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Promoting electrocatalytic alcohols oxidation coupled with H_(2) production via ligand intercalation strategy

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Nano Research 2023年第4期16卷 4596-4602页

作者： Li Li Zhiyuan Zhang Haotong Chen Fei Chen College of New Materials and Chemical Engineering Beijing Key Lab of Special Elastomeric Composite MaterialsBeijing Institute of Petrochemical TechnologyBeijing 102617China

Electrochemical alcohol oxidation,the alternate of oxygen evolution reaction,has been recognized as an effective way to produce value-added chemicals coupled with H2 ***,the current researches still suffer from the low reaction rate and Faradaic efficiency(FE)that limits the overall ***,we report a ligand intercalation strategy to enhance the current density of alcohol electrooxidation by intercalating sodium dodecyl sulfonate(SDS)in the interlayer of Co(OH)_(2)catalyst(Co(OH)_(2)-SDS).For instance,the Co(OH)_(2)-SDS shows obviously enhanced current density for glycerol electrooxidation than that of pure Co(OH)_(2).The corresponding glycerol conversion rate and H2 production rate reach 0.35 mmol·cm^(−2)·h^(−1)and 9.1 mL·cm^(−2)·h^(−1)at 1.42 V *** hydrogen electrode,which are 2.2-and 1.9-fold higher than that of Co(OH)_(2).The yield of formate reaches 86.6%with selectivity of 95.3%at high glycerol conversion of 95.1%(with FE of 83.3%for glycerol oxidation).The Co(OH)_(2)-SDS is demonstrated efficient for different alcohols with enhanced *** confirmed that the intercalation of SDS in Co(OH)_(2)can promote the generation and exposure of CoOOH reactive sites,and also facilitate the adsorption of alcohol,thus enabling high reaction rate.

关键词： electrocatalysis alcohol oxidation hydrogen cobalt hydroxide ligand intercalation

InGaAsP/InP Double Quantum Well Intermixing Induced by Phosphorus Ion Implantation

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Semiconductor Photonics and Technology 2005年第4期11卷 217-220页

作者： CHEN Jie ZHAO Jie WANG Yong-chen HAN De-jun College of Phys. and Electron. Inform. Sci. Tianjin Normal University Tianjin 300074 CHN The key lab. of education ministry on Radiation Beam and Materials Modification Beijing Normal University Beijing 100875 CHN

A quantum well intermixing（QW1） investigation on double quantum well（DQW） structure with two different emitting wavelength caused by phosphorus ion implantation and following rapid thermal annealing （RTA） was carried out by means of photoluminescence（PL）. The ion implantation was performed at the energy of 120 keV with the dose ranging from 1 × 10^11cm^-2 to 1× 10^14cm^-2. The RTA was performed at the temperature of 700 ℃ for 30 s under pure nitrogen protection. The PL measurement implied that the band gap blue-shift from the upper well increases with the ion dose faster than that from lower well and the PL peaks from both QWs remained well separated under the lower dose implantation（-1 × 10^11cm^-2） indicating that the implant vacancy distribution affects the QWl. When the ion dose is over - 1 × 10^12cm^-2, the band gap blue-shift from both wells increases with the ion dose and finally the two peaks merge together as one peak indicating the ion implantation caused a total intermixing of both quantum wells.

关键词： Ion implantation l InGaAsP/InP DOuble quantum well(DQW) Quantum well intermixing

2D/2D atomic double-layer WS_(2)/Nb_(2)O_(5)shell/core nanosheets with ultrafast interfacial charge transfer for boosting photocatalytic H_(2)evolution

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Chinese Chemical Letters 2021年第10期32卷 3128-3132页

