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Efficient and stable PtFe alloy catalyst for electrocatalytic methanol oxidation with high resistance to cO

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Journal of Energy chemistry 2024年第3期90卷 327-336,I0008页

作者： qian Yang Sifan Zhang fengshun Wu Lihua Zhu guang Li Mingzhi chen An Pei Yingliang feng Jiangxi Provincial Key Laboratory of Functional Molecular Materials chemistry College of Chemistry and Chemical EngineeringFaculty of Materials Metallurgy and ChemistryJiangxi University of Science and TechnologyGanzhou 341000JiangxiChina college of chemistry and chemical Engineering Xiamen UniversityXiamen 361005FujianChina

Direct methanol fuel cells(DMFc) are widely considered to be an ideal green energy conversion device but their widespread applications are limited by the high price of the Pt-based catalysts and the instability in terms of surface cO toxicity in long-term ***,the PtFe alloy nanoparticles(NPs) with small particle size(~4.12 nm) supported on carbon black catalysts with different Pt/Fe atomic ratios(Pt_(1)Fe_(2)/c,Pt_(3)Fe_(4)/c,Pt_(1)Fe_(1)/c,and Pt_(2)Fe_(1)/c) are successfully prepared for enhanced anti-cO poisoning during methanol oxidation reaction(MOR).The optimal atomic ratio of Pt/Fe for the MOR is 1:2,and the mass activity of Pt_(1)Fe_(2)/c(5.40 A mg_(Pt)^(-1)) is 13.5 times higher than that of conventional commercial Pt/c(Pt/c-JM)(0.40 A mg_(Pt)^(-1)).The introduction of Fe into the Pt lattice forms the PtFe alloy phase,and the electron density of Pt is reduced after forming the PtFe ***-situ Fourier transform infrared results indicate that the addition of oxyphilic metal Fe has reduced the adsorption of reactant molecules on Pt during the *** doping of Fe atoms helps to desorb toxic intermediates and regenerate Pt active sites,promoting the cleavage of c-O bonds with good selectivity of cO_(2)(58.1%).Moreover,the Pt_(1)Fe_(2)/c catalyst exhibits higher cO tolerance,methanol electrooxidation activity,and long-term stability than other Pt_(x)Fe_(y)/c catalysts.

关键词： Alloy catalyst PtFe Methanol oxidation In-situ FTIR cO resistance

Uncovering Microstructure-Property Relationship in Ni-Alloyed Fe-Mn-Al-c Low-Density Steel Treated by Hot-Rolling and Air-cooling Process

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Acta Metallurgica Sinica(English Letters) 2024年第4期37卷 713-725页

作者： Xiaoliang Jia guhui gao Xiaolu gui chun feng R.D.K.Misra Bingzhe Bai School of Mechanical Electronicand Control EngineeringBeijing Jiaotong UniversityBeijing100044China cNPc Tubular goods Research Institute Xi’an710077China Laboratory for Excellence in Advanced Steel Research University of Texas at El PasoEl PasoTX79968-0521USA School of Material Science and Engineering Key Laboratory of Advanced Materials of Ministry of EducationTsinghua UniversityBeijing100084China

This paper focuses on the relationship between the microstructure and tensile properties of Fe-Mn-Al-c low-density high-strength steel processes by hot-rolling and air-cooling process. The microstructure analysis reveals that the combination of hot-rolling and air-cooling results in the formation of heterogeneous structures comprising different-sized γ and B_(2) phases in the low-density steel with the addition of nickel (Ni). The addition of Ni promotes the formation of the B_(2) phase and induces the pinning of B_(2) phase particles at the γ grain boundaries. This pinning effect effectively hinders the growth of the γ grains, leading to grain refinement. The tensile test results demonstrate that LDS-5Ni (low-density steel, LDS) exhibits excellent high strength and ductility combination, e.g., a tensile strength of 1535 MPa, yield strength of 1482 MPa, and elongation of 23.3%. These remarkable mechanical properties are primarily attributed to the combined strengthening contributions of grain refinement and duplex nano-sized second-phase precipitation hardening.

