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Self-supported NiFe-LDH nanosheets on NiMo-based nanorods as high-performance bifunctional electrocatalysts for overall water splitting at industrial-level current densities

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Nano Research 2024年第5期17卷 3769-3776页

作者： yan Zhang Biao Feng minglei yan Zhen Shen Yiqun Chen Jingyi Tian Fengfei Xu Guanghai Chen Xizhang Wang Lijun yang Qiang Wu Zheng Hu Key Laboratory of Mesoscopic Chemistry of Ministry of Education(MOE)and Jiangsu Provincial Lab for Nanotechnology School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China College of Water Conservancy and Hydropower Engineering Sichuan Agricultural UniversityYa’an 625014China

Efficient,durable and economic electrocatalysts are crucial for commercializing water electrolysis ***,we report an advanced bifunctional electrocatalyst for alkaline water splitting by growing NiFe-layered double hydroxide(NiFe-LDH)nanosheet arrays on the conductive NiMo-based nanorods deposited on Ni foam to form a three-dimensional(3D)architecture,which exhibits exceptional performances for both hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).In overall water splitting,only the low operation voltages of 1.45/1.61 V are required to reach the current density of 10/500 mA·cm^(-2),and the continuous water splitting at an industrial-level current density of 500 mA·cm^(-2) shows a negligible degradation(1.8%)of the cell voltage over 1000 *** outstanding performance is ascribed to the synergism of the HER-active NiMo-based nanorods and the OER-active NiFe-LDH nanosheet arrays of the hybridized 3D ***,the dense NiFe-LDH nanosheet arrays enhance the local pH on cathode by retarding OH-diffusion and enlarge the electrochemically active surface area on anode,while the conductive NiMo-based nanorods on Ni foam much decrease the charge-transfer resistances of both *** study provides an efficient strategy to explore advanced bifunctional electrocatalysts for overall water splitting by rationally hybridizing HER-and OER-active components.

关键词： alkaline water splitting bifunctional electrocatalysts layered double hydroxides high durability industrial current densities

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In situ construction of porous hierarchical(Ni3-xFex)FeN/Ni heterojunctions toward efficient electrocatalytic oxygen evolution

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Nano Research 2020年第2期13卷 328-334页

作者： minglei yan Kun Mao Peixin Cui Chi Chen Jie Zhao Xizhang Wang Lijun yang Hui yang Qiang Wu Zheng Hu Key Laboratory of Mesoscopic Chemistry of MOE and Jiangsu Provincial Laboratory of Nanotechnology School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China

As a choke point in water electrolysis,the oxygen evolution reaction(OER)suffers from the severe electrode polarization and large ***,the porous hierarchical hetero-(Nis Fe)FeN/Ni catalysts are in situ constructed for the eficient electrocatalytic OER.X-ray absorption fine structure characterizations reveal the strong Ni-Fe bimetallic interaction in(Niz Fex)FeN/*** study indicates the heterojunction and bimetallic interaction decrease the free-energy change for the rate-limiting step of the OER and the overpotential *** addition,the high conductivity and porous hierarchical morphology favor the electron transfer,electrolyte access and O2 ***,the optimized catalyst achieves a low overpotential of 223 mV at 10 ***^-2,a small Tafel slope of 68 mV:dec^-1,and a high *** excellent performance of the optimized catalyst is also demonstrated by the overall water electrolysis with a low working voltage and high Faradaic ***,the correlation between the structure and performance is well established by the experimental characterizations and theoretical calculations,which confirms the origin of the OER activity from the surface metal oxyhydroxide in situ generated upon applying the *** study suggests a promising approach to the advanced OER electrocatalysts for practical applications by constructing the porous hierarchical metal-compound/metal heterojunctions.

关键词： oxygen evolution reaction electrocatalysts ternary Ni-Fe nitrides heterojunctions /n s/fty construction

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Construction of hierarchical FeNi_(3)@(Fe,Ni)S_(2) core-shell heterojunctions for advanced oxygen evolution

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Nano Research 2021年第11期14卷 4220-4226页

作者： minglei yan Zhiyang Zhao Peixin Cui Kun Mao Chi Chen Xizhang Wang Qiang Wu Hui yang Lijun yang Zheng Hu Key Laboratory of Mesoscopic Chemistry of MOE and Jiangsu Provincial Laboratory of Nanotechnology School of Chemistry and Chemical EngineeringNanjing UniversityNanjing210023China Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Sciencethe Chinese Academy of SciencesNanjing210008China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai201210China

