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Sub-2 nm IrO_(2)/Ir nanoclusters with compressive strain and metal vacancies boost water oxidation in acid

Nano Research 2023年第1期16卷 334-342页

作者： Zhijuan Liu Guangjin Wang Jinyu Guo Shuangyin wang Shuang-Quan Zang Henan Key Laboratory of Crystalline Molecular Functional Materials Henan International Joint Laboratory of Tumor Theranostical Cluster MaterialsGreen Catalysis Centerand College of ChemistryZhengzhou UniversityZhengzhou 450001China Hunan University State Key Laboratory of Chem/Bio-sensing and ChemometricsCollege of Chemistry and Chemical EngineeringChangsha 410082China School of Materials Science and Energy Engineering Foshan UniversityFoshan 528000China

IrO_(2)exhibits good stability but limited electrocatalytic activity for oxygen evolution reaction in acid.Defect engineering is an effective strategy to improve the intrinsic ability of electrocatalysts by tailoring their electronic structure.Herein,we have successfully synthesized IrO_(2)/Ir heterophase with compressive strain and metal vacancies via a simple substitution-etching method.In virtue of the solubility of Cr in strong alkali,metal vacancies could be formed at surface after etching Cr-doped IrO_(2)/Ir in alkali,which leaded to modulated electronic structure.Meanwhile,the substitution of Cr with smaller atom radius would induce the formation of compressive strain and the relocated atoms made the d-band center shifted.With the regulated electronic structure and tuned d-band center,the obtained electrocatalyst only needed 285 mV to reach 10 mA·cm^(−2)in 0.1 M HClO4.Reaction kinetic has been rapidly accelerated as indicated by the smaller Tafel slope and charge transfer resistance.Theoretical calculations revealed that the d-band center and charge density distribution have been regulated with the introduction of defects in IrO_(2)/Ir,which significantly decreased the free energy barrier of rate determining step.This work provides a valuable reference to design effective and defects-rich electrocatalysts.

关键词： IrO_(2)/Ir nanoclusters compressive strain metal vacancies d-band center water oxidation in acid

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Intelligent prediction of slope stability based on visual exploratory data analysis of 77 in situ cases

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International Journal of Mining Science and Technology 2023年第1期33卷 47-59页

作者： Guangjin Wang Bing Zhao Bisheng Wu Chao Zhang Wenlian Liu Faculty of Land Resources Engineering Kunming University of Science and TechnologyKunming 650093China Yunnan International Technology Transfer Center for Mineral Resources Development and Solid Waste Resource Utilization Kunming 650093China State Key Laboratory of Hydroscience and Engineering Department of Hydraulic EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China China Nonferrous Metals Industry Kunming Survey and Design Research Institute Co.Ltd Kunming 650051China

Slope stability prediction research is a complex non-linear system problem.In carrying out slope stability prediction work,it often encounters low accuracy of prediction models and blind data preprocessing.Based on 77 field cases,5 quantitative indicators are selected to improve the accuracy of prediction models for slope stability.These indicators include slope angle,slope height,internal friction angle,cohesion and unit weight of rock and soil.Potential data aggregation in the prediction of slope stability is analyzed and visualized based on Six-dimension reduction methods,namely principal components analysis(PCA),Kernel PCA,factor analysis(FA),independent component analysis(ICA),non-negative matrix factorization(NMF)and t-SNE(stochastic neighbor embedding).Combined with classic machine learning methods,7 prediction models for slope stability are established and their reliabilities are examined by random cross validation.Besides,the significance of each indicator in the prediction of slope stability is discussed using the coefficient of variation method.The research results show that dimension reduction is unnecessary for the data processing of prediction models established in this paper of slope stability.Random forest(RF),support vector machine(SVM)and k-nearest neighbour(KNN)achieve the best prediction accuracy,which is higher than 90%.The decision tree(DT)has better accuracy which is 86%.The most important factor influencing slope stability is slope height,while unit weight of rock and soil is the least significant.RF and SVM models have the best accuracy and superiority in slope stability prediction.The results provide a new approach toward slope stability prediction in geotechnical engineering.

