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Solid-solution alloy nanoclusters of the immiscible gold-rhodium system achieved by a solid ligand-assisted approach for highly efficient catalysis

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Nano Research 2020年第1期13卷 105-111页

作者： Xinchun Yang Zhangpeng Li Mitsunori Kitta Nobuko Tsumori wenhan guo Zitao Zhang Jianbo Zhang Ruqiang Zou Qiang Xu Institute of Electrochemical Energy National Institute of Advanced Industrial Science and Technology(AIST)IkedaOsaka563-8577Japan Graduate School of Engineering Kobe UniversityNada KuKobeHyogo657-8501Japan Department of Applied Chemistry and Chemical Engineering Toyama National College of TechnologyToyama939-8630Japan Department of Materials Science and Engineering Peking UniversityBeijing100871China Centre for High-Pressure Science and Technology Advanced Research Beijing100094China AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory YoshidaSakyo-kuKyoto606-8501Japan

Striking effects are expected in solid-solution alloying,which offers enormous possibilities for various applications,especially in industrial catalysis.However,phase diagrams have revealed that a wide range of metallic elements are immiscible with each other even above their melting points.Achieving such unknown alloying between different immiscible metallic elements is highly desirable but challenging.Here,for the first time,by using an innovative solid ligand-assisted approach,we achieve the solid-solution alloying between the bulk-immiscible Au and Rh in plenty of clean,ultrafine(∼1.6 nm)and highly dispersed nanoclusters.The solid-solution alloying of immiscible Au and Rh significantly enhances their catalytic performance toward the hydrogen evolution from formic acid in contrast to the monometallic Au and Rh nanoclusters.Moreover,the resultant binary solid-solution nanoclusters are stable without any segregation during catalytic reactions.The approach demonstrated here for homogeneously mixing the immiscible metals at the atomic scale will benefit the creation of advanced alloys and their catalytic applications in future.

关键词： solid-solution alloys metal nanoclusters formic acid dehydrogenation heterogeneous catalysis

Metal-organic framework-derived Fe/Cu-substituted Co nanoparticles embedded in CNTs-grafted carbon polyhedron for Zn-air batteries

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Carbon Energy 2020年第2期2卷 283-293页

作者： Kexin Zhang Yelong Zhang Qinghua Zhang Zibin Liang Lin Gu wenhan guo Bingjun Zhu Shaojun guo Ruqiang Zou Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials Department of Materials Science and EngineeringCollege of EngineeringPeking UniversityBeijingChina Department of Applied Physics and Materials Wuyi UniversityJiangmenGuangdong ProvinceChina Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijingChina Institute of Clean Energy Peking UniversityBeijingChina

Metal-organic frameworks(MOFs)and MOF-derived materials have attracted great attention as alternatives to noble-metal based electrocatalysts owing to their intriguing structure properties,especially for high efficiency and stable oxygen reduction reaction(ORR).Herein,we employed a one-pot reaction to make a multimetal(Fe,Co,Cu,and Zn)mixed zeolitic imidazolate framework(MM-ZIF)via adopting a simple in situ redox reaction.Further pyrolysis of the target MM-ZIF,a highly porous carbon polyhedron(FC-C@NC)grafted with abundant carbon nanotubes was obtained,in which ultrasmall Co nanoparticles with partial lattice sites substituted by Fe and Cu were embedded.The obtained FC-C@NC possessed large surface area,highly porous structure,widely-spread metal active sites,and conductive carbon frameworks,contributing to outstanding ORR activity and long-term stability.It displayed superior tolerance to methanol crossover and exceeded the commercial Pt/C catalyst and most previously reported non-noble-metal catalysts.Impressively,the as-produced FC-C@NC-based zinc-air battery afforded an open-circuit potential of 1.466 V,a large specific capacity of 659.5 mAh/g,and a high gravimetric energy density of 784.3 Wh/kgZn,significantly outperforming the Pt/C-based cathode.

