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Chemical Research in Chinese Universities 2024年第3期40卷 521-528页

作者： SHAO Chen GUO Ru LI Hui WANG Xiaozhong YANG Qingfeng lai xiaoyong State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering School of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021P.R.China

Acetone is a tracer for monitoring air quality and a potential breath maker for diabetes. It remains a great challenge for current portable sensors to sensitively and selectively detect acetone at low-ppb (part per billion) level. Herein, we present an ordered mesoporous nickel oxide (NiO) with both large mesopores and ultrathin crystalline frameworks for the detection of low-ppb acetone. The ordered mesoporous NiO replicas with predominant large mesopores of 11 nm, high specific surface areas of 121–128 m2/g and ultrathin crystalline frameworks of 5 nm were synthesized by the nanocasting method and the crystalline properties of NiO frameworks were adjusted by changing the annealing temperature from 300℃ to 750℃, which resulted in different contents of oxygen deficient on the surface of ultrathin frameworks. The gas-sensing properties for all the NiO samples were investigated and the ordered large-pore mesoporous NiO (NiO-600) with maximum oxygen deficient obtained at 600℃ exhibited the highest response (R_(gas)/R_(air)−1=2.9) toward acetone (1 ppm, ppm: part per million), which is 3.4 and 30 times larger than those for common mesoporous NiO obtained at 300℃ and bulk NiO. Notably, a low detection limit (2 ppb), good selectivity and cycling stability were also observed in NiO-600.

关键词： Mesoporous semiconductor NiO Gas sensing Acetone

城区复杂环境下深基坑开挖对邻近地铁影响分析

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城市勘测 2024年第3期 195-200页

作者：羊逸君陈俊辉王颖赖小勇杭州市地铁集团有限责任公司浙江杭州310018 杭州市勘测设计研究院有限公司浙江杭州310012

以杭州市区某邻近地铁的深基坑项目为例,探讨了复杂环境条件下基坑变形控制设计方法。该项目的难点在于如何将地铁保护区内基坑分区开挖与渠道改道结合起来,渠道基坑施工时预先应用了水平向及竖向MJS加固体(局部内插H型钢),主基坑采用了... 详细信息

以杭州市区某邻近地铁的深基坑项目为例,探讨了复杂环境条件下基坑变形控制设计方法。该项目的难点在于如何将地铁保护区内基坑分区开挖与渠道改道结合起来,渠道基坑施工时预先应用了水平向及竖向MJS加固体(局部内插H型钢),主基坑采用了MJS和咬合桩做地连墙槽壁加固等措施,实测数据表明该项目的实施最终有效控制了基坑本体变形和地铁位移,可供相关项目设计参考。

关键词：深基坑复杂环境变形控制地铁设施监测

Controlling synthesis and gas-sensing properties of ordered mesoporous In2O3-reduced graphene oxide(r GO) nanocomposite

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Science Bulletin 2015年第31期60卷 1348-1354页

作者： Ping Xue Xiaomei Yang xiaoyong lai Weitao Xia Peng Li Junzhuo Fang Key Laboratory of Energy Resource and Chemical Engineering State Key Laboratory Cultivation Base of Natural Gas Conversion School of Chemistry and Chemical EngineeringNingxia University

Herein, we describe a strategy for fabricating ordered mesoporous In2O3-reduced graphene oxide(r GO)nanocomposite through ultrasonic mixing, where ordered mesoporous In2O3 nanoparticles are synthesized via the nanocasting route by using mesoporous silica as a hard template, which possess ordered mesostructure with a large surface area of 81 m2g-1, and r GO nanosheets are synthesized from graphite via graphene oxide(GO) as intermediate. After coupled with r GO, mesoporous In2O3 could maintain its ordered mesostructure. We subsequently investigate the gas-sensing properties of all the In2O3 specimens with or without r GO for different gases. The results exhibit the ordered mesoporous In2O3-r GO nanocomposite possesses significantly enhanced response to ethanol even at low concentration levels, superior over pure mesoporous In2O3 nanoparticles. Similar strategy could be extended to other ordered mesoporous metal oxide–r GO nanocomposite for improving the gas-sensing property.