关键词： Slope stability prediction Machine learning algorithm Dimensionality reduction visualization Random cross validation Coefficient of variation

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High-valance molybdenum doped Co_(3)O_(4) nanowires:Origin of the superior activity for 5-hydroxymethyl-furfural oxidation

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Chinese Chemical Letters 2023年第7期34卷 384-389页

作者： Bingying Xia Guangjin Wang Shasha Cui Jinyu Guo Hong Xu Zhijuan Liu Shuang-Quan Zang Henan Key Laboratory of Crystalline Molecular Functional Materials Henan International Joint Laboratory of Tumor Theranostical Cluster MaterialsGreen Catalysis Centerand College of ChemistryZhengzhouUniversityZhengzhou 450001China School of Materials Science and Energy Engineering Foshan UniversityFoshan 528000China

Co_(3)O_(4) has been widely explored in electrocatalytic 5-hydroxymethyl-furfural(HMF) oxidation. However,the poor intrinsic ability has seriously limited its electrochemical ability. Heteroatom-doping is an efficient method to enhance the electrocatalytic ability of catalyst by regulating electronic structure. Herein,we have modulated the electronic structure of Co_(3)O_(4) by high valance Mo^(6+)-doping. With the introduction of Mo^(6+), the content of Co^(2+) was increased and metal-oxygen bond was strength. Electrochemical results suggested that the electrocatalytic ability of Co_(3)O_(4) towards HMF oxidation has been dramatically improved and reaction kinetics has been fasten. Theoretical calculations demonstrated that the surrounding cobalt sites after Mo^(6+)-doping with assembled electron has a strong adsorption ability towards HMF molecule leading to more favourable oxidation of HMF. Post characterizations demonstrated pristine Co_(3)O_(4) structure was kept after electrolysis cycles and CoOOH active species were formed. This work provides a valuable reference for developing efficient heteroatom-doped electrocatalysts for HMF oxidation.

关键词： Spinel Co_(3)O_(4) High-valance Mo^(6+)-doping Electronic structure Adsorption ability 5-Hydroxymethyl-furfural oxidation

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Enhanced gas production and CO_(2) storage in hydrate-bearing sediments via pre-depressurization and rapid CO_(2) injection

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Chinese Journal of Chemical Engineering 2024年第3期67卷 126-134页

作者： Hongnan Chen Yifei Sun Bojian Cao Minglong wang Ming wang Jinrong Zhong Changyu Sun guangjin Chen State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China School of Chemistry and Chemical Engineering Changsha University of Science&TechnologyChangsha 410114China

Carbon emission reduction and clean energy development are urgent demands for mankind in the coming decades.Exploring an efficient CO_(2) storage method can significantly reduce CO_(2) emissions in the short term.In this study,we attempted to construct sediment samples with different residual CH_(4) hydrate amounts and reservoir conditions,and then investigate the potentials of both CO_(2) storage and enhanced CH_(4) recovery in depleted gas hydrate deposits in the permafrost and ocean zones,respectively.The results demonstrate that CO_(2) hydrate formation rate can be significantly improved due to the presence of residual hydrate seeds;However,excessive residual hydrates in turn lead to the decrease in CO_(2) storage efficiency.Affected by the T-P conditions of the reservoir,the storage amount of liquid CO_(2) can reach 8 times that of gaseous CO_(2),and CO_(2) stored in hydrate form reaches 2-4 times.Additionally,we noticed two other advantages of this method.One is that CO_(2) injection can enhance CH_(4) recovery rate and increases CH_(4) recovery by 10%-20%.The second is that hydrate saturation in the reservoir can be restored to 20%-40%,which means that the solid volume of the reservoir avoids serious shrinkage.Obviously,this is crucial for protecting the goaf stability.In summary,this approach is greatly promising for high-efficient CO_(2) storage and safe exploitation of gas hydrate.

关键词： Hydrate Depressurization CO_(2) storage CH_(4) production Reservoir remediation

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Facile fabrication of cordierite-based porous ceramics with magnetic properties

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Journal of Advanced Ceramics 2022年第10期11卷 1583-1595页

作者： Hao LI Cuiwei LI Huaiming JIA guangjin CHEN Siyuan LI Kepi CHEN Chang-An wang Liang QIAO Center of Materials Science and Engineering School of MechanicalElectronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China

In this paper,cordierite-based porous ceramics with magnetic properties have been firstly in-situ synthesized by using MgO,Al_(2)O_(3),and SiO_(2) powders as raw materials and Fe_(3)O_(4) as a functional additive.Combining with the foam freeze casting method,near net size fabrication(total linear shrinkage<2.86%)of the magnetic porous materials was realized by adjusting the amount of Fe_(3)O_(4).The porosity,compressive strength,and saturation magnetization of the prepared materials were 83.9%-87.8%,1.51-2.65 MPa,and 1.2-5.8 emu/g,respectively.The phase composition and microstructure evolutions during sintering were investigated briefly.The results showed that the synthesis temperature of cordierite was lowered about 100℃ due to the addition of Fe_(3)O_(4).Except for the main phase-cordierite,Mg-Al-Fe spinel and α-Fe_(2)O_(3) also existed in the final materials.The lattice parameters of the Mg-Al-Fe spinel and the amount of α-Fe_(2)O_(3) changed obviously with the change in the sintering temperature and Fe_(3)O_(4) amount,which mainly influenced the magnetic properties of the prepared materials.Thus,a facile fabrication method of the cordierite-based porous ceramics with the magnetic properties has been put forward in this paper.

