检索结果-南通市图书馆

Journal of Energy Chemistry 2024年第5期92卷 207-215页

作者： Yunbo Li Jianchao Yue Chaoyi Yang Hongnan Jia Hengjiang Cong Wei Luo College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072HubeiChina

Metastable nanostructured electrocatalyst with a completely different surface environment compared to conventional phase-based electrocatalyst often shows distinctive catalytic property.Although ru-based electrocatalysts have been widely investigated toward hydrogen oxidation reaction(HOR)under alkaline electrolytes,these studies are mostly limited to conventional hexagonal-close-packed(hcp)phase,mainly arising from the lack of sufficient synthesis strategies.In this study,we report the precise synthesis of metastable binary ruW alloy with face-centered-cubic(fcc)phase.We find that the introduction of W can serve as fcc phase seeds and reduce the formation energy of metastable fcc-ruW alloy.Impressively,fcc-ruW exhibits remarkable alkaline HOR performance and stability with the activity of 0.67 mA cm_(ru)^(-2)which is almost five and three times higher than that of hcp-ru and commercial Pt/C,respectively,which is attributed to the optimized binding strength of adsorbed hydroxide intermediate derived from tailored electronic structure through W doping and phase engineering.Moreover,this strategy can also be applied to synthesize other metastable fcc-ruCr and fcc-ruMo alloys with enhanced HOR performances.

关键词： Hydrogen oxidation reaction Metastable phase Face-centered cubic(fcc) ru Phase engineering

ru-K-NaY催化草酸二甲酯脱羰基制备碳酸二甲酯

在线全文

学校读者我要写书评

暂无评论

化工进展 2024年

作者：张日东吕建华刘继东郭豹李文松河北工业大学化工学院

以NaY分子筛为载体，通过KNO3溶液对NaY分子筛进行预处理，记为K-NaY。之后采用过量浸渍的方法，制备了一系列不同ru含量的ru-K-NaY催化剂。并首次将其用于草酸二甲酯(DMO)脱羰基制备碳酸二甲酯(DMC)的反应。研究了ru负载量和催化剂碱... 详细信息

以NaY分子筛为载体，通过KNO3溶液对NaY分子筛进行预处理，记为K-NaY。之后采用过量浸渍的方法，制备了一系列不同ru含量的ru-K-NaY催化剂。并首次将其用于草酸二甲酯(DMO)脱羰基制备碳酸二甲酯(DMC)的反应。研究了ru负载量和催化剂碱量对反应的影响。采用XPS、BET和CO2-TPD等对ru-K-NaY催化剂的表面和结构性能以及碱性性能进行了表征，确定了增加催化剂弱碱活性位点数量以及ru0物种数量可以提高催化剂的催化活性，促进碳酸二甲酯的生成。以ru-K-NaY作为催化剂，对反应条件进行了优化，在最佳反应条件下，DMO转化率和DMC选择性分别为83%和69%。最后研究了催化剂的稳定性，ru-K-NaY催化剂循环使用5次后催化活性基本不变。

关键词：沸石催化剂催化剂载体碳酸二甲酯 ru

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

CeO2微球负载ru催化氧化乙酸乙酯

桂林理工大学学报 2024年第2期 313-320页

作者：王晓娇莫德清莫胜鹏李武超温新颖丁学刚李俊任恩伯石卓凡桂林电子科技大学生命与环境科学学院桂林理工大学环境科学与工程学院

利用水热法制备了CeO2微球，并采用沉积沉淀法在CeO2微球表面负载ru,制备ru/CeO2微球。通过SEM观察了CeO2微球的外观形貌；利用TEM观测了CeO2微球表面ru颗粒分布情况；XRD对样品的物相进行了分析；用氮气吸附-解吸比较了微球负载ru前后... 详细信息

利用水热法制备了CeO2微球，并采用沉积沉淀法在CeO2微球表面负载ru,制备ru/CeO2微球。通过SEM观察了CeO2微球的外观形貌；利用TEM观测了CeO2微球表面ru颗粒分布情况；XRD对样品的物相进行了分析；用氮气吸附-解吸比较了微球负载ru前后比表面积和孔隙分布的变化；XPS测试分析了微球负载ru前后表面化学结构的变化；通过H2-TPR和O2-TPD表征了微球负载ru前后催化剂还原性和氧活化能力的变化，并进行了样品催化氧化乙酸乙酯性能的测试。结果表明，ru/CeO2的结构与CeO2相似，均为介孔材料，其中ru可以离子态进入CeO2晶格，造成CeO2晶格畸变；ru/CeO2催化剂呈现出贵金属和二氧化铈的强相互作用，活性氧物种较CeO2增加，储氧释氧能力增强，促进了低温催化氧化乙酸乙酯性能的提升；随着ru负载量的增加，ru/CeO2催化氧化乙酸乙酯的性能先提高后逐渐趋于平稳，负载量为1.0%时的样品效果最优，其T90与CeO2的相比降低了28.5℃。

