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A universal strategy for fast,scalable,and aqueous synthesis of multicomponent palladium alloy ultrathin nanowires

Science China Chemistry 2021年第2期64卷 245-252页

作者： Hao Lv xuwen guo Lizhi Sun Dongdong Xu Ben Liu College of Chemistry Sichuan UniversityChengdu 610064China Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023China

Noble metal alloy nanowires(NWs)with ultrathin diameters(2–3 nm)and precisely controllable elemental compositions have attracted dramatically growing attention for(electro)*** numerous achievements in past two decades,noble metal alloy NWs are mostly synthesized with the traditional oil-phase methods that suffer from some undesirable ***,we report a general strategy for fast,scalable,and aqueous synthesis of multicomponent Pd-based alloy ultrathin NWs with an average diameter of 2.6 nm,ranging from bimetallic PdM(PdFe,PdCo,PdNi,PdCu,PdZn,PdRu,PdRh,PdAg,PdCd,PdIr,PdPt,PdAu)and binary PdS/PdP NWs,to trimetallic PdM1M2 NWs(PdAuCu,PdCoNi,PdCuZn,PdCuNi,PdAgCu,PdAuCu,PdRuAg,PdAuRu,and PdPtAu),and to tetrametallic PdM1M2M3 NWs(PdAuAgCu,PdCoCuNi,PdAuCuNi,PdPtAuCu,and PdIrPtAu).The key to the success of this aqueous synthesis is the utilization of N2H4 as the extremely strong reducing agent that directs the synchronous reduction and anisotropic nucleation growth of multicomponent Pd alloy NWs along nanoconfined columnar phase assembled with amphiphilic dioctadecyldimethylammonium ***-resultant Pd-based alloy ultrathin NWs exhibit multiple structural and compositional synergies,which remarkably optimize the removal of poisoning ethoxy intermediates and thus improve electrocatalytic performance towards ethanol oxidation reaction(EOR).Among them,tetrametallic PdAuCuNi alloy ultrathin NWs hold a high EOR activity of 5.14 A mg-1 Pd and a low activation energy of 13.1 kJ mol^-1,both of which are much better than its counterpart catalysts alloyed with less *** work represents an important advance in precise aqueous synthesis of multicomponent noble metal alloy ultrathin NWs as the high-performance electrocatalysts for various targeted applications.

关键词： ultrathin nanowires multicomponent alloys palladium synthetic chemistry ethanol oxidation reaction

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The histone deacetylase inhibitor SAHA exerts a protective effect against myocardial ischemia/reperfusion injury by inhibiting sodium-calcium exchanger

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BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS 2023年第1期671卷 105-115页

作者： Shi, Xiaocui Yin, Yajuan guo, xuwen Liu, Mei Ma, Fangfang Tian, Li Zheng, Mingqi Liu, Gang Hebei Med Univ Hosp 1 Hebei Key Lab Cardiac Injury Repair Mech Study Hebei Int Joint Res Ctr Struct Heart DisDept Card Shijiazhuang 050000 Peoples R China Hebei Med Univ Hosp 1 Dept Cardiol Hebei Key Lab Heart & Metab Shijiazhuang 050000 Hebei Peoples R China

Calcium overload performs a crucial function in the pathogenesis of myocardial ischemia-reperfusion (I/ R) damage, which contributes to mitochondrial impairment and apoptosis of cardiomyocytes. Sub-eroylanilide hydroxamic acid (SAHA), a small molecule histone deacetylases inhibitor with modulatory capacity on Na+-Ca2+ exchanger (NCX), is proven to have protective potential towards cardiac remod-eling and injury, but the mechanism remains unclear. Hence, Hence, our present research explored the modulation of NCX-Ca2+-CaMKII by SAHA in myocardial I/R damage. Our outcomes indicate that in vitro hypoxia and reoxygenation models of myocardial cells, SAHA treatment inhibited the increase in expression of NCX1, intracellular Ca2+ concentration, expression of CaMKII and self-phosphorylated CaMKII, and cell apoptosis. In addition, SAHA treatment improved myocardial cell mitochondrial swelling inhibited mitochondrial membrane potential diminution and the openness of the mitochondrial permeability transition pore, and protected against mitochondrial dysfunction following I/R injury. In vivo, SAHA treatment alleviated the decrease in FS% and EF%, the increase in the myocardial infarct area, and myocardial enzyme levels caused by I/R injury, while also reducing myocardial cell apoptosis, and inhibiting mitochondrial fission and mitochondrial membrane rupture. These results indicated that SAHA treatment alleviated myocardial cell apoptosis as well as mitochondrial dysfunction resulting from myocardial I/R impairment, and contributed to myocardial function recovery by inhibiting the NCX-Ca2+- CaMKII pathway. These findings offered additional theoretical support to explore the mechanism of SAHA as a therapeutic agent in cardiac I/R damage and develop new treatment strategies. (c) 2023 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http://***/licenses/by/4.0/).