关键词： porous cordierite ceramics phase composition microstructure magnetic property

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Nanocomposite Membranes based on Perfl uorosulfonic Acid/Ceramic for Proton Exchange Membrane Fuel Cells

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Journal of Wuhan University of Technology(Materials Science) 2015年第6期30卷 1125-1129页

作者：李琼 wang guangjin YE Hong YAN Shilin School of Science Wuhan University of Technology School of Materials Science and Engineering Wuhan Textile University College of Chemistry and Materials Science Hubei Engineering University School of Transportation Engineering Wuhan Technical College of Communications

Perfl uorosulfonic acid/ceramic nanocomposite membranes were investigated as electrolytes for polymer electrolyte membrane fuel cell applications under low relative humidity. Different nanosized ceramics（SiO2, ZrO2, TiO2） with diameters in the range of 2-6 nm were synthesized in situ in Nafion solution through a sol-gel process and the formed nanosized ceramics were well-dispersed in the solution.The nanocomposite membranes were formed through a casting process. The nanocomposite membrane showes enhanced water retention ability and improved proton conductivity compared to those of pure Nafi on membrane. The mechanical strength of the formed nanocomposite membranes is slightly less than that of pure Nafi on membrane. The experimental results demonstrate that the polymer ceramic nanocompsite membranes are potential electrolyte for fuel cells operating at elevated temperature.

关键词： proton exchange membrane ceramic sol-gel process ionic conductivity

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Rate-limiting factors in hydrate decomposition through depressurization across various scales:A mini-review

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Chinese Journal of Chemical Engineering 2024年第3期67卷 206-219页

作者： Xian Sun Peng Xiao Qinfeng Shi Lingban wang Zhenbin Xu Yuhao Bu Xiaohui wang Yifei Sun Changyu Sun guangjin Chen State Key Laboratory of Heavy Oil Processing China University of Petroleum(Beijing)Beijing 102249China Jining University Jining 273115China

Natural gas hydrate is an energy resource for methane that has a carbon quantity twice more than all traditional fossil fuels combined.However,their practical application in the field has been limited due to the challenges of long-term preparation,high costs and associated risks.Experimental studies,on the other hand,offer a safe and cost-effective means of exploring the mechanisms of hydrate dissociation and optimizing exploitation conditions.Gas hydrate decomposition is a complicated process along with intrinsic kinetics,mass transfer and heat transfer,which are the influencing factors for hydrate decomposition rate.The identification of the rate-limiting factor for hydrate dissociation during depressurization varies with the scale of the reservoir,making it challenging to extrapolate findings from laboratory experiments to the actual exploitation.This review aims to summarize current knowledge of investigations on hydrate decomposition on the subject of the research scale(core scale,middle scale,large scale and field tests)and to analyze determining factors for decomposition rate,considering the various research scales and their associated influencing factors.

关键词： Gas hydrate Rate-limiting factors Research scale Depressurization Decomposition

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Rambutan-like hollow carbon spheres decorated with vacancy-rich nickel oxide for energy conversion and storage

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Carbon Energy 2020年第1期2卷 122-130页

作者： Zixu Sun Xinghui wang Hu Zhao See W.Koh Junyu Ge Yunxing Zhao Pingqi Gao Guangjin Wang Hong Li School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingaporeSingapore College of Physics and Information Engineering Institute of Micro-Nano Devices and Solar CellsFuzhou UniversityFuzhouChina Ningbo Institute of Material Technology and Engineering Chinese Academy of SciencesNingboChina School of Materials Science and Energy Engineering Foshan UniversityFoshanChina Centre for Micro-/Nano-electronics(NOVITAS) School of Electrical and Electronic EngineeringNanyang Technological UniversitySingaporeSingapore CINTRA CNRS/NTU/THALES UMI 3288SingaporeSingapore

Transition metal oxides hold great promise for lithium-ion batteries(LIBs)and electrocatalytic water splitting because of their high abundance and high energy density.However,designing and fabrication of efficient,stable,high power density electrode materials are challenging.Herein,we report rambutan-like hollow carbon spheres formed by carbon nanosheet decorated with nickel oxide(NiO)rich inmetal vacancies(denoted as h-NiO/C)as a bifunctional electrode material for LIBs and electrocatalytic oxygen evolution reaction(OER).When being used as the anode of LIBs,the h-NiO/C electrode shows a large initial capacity of 885mAh g−1,a robust stability with a high capacity of 817mAh g−1 after 400 cycles,and great rate capability with a high reversible capacity of 523mAh g−1 at 10Ag−1 after 600 cycles.Moreover,working as an OER electrocatalyst,the h-NiO/C electrode shows a small overpotential of 260mV at 10mAcm−2,a Tafel slope of 37.6mVdec−1 along with good stability.Our work offers a cost-effective method for the fabrication of efficient electrode for LIBs and OER.