关键词： Low-density steel Microstructure B_(2)phase κ-carbide Tensile properties

Enhanced bioethanol production from sugarcane bagasse:combination of liquid hot water and deep eutectic solvent pretreatment for optimized enzymatic saccharification

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Frontiers of chemical Science and Engineering 2024年第8期18卷 1-13页

作者： Xiaoling Xian Biying Li Shiyong feng Jiale Huang Xinyuan Fu Ting Wu Xiaoqing Lin School of chemical Engineering and Light Industry Guangdong Provincial Key Laboratory of Plant Resources BiorefineryGuangdong University of TechnologyGuangzhou 510006China

In the present study,a sustainable pretreatment methodology combining liquid hot water and deep eutectic solvent is proposed for the efficient fractionation of hemicellulose,cellulose,and lignin from sugarcane bagasse,thereby facilitating the comprehensive utilization of both c5 and c6 *** application of this combined pretreatment strategy to sugarcane bagasse led to notable enhancements in enzymatic saccharification and subsequent *** results demonstrate that liquid hot water-deep eutectic solvent pretreatment yielded 85.05±0.66 g·L^(-1)of total fermentable sugar(glucose:60.96±0.21 g·L^(-1),xylose:24.09±0.87 g·L^(-1))through enzymatic saccharification of sugarcane ***,fermentation of the pretreated sugarcane bagasse hydrolysate yielded 34.33±3.15 g·L^(-1)of *** findings confirm the effectiveness of liquid hot water-deep eutectic solvent pretreatment in separating lignocellulosic components,thus presenting a sustainable and promising pretreatment method for maximizing the valuable utilization of biomass resources.

关键词： sugar cane bagasse synergistic pretreatment enzymatic saccharification ethanol

Facile formation of hierarchical magnesium silicate hydrate microspheres as an adsorbent for the textile dyes

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PARTIcUOLOgY 2024年第10期93卷 99-110页

作者： Kyawoo, Tin Karim, Naveed Jiang, chao Ahmed, Saeed Tian, Weiliang Li, Huiyu feng, Yongjun Beijing Univ chem Technol Beijing Engn Ctr Hierarch Catalysts State Key Lab Chem Resource Engn Beijing 100029 Peoples R China Univ chakwal Dept Chem Chakwal 48800 Pakistan Tarim Univ Coll Chem & Chem Engn Alar 843300 Peoples R China

Hierarchical porous magnesium silicate hydrate (MSH) microspheres composed of sheets are successfully developed under facile conditions using a hard template. The role of hexadecyltrimethylammonium bromide (cTAB) on the formation and adsorption behavior was also observed for the methyl orange and methylene blue. The formed MSH possesses a surface area of 453.24 m 2 /g, an average pore size of 6.38 nm, and a pore volume of 0.75 cm 3 /g without cTAB. Based on the role of cTAB and the change in the ratio of Mg/Si, the MSH retained its sphere-like structure with a variation in pore parameters. The formed MSH was used as an adsorbent to remove methylene blue and methyl orange. The pseudo-second-order kinetic and Langmuir Isotherm models are well- fitted, with a 256.4 mg/g removal capacity and 84.2 mg/g for methylene blue and methyl orange, respectively. The modi fied MSH with cTAB played a positive role for the methyl orange and a negative role for the methylene blue regarding removal performance. (c) 2024 chinese Society of Particuology and Institute of Process Engineering, chinese Academy of Sciences. Published by Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

关键词： Adsorption Hierarchical microspheres Magnesium silicate Methyl orange Methylene blue Surface modi fication METHYL-ORANgE ADSORPTION AqUEOUS-SOLUTIONS REMOVAL BLUE NANOPARTIcLES PERFORMANcE NANOTUBES cAPAcITY KINETIcS ISOTHERM

A harmonic-wave bio-thermal method for continuous monitoring skin thermal conductivity and capillary perfusion rate

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Nano Research 2024年第5期17卷 4420-4427页