作者： Bo Lin Hao Chen Yao Zhou Xiao Luo Dan Tian Xiaoqing Yan Ruihuan Duan Jun Di Lixing Kang Aimin Zhou Guidong Yang Yonghui Li Jiadong Zhou Zheng Liu Fucai Liu School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Wuhan Second Ship Design and Research Institute Wuhan 430200China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore College of Materials Science and Engineering Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesNanjing Forestry UniversityNanjing 210037China XJTU-Oxford International Joint laboratory for Catalysis School of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi’an 710049China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Department of Physics and Tianjin key laboratory of Low Dimensional Materials Physics and Preparing Technology School of ScienceTianjin UniversityTianjin 300350China key lab of Advanced Optoelectronic Quantum Architecture and Measurement(ministry of education) Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systemsand School of PhysicsBeijing Institute of TechnologyBeijing 100081China

Low-efficiency charge transfer is a critical factor to limit the photocatalytic H_(2)evolution activity of semiconductor *** interface design is a promising approach to achieve high chargetransfer efficiency for ***,a new 2 D/2 D atomic double-layer WS_(2)/Nb_(2)O_(5)shell/core photocatalyst(DLWS/Nb_(2)O_(5))is *** atom-resolved HAADF-STEM results unravel the presence of an unusual 2 D/2 D shell/core interface in DLWS/Nb_(2)O_(5).Taking advantage of the advanced femtosecond-resolved ultrafast TAS spectra,the average lifetime of charge carriers for DLWS/Nb_(2)O_(5)(180.97 ps)is considerably shortened as compared to that of Nb_(2)O_(5)(230.50 ps),strongly indicating that the 2 D/2 D shell/core interface enables DLWS/Nb_(2)O_(5)to achieve ultrafast charge transfer from Nb_(2)O_(5)to atomic double-layer WS_(2),thus yielding a high photocatalytic H_(2)evolution rate of 237.6 mmol/h,up to10.8 times higher than that of pure Nb_(2)O_(5)*** study will open a new window for the development of high-efficient photocatalytic systems through the interface design.

关键词： 2D/2D shell/core interface Atomic double-layer WS_(2) Nb_(2)O_(5)nanosheet Charge transfer Photocatalytic H_(2)evolution

Multiplicity of closed geodesics on Finsler spheres with irrationally elliptic closed geodesics

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Science China mathematics 2016年第3期59卷 531-538页

作者： DUAN Hua Gui LIU Hui School of Mathematical Sciences and LPMC Nankai University Tianjin 300071 China key laboratory of Wu Wen-Tsun mathematics Chinese Academy of SciencesSchool of Mathematical Sciences University of Science and Technology of China Hefei 230026 China

If all prime closed geodesics on(S^n, F) with an irreversible Finsler metric F are irrationally elliptic,there exist either exactly 2 [(n+1)/2] or infinitely many distinct closed geodesics. As an application, we show the existence of three distinct closed geodesics on bumpy Finsler(S^3, F) if any prime closed geodesic has non-zero Morse index.

关键词： closed geodesics multiplicity bumpy Finsler spheres irrationally elliptic

A Crystal Plasticity Model with Irradiation Effect for the Mechanical Behavior of FCC Metals

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Acta Mechanica Solida Sinica 2019年第6期32卷 675-687页

作者： Jnnfeng Nie Yunpeng Liu Pandong Lin Qihao Xie Zhanli Liu Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyKey Laboratory of Advanced Reactor Engineering and Safety of Minis try of EducationTsinghua UniversityBeijing 100084China Applied Mechanics lab. School of Aerospace EngineeringTsinghua UniversityBeijing 100084China Data Science and Information Technology Research Center Tsinghua-Berkeley Shenzhen InstituteShenzhen 518055China

In this paper,a crystal plasticity model considering the irradiation effect based on the thermal activation theory is *** evolutions of screw dislocations,edge dislocations,and stacking fault tetrahedrals(SFTs)(induced by irradiation)are included into the *** interactions between dislocations and irradiation-induced SFTs are also *** constitutive model is numerically implemented on the ABAQUS platform through UMAT subroutine and applied to study the irradiation effect on the mechanical behavior of pure *** mechanical properties of single and polycrystalline copper are studied,and the simulation results show that the constitutive model can properly predict the mechanical behavior of irradiated pure *** for polycrystalline copper,the simulation results are in good agreement with the experimental data.

