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Modification of TiO_2 nanotubes arrays by CdS and their photoelectrocatalytic hydrogen generation properties

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Chinese Science Bulletin 2008年第12期53卷 1929-1932页

作者： zhang jianling zhang XingWang LEI LeCheng Institute of Environmental Pollution Control Technologies Xixi Campus Zhejiang University Hangzhou 310028 China

In order to realize hydrogen generation under visible light, novel CdS/TiO_2 nanotubes arrays are de- veloped by electrochemical anodization of Ti in 0.15 mol/L NH_4F + 0.08mol/L H_2C_2O_4 electrolyte. The diameter of the nanotube is 80―100nm and the length is approximately 550 nm. The CdS nano-particles are deposited on the TiO_2 nanotubes arrays by chemical bath deposition (CBD) in the ammonia-thiourea system. A 300W Xe lamp is used as the light source, CdS/TiO_2 nanotube arrays are used as the photoanode with the application of 1.0V bath voltage, and 0.1 mol/L Na_2S + 0.04 mol/L Na_2SO_3 solution is used as the electrolyte, then the rate of photoelectrocatalytic hydrogen generation is 245.4 μL/(h·cm^2). This opens new perspectives for photoelectrocatalytic hydrogen generation by using CdS/TiO_2 nanotubes arrays.

关键词：二氧化钛纳米材料制造方法装饰技术

Nitrogen-doping boosts ^(*)CO utilization and H_(2)O activation on copper for improving CO_(2) reduction to C_(2+) products

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Green Energy & Environment 2024年第9期9卷 1459-1465页

作者： Yisen Yang Zhonghao Tan jianling zhang Jie Yang Renjie zhang Sha Wang Yi Song Zhuizhui Su Beijing National Laboratory for Molecular Sciences CAS Laboratory of Colloid and Interface and ThermodynamicsCAS Research/Education Center for Excellence in Molecular SciencesCenter for Carbon Neutral ChemistryInstitute of ChemistryChinese Academy of SciencesBeijing100190China Key Laboratory of Photochemistry CAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing100190China

To improve the electrocatalytic transformation of carbon dioxide (CO_(2)) to multi-carbon (C_(2+)) products is of great *** we developed a nitrogen-doped Cu catalyst,by which the maximum C_(2+) Faradaic efficiency can reach 72.7%in flow-cell system,with the partial current density reaching 0.62 A cm^(-2).The in situ Raman spectra demonstrate that the *CO adsorption can be strengthened on such a N-doped Cu catalyst,thus promoting the *CO utilization in the subsequent C–C coupling ***,the water activation can be well enhanced by N doping on Cu *** to the synergistic effects,the selectivity and activity for C_(2+) products over the N-deoped Cu catalyst are much improved.

关键词： Electrocatalytic CO_(2)reduction reaction Copper catalyst Doping Multi-carbon products In situ Raman measurement

Ultra-small UiO-66-NH_(2)nanoparticles immobilized on g-C_(3)N_(4)nanosheets for enhanced catalytic activity

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Green Energy & Environment 2022年第3期7卷 512-518页

作者： Zhuizhui Su Bingxing zhang Xiuyan Cheng Fanyu zhang Qiang Wan Lifei Liu Xiuniang Tan Dongxing Tan Lirong Zheng jianling zhang Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Colloid and Interface and ThermodynamicsCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing100190China School of Chemical Sciences University of Chinese Academy of SciencesPhysical Science LaboratoryHuairou National ComprehensiveScience CenterBeijing100190China Beijing Synchrotron Radiation Facility(BSRF) Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China

UiO-66-NH_(2),an important metal-organic framework,is usually synthesized by solvothermal method and the particle size is generally larger than 200 nm,which limits its catalytic applications in chemical *** is very meaningful to produce UiO-66-NH_(2) nanoparticles with ultrasmall size,but remains ***,we synthesized UiO-66-NH_(2) nanoparticles in size of 8-15 nm that are immobilized on g-C_(3)N_(4)*** with the UiO-66-NH_(2) synthesized by the traditional solvothermal method(>200 nm),the ultra-small UiO-66-NH_(2) nanoparticles immobilized on g-C_(3)N_(4)have more unsaturated coordination positions and increased Lewis *** to these combined advantages,the ultra-small UiO-66-NH_(2)nanoparticles exhibit greatly improved catalytic activity for Meerwein-Ponndorf-Verley reaction than larger UiO-66-NH_(2)particles.