作者： Yuxin Ouyang Jie Lin Jiajing Pei Rui Sui Di Liu Yanhui feng Lin qiu School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Department of chemistry Tsinghua UniversityBeijing 100084China Institute of Analysis and Testing Beijing Academy of Science and TechnologyBeijing 100089China

The revelation of thermal energy exchange mechanism of human body is challenging yet worthwhile,because it can clearly explain the changes in human symptoms and health ***,the heat transfer of the skin is significant because the skin is the foremost organ for the energy exchange between the human body and the *** order to diagnose the physiological conditions of human skin without causing any damage,it is necessary to use a non-invasive measurement technique by means of a conformal flexible *** harmonic method can minimize the thermal-induced injury to the skin due to its low heat generating properties.A novel type of computational theory assessing skin thermal conductivity,blood perfusion rate of capillaries in the dermis,and superficial subcutaneous tissues was formed by combining the multi-medium thermal diffusion model and the bio-thermal model(Pennes equation).The skins of the hand back of six healthy subjects were *** was found that the results revealed no consistent changes in thermal conductivity were observed across genders and *** measured blood perfusion rates were within the range of human capillary *** was found that female subjects had a higher perfusion rate range(0.0058-0.0061 s^(-1))than male subjects(0.0032-0.0049 s^(-1)),which is consistent with invasive medical studies about the gender difference in blood flow rates and stimulated effects in relaxation situations.

关键词： thermal conductivity blood perfusion rate harmonic method Pennes equation

The q-index and connectivity of graphs

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Journal of the Operations Research Society of china 2024年第2期12卷 505-519页

作者： Peng-Li Zhang Li-Hua feng Wei-Jun Liu Xiao-Dong Zhang School of Mathematical Sciences MOE-LSCSHL-MACShanghai Jiao Tong UniversityShanghai 200240China School of Mathematics and Statistics Central South UniversityChangsha 410083HunanChina

A connected graph g is said to be k-connected if it has more than k vertices and remains connected whenever fewer than k vertices are *** this paper,for a connected graph g with sufficiently large order,we present a tight sufficient condition for g with fixed minimum degree to be k-connected based on the *** result can be viewed as a spectral counterpart of the corresponding Dirac-type condition.

关键词： q-index Minimum degree k-connected

Effect of titanium on the sticking of pellets based on hydrogen metallurgy shaft furnace:Behavior analysis and mechanism evolution

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International Journal of Minerals,Metallurgy and Materials 2024年第2期31卷 282-291页

作者： Jinge feng Jue Tang Zichuan Zhao Mansheng chu Aijun Zheng Xiaobing Li Xiao’ai Wang School of Metallurgy Northeastern UniversityShenyang 110819China Institute for Frontier Technologies of Low-carbon Steelmaking Northeastern UniversityShenyang 110819China Liaoning Low-carbon Steelmaking Technology Engineering Research center Northeastern UniversityShenyang 110819China Engineering Research center of Frontier Technologies for Low-carbon Steelmaking(Ministry of Education Shenyang 110819China Zhang Xuan Technology of HBIS group co. Ltd.Shijiazhuang 050000China Xuanhua Iron and Steel group co. Ltd.Shijiazhuang 050000China Iron and Steel Research Institute of HBIS group co. Ltd.Shijiazhuang 050000China

Direct reduction based on hydrogen metallurgical gas-based shaft furnace is a promising technology for the efficient and low-carbon smelting of vanadium-titanium ***,in this process,the sticking of pellets occurs due to the aggregation of metal-lic iron between the contact surfaces of adjacent pellets and has a serious negative effect on the continuous *** paper presents a detailed experimental study of the effect of TiO2 on the sticking behavior of pellets during direct reduction under different *** showed that the sticking index(SI)decreased linearly with the increasing TiO2 *** phenomenon can be attributed to the increase in unreduced FeTiO3 during reduction,leading to a decrease in the number and strength of metallic iron interconnections at the sticking *** the TiO2 addition amount was raised from 0 to 15wt%at 1100°c,the SI also increased from 0.71%to 59.91%.The connection of the slag phase could be attributed to the sticking at a low reduction temperature,corresponding to the low sticking ***,the interconnection of metallic iron became the dominant factor,and the SI increased sharply with the increase in re-duction ***2 had a greater effect on SI at a high reduction temperature than at a low reduction temperature.