关键词： Crystal plasticity Irradiation effect Uniaxial tension Dislocation FCC crystal

具有自适应机械弹性的纳米纤维互锁多孔石墨烯复合气凝胶用于高度可逆的无枝晶锂金属负极

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中国科学:材料科学(英文版) 2023年第8期66卷 3065-3074页

作者：冯之欣莫璐璐陈开钱雨姗张镭骞杨升元 Roohollah Bagherzadeh 赖飞立樊玮张超缪月娥刘天西 State key laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua UniversityShanghai 201620China key laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China Advanced Fibrous Materials lab Institute for Advanced Textile Materials and Technologies(ATMT)School of Advanced Materials and ProcessesAmirkabir University of TechnologyTehranIran Department of Chemistry KU LeuvenCelestijnenlaan 200FLeuven 3001Belgium

具有最高理论容量的锂金属被认为是下一代高能量密度电池中最有前景的负极,但长循环过程中的锂枝晶生长和负极的体积膨胀阻碍着其实际应用.尽管已有研究使用石墨烯气凝胶等三维主体用于容纳锂金属,但单一的石墨烯气凝胶难以承受充放电... 详细信息

具有最高理论容量的锂金属被认为是下一代高能量密度电池中最有前景的负极,但长循环过程中的锂枝晶生长和负极的体积膨胀阻碍着其实际应用.尽管已有研究使用石墨烯气凝胶等三维主体用于容纳锂金属,但单一的石墨烯气凝胶难以承受充放电过程中负极的大体积变化.因此,本文制备了具有自适应机械弹性的聚酰亚胺纳米纤维互锁多孔石墨烯复合气凝胶(PI-HGCA),将其作为复合主体结构用于容纳锂金属.具有面内纳米孔的多孔石墨烯纳米片可以有效地调节锂离子通量并提供高度定向的离子转移路径.此外,三维复合气凝胶主体由水平排列的多孔石墨烯片层和互锁的聚酰亚胺纳米纤维构成,其在长期循环过程中对负极的体积变化表现出高度可逆的自适应压缩弹性.预锂化的PI-HGCA负极在对称电池中显示出极低的过电势(46 mV),并具有1300次的长循环寿命;其与LiFePO_(4)正极所组装而成的全电池在1 C下经过800次循环后仍然显示出81.2%的超高容量保持率,表明该互锁气凝胶复合结构在高能量密度锂金属电池中具有巨大应用潜力.

关键词：长循环寿命水平排列理论容量复合气凝胶高能量密度石墨烯纳米片聚酰亚胺复合结构

Copper-based oxygen carriers supported with alumina/lime for the chemical looping conversion of gaseous fuels

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Journal of Energy Chemistry 2017年第5期26卷 891-901页

作者： Syed K Haider María Erans Felix Donat Lunbo Duan Stuart A Scott Vasilije Manovic Edward J Anthony Combustion and CCS Centre Cranfield UniversityBedfordshire MK43 0ALUK key laboratory of Energy Thermal Conversion and Control Ministry of EducationSchool of Energy and EnvironmentSoutheast UniversityNanjing 210096JiangsuChina Department of Engineering University of CambridgeTrumpington StreetCambridgeUK

Copper（Ⅱ） oxide in varying ratios was combined with either an alumina-based cement（Al300）, or CaO derived from limestone as support material in a mechanical pelletiser. This production method was used to investigate its influence on possible mechanical and chemical improvements for oxygen carriers in chemical looping processes. These materials were tested in a lab-scale fluidised bed with CO or CH;as a reducing gas at 950 °C. As expected, the oxygen carriers containing a greater ratio of support material exhibited an enhanced crushing strength. Oxygen carriers comprised of a 1:3 ratio of support material to active CuO exhibited increased crushing strength by a minimum of 280% compared to pure CuO *** oxygen carriers exhibited a high CO conversion yield and were fully reducible from CuO to Cu. For the initial redox cycle, Al300-supported oxygen carriers showed the highest fuel and oxygen carrier conversion. The general trend observed was a decline in conversion with an increasing number of redox *** the case of CaO-supported oxygen carriers, all but one of the oxygen carriers suffered *** agglomeration was more severe in carriers with higher ratios of CuO. Oxygen carrier Cu25Al75（75 wt% aluminate cement and 25 wt% CuO）, which did not suffer from agglomeration, showed the highest attrition with a loss of approximately 8% of its initial mass over 25 redox cycles. The reducibility of the oxygen carriers was limited with CH;in comparison to CO. CH;conversion were 15%-25% and 50% for Cu25Ca75（25 wt% CuO and 75 wt% CaO） and Cu25Al75, respectively. Cu25Ca75 demonstrated improved conversion, whereas Cu25Al75 exhibited a trending decrease in conversion with increasing redox cycles.