关键词： ru CeO2微球协同作用乙酸乙酯催化氧化

ru、Y对铸造高温合金与陶瓷界面反应的影响

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

铸造 2024年第6期73卷 810-817页

作者：史振学潘宏涛郝齐赞刘世忠北京航空材料研究院先进高温结构材料重点实验室北京100095

在定向凝固炉中,采用相同的硅基陶瓷型芯,刚玉陶瓷型壳,熔炼工艺和定向凝固工艺制备了四种不同ru、Y含量的单晶高温合金叶片,研究了组织稳定性提升元素ru、抗氧化性增强元素Y对合金与陶瓷材料界面反应的影响。研究结果表明,合金中不含ru... 详细信息

在定向凝固炉中,采用相同的硅基陶瓷型芯,刚玉陶瓷型壳,熔炼工艺和定向凝固工艺制备了四种不同ru、Y含量的单晶高温合金叶片,研究了组织稳定性提升元素ru、抗氧化性增强元素Y对合金与陶瓷材料界面反应的影响。研究结果表明,合金中不含ru、Y时,合金与型壳发生的界面反应主要为物理粘砂作用,未见合金元素与型壳发生明显的化学反应,合金与型芯发生轻微的界面反应,除了物理作用,还发生了Al与SiO2的化学反应。合金中添加ru,对合金与型壳或型芯的界面反应无影响。合金中添加0.01%Y后,合金与陶瓷型壳或型芯的界面反应稍有增加,但由于其添加量较少,故影响较小。

关键词：陶瓷高温合金界面反应 ru Y

维普期刊数据库博看期刊

Rational design of ru species on N-doped graphene promoting water dissociation for boosting hydrogen evolution reaction

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2022年第3期65卷 521-531页

作者： Zhida Chen Wenda Chen Lirong Zheng Tao Huang Jing Hu Yaqi Lei Qi Yuan Xiangzhong Ren Yongliang Li Lei Zhang Shaoluan Huang Shenghua Ye Qianling Zhang Xiaoping Ouyang Xueliang Sun Jianhong Liu Graphene Composite Research Center Shenzhen UniversityCollege of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen 518060China Department of Mechanical and Materials Engineering University of Western OntarioLondonOntario N6A 5B9Canada Shenzhen Eigen-Equation Graphene Technology Co.Ltd. Shenzhen 518000China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049China School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China

In this study,the morphological distribution of ru on nitrogen-doped graphene(NG)could be rationally regulated via modulating the combination mode between ru precursor and the zeolite imidazolate framework-8(ZIF-8).The cation exchange and host-guest strategies respectively resulted in two different combination modes between ru precursor and ZIF-8 anchored on graphene.Following pyrolysis of the above precursors,ru single-atom sites(SASs)with and without ru nanoparticles(NPs)were formed selectively on NG(denoted as ru SASs+NPs/NG and ru SASs/NG,respectively).ru SASs+NPs/NG exhibited excellent hydrogen evolution reaction(HER)performance in alkaline solutions(η_(10)=12 mV,12.57 A mg^(-1)_(ru) at 100 mV),which is much better than ru SASs/NG.The experimental and theoretical study revealed that ru SASs could adsorb hydrogen with optimal adsorption strength,while ru NPs could lower the barrier of water molecule dissociation,and thus ru SASs and ru NPs could synergistically promote the catalytic performance of HER in alkaline solutions.

关键词： ru single atomic sites nanoparticles water dissociation synergistic effect

Site difference influence of anchored ru in mesoporous carbon on electrocatalytic performance toward pH-universal hydrogen evolution reaction

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第12期42卷 4015-4028页

作者： Xiao-Fang Ma He Xiao Yan-Ying Jing Yang Gao Ying-Luo He Man Zhao Jian-Feng Jia Hai-Shun Wu Key Laboratory of Magnetic Molecules and Magnetic Information Materials Ministry of Education School of Chemical and Material ScienceShanxi Normal UniversityTaiyuan 030032China Department of Applied Chemistry School of EngineeringUniversity of ToyamaToyama 930-8555Japan