关键词： titanium sticking index hydrogen metallurgy direct reduction pellets

Bifunctional core–shell co-catalyst for boosting photocatalytic cO_(2) reduction to cH_(4)

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Nano Research 2024年第3期17卷 1259-1266页

作者： Fangxu Dai Mingming Zhang Jishu Han Zhenjiang Li Shouhua feng Jun Xing Lei Wang Key Laboratory of Eco-chemical Engineering Ministry of EducationCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China college of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042China college of Environment and Safety Engineering Qingdao University of Science and TechnologyShandong Engineering Research Center for Marine Environment Corrosion and Safety ProtectionQingdao 266042China

Solar-light-driven cO_(2) reduction cO to cH_(4) and c2H6 is a complex process involving multiple elementary reactions and energy ***,achieving high cH_(4) activity and selectivity remains a significant ***,we integrate bifunctional cu2O and cu-MOF(MOF=metal-organic framework)core–shell co-catalysts(cu2O@cu-MOF)with semiconductor TiO_(2).Experiments and theoretical calculations demonstrate that cu2O(cu+facilitates charge separation)and cu-MOF(cu2+improves the cO_(2) adsorption and activation)in the core–shell structure have a synergistic effect on photocatalytic cO_(2) reduction,reducing the formation barrier of the key intermediate*cOOH and**** photocatalyst exhibits high cH_(4) yield(366.0μmol·g^(-1)·h^(-1)),efficient electron transfer(3283μmol·g^(-1)·h^(-1))and hydrocarbon selectivity(95.5%),which represents the highest activity of cu-MOF-based catalysts in photocatalytic cO_(2) reduction *** work provides a strategy for designing efficient photocatalysts from the perspective of precise regulation of components.

关键词： bifunctional co-catalyst core–shell photocatalytic cO_(2)reduction

Ag-doped Ti3c2Tx sensor: A promising candidate for low-concentration H2S gas sensing

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HIgH VOLTAgE 2024年第3期9卷 537-545页

作者： Zeng, Fuping feng, Xiaoxuan chen, Xiaoyue qiu, Hao Yan, Yiming Yao, qiang Tang, Ju Wuhan Univ Sch Elect Engn & Automat Wuhan Peoples R China Hubei Key Lab Power Equipment & Syst Secur Integra Wuhan Peoples R China State grid chengdu Elect Power Supply co Chengdu Peoples R China chongqing Univ State Key Lab Power Transmiss Equipment Syst Secur Chongqing Peoples R China State grid chongqing Elect Power Res Inst Chongqing Peoples R China

Trace hydrogen sulphide (H2S) could reflect the severity of insulation faults in gas-insulated switchgear (gIS), therefore, accurate and fast detection of low-concentration H2S is important for on-line monitoring, fault diagnosis, and state evaluation in gIS. Ag-Ti3c2Tx chemiresistive-type sensors were fabricated via drop-coating with self-reduction synthesised Ag-doped Ti3c2Tx. The as-prepared sensors exhibited an excellent sensitivity and selectivity to H2S with an extremely low detection of limit of 18.57 parts per billion (ppb) at 25 degrees c (room temperature). The response of Ag-Ti3c2Tx sensor to 10 parts per million (ppm) H2S was enhanced similar to 12 times than that of the pristine Ti3c2Tx sensor. The compositing of Ti3c2Tx with Ag nanoparticles (NPs) enabled the fast response/recovery time for H2S detection. Further analysis found that the enhanced H2S sensing performances could be attributed to chemical sensitisation, adsorbed oxygen species regulation and high Brunauer-Emmett-Teller (BET) surface area. This study paves the way for Ag-Ti3c2Tx as room-temperature sensing materials to detect low-concentration H2S in gIS.

关键词： 2ND DISSOcIATION-cONSTANT PARTIAL DIScHARgE NEURAL-NETWORK DEcOMPOSITION MOLEcULES REMOVAL