关键词： Myocardial ischemia/reperfusion Na+ -Ca2+ exchanger Histone deacetylase inhibitor CaMKII

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Synergistic Catalysis of Binary RuP Nanoclusters on Nitrogen-Functionalized Hollow Mesoporous Carbon in Hydrogen Production from the Hydrolysis of Ammonia Borane

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JOURNAL OF PHYSICAL CHEMISTRY LETTERS 2021年第1期12卷 696-703页

作者： Lv, Hao Wei, Ren guo, xuwen Sun, Lizhi Liu, Ben Sichuan Univ Coll Chem Chengdu 610064 Peoples R China Nanjing Normal Univ Jiangsu Collaborat Innovat Ctr Biomed Funct Mat Sch Chem & Mat Sci Jiangsu Key Lab New Power Batteries Nanjing 210023 Peoples R China

Exploring highly efficient nanocatalysts for hydrogen (H-2) production from catalytic hydrolysis of ammonia borane (AB) under ambient conditions and further unveiling their catalytic mechanism are of critical importance for renewable energy conversion technologies but remain big challenges. Herein, ultrafine binary RuP alloy nanoclusters homogeneously encapsulated onto nitrogen-functionalized hollow mesoporous carbon supports (RuP@NHMCs) are reported as a high-performance platinum (Pt)-free nanocatalyst for catalytic hydrolysis of AB at room temperature. Remarkable catalytic activity with a very high turnover frequency of 1774 mol(H2) mol(Ru)(-1) min(-1) and a low activation energy of 36.3 kJ mol(-1) is observed based on compositional and structural synergies of RuP@NHMCs. Results of control experiments and catalytic kinetics studies reveal that the rate-determining step of catalytic hydrolysis of AB is the oxidation cleavage of a covalently stable H-OH bond, while RuP@NHMCs result in multiple electronic, functional, size, and support effects that kinetically accelerate the cleavage of attacked H-OH. Furthermore, RuP@NHMCs exhibit a good catalytic activity with a high yield of >99% for tandem hydrogenation of nitroarenes coupled with the hydrolysis of AB. We strongly believe that the catalyst design principle reported here could provide a new opportunity for synthesizing other Pt-free high-performance nanocatalysts.

关键词： Catalysts Catalytic activity Nanoclusters Hydrolysis Nanocatalysts

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Ultrathin and Wavy PdB Alloy Nanowires with Controlled Surface Defects for Enhanced Ethanol Oxidation Electrocatalysis

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ACS APPLIED MATERIALS & INTERFACES 2021年第15期13卷 17599-17607页

作者： Wang, Yaru Lv, Hao Sun, Lizhi guo, xuwen Xu, Dongdong Liu, Ben Nanjing Normal Univ Jiangsu Collaborat Innovat Ctr Biomed Funct Mat Sch Chem & Mat Sci Jiangsu Key Lab New Power Batteries Nanjing 210023 Peoples R China Sichuan Univ Coll Chem Chengdu 610064 Peoples R China

Engineering crystalline structures/defects and elemental compositions is synthetically critical to optimize surface features of noble metal nanocrystals and thus improve their catalytic performances in various reactions. In this manuscript, we report a facile one-step aqueous synthesis of one-dimensional (1D) noble metal-metalloid alloy nanowires (NWs) with an ultrathin and wavy morphology, controlled crystalline defects, and binary PdB compositions as a highly efficient catalyst toward the electrochemical ethanol oxidation reaction (EOR). We show that the utilization of hexadecylpyridinium chloride as functional surfactant is of great importance to confine in-the-columnar epitaxial nucleation of anisotropic ultrathin PdB NWs, while the attachment growth precisely controls their surface crystalline defects with a wavy morphology. Meanwhile, this strategy is synthetically universal and can be readily extended to engineer an ultrathin wavy morphology and crystalline defect of ternary PdMB (M = Cu and Pt) alloy NWs. Owing to multiple structural and compositional merits, resultant PdB alloy NWs synergistically expose more electrocatalytically active sites and also kinetically accelerate the removal of CO-related poisons, remarkably improving electrocatalytic EOR activity and stability compared to their counterpart catalysts. Besides, wavy PdB alloy NWs are also electrochemically more active for electrocatalytic oxidation of other alcohols (methanol, glycerol, and glucose). The findings reported here thus shed a bright light on rational design of the high-performance metal alloy catalysts for their potential applications in fine chemical synthesis, fuel cells, and beyond.