关键词： particles catalytic meaningful

Analysis of the factors affecting the magnetic characteristics of nano-Fe_3O_4 particles

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Chinese Science Bulletin 2011年第8期56卷 803-810页

作者： LI jianling LI DeCai zhang ShaoLan CUI HongChao WANG Cui School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing 100044 China

We prepared Fe3O4 nanoparticles using chemical coprecipitation and studied the factors affecting the magnetic characteristics of nano-Fe3O4 *** identified four factors and three levels of an orthogonal experiment and investigated these four factors that affect the magnetic characteristics of the Fe3O4 *** obtained important information from this *** Fe3+ to Fe2+ molar ratio,the iron precursor salt,the amount of surfactant and the amount of alkali were found to be *** also studied the influence of the order of alkali and surfactant addition,the aging time and the stirring speed on the magnetic characteristics of the nano-Fe3O4 *** Fe3O4 preparation process was also analyzed.

关键词： Fe3O4纳米粒子磁特性铁颗粒纳米Fe3O4 表面活性剂氧化磁性粒子化学共沉淀

Supercritical CO2 produces the visible-light-responsive TiO2/COF heterojunction with enhanced electron-hole separation for highperformance hydrogen evolution

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Nano Research 2020年第4期13卷 983-988页

作者： Lifei Liu jianling zhang Xiuniang Tan Bingxing zhang Jinbiao Shi Xiuyan Cheng Dongxing Tan Buxing Han Lirong Zheng Fanyu zhang Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of ColloidInterface and Chemical ThermodynamicsCASResearch/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China Physical Science Laboratory Huairou National Comprehensive Science CenterBeijing 101400China Beijing Synchrotron Radiation Facility(BSRF) Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

To construct the heterojunctions of TiO2 with other compounds is of great importance for overcoming its inherent shortages and improving the visible-light photocatalytic *** we propose the construction of TiO2/covalent organic framework(COF)heterojunction with tight connection by a supercritical CO2(SC CO2)method,which helps bridging the transformation paths for photo-induced charge between T i02 and *** produced T i02/COF heterojunction performs a H2 evolution of 3,962 nmol·g^-1·h^-1 under visible-light irradiation,which is-25 times higher than that of pure TiO2 and 4.5 folds higher than that of TiO2/COF synthesized by the conventional solvothermal *** study opens up new possibilities for constructing heterojunctions for solar energy utilization.

关键词： supercritical CO2 covalent organic fram ework(COF) TiO2 H2 production visible light

Ionic liquids produce heteroatom-doped Pt/TiO2 nanocrystals for efficient photocatalytic hydrogen production

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Nano Research 2019年第8期12卷 1967-1972页

作者： Xiuniang Tan jianling zhang Dongxing Tan Jinbiao Shi Xiuyan Cheng Fanyu zhang Lifei Liu Bingxing zhang Zhuizhui Su Buxing Han Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of ColloidInterface and Chemical ThermodynamicsCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China Physical Science Laboratory Huairou National Comprehensive Science CenterBeijing 101400China

It is of great importance to develop facile strategies to synthesize catalysts with desirable compositions and structures for high-performance photocatalytic hydrogen generation. In this work, we put forward an ionic liquid assisted one-pot route for the synthesis of heteroatom-doped Pt/TiO2 composite material. This route is simple, environmentally benign and adjustable owing to the designable properties of ionic liquids. The as-synthesized Pt/TiO2 nanocrystals exhibit high activity and stability for the photocatalytic hydrogen generation under simulated solar irradiation. This method can be easily applied to the synthesis of various kinds of metal/TiO2 composites doped with desirable heteroatoms (e.g., F, Cl, Br, etc).