The investigation of earth-abundant electrocatalysts for efficient water electrolysis is of central importance in renewable energy system, which is currently impeded by the large overpotential of oxygen evolution reaction (OER). NiFe sulfides show promising OER activity but are troubled by their low intrinsic conductivities. Herein, we demonstrate the construction of the porous core-shell heterojunctions of FeNi3@(Fe,Ni)S_(2) with tunable shell thickness via the reduction of hierarchical NiFe(OH)x nanosheets followed by a partial sulfidization. The conductive FeNi3 core provides the highway for electron transport, and the (Fe,Ni)S_(2) shell offers the exposed surface for in situ generation of S-doped NiFe-oxyhydroxides with high intrinsic OER activity, which is supported by the combined experimental and theoretical studies. In addition, the porous hierarchical morphology favors the electrolyte access and O_(2) liberation. Consequently, the optimized catalyst achieves an excellent OER performance with a low overpotential of 288 mV at 100 mA·cm^(−2), a small Tafel slope of 48 mV·dec^(−1), and a high OER durability for at least 1,200 h at 200 mA·cm^(−2). This study provides an effective way to explore the advanced earth-abundant OER electrocatalysts by constructing the heterojunctions between metal and corresponding metal-compounds via the convenient post treatment, such as nitridation and sulfidization.

关键词： oxygen evolution reaction electrocatalysts Ni-Fe nitrides core-shell structure heterojunctions

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Oxidating liquid metal interface integrated capacitive pressure detection

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Science China(Technological Sciences) 2023年第6期66卷 1629-1639页

作者： FU Jun-Heng ZHAN Fei XING ZeRong ZHANG Teng SUN XinLong ZENG Yun yan minglei TANG Wei LIU Jing WANG Lei ZHAO yang College of Water Conservancy and Hydropower Engineering Sichuan Agricultural UniversityYa’an 625014China School of Electrical and Electronic Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China Beijing Key Laboratory of Cryo-Biomedical Engineering Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Department of Materials Science and Engineering The University of SheffieldSheffield S13JDUK School of Future Technology University of Chinese Academy of SciencesBeijing 100049China Department of Biomedical Engineering School of MedicineTsinghua UniversityBeijing 100084China

The characteristics of real-time monitoring and flexible integration based on passive capacitive detection are becoming the preferred sensing strategy for wearable ***,the currently designed capacitive sensors mostly focused on the bionic microstructures to improve sensitivity and measurement accuracy,while ignoring the inherent mechanical wear and resistance of multilayer *** this paper,an integrated monolithic capacitive pressure detection based on room temperature liquid metal is designed and fabricated,avoiding the tightness problem of the multi-layer *** oxidized paste-like liquid metal owning superior interfacial wetting properties can stably adhere to the surface of the porous *** gas-filled porous framework endows the capacitive sensor with a mechanical response of 0.0557 g with a response and recovery time of 1.26 and 0.63 s under a load condition of 150 Pa,and steadily maintained in 1600 cycle ***,the capacitive sensor is employed to detect human physiological signals and force shock responses,which could clearly distinguish different action signals,providing a new platform for the subsequent development and design of integrated capacitive sensors.

关键词： liquid metal interfacial wetting capacitive detection motion monitoring

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Nonmacrocyclic Iron(II)Soluble Redox Mediators Leading to High-Rate Li-O_(2)Battery

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CCS Chemistry 2021年第5期3卷 1350-1358页

作者： Baoxing Wang Xiao Wang Xueyi Cheng Jing Zhang minglei yan Guochang Li Lijun yang Qiang Wu Xizhang Wang Zheng Hu Key Laboratory of Mesoscopic Chemistry of MOE Jiangsu Provincial Laboratory for Nano technologySchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023

The lithium-oxygen(Li-O_(2))battery is highly promising but suffers from poor cycling life,especially at high rates;hence,the need for high-efficient accelerating agents is *** macrocyclic Fe-based redox mediators,such as iron(II)phthalocyanine(FePc)and heme,have been developed and anticipated to be ideal due to their bifunctional charge and superoxide shuttling ***,they still operate far below expectations,which could result from the low concentrations in electrolyte due to the strongπ-πinteraction at carbon ***,the authors report a new type of nonmacrocyclic Fe-based redox mediators,iron(II)acetylacetonate[Fe(acac)2]and iron(II)glycinate[Fe(gly)2],which have weakπ-πinteraction with the carbon cathode,thus,remain at high concentrations in the *** Fe(gly)2@Li-O_(2)battery reaches a long life of 321 cycles at 0.5 A g^(−1),which is much superior to the counterpart with the typical macrocyclic FePc,and particularly exhibits a long life of 167 cycles at 2.0 A g^(−1)and 136 cycles at ultrahigh 5.0 A g^(−1).This study demonstrates an efficient strategy to achieve a high-rate performance of Li-O_(2)batteries by developing nonmacrocyclic Fe-based redox mediators with high-efficient electron and superoxide shuttling.