ru-based electrocatalysts have demonstrated excellent electrocatalytic performance toward hydrogen evolution reaction(HER).However,designing ru nanoparticles/nanoclusters(ru NPs/NCs)with abundant accessible active sites is challenging.Herein,a selective facile hydrothermal in situ polymerization strategy is described to accurately control the anchoring point of ru in hollow mesoporous carbon spheres(HMCs)(outer surface,HMCs@ru;cavity,ru@HMCs;and pore channels,ru/SHMCs).The HER mechanisms of the three catalysts over a wide pH range were revealed by analyzing the loading position,content,dispersion,particle size,and valence state of ru.HMCs@ru shows excellent area activity,with overpotentials of 64.3,2.8,and 78.1 mV at 10 mA·cm^(-2)in0.5 mol·L^(-1)H_(2)SO_(4),1 mol·L^(-1)KOH;and 0.5 mol·L^(-1)phosphate buffer saline(PBS)solutions,respectively.ru/S-HMCs exhibit high mass activity,with values 43.3,2.9,and 12.7 times those of Pt/C in alkaline,acidic,and neutral media,respectively,at-50 mV(vs.reversible hydrogen electrode(RHE)).After 2000 cyclic voltammetry cycles,the performances of HMCs@ru and ru/S-HMCs hardly decrease,indicating good stability.The excellent electrocatalytic activity can be attributed to two main factors:(1)the confinement effect,which not only promotes high ru dispersion but also prevents the leaching of active metal under harsh conditions,and(2)their excellent structural characteristics.The catalyst structure features a large hollow located in the center(~160 nm in diameter)and an ultrathin monolayer of mesopores(~6 nm)uniformly distributed on the hollow shells,ensuring fast mass diffusion and electron transfer kinetics,as well as complete accessibility of catalytic sites.

关键词： Confinement effect ru Monolayer hollow mesoporous carbon(HMC) Hydrogen evolution reaction(HER)

Electrochemical disproportionation strategy to in-situ fill cation vacancies with ru single atoms

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第6期15卷 4980-4985页

作者： Kang Xiao run-Tong Lin Jin-Xin Wei Nan Li Hui Li Tianyi Ma Zhao-Qing Liu School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials Guangzhou UniversityGuangzhou 510006China Centre for Translational Atomaterials Swinburne University of TechnologyHawthornVIC 3122Australia School of Science RMIT UniversityMelbourneVIC 3000Australia

Supported single-atom catalysts(SACs)possess high catalytic activity,selectivity,and atom utilizations.However,the atom coordination environments of SACs are difficult to accurately regulate due to the high complexity of coordination site and local environment of support.Herein,we develop an in-situ electrochemical cation-exchange method to fill the cation vacancies in MnO_(2)with ru single atoms(SAs).This obtained catalyst exhibits high mass activity,which is~44 times higher than commercial ruO2 catalyst and excellent stability,superior to the most state-of-the-art oxygen evolution reaction(OER)catalysts.The experimental and theoretical results confirm that the doped ru can induce charge density redistribution,resulting in the optimized binding of oxygen species,and the strong covalent interaction between ru and MnO2 for resisting oxidation and corrosion.This work will provide a new concept in the synthesis of well-defined local environments of supported SAs.

关键词： single-atom catalysts MnO_(2) ru disproportionation oxygen evolution reaction

Construction of ru/WO3 with hetero-interface structure for efficient hydrogen evolution reaction

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

能源化学:英文版 2023年第8期83卷 150-157,I0006页

作者： Xin Xie Yunxiao Fan Wanyu Tian Meng Zhang Jialin Cai Xingang Zhang Jie Ding Yushan Liu Siyu Lu Green Catalysis Center College of ChemistryZhengzhou UniversityZhengzhou 450001HenanChina College of Material Henan Key Laboratory of Aeronautical Materials and Application TechnologyZhengzhou University of AeronauticsZhengzhou 4500oHenanChina

Water electrolysis is considered as one most promising technique for hydrogen production.The high efficiency electrocatalyst is the key to accelerating the sluggish kinetics of the hydrogen evolution reaction(HER) in alkaline media.In this work,an efficient HER electrocatalyst with hetero-interfacial metal-metal oxide structure was constructed through a redox solid phase reaction(SPR) strategy.During the annealing process under Ar atmosphere,ruO_(2) and WS_(2)in ruO_(2)/WS_(2)precursor were converted to ru nanoparticles(NPs) and WO3in situ,where tiny ru NPs and oxygen vacancies were uniformly distributed onto the newly formed WO3nanosheets.Different characterization techniques were adopted to confirm the successful formation of ru/WO_(3)electrocatalyst(RWOC).The optimized RWOC sample annealed at 400℃ exhibited the low overpotential value of 13 mV at a current density of 10 mA cm^(-2)and strong durability under the alkaline condition.Density functional theoretical calculations further revealed that the promoted adsorption/desorption rate of reaction intermediates and the accelerated kinetics of HER process were deduced to the synergistic effect between ru and WO_(3)in electrocatalyst.This work provides a feasible method to fabricate highly efficient HER electrocatalysts.

