprocal best-hit genes between two Stentor species. As a main result, we have unveiled a previously undetected ancient WGD event shaping the genome of its congener, Stentor coeruleus, a model protist used in cytological and evolutionary studies. Genomes of two congeners, S. coeruleus and S. roeselii, are compared and analyzed, revealing that:(i)the former exhibits a much higher retention rate of colinear-gene pairs(28%) than does S. roeselii, and in S. coeruleus, 75% of genes that have a RBH hit in S. roeselii, have paralogs with high amino-acid identity, consistent with a WGD event in the lineage leading to S. coeruleus;(ii) the S. roeselii genome possesses extremely short intergenic regions, implying that the lengths of intergenic regions are under strong selection;(iii) the unique characteristics of introns may have been shaped in the common ancestor of heterotrichs;(iv) gene families that play a role in activities of multiple protein kinases and voltage-gated ion channels expanded rapidly in the ancestor of both taxa, possibly relating to the remarkable regenerative ability in Stentor. This study offers new insights into the evolutionary dynamics of ciliate genomes,with implications for understanding of the processes underlying the evolution of genomic complexity.

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Expression of Human Vascular Endothelial Growth Factor (VEGF_(165)) in Pichia pastoris and Its Biological Activity

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Biomedical and Environmental Sciences 2001年第4期14卷 302-311页

作者： MALI zhangzhi－QING 等 InstituteofMolecularImmunology theFirstMilitaryMedicalUniversityGuangzhou510515China StateKeyLaboratoryofMolecularVirologyandGeneticEnginering Beijing100052China

Objective To express human vascular endothelial growth factor (hVEGF-{165}) cDNA in %Pichia pastroris, %purify the expressed product and detect the biological activity of it. Methods By inserting hVEGF-{165} cDNA coding 165 amino acid residues into %Pichia pastoris% expression vector pPIC9K containing AOX1 promoter and the sequences of α secreting signal peptides, a recombinant expression plasmid pPIC9K/hVEGF-{165} was constructed and transformed to yeast host strain KM71, then multiple_copy insert transformants were screened out and cultured in flasks, and hVEGF-{165} was expressed under the induction of 1% methanol. Results SDS_PAGE showed that after being induced with 1% methanol for 4d, the expressed product existed in supernatant in the form of soluble molecule and contained 60% of total protein expressed. Western blot showed good antigenicity and specificity of expressed product. After being purified by Heparin_Sepharose CL6B affinity chromatography, the purity of expressed product reached above 90%. Biological assays proved that the expressed product could stimulate the proliferation of HUVEC. Conclusion hVEGF-{165} was successfully expressed. The study opened up a wide prospect for the application of VEGF-{165} in the prevention and treatment of ischemic heart disease and other tissue ischemic diseases such as secondary arterial occlusion in limbs.

关键词： Endothelial Growth Factor Biological Activity expressed product endothelial growth factor prevention and treatment affinity chromatography ischemic heart disease biological activity amino acid residues expression vector Pichia pastoris form of up a

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Expression of Human Vascular Endothelial Growth Factor Receptor Flt-1 Extracellular Domain 1-3 Loop cDNA in Pichia pastoris, Purification of the Expressed Product and Detection of Its Biological Activity

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Biomedical and Environmental Sciences 2001年第4期14卷 292-301页

作者： MALI zhangzhi－QING 等 InstituteofMolecularImmunology ThefirstMilitaryMedicalUniversityGuangzhou510515China StateKeyLaboratoryofMolecularVirologyandGeneticEngineering Beijing100052China