关键词： electrocatalysis lattice sites substitution metal-organic frameworks oxygen reduction reaction zinc-air battery

Highly efficient K-Fe/C catalysts derived from metal-organic frameworks towards ammonia synthesis

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Nano Research 2019年第9期12卷 2341-2347页

作者： Pengqi Yan wenhan guo Zibin Liang Wei Meng Zhen Yin Siwei Li Mengzhu Li Mengtao Zhang Jie Yan Dequan Xiao Ruqiang Zou Ding Ma Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engine ering and College of Engineeringand BIC-ESATPeking UniversityBeijing 100871China Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials Department of Materials Science and EngineeringCollege of EngineeringPeking UniversityBeijing 10087China State Key Laboratory of Separation Membranes and Membrane Processes School of Chemistry and Chemical EngineeringTianjin Polytechnic UniversityTianjin 300387China Department of Chemistry and Chemical Engineering University of New HavenWest HavenCT 06516USA

Fe-based catalysts have been discovered as the best elementary metal-based heterogeneous catalysts for the ammonia synthesis in industrial application during the last century.Herein,a novel and scalable strategy is developed to prepare the K-promoted Fe/C catalyst with extremely high Fe loading (> 50 wt.%) through pyrolysis of the Fe-based metal-organic framework (MOF) xerogel.The obtained K-Fe/C catalysts exhibited superior activity and stability towards ammonia synthesis.The weight-specific reaction rate of Fe/C with K2O as promoter can achieve 12.4 mmol·g-1·h-1 at 350 ℃ and 30.4 mmol·g-1·h-1 at 400 ℃,approximately four and two times higher than that of the commercial fused-iron catalyst (3.4 mmol·g-1·h-1 at 350 ℃ and 16.7 mmol·g-1·h-1 at 400 ℃) under the same condition,respectively.The excellent performance of K-Fe/C can be ascribed to the inherited structure derived from the metal-organic frame precursors and the promotion of potassium,which can modify the binding energy of reactant molecules on the Fe surface,transfer electrons to iron for effective activation of nitrogen,prevent agglomeration of Fe nanoparticle (NPs) and restrain side reaction of carbon matrix to methane.

关键词： metal-orga nic frameworks pyrolysis ammonia syn thesis ir on nano particles K promotion

丁苯酞通过调控小胶质细胞极化在创伤性脑损伤中的神经保护作用研究

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国际免疫学杂志 2024年第2期47卷 136-142页

作者：郭温晗李杭黄成科许凤燕方力群哈尔滨医科大学人体解剖学教研室哈尔滨150081 哈尔滨医科大学附属第四医院神经内科哈尔滨150001 哈尔滨医科大学基础医学院哈尔滨150081

目的探讨丁苯酞(3-n-butylphthalide,NBP)调控小胶质细胞的极化反应在创伤性脑损伤(traumatic brain injury,TBI)中的神经保护作用。方法27只雄性C57BL/6小鼠随机分配(每组9只):假手术组(Sham组)、TBI组和NBP组。Sham组和TBI组给予植物... 详细信息