关键词： nanowires crystalline defects metal-metalloid catalysis ethanol oxidation reaction

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Atomically ordered Rh₂P catalysts anchored within hollow mesoporous carbon for efficient hydrogen production

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CHEMICAL COMMUNICATIONS 2021年第92期57卷 12345-12348页

作者： guo, xuwen Chen, Xin Huang, Yanping Min, Xiaowen Kong, Chuncai Tang, Yawen Liu, Ben Nanjing Normal Univ Jiangsu Collaborat Innovat Ctr Biomed Funct Mat Sch Chem & Mat Sci Jiangsu Key Lab New Power Batteries Nanjing 210023 Peoples R China ME Instruments Inc Huahan Sci & Technol Ind Pk Shenzhen 518118 Peoples R China Sichuan Univ Ctr Engn Expt Teaching Sch Chem Engn Chengdu 610065 Peoples R China Sichuan Univ Coll Chem Key Lab Green Chem & Technol Minist Educ Chengdu 610064 Peoples R China Shaanxi Prov Key Lab Adv Funct Mat & Mesoscop Phy Sch Phys Minist EducKey Lab Nonequilibrium Synth & Modula Xian Jiaotong Univ Xian 710049 Peoples R China

Atomically ordered Rh2P nanoclusters encapsulated within a high-surface-area hollow mesoporous carbon nanoreactor are catalytically active for hydrogen production via the electrocatalytic hydrogen evolution reaction a... 详细信息

关键词： Hydrogen production

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Mesoporous Palladium-Boron-Sulfur Alloy Nanospheres for Efficient Hydrogen Evolution

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INORGANIC CHEMISTRY 2021年第7期60卷 4380-4384页

作者： guo, xuwen Chen, Zhichao Huang, Yanping Lv, Hao Wang, Yaru Sun, Lizhi Song, Kai Liu, Ben Nanjing Normal Univ Jiangsu Collaborat Innovat Ctr Biomed Funct Mat Sch Chem & Mat Sci Jiangsu Key Lab New Power Batteries Nanjing 210023 Peoples R China Shenzhen RELX Technol Co Ltd Shenzhen 518108 Peoples R China Sichuan Univ Coll Chem Chengdu 610064 Peoples R China Changchun Normal Univ Sch Life Sci Changchun 130032 Peoples R China Sichuan Univ Sch Chem Engn Ctr Engn Expt Teaching Chengdu 610065 Peoples R China

Ternary noble metal-metalloid-nonmetal PdBS alloy mesoporous nanospheres (MSs) with three-dimensional central-radial pore channels were prepared for an electrocatalytic hydrogen evolution reaction. The synthesis was performed via precise control in the reduction and nucleation growth of ternary PdBS alloy MSs along confined cylinder mesophases assembled by amphiphilic dioctadecyldimethylammonium chloride. The resultant PdBS alloy MSs disclosed a remarkably improved electrocatalytic performance due to their structural and compositional synergies. This finding extended our knowledge on the rational design and targeted synthesis of novel noble metal-metalloid-nonmetal alloys with desired structures and morphologies for catalysis and other applications.

关键词： Palladium Alloys Genetics Evolution reactions Transmission electron microscopy

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Highly efficient synthesis of hydrogen-bonded aromatic tetramers as macrocyclic receptors for selective recognition of lithium ions

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ORGANIC CHEMISTRY FRONTIERS 2019年第15期6卷 2654-2661页

作者： guo, xuwen Yang, Yizhou Peng, Zhiyong Cai, Yimin Feng, Wen Yuan, Lihua Sichuan Univ Coll Chem Key Lab Radiat Phys & Technol Minist Educ Chengdu 610064 Sichuan Peoples R China

Persistently folded aromatic amide macrocycles comprising four monomeric units (biphenyl-cyclo[4]aramide) were synthesized with high efficiency via a one-step approach along with the larger cyclic oligomer, biphenyl-cyclo[8]aramide as a minor product. Such cyclic hydrogen-bonded aromatic tetramers feature four amide oxygens enclosing a cavity with small dimensions, enabling the selective complexation of alkali metal ions, particularly Li+, with high affinity. The cyclization efficiency and selectivity of smaller macrocycles was further improved using fragment coupling and Li+-based template approaches. In addition, the superior binding ability of biphenyl-cyclo[4]aramide towards Li+ over its acyclic analogues was observed, demonstrating a remarkable macrocyclic effect.