Objective To express human vascular endothelial growth factor receptor Flt-1 extracellular domain 1-3 loop cDNA in Pichia. pastroris, and to purify the expressed product and detect its biological activity. Methods By inserting human Flt-1 (1-3 loop) cDNA coding 316 amino acid residues into Pichia pastoris expression vector pPIC9K containing AOX1 promoter and the sequences of α secreting signal peptides, a recombinant expression plasmid pPIC9K/Flt-1 (1-3) was constructed and transformed to yeast host strain GS115, then His + Mut s phenotype transformant was screened out and cultured in flasks, and Flt-1 (1-3) was expressed under the induction of 1% methanol. Results SDS-PAGE showed that after being induced with 1% methanol for 4d, the expressed product existed in supernatant in the form of soluble molecule and contained 60% of total protein expressed. Western blot showed good antigenicity and specificity of expressed product. After being purified by CM-Sepharose FF and Sephacryl S-100 chromatography, the purity of the expressed product reached above 90%. Biological assay proved that the expressed product could bind to hVEGF 165 and inhibit the proliferation of HUVEC stimulated by hVEGF 165. Conclusion Human vascular endothelial growth factor receptor Flt-1 extracellular domain 1-3 loop was successfully expressed. The study lays a foundation for further application of the expressed product in the treatment of vasoformation related diseases, such as tumor and diabetic retinopathy.

关键词： Endothelial Growth Factor Pichia pastoris expressed product growth factor receptor diabetic retinopathy biological activity amino acid residues expression vector product in form of

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The 2D Alternative Binary L—J System：Solid—Liquid Phase Diagram

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Communications in Theoretical Physics 2002年第5期37卷 601-606页

作者： zhangzhi CHENLi－Rong DepartmentofPhysics AnhuiNormalUniversityWuhu241000AnhuiProvinceChina

The Lennard-Jones potential is introduced into the Collins model and is generalized to the two-dimensionalalternative binary system. The Gibbs free energy of the binary system is calculated. According to the thermodynamicconditions of solid-liquid equilibrium, the "cigar-type" phase diagram and the phase diagram with a minimum areobtained. The results are quite analogous to the behavior of three-dimensional substances.

关键词：热力学固态-液态相图 2DBernal模型 L-J势

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Synthesis of Poly[(3-octanoylpyrrole-2,5-diyl)-p-nitrobenzylidene] and Its Third-order Nonlinear Optical Property

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Chemical Research in Chinese Universities 2005年第2期21卷 220-223页

作者： zhangzhi-gang WUHong-cai YIWen-hui InstituteofPhotoelectricTechnologyandSolarEnergy SchoolofElectronicandInformationEngineeringXi＇anJiaotongUniversityXi＇an710049P.R.China InstituteofPhotoelectricTechnologyandSolarEnergy SchoolofElectronicandInformationEngineeringXi＇anJiaotongUniversityXi＇an710049P.R.China

A novel soluble π-conjugated polymer, poly[(3-octanoylpyrrole-2,5-diyl)-p-nitrobenzylidene] (POPNBE), was synthesized by a five-step reaction. As a result of introducing a long acyl to pyrrole at 3-position, the polymer can be easily solved in polar solvents and be processed into films. The chemical structures of the intermediates and POPNBE were characterized by FTIR, 1H NMR, and UV-Vis-NIR spectrometries. The absorption band in the range of 400-600 nm in the UV-Vis-NIR spectrum is due to the π-π * band gap transition. The optical band gap of POPNBE obtained from the optical absorption is about 1.72 eV. The resonant third-order nonlinear optical property of POPNBE at 532 nm was studied by using the degenerate four-wave mixing(DFWM) technique. The resonant third-order nonlinear optical susceptibility of POPNBE is about 3.42×10 -8 esu.

关键词： Poly[(3-octanoylpyrrole-2,5-diyl)-p-nitrobenzylidene] Small optical band gap Degenerate four wave-mixing technique Third-order nonlinear optical property

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Layered and isotropic acoustic cloak design based on conformal transformation acoustics

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Science China(Physics,Mechanics & Astronomy) 2011年第4期54卷 593-597页

作者： REN ChunYu XIANG ZhiHai CEN zhangzhi Key Laboratory of Applied Mechanics Tsinghua University Chinese Ministry of Education Beijing 100084 China Department of Naval Architecture and Ocean Engineering Naval University of Engineering Wuhan 430033 China

The acoustic cloak can manipulate sound waves in surprising ways and enable us to guide the trajectories of waves at *** contrast to the existing approaches for designing such devices that need exotic material parameters,here we demonstrate how to design a layered and isotropic acoustic cloak based on conformal transformation acoustics.A petal-shaped layered acoustic cloak is designed from the reduction of material parameters of an approximate rectangular *** resultant material parameters span a narrow range,thus strongly facilitating the *** invisibility performance of the cloak for different shapes of acoustic wavefront is verified using a full-wave finite-element analysis.