关键词： lithium-oxygen battery redox mediator nonmacrocyclic iron(II)mediator superoxide shuttling high-rate performance

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基于CHC遗传算法的Hadoop作业调度研究

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计算机工程 2016年第3期42卷 61-68页

作者：薛涛燕明磊西安工程大学计算机科学学院西安710048

作业调度是影响Hadoop平台性能的重要因素。基于基本遗传算法(SGA)的作业调度进化代数大、收敛速度慢,且其编码与解码、遗传操作过程中存在过多冗余计算,增加了作业总完成时间。为此,提出一种基于CHC遗传算法的作业调度算法。采用双目... 详细信息

作业调度是影响Hadoop平台性能的重要因素。基于基本遗传算法(SGA)的作业调度进化代数大、收敛速度慢,且其编码与解码、遗传操作过程中存在过多冗余计算,增加了作业总完成时间。为此,提出一种基于CHC遗传算法的作业调度算法。采用双目标函数的控制方式和最优解保留策略,优化作业总完成时间与平均完成时间,从而加快最优解的收敛速度。实验结果表明,与SGA算法相比,CHC算法在作业调度效率、资源利用率等方面有较大的性能提升。

关键词： CHC遗传算法基本遗传算法最优解双目标函数作业调度

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Effective enhancement of electrochemical energy storage of cobalt-based nanocrystals by hybridization with nitrogen-doped carbon nanocages

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Science China Materials 2019年第10期62卷 1393-1402页

作者： Qingming Ma Yuejian Yao minglei yan Jie Zhao Chengxuan Ge Qiang Wu Lijun yang Xizhang Wang Zheng Hu Key Laboratory of Mesoscopic Chemistry of MOE and Jiangsu Provincial Lab for Nanotechnology School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

Cobalt-based oxygenic compounds Co(OH)2,CoO and Co3 O4 are attractive for electrochemical energy storage owing to their high theoretical capacities and pseudocapacitive *** the great efforts to their compositional and morphological regulations,the performances to date are still quite limited owing to the low active surface area and sluggish charge transfer ***,different Co-based nanocrystals(Co-NCs)were conveniently anchored on the hierarchical nitrogen-doped carbon nanocages(hNCNCs)with high specific surface area and coexisting micro-meso-macropores to decrease the size and facilitate the charge ***,a high specific capacity of1170 Fg^-1 is achieved at 2 Ag^-1 for the Co(OH)2/hNCNCs hybrid,in which the capacitance of Co(OH)2(2214 F gco(OH)2)is approaching to its theoretical maximum(2595 Fg^-1),demonstrating the high utilization of active materials by the hybridization with N-doped *** study also reveals that these Co-NCs store/release electrical energy via the same reversible redox reaction despite their different pristine *** insight on the energy storage of Co-based nanomaterials suggests that the commonly-employed transformation of the Co-NCs from Co(OH)2 to CoO and Co3 O4 on carbon supports is unnecessary and even could be harmful to the energy storage *** result is instructive to develop high-energy-density electrodes from transition metal compounds.

关键词： Co-based nanocrystals pseudocapacitance hybridization N-doped carbon nanocages supercapacitors

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简析CAC食品卫生通则(2020版)主要变化

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中国食品卫生杂志 2022年第3期34卷 561-565页

作者：程雅晴李楠毕孝瑞王欣闫明磊中国检验检疫科学研究院北京100176 中国质量认证中心北京100070 沈阳海关技术中心辽宁沈阳110016

2020年11月23日,国际食品法典委员会(CAC)发布最新版《食品卫生通则》,对食品安全管理和HACCP原理的发展具有重要的意义,同时也为国家认监委2021年7月30日发布的2021版《危害分析与关键控制点(HACCP)体系认证实施规则》提供了参考依据... 详细信息