关键词：有序介孔材料纳米复合材料氧化石墨气敏性能控制合成氧化还原介孔结构介孔氧化硅

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中空MOFs材料制备及电催化应用的研究进展

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高等学校化学学报 2023年第1期44卷 227-244页

作者：杨庆凤吕良赖小勇省部共建煤炭高效利用与绿色化工国家重点实验室宁夏大学化学化工学院银川750021

水分裂、金属-空气电池和燃料电池等能源转换技术对解决未来的能源危机和环境问题至关重要.氧还原反应(ORR)、氧析出反应(OER)和氢析出反应(HER)作为其核心反应,存在反应动力学速率较慢的问题,因此,开发研制高效的非贵金属电催化剂具有... 详细信息

水分裂、金属-空气电池和燃料电池等能源转换技术对解决未来的能源危机和环境问题至关重要.氧还原反应(ORR)、氧析出反应(OER)和氢析出反应(HER)作为其核心反应,存在反应动力学速率较慢的问题,因此,开发研制高效的非贵金属电催化剂具有重要意义.金属有机骨架(MOFs)材料因具有高度可调的组成和多孔晶体结构,在不同的应用领域引起了越来越多的关注.中空MOFs纳米材料具有MOFs材料高度可调的组成和结构优势,又具有中空结构纳米材料的优点(如更快的物质传输、更丰富的孔隙率、灵活多变的活性组分、更多的暴露活性位点及对苛刻条件的更好相容性等),在电催化领域显现出巨大的应用潜力.本文对近几年来基于中空结构MOFs材料的制备及在电催化方面应用的研究进展进行了综合评述,并对该领域面临的挑战和发展前景进行了总结和展望.

关键词：中空结构金属-有机骨架材料合成策略电催化

3D hierarchical NiS2/MoS2 nanostructures on CFP with enhanced electrocatalytic activity for hydrogen evolution reaction

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Journal of Materials Science & Technology 2020年第4期39卷 155-160页

作者： Jieqiong Wang Zheng Liu Changhong Zhan Kexi Zhang xiaoyong lai Jinchun Tu Yang Cao State Key Laboratory of Marine Resource Utilization in South China Sea College of Materials and Chemical EngineeringHainan UniversityHaikou 570228China Laboratory Cultivation Base of Natural Gas Conversion School of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021China Qiongtai Normal University Haikou 571127China

The electrocatalytic activity for hydrogen evolution reaction(HER)is strongly correlated with active edge sites and resulting efficient charge transport ***,we presented a facile two-step method to synthesize 3 D hierarchical NiS2/MoS2 composite nanostructures on a carbon fiber paper(CFP)*** nanostructures distributed on CFP uniformly and composed of 2 D nanosheets,which would provide plenty of active edge sites and increase the HER *** measurement suggests that the prepared NiS2/MoS2 exhibit great HER activity including a low overpotential of 102 m V,a small Tafel slope of 67 m V/dec,and a high double-layer capacity of 53.7 m F/cm2 in 1 M KOH aqueous *** addition,the HER activity is almost unchanged after galvanostatic technique with applied current densities of10 m A/cm2 for 20 h.

关键词： 3D hierarchical nanostructure Bimetal sulfide Hydrogen evolution reaction

Exploring the methods on improving CH_(4) delivery performance to surpass the Advanced Research Project Ageney-Energy target

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Chinese Journal of Chemical Engineering 2021年第5期34卷 118-124页

作者： Weichen Zhu Yuxuan He Minman Tong xiaoyong lai Shijia Liang Xu Wang Yanjuan Li Xiao Yan School of Chemistry and Materials Science Jiangsu Normal UniversityXuzhou 221116China State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021China

CH_(4) storage associated with adsorbed natural gas(ANG)technology is an issue attracting great *** the Advanced Research Project Agency-Energy(ARPA-E)targeted deliverable capacity of 315 cm^(3)·cm^(-3)(STP),hundreds of thousands of materials have been experimentally or theoretically evaluated,while the best results still show a 35% gap from the ***,recent theoretical research reveals that the target is beyond the possibility that real materials can be *** get rid of the awkward situation,we make attempts on investigating the CH_(4) delivery performance under other operation *** of raising the discharge temperature(to infinite high)or elevating the storage pressure(to 25 MPa)have been proved to show limited *** this work,it is found that the ARPA-E target can be achieved by using a decreasing storage temperature *** taking 280 CoRE(computation-ready,experimental)COFs(covalent organic frameworks)as ANG materials,when reduce the storage temperature to 190.6 K,the highest deliverable capacity can reach 392 cm^(3)·cm^(-3)(STP),and 16.1% CoRE COFs can surpass the *** target is also achievable when storage at 220 *** performance relationships study shows strong correlation between deliverable capacity and void ***,120 hypothetical COFs are generated to ascertain the optimum void *** addition,the performance of 2D-COFs can be greatly enhanced by increasing the interlayer spacings,***_(4) deliverable capacity(storage at 190.6 K)of ATFG-COF can be improved from 239 to 411 cm^(3)·cm^(-3)(STP)when interlayer spacing is enlarged to 1.65 nm.