关键词： Conformal transformation acoustics cloak isotropic material layered

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Annealing behavior of ultrathin Mo layer located at interface or on surface of Ti-Si system

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Nuclear Science and Techniques 2001年第3期12卷 183-189页

作者： zhangzhi－Bin ZHANGshi－Li LaboratoryofNuclearAnalysesandTechniques ShanghaiInstituteofNuclearResearchTheChineseAcademyofSciencesShanghai201800 KungligaTekniskaHoegskolan DepartmentofElectronicsElectrum22

Annealing behavior, at different annealing temperatures, of an ultrathin Mo layer located between a Ti film and Si substrate or deposited on the top of sur -face of a Ti film was investigated by Rutherford baccscattering spectrometry (RBS), cross-sectional transmission electron microscopy (TEM) and energy dispersive X-ray spectrometry (EDS). In a Ti/Mo/Si structure, partially reacted film with layer struc- ture of Ti-rich silicide/TiSi2/(Mo, Ti)Si2 on a Si substrate was formed after 550℃ annealing for 30 min. The ratio of Mo to Ti in (Mo, Ti)Si2 layer decreases from ncar Si substrate upwards and becomes zero at about 20 nm away. In a Mo/Ti/Si structure, the surface Mo layer enhances the Si diffusion from the substrate during annealing. Mo bearing Ti rich silicide exists on the surface until 600℃ and then converts to (Mo, Ti)Si2 after 6500C annealing, and the atomic ratio of Mo to Ti decreases from the top surface into Ti silicide film, and becomes zero at about 30 nm away from the surface. In both cases of interface Mo and surface Mo layer, the atomic ratio of Mo to Ti in the region of (Mo, Ti)Si2 was found to be very low, with an average value of less than 0.2. Low content of Mo in Mo containing ternary *** leads easily to the formation of the stable phase of C54 (Mo, Ti)Si2, which acts as a templatc for the formation of C54 TiSi2 beneath when Mo is deposited on the surface.

关键词：钼薄膜退火行为 Ti-Si系统

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Randomized Terminal Linker-dependent PCR: A Versatile and Sensitive Method for Detection of DNA Damage

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Biomedical and Environmental Sciences 2002年第3期15卷 203-208页

作者： zhangzhi－WEI HENGZHENG－CHANG DepartmentofEnvironmentalHealth SchoolofPubilcHealthWestChinaCenterofMedicalSciencesSichuanUniversityChengdu610041 DepartmentofEnvironmentalHealth SchoolofPubilcHealthWestChinaCenterofMedicalScien

Objective To design and develop a novel, sensitive and versatile method for in vivo foot printing and studies of DNA damage, such as DNA adducts and strand breaks. Methods Starting with mammalian genomic DNA, single-stranded products were made by repeated primer extension, these products were ligated to a double-stranded linker having a randomized 3 overhang, and used for PCR. DNA breaks in p53 gene produced by restriction endonuclease AfaI were detected by using this new method followed by Southern hybridization with DIG-labeled probe. Results This randomized terminal linker-dependent PCR (RDPCR) method could generate band signals many-fold stronger than conventional ligation-mediated PCR (LMPCR), and it was more rapid, convenient and accurate than the terminal transferase-dependent PCR (TDPCR). Conclusion DNA strand breakage can be detected sensitively in the gene level by RDPCR. Any lesion that blocks primer extension should be detectable.

关键词： Randomized terminal linker-dependent PCR LMPCR p53 gene DNA damage

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