关键词： ru WO_(3) Hetero-interface Hydrogen evolution reaction Electrocatalyst

Development of an in-situ H_(2)reduction and moderate oxidation method for 3,5-dimethylpyridine hydrogenation in trickle bed reactor

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2022年第12期16卷 1807-1817页

作者： Tao Lin Xiaoxun Ma School of Chemical Engineering Northwest UniversityXi’an 710069China Kaili Catalyst&New Materials Co. Ltd.Xi’an 710201China Shaanxi Key Laboratory of Catalytic Materials and Technology Xi’an 710201China Chemical Engineering Research Center of the Ministry of Education(MOE)for Advanced Use Technology of Shanbei Energy Xi’an 710069China Shaanxi Research Center of Engineering Technology for Clean Coal Conversion Xi’an 710069China Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi Xi’an 710069China International Scientific and Technological Cooperation Base of the Ministry of Science and Technology(MOST)for Clean Utilization of Hydrocarbon Resources Xi’an 710069China

The ru/C catalyst prepared by impregnation method was used for hydrogenation of 3,5-dimethylpyridine in a trickle bed reactor.Under the same reduction conditions(300°C in H_(2)),the catalytic activity of the non-in-situ reduced ru/C-n catalyst was higher than that of the in-situ reduced ru/C-y catalyst.Therefore,an in-situ H_(2)reduction and moderate oxidation method was developed to increase the catalyst activity.Moreover,the influence of oxidation temperature on the developed method was investigated.The catalysts were characterized by Brunauer–Emmett–Teller method,hydrogen temperature programmed reduction H_(2)-TPR,hydrogen temperature-programmed dispersion(H_(2)-TPD),X-ray diffraction,energy dispersive spectroscopy,X-ray photoelectron spectroscopy,Raman spectroscopy,O2 chemisorption and oxygen temperature-programmed dispersion(O2-TPD)analyses.The results showed that there existed an optimal ru/ruO_(x)ratio for the catalyst,and the highest 3,5-dimethylpyridine conversion was obtained for the ru/C-i1 catalyst prepared by in-situ H_(2)reduction and moderate oxidation(oxidized at 100°C).Excessive oxidation(200°C)resulted in a significant decrease in the ru/ruO_(x)ratio of the in-situ H_(2)reduction and moderate oxidized ru/C-i2 catalyst,the interaction between ruO_(x)species and the support changed,and the hard-to-reduce ruO_(x)species was formed,leading to a significant decrease in catalyst activity.The developed in-situ H_(2)reduction and moderate oxidation method eliminated the step of the non-in-situ reduction of catalyst outside the trickle bed reactor.

关键词： ru C catalyst in-situ H_(2)reduction and moderate oxidation in-situ reduction non-in-situ reduction hydrogenation of 3,5-dimethylpyridine

Enhanced catalytic activity of ru through N modification toward alkaline hydrogen electrocatalysis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第2期33卷 1065-1069页

作者： Yuanmeng Zhao Xuewei Wang Zhen Li Pingping Zhao Congliang Tao Gongzhen Cheng Wei Luo College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China School of Printing and Packaging Wuhan UniversityWuhan 430072China Wuhan Foreign Language School Wuhan 430022China Suzhou Institute of Wuhan University Suzhou 215123China Yangzhou Kairuite Medical Products Co. Ltd.Yangzhou 225200China

Exploring highly efficient electrocatalysts and understanding the reaction mechanisms for hydrogen electrocatalysis,including hydrogen oxidation reaction (HOR) and hydrogen evolution reaction (HER) in alkaline media are conducive to the conversion of hydrogen energy.Herein,we reported a new strategy to boost the HER/HOR performances of ruthenium (ru) nanoparticles through nitrogen (N) modification.The obtained N-ru/C exhibit remarkable catalytic performance,with normalized HOR exchange current density and mass activity of 0.56 m A/cm^(2)and 0.54 m A/μg,respectively,about 4 and 4.5 times higher than those of ru/C,and even twofold enhancement compared to commercial Pt/C.Moreover,at the overpotential of 50 m V,the normalized HER current density of N-ru/C is 5.5 times higher than that of ru/C.Experimental and density functional theory (DFT) results verify the electronic regulation of ru after N incorporation,resulting in the optimized hydrogen adsorption Gibbs free energy (ΔG_(H*)) and hence enhancing the HOR/HER performance.

关键词： Hydrogen oxidation reaction Hydrogen evolution reaction ru N-incorporation DFT