2020年11月23日,国际食品法典委员会(CAC)发布最新版《食品卫生通则》,对食品安全管理和HACCP原理的发展具有重要的意义,同时也为国家认监委2021年7月30日发布的2021版《危害分析与关键控制点(HACCP)体系认证实施规则》提供了参考依据。此次《食品卫生通则》的更新,通过大量的举例和说明扩展了良好卫生规范(GHPs)的内涵,将HACCP原理和准则纳入整体的食品卫生体系,对在良好卫生规范和关键控制点(CCPs)的控制措施的区别做出了明确的界定。另外,补充了过敏原管理、食品安全文化等近年来国际食品安全热点的内容。本文通过与2003版《通则》的对比,详细阐述和解释了新版《通则》中变化的内容,为中国HACCP体系的发展和应用提供思路。

关键词：食品卫生通则国际食品法典委员会食品安全 HACCP

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饲料喷涂光合细菌对凡纳滨对虾肠道微生物多样性的影响

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上海海洋大学学报 2019年第4期28卷 577-586页

作者：汪毅闫明磊李航黄旭雄李松林上海海洋大学农业农村部鱼类营养与环境生态研究中心上海201306 上海市水产养殖工程技术研究中心上海201306 水产科学国家级实验教学示范中心上海201306

以商品饲料为对照组(A组)、喷涂市售光合细菌菌液(B组)、红假单胞菌菌液(C组)和红螺菌菌液(D组)饲料为试验组,研究饲料喷涂不同光合细菌对凡纳滨对虾幼虾[(1.21±0.24) g]生长、肝胰腺消化酶活性及肠道微生物群落组成的影响。结果显示:... 详细信息

以商品饲料为对照组(A组)、喷涂市售光合细菌菌液(B组)、红假单胞菌菌液(C组)和红螺菌菌液(D组)饲料为试验组,研究饲料喷涂不同光合细菌对凡纳滨对虾幼虾[(1.21±0.24) g]生长、肝胰腺消化酶活性及肠道微生物群落组成的影响。结果显示:光合细菌处理组(B、C和D组)的增重率高于对照组,但差异不显著(P>0.05);C组和D组对虾肝胰腺淀粉酶活力显著高于对照组(P0.05)。高通量测序结果表明,随着对虾的生长,其肠道微生物丰富度和多样性均提高。摄食喷涂光合细菌饲料后对虾肠道γ-变形细菌纲所占百分比减少,其中C组和D组γ-变形细菌纲比例显著低于对照组(P<0.05)。各组对虾肠道中检测到的占比大于0.5%的主要微生物属有9个,分别为希瓦氏菌属(Shewanella)、气单胞菌属(Aeromonas)、嗜冷菌属(Algoriphagus)、纤维弧菌属(Cellvibrio)、GpXIII、小梨形菌属(Pirellula)、浮霉状菌属(Planctomyces)、假单胞菌属(Pseudomonas)和红细菌属(Rhodobacter)。使用光合细菌没有显著改变对虾肠道微生物群落的整体丰富度和多样性,但在一定程度上丰富对虾肠道微生物属水平的组成。

关键词：凡纳滨对虾光合细菌生长消化酶微生物群落高通量测序

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圆钢管柱套筒节点试验研究

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建筑结构 2019年第6期49卷 66-68页

作者：闫明磊王俊平李章韬任思茂昆明理工大学建筑工程学院昆明650000

通过设置四个不同的节点试件进行低周反复试验,观察四个节点的不同力学特性,重点分析滞回曲线、骨架曲线。对比环板节点和套筒节点试验结果可以发现,新型的套筒节点的各项力学性能非常理想,不劣于传统的环板节点。对比不同套筒厚度的套... 详细信息

通过设置四个不同的节点试件进行低周反复试验,观察四个节点的不同力学特性,重点分析滞回曲线、骨架曲线。对比环板节点和套筒节点试验结果可以发现,新型的套筒节点的各项力学性能非常理想,不劣于传统的环板节点。对比不同套筒厚度的套筒节点试验结果,发现随着套筒厚度的增加,套筒节点有更好的延性、塑性变形能力和耗能能力。套筒节点的性能提升幅度和套筒厚度不是正比关系,当套筒厚度较小时,随着套筒厚度增加,节点性能提升幅度较大。当套筒厚度较大时,随着套筒厚度增加,节点性能提升幅度较小。从经济方面考虑,建议套筒厚度取10mm。

关键词：新型套筒钢节点参数影响分析节点设计

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