关键词： Covalent organic frameworks CH_(4) delivery Adsorbed natural gas Molecular simulation Structure-property relationship Material design

Facile Synthesis of Mesoporous Si-containing γ-Al2O3 Nanofiber with Enhanced Thermal Stability

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Chemical Research in Chinese Universities 2015年第1期31卷 156-159页

作者： HU Fang WANG Yamin lai xiaoyong WU Yusheng DU Fei WANG Chunzhong School of Materials Science and Engineering Shenyang University of Technology Shenyang 110870 P. R. China State Key Laboratory Cultivation Base of Natural Gas Conversion Ningxia University Yinchuan 750021 P. R. China Key Laboratory of Advanced Batteries Physics and Technology Ministry of Education College of Physics Jilin University Changchun 130012 P. R. China

Mesoporous γ-Al2O3 nanofiber was prepared via a simple reverse precipitation route using Si-containing Al（OH）3 and HNO3 as raw materials. The resultant Si-containing mesoporous γ-Al2O3 nanofiber exhibited high surface area of 320 m^2/g, large pore volume of 1.17 cm^3/g and large pore size of 10.5 nm. The introduction of Si element remarkably enhanced the thermal stability of mesoporous γ-Al2O3. The as-prepared nanofiber could maintain relative high surface area（110 m^2/g） and pore volume（0.73 cm^3/g） up to 1100 ℃. The effects of various experimental conditions, such as pH value, reaction temperature and aging temperature on the structural properties of the mesoporous γ-Al2O3 were also investigated.

关键词： Mesoporous γ-Al2O3 Reverse precipitation Thermal stability Nanofiber

Ordered mesoporous NiFe_2O_4 with ultrathin framework for low-ppb toluene sensing

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Science Bulletin 2018年第3期63卷 187-193页

作者： xiaoyong lai Kun Cao Guoxin Shen Ping Xue Dan Wang Fang Hu Jianli Zhang Qingfeng Yang Xiaozhong Wang State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering School of Chemistry and Chemical Engineering Ningxia University Yinchuan750021 China State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China School of Materials Science and Engineering Shenyang University of Technology Shenyang 110870 China

Highly sensitive and selective detection against specific target gases,especially at low-ppb(part per billion)level,remain a great number of challenges in gas sensor *** this paper,we first present an ordered mesoporous NiFe_2O_4 for highly sensitive and selective detection against low-ppb toluene.A series of mesoporous NiFe_2O_4 materials were synthesized by templating from mesoporous silica KIT-6 and its framework thickness was reduced from 8.5 to 5 nm by varying the pore size of KIT-6 from 9.4 to 5.6 nm,accompanied with the increase of the specific surface area from 134 to 216 m^2g^(-1).The ordered mesoporous NiFe_2O_4 with both ultrathin framework of 5 nm and large specific surface area of up to 216 m^2g^(-1)exhibits a highest response(R_(gas)/R_(air)-1=77.3)toward 1,000 ppb toluene at 230℃ and is nearly 7.3 and 76.7 times higher than those for the NiFe_2O_4 replica with thick framework and its bulk counterpart respectively,which also possesses a quite low limit of detection(<2 ppb),and good selectivity.

关键词：框架甲苯 NiFe2O4 应用程序 ppb 传感器复制品敏感

中空多壳层结构材料的制备及气体传感应用研究进展

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高等学校化学学报 2020年第5期41卷 855-871页

作者：孙辉赖小勇宁夏大学省部共建煤炭高效利用与绿色化工国家重点实验室银川750021

先进气体传感器技术在现代社会安全生产生活中扮演着极为重要的角色,而高效敏感材料的设计与开发是其中的关键.中空多壳层结构材料因其独特的层层嵌套的多壳层与多腔体结构而表现出特别的物理化学性质,在气体传感领域显现出巨大的应用潜... 详细信息

先进气体传感器技术在现代社会安全生产生活中扮演着极为重要的角色,而高效敏感材料的设计与开发是其中的关键.中空多壳层结构材料因其独特的层层嵌套的多壳层与多腔体结构而表现出特别的物理化学性质,在气体传感领域显现出巨大的应用潜力.传统的硬模板法、软模板法以及基于奥斯特瓦尔德熟化和柯肯德尔效应的无模板法在中空多壳层纳米结构材料的普适制备及壳层结构的精确调控等方面存在诸多限制.次序模板法的出现突破了上述限制,促进了该领域的迅速发展.本文简要回顾了中空多壳层结构材料制备方法的发展历程,介绍了其在甲醛、乙醇、丙酮、甲苯及二氧化氮等有害气体检测中的具体应用,分析了其在气体传感领域的独特优势,最后对该领域面临的挑战和发展前景进行了总结与展望.

关键词：中空多壳层结构金属氧化物半导体次序模板法气体传感

Ordered Large-pore Mesoporous Cobalt-based Spinel Oxides with High Specific Surface Area and Ultrathin Framework for Excellent Catalytic Performance of Glucose

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Ordered Large-pore Mesoporous Cobalt-based Spinel Oxides wit...