关键词： bifunctional materials hollow sphere NiO/C nanoparticles oxygen vacancies rambutan-like structure

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Woven fabric triboelectric nanogenerators for human-computer interaction and physical health monitoring

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Nano Research 2024年第6期17卷 5540-5548页

作者： Yu Miao Mengjuan Zhou Jia Yi Yanyan wang guangjin Tian Hongxia Zhang Wenlong Huang Wenhao wang Ronghui Wu Liyun Ma College of Textile and Clothing Xinjiang UniversityUrumqi 830046China College of Textiles Donghua UniversityShanghai 201620China College of Physics Xiamen UniversityXiamen 201620China Department of Bioengineering Imperial College LondonLondon SW72AZUK

Triboelectric nanogenerator(TENG)converts mechanical energy into valuable electrical energy,offering a solution for future energy needs.As an indispensable part of TENG,textile TENG(T-TENG)has incredible advantages in harvesting biomechanical energy and physiological signal monitoring.However,the application of T-TENG is restricted,partly because the fabric structure parameter and structure on T-TENG performance have not been fully exploited.This study comprehensively investigates the effect of weaving structure on fabric TENGs(F-TENGs)for direct-weaving yarn TENGs and post-coating fabric TENGs.For direct-weaving F-TENGs,a single-yarn TENG(Y-TENG)with a core-sheath structure is fabricated using conductive yarn as the core layer yarn and polytetrafluoroethylene(PTFE)filaments as the sheath yarn.Twelve fabrics with five different sets of parameters were designed and investigated.For post-coating F-TENGs,fabrics with weaving structures of plain,twill,satin,and reinforced twill were fabricated and coated with conductive silver paint.Overall,the twill F-TENGs have the best electrical outputs,followed by the satin F-TENGs and plain weave F-TENGs.Besides,the increase of the Y-TENG gap spacing was demonstrated to improve the electrical output performance.Moreover,T-TENGs are demonstrated for human-computer interaction and self-powered real-time monitoring.This systematic work provides guidance for the future T-TENG’s design.

关键词： single-yarn triboelectric nanogenerators woven fabric triboelectric nanogenerators fabric weaving structures and parameters human-computer interaction physical health monitoring

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Oxygen and hydrogen peroxide self-supplying magnetic nanoenzymes for cancer therapy through magneto-mechanical force,force-induced reactive oxygen species,chemodynamic effects,and cytotoxicity of Ca^(2+) ions

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Nano Research 2023年第5期16卷 7134-7147页

作者： Jie Liu Wenxuan Yang Yuqiao Huang Ji Li Chunjiao Zhu guangjin Pu Bo wang Xin Gui Maoquan Chu Research Center for Translational Medicine at Shanghai East Hospital School of Life Sciences and TechnologyTongji UniversityShanghai 200092China Institute of Biophysics Chinese Academy of SciencesBeijing 100101China College of Life Sciences University of Chinese Academy of SciencesBeijing 100049China

The use of magneto-mechanical force to kill cancer cells has attracted significant attention in recent years.However,many reports have focused on in vitro experiments with a single treatment.Herein,CaO_(2)-coated Fe_(3)O_(4)core–shell magnetic nanoenzymes(Fe_(3)O_(4)/CaO_(2))are developed for low frequency vibrating magnetic field(VMF)-induced multimodal cancer therapy.Fe_(3)O_(4)/CaO_(2)are shown to efficiently generate O_(2),H_(2)O_(2),·OH through hydrolysis of CaO_(2)and a CaO_(2)-strengthened Fenton reaction,killing laryngeal carcinoma cells and inhibiting mouse tumor growth(chemodynamic therapy(CDT)).Both Fe_(3)O_(4)and Fe_(3)O_(4)/CaO_(2)triggered by a VMF are shown to damage the cytoskeleton of cancer cells through magneto-mechanical force(maxima:223 piconewtons or larger by Fe_(3)O_(4)/CaO_(2)aggregations)and induce the generation of intracellular reactive oxygen species(ROS),the VMF-triggered Fe_(3)O_(4)/CaO_(2)is shown to generate additional intracellular ROS.Upon exposure to a VMF,the cell killing efficiency and tumor growth inhibition were further significantly improved by Fe_(3)O_(4)/CaO_(2)through CDT,magnetomechanical force,force-induced ROS,the cytotoxicity of Ca^(2+)ions.In addition,the Fe_(3)O_(4)/CaO_(2)nanoenzymes and VMFinduced treatment are shown to be safe for mice.The results of this study open the door for treating solid tumors without inducing multidrug resistance through the combination of CDT and force.

关键词： CaO_(2)-coated Fe_(3)O_(4)nanoenzymes magneto-mechanical force reactive oxygen species chemodynamic effect cancer therapy

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