关键词： Amides

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Yonarolide A, an unprecedented furanobutenolide-containing norcembranoid derivative formed by photoinduced intramolecular[2+2] cycloaddition

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Chinese Chemical Letters 2023年第2期34卷 420-424页

作者： Yeqing Du Ligong Yao xuwen Li Yuewei guo School of Chinese Materia Medica Nanjing University of Chinese MedicineNanjing 210023China State Key Laboratory of Drug Research Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China Drug Discovery Shandong Laboratory Bohai Rim Advanced Research Institute for Drug DiscoveryYantai 264117China

Eight polycyclic furanobutenolide-containing norcembrane diterpenoids featuring C19 frameworks(1–8)were rapidly recognized and isolated from the Hainan soft coral Sinularia sp. by the HSQC-based small molecule accurate recognition technology. Yonarolide A(1a), featuring an unprecedented 5/6/4/4/7 pentacyclic ring skeleton, was surprisingly obtained as a transformed product by leaving compound 1 under indoor natural light, and was further proved to be a [2 + 2] cycloaddition product of 1 by photochemical reaction. The absolute stereochemistry of 1a and the three known norcembrane diterpenoids 1, 4, and7 were determined by using X-ray diffraction(XRD) analyses. Further, with the aid of XRD analysis, the structure of scabrolide B(2), which was previously reported of possessing 5/6/7 tricyclic skeleton, was firmly revised as 2a with the rare inelegane skeleton featured by the highly oxygenated 5/7/6 tricyclic carbocycle.

关键词： Soft coral Sinularia Norcembranoid Photocycloaddition SMART method

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Understanding the Mechanisms of Texture Evolution of a Fe-24Cr-22Ni-7Mo Super Austenitic Stainless Steel During cold Rolling and Annealing

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METALS AND MATERIALS INTERNATIONAL 2024年第10期30卷 2777-2790页

作者： Liao, Luhai Dai, Shang guo, Rui Yuan, xuwen Li, Fengguang Hubei Univ Automot Technol Sch Mat Sci & Engn Shiyan 442002 Peoples R China Hubei Univ Automot Technol Key Lab Automot Power Train & Elect Shiyan 442002 Peoples R China Univ Sci & Technol Beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China

In present study, the texture evolution during cold rolling and subsequent annealing of a Fe-24Cr-22Ni-7Mo super austenitic stainless steel was investigated, and new insights into the mechanisms of texture evolution were obtained. The results show that macrotexture evolution during cold rolling can be categorized into two stages. Below 33.3% cold reduction, the material form strong Goss, Copper, and S texture component due to dislocation plane slipping. Above 33.3% reduction, strong Brass, Goss, and Copper-Twin texture components are formed, accompanied by a decrease in Copper and S component content. Moreover, when the cold reduction reaches 66.6%, the strength of the gamma-fibre texture suddenly increases. This increase is attributed to the rotation of the Copper-oriented grains and the Copper-Twin-oriented grains in the lamellar twin region to {111}<121> and {111}<211> along < 011>//TD direction, respectively. It is significant to note that twinning plays a dominant role in the formation of the Brass-type texture in the super austenitic stainless steel at large deformation. Additionally, the annealing of cold deformed materials results in the formation of random and scattered recrystallization texture. This may be due to the small difference in deformation energy storage of grains with different orientations after austenite deformation.

关键词： Super austenitic stainless steel Texture Microstructure Rolling Annealing

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Strong positive allosteric cooperativity in ternary complexes based on hydrogen-bonded aromatic amide macrocycles

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CHEMICAL COMMUNICATIONS 2019年第33期55卷 4869-4872页

作者： Peng, Zhiyong guo, xuwen Xu, Weitao Li, Jian Deng, Pengchi Xiao, Xin Feng, Wen Yuan, Lihua Sichuan Univ Analyt & Testing Ctr Minist Educ Coll ChemKey Lab Radiat Phys & Technol Chengdu 610064 Sichuan Peoples R China Guizhou Univ Key Lab Macrocycl & Supramol Chem Guizhou Prov Guiyang 550025 Guizhou Peoples R China

Three new hydrogen-bonded aromatic amide macrocycles with eight residues were synthesized. The first single crystal structure of this class of larger macrocycles was obtained, which reveals a saddle-like conformation. Interestingly, in sharp contrast to previous negative cooperativity in binding paraquat with cyclo[6]aramide, strong positive allosteric cooperativity in ternary complexes was observed. This may open an avenue for the construction of mechanically interlocked molecules with these larger H-bonded macrocycles.

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