目的探讨丁苯酞(3-n-butylphthalide,NBP)调控小胶质细胞的极化反应在创伤性脑损伤(traumatic brain injury,TBI)中的神经保护作用。方法27只雄性C57BL/6小鼠随机分配(每组9只):假手术组(Sham组)、TBI组和NBP组。Sham组和TBI组给予植物油,NBP组给予等体积100 mg/kg NBP,连续7 d。TBI 3 d后,干湿法评估小鼠脑水肿情况。应用改良版小鼠神经功能缺损评分(modified neurological severity score,mNSS)和转棒疲劳试验检测小鼠损伤后第1、3、7天的神经运动功能恢复情况。免疫组织化学法检测损伤皮层周围区抗离子钙结合适配器分子1(ionized calcium binding adapter molecule 1,Iba1)标记的小胶质细胞活化情况,免疫荧光染色检测胶质纤维酸性蛋白(glial fibrillary acidic protein,GFAP)标记的星形胶质细胞活化情况。通过精氨酸酶1(arginase-1,Arg1)与Iba1,诱导型一氧化氮合酶(inducible nitric oxide synthase,iNOS)与Iba1双重染色检测损伤周围区小胶质细胞M1型标志物iNOS及M2型标志物Arg1表达量;髓鞘碱性蛋白(myelinbasic protein,MBP)检测髓鞘丢失情况。结果在mNSS实验中,与TBI组相比,NBP组分别在损伤后的第1、3、7天,小鼠的神经功能评分逐渐降低(P第1天=0.012,P第3天=0.020,P第7天=0.046)。与TBI组相比,匀速转棒实验中,NBP组小鼠停留时间在第3天明显增加(P第3天=0.031);随NBP治疗时间延长,小鼠在第3、7天的匀加速转棒中停留时间逐渐增加(P第3天=0.024,P第7天=0.039)。进一步病理学检测发现,与TBI组相比,NBP组损伤区MBP髓鞘完整性部分恢复(P=0.026);小胶质细胞和星形胶质细胞活化标志物Iba1和GFAP表达降低(PIba1=0.007,PGFAP=0.006)。与TBI组相比,NBP组M2型的小胶质细胞标志物Arg1增加(PArg1/Iba1=0.004),M1型小胶质细胞标志物iNOS减少(PiNOS/Iba1=0.012)。结论NBP可以部分改善TBI小鼠神经运动功能障碍,抑制小胶质细胞和星形胶质细胞的活化,促进小胶质细胞向M2表型的极化。

关键词：丁苯酞创伤性脑损伤神经炎症小胶质细胞极化

基于正交设计的鞋面革湿态染整工艺设计与优化

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中国皮革 2024年第5期53卷 1-7页

作者：韦永红郭文翰李瑞强张琪温会涛但卫华福建省皮革绿色设计与制造重点试验室福建晋江362271 兴业皮革科技股份有限公司国家企业技术中心福建晋江362261 中国轻工业制革绿色工程实验室兴业皮革科技股份有限公司福建晋江362261 四川大学制革清洁技术国家工程研究中心四川成都610065

应用正交设计方法,以坯革收缩温度、废液铬含量、坯革增厚率、撕裂力、柔软度、得革率为考察指标,对牛鞋面革湿态染整工艺的复鞣、填充、加脂工序进行设计与优化。试验结果表明,复鞣最佳工艺为醛酸复鞣剂用量6%,转动时间60 min,铬鞣剂用... 详细信息

应用正交设计方法,以坯革收缩温度、废液铬含量、坯革增厚率、撕裂力、柔软度、得革率为考察指标,对牛鞋面革湿态染整工艺的复鞣、填充、加脂工序进行设计与优化。试验结果表明,复鞣最佳工艺为醛酸复鞣剂用量6%,转动时间60 min,铬鞣剂用量4%,转动时间90 min;填充最佳工艺为丙烯酸树脂用量4%,氨基树脂用量6%,合成鞣剂用量8%,植物栲胶用量4%;加脂最佳工艺为合成油用量6%,牛蹄油用量3%,卵磷脂用量4%,合成酯用量3%;最佳工艺集成后所制得的鞋面革性能满足QB/T 1873—2010的要求。

关键词：制革工程正交设计鞋面革湿态染整

基于单因素法的植物鞣剂-沸石鞣剂结合鞣革研究

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皮革与化工 2024年第2期41卷 8-15页

作者：郭文翰韦永红聂子锐吴渝玉温会涛但卫华福建省皮革绿色设计与制造重点试验室福建晋江362271 兴业皮革科技股份有限公司国家企业技术中心福建晋江362261 中国轻工业制革绿色工程试验室兴业皮革科技股份有限公司福建晋江362261 四川大学制革清洁技术国家工程研究中心四川成都610065

为改善植物鞣白湿革性能,引入了沸石鞣剂,以湿热收缩温度和物理机械性能(撕裂强度和抗张强度)为评价指标,采用单因素法,优化出基于植物鞣剂的沸石结合鞣的最佳工艺。试验结果表明,植物鞣剂-沸石结合鞣最佳条件为:沸石鞣剂的用量为5%,鞣... 详细信息