关键词： ionic liquid titanium dioxide platinum heteroatom photocatalyst

Multi-shelled CuO microboxes for carbon dioxide reduction to ethylene

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Nano Research 2020年第3期13卷 768-774页

作者： Dongxing Tan jianling zhang Lei Yao Xiuniang Tan Xiuyan Cheng Qiang Wan Buxing Han Lirong Zheng Jing zhang Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of ColloidInterface and Chemical ThermodynamicsCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing100049China Physical Science Laboratory Huairou National Comprehensive Science CenterBeijing101400China Beijng Synchrotron Radiation Facility(BSRF) Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China

The electroreduction of CO2 to valuable chemicals and fuels offers an effective mean for energy *** CO2 has been efficiently converted into C1 products(e.g.,carbon monoxide,formic acid,methane and methanol),its convention into high value-added multicarbon hydrocarbons with high selectivity and activity still remains *** we demonstrate the formation of multi-shelled CuO microboxes for the efficient and selective electrocatalytic CO2 reduction to *** a structure favors the accessibility of catalytically active sites,improves adsorption of reaction intermediate(CO),inhibits the diffusion of produced OH−and promotes C-C coupling *** to these unique advantages,the multi-shelled CuO microboxes can effectively convert CO2 into C2H4 with a maximum faradaic efficiency of 51.3%in 0.1 M *** work provides an effective way to improve CO2 reduction efficiency via constructing micro-and nanostructures of electrocatalysts.

关键词： multi-shelled CuO microboxes nanocrystals CO2 reduction C2H4

Ferric acetylacetonate/covalent organic framework composite for high performance photocatalytic oxidation

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Green Energy & Environment 2022年第6期7卷 1281-1288页

作者： Mingzhao Xu Lifei Liu jianling zhang Fanyu zhang Gang Chen Qiang Wan Yufei Sha Xiuyan Cheng Zhuizhui Su Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Colloid and Interface and ThermodynamicsCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing100190China School of Chemistry and Chemical Engineering University of Chinese Academy of SciencesBeijing100049China School of Chemical Sciences University of Chinese Academy of SciencesPhysical Science LaboratoryHuairou National ComprehensiveScience CenterBeijing100190China

Ferric acetylacetonate/covalent organic framework(Fe(acac)_(3)/COF)composite was synthesized by interfacial polymerization method at room *** crystal structure,morphology and porosity property of the composite were characterized by X-ray diffraction,scanning electron microscope,transmission electron microscope and nitrogen *** interaction between Fe(acac)_(3) and COF was investigated by Fourier transform infrared spectra and X-ray photoelectron *** Fe(acac)_(3)/COF composite was used as a photocatalyst for the oxidation of benzyl alcohol under mild *** exhibits high activity and selectivity for the reaction,of which the mechanism was investigated by determining its photoelectric *** Fe(acac)_(3)/COF catalyst developed in this work has application potential in other photocatalytic reactions.

关键词： Covalent organic framework Photocatalysis Hybrid catalyst Benzyl alcohol oxidation Interfacial polymerization

Nitrogen-carbon layer coated nickel nanoparticles for efficient electrocatalytic reduction of carbon dioxide

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Nano Research 2019年第5期12卷 1167-1172页

作者： Dongxing Tan Chaonan Cui Jinbiao Shi Zhixun Luo Bingxing zhang Xiuniang Tan Buxing Han Lirong Zheng Jing zhang jianling zhang Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of ColloidInterface and Chemical ThermodynamicsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable SpeciesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China Beijing Synchrotron Radiation Facility(BSRF) Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

The application of nickel in electrocatalytic reduction of CO2 has been largely restricted by side reaction (hydrogen evolution reaction) and catalyst *** we report a new strategy to improve the electrocatalytic performance of nickel for CO2 reduction by employing a nitrogen-carbon layer for nickel *** a nickel electrocatalyst exhibits high Faradaic efficiency 97.5% at relatively low potential of-0.61 V for the conversion of CO2 to *** functional theory calculation reveals that it is thermodynamically accomplishable for the reduction product CO to be removed from the catalyst surface,thus avoiding catalyst ***,the catalyst renders hydrogen evolution reaction to be suppressed and hence reasonably improves catalytic performance.

关键词： CO2 reduction nickel nanoparticle nitrogen-carbon layer electrocatalytic activity desity functional theory (DFT) calculation