关键词： Chemical-looping Oxygen carrier Copper Carbon capture

Pr-doped ln203 nanocubes induce oxygen vacancies for enhancing triethylamine gas-sensing performance

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Frontiers of Materials Science 2019年第2期13卷 174-185页

作者： Chao WANG Wu WANG Ke HE Shantang LIU School of Chemistry and Environmental Engineering Key Laboratory for Green Chemical Process (Ministry of Education) Hubei Key Lab of Novel Reactor & Green Chemical Technology Wuhan Institute of Technology Wuhan 430073 China

Nanocubes derived from pure In2O3 and xPr-In2O3 (x= 1, 2, 3 and 5 mol.%) were synthesized using a facile hydrothermal method, followed by calcination. The morphological and structural characterization demonstrated that as-synthesized samples presented regular cubes that decreased in size with the increase of the Pr doping. The data showed that the sensing performances of sensors based on In203 were notably improved after the Pr doping. Among them, the sensor based on 2 mol.% Pr-In2O3 had the best sensing performance towards the triethylamine (TEA) gas, including a high response (RaIRg = 260 to 100 ppm TEA gas, which is about 12 times higher than that of the sensor based on pure In2O3), a short response time (2s), and a low detection limit (0.2 ppm) at 350℃. The mechanism responsible for the enhancement of sensing performance was attributed to the improvement of the vacancy content of 2 mol.% Pr-ln203, which promoted the oxidation—reduction reaction with the TEA gas that occurred on the materials surface.

关键词： gas sensor Pr-dope In2O3 triethylamine oxygen vacancy

Thiocyanate Oxidation by Coculture from a Coke Wastewater Treatment Plant

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Journal of Biomaterials and Nanobiotechnology 2013年第2期4卷 37-46页

作者： Huijing Huang Chunhua Feng Xiaxia Pan Haizhen Wu Yuan Ren Chaofei Wu Chaohai Wei College of Bioscience and Bioengineering South China University of Technology Guangzhou China Jingtian Environmental Protection Technology Co. Ltd. Guangzhou China The key lab of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of Education College of Environment and Energy South China University of Technology Guangzhou China

Bacterial strains in an activated sludge aerobic reactor from a coke wastewater were found to be able to utilize thiocyanate as carbon source when the thiocyanate-containing wastewater was deprived of carbon source. This study showed that three thiocyanate-oxidizing bacterial strains, Burkholderia sp., Chryseobacterium sp., and Ralstonia sp. were isolated from the activated sludge of a coke wastewater treatment plant as evidenced by the fact that complete decomposition of thiocyanate was achieved either by coculture or individual pure culture. The thiocyanate biodegradation by the coculture occurred with an optimal pH range between 6.5 and 8.5 and an optimal temperature range between 30°C and 40°C. The biodegradation kinetics of thiocyanate was well fitted with the Andrew-Haldane model, which demonstrated a distinct substrate concentration-inhibited bacterial growth pattern. The effects of different types of additional carbon, nitrogen or sulfur sources on thiocyanate biodegradation were also investigated. Analysis of the end-products indicated that thiocyanate degradation by these strains should proceed via two pathways.

关键词： Thiocyanate Biodegradation Carbon Source Coke Wastewater Biokinetics Andrew-Haldane Model