为改善植物鞣白湿革性能,引入了沸石鞣剂,以湿热收缩温度和物理机械性能(撕裂强度和抗张强度)为评价指标,采用单因素法,优化出基于植物鞣剂的沸石结合鞣的最佳工艺。试验结果表明,植物鞣剂-沸石结合鞣最佳条件为:沸石鞣剂的用量为5%,鞣制时间50 min,提碱终点p H为5.5,鞣制终点温度30℃,所得白湿革的收缩温度达到94.55℃,撕裂强度达到55.75 N/mm,抗张强度达到11.44 N/mm^(2),部位差显著降低。该工艺对植鞣白湿革的改善效果明显,为无铬结合鞣技术提供了新思路。

关键词：制革工程无铬鞣植物鞣沸石鞣结合鞣法

Innovations in metallurgical and materials processes:advancing liquid theory and honoring Prof.Han-jie guo's contributions to physical chemistry in metallurgy

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Journal of Iron and Steel Research(International) 2024年第1期31卷 1-2页

作者： Shuai Liu Jing guo Han-jie guo School of Artificial Intelligence Beijing Technology and Business UniversityBeijing100048China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing100083China

Spanning three decades,Prof.Han-jie guo's research group has dedicated itself to exploring the fundamental theories and practical applications of physical chemistry within the realm of metallurgy.Operating under the a... 详细信息

关键词： chemistry liquid complexes

Light People:Prof.Eric Mazur speaks about ultrafast optics and education

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Light(Science & Applications) 2024年第3期13卷 402-406页

作者： Chenzi guo Yang Li Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchunChina State Key Laboratory of Precision Measurement Technology and Instrument Department of Precision InstrumentTsinghua UniversityBeijingChina

Prof.Eric Mazur is a great influencer over and beyond the optics community.As a physicist,he is a pioneer of ultrafast optics and was one of the inventors of colliding-pulse mode-locked laser.As an educator,he not only gave talks to thousands,but also revolutionized teaching with his globally renowned methodology“Peer Instruction”.As a leader and entrepreneur,he co-founded several companies and was President of Optica(formerly the Optical Society)and currently is the Chair of the Optica Foundation.Here,Light:Science&Applications talked with Prof.Eric Mazur about his opinions on research,education and industry.The full interview video can be found in the Supplementary File.

关键词： optics education companies

Emerging direct current triboelectric nanogenerator for high-entropy mechanical energy harvesting

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Science China(Technological Sciences) 2024年第5期67卷 1297-1316页

作者： CHEN Jie guo RuiLong guo HengYu College of Physics and Electronic Engineering Chongqing Normal UniversityChongqing 401331China Department of Applied Physics Chongqing UniversityChongqing 401331China

In the era of the Internet of Things(IoT),the provision of sustainable power to distributed,mobile,and low-power-consumption electronic devices is a critical challenge.To overcome this challenge,the triboelectric nanogenerator(TENG),a highly efficient high-entropy mechanical energy harvesting device,was developed in 2012.This device enables the direct conversion of irregular and low-frequency mechanical energy into pulsed alternating current(AC)signals.However,the incompatibility of most electronic devices with AC signals necessitates rectifier circuits or generators that deliver direct current(DC)signals.In recent years,DC-TENGs have undergone extensive development,achieving significant milestones in various application fields while also facing crucial challenges that require solutions.In this review,three categories of DC-TENG devices with distinct operating mechanisms are comprehensively explored:multiphase coupling,mechanical rectification,and air breakdown.Their typical structures and working mechanisms are thoroughly discussed,and specific output performance limitations,along with corresponding optimization strategies,are identified.Furthermore,the applications of DC-TENGs in various scenarios are summarized.Finally,the challenges faced by DC-TENGs and potential solutions are analyzed to guide further advancements in this technology.

关键词： TENG direct current working mechanisms output performance limitations optimization strategies