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In-plane grain boundary induced defect state in hierarchical NiCo-LDH and effect on battery-type charge storage

Nano Research 2023年第4期16卷 4908-4916页

作者： Jinjin Ban Xiaohan Wen honghong lei Guoqin Cao Xinhong Liu Chunyao Niu Guosheng Shao Junhua Hu School of Materials Science and Engineering Industrial Technology Research Institute of Resource and Materials of Henan ProvinceZhengzhou UniversityZhengzhou 450001China State Center for International Cooperation on Designer Low-carbon&Environmental Materials(CDLCEM) Zhengzhou University100 Kexue AvenueZhengzhou 450001China Henan Provincial Key Laboratory for Metal Fuel Battery Foguang Power Generation Equipment Co.Ltd50 Holly StreetZhengzhou 450000China International Laboratory for Quantum Functional Materials of Henan School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450001China

Domain boundaries are regarded as the effective active sites for electrochemical energy storage materials due to defects enrichment ***,layered double hydroxides(LDHs)tend to grow into single crystalline nano sheets due to their unique two-dimentional(2D)lattice ***,much efforts were made on the designing hierarchical structure to provide more exposed electroactive sites as well as accelerate the mass ***,we demonstrate a strategy to introduce low angle grain boundary(LAGB)in the flakes of Ni/Co layered double hydroxides(NiCo-LDHs).These defect-rich nano flakes were self-assembled into hydrangea-like spheres that further constructed hollow cage *** the formation of hierarchical structure and grain boundaries are interpreted with the synergistic effect of Ni2+/Co2+ratio in an“etching-growth”*** domain boundary defect also results in the preferential formation of oxygen vacancy(Vo).Additionally,density functional theory(DFT)calculation reveals that Co substitution is a critical factor for the formation of adjacent lattice defects,which contributes to the formation of domains *** fabricated battery-type Faradaic NiCo-LDH-2 electrode material exhibits significantly enhanced specific capacitance of 899 C·g^(−1)at a current density of 1 A·g^(−1).NiCo-LDH-2//AC asymmetric capacitor shows a maximum energy density of 101.1 Wh·kg^(−1)at the power density of 1.5 kW·kg^(−1).

关键词： sacrificial template grain boundary oxygen vacancy(Vo) hierarchical structure

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Recent advances based on Mg anodes and their interfacial modulation in Mg batteries

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Journal of Magnesium and Alloys 2022年第10期10卷 2699-2716页

作者： Fanfan Liu Guoqin Cao Jinjin Ban honghong lei Yan Zhang Guosheng Shao Aiguo Zhou Li zhen Fan Junhua Hu School of Materials Science and Engineering Industrial Technology Research Institute of Resource and Materials of Henan ProvinceZhengzhou UniversityZhengzhou 450001China State Center for International Cooperation on Designer Low-carbon and Environmental Materials(CDLCEM) Zhengzhou UniversityZhengzhou 450001China Henan Provincial Key Laboratory for Metal Fuel Battery Foguang Power Generation Equipment Co.Ltd50 Holly StreetZhengzhou 450000China School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167China Henan Key Laboratory of Materials on Deep-Earth Engineering School of Materials Science and EngineeringHenan Polytechnic UniversityJiaozuo 454000China Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China

Magnesium(Mg)batteries(MBs),as post-lithium-ion batteries,have received great attention in recent years due to their advantages of high energy density,low cost,and safety ***,the formation of passivation layers on the surface of Mg metal anode and the poor compatibility between Mg metal and conventional electrolytes during charge-discharge cycles seriously affect the performance of *** great possibility of generating Mg dendrites has also caused controversy among ***,the regulation of Mg deposition and the enhancement of battery cycle stability is largely limited by interfacial stability between Mg metal anode and *** this review,recent advances in interfacial science and engineering of MBs are summarized and *** attention is given to interfacial chemistry including passivation layer formation,incompatibilities,ion transport,and dendrite *** for building stable electrode/interfaces,such as anode designing and electrolyte modification,construction of artificial solid electrolyte interphase(SEI)layers,and development of solid-state electrolytes to improve interfacial contacts and inhibit Mg dendrite and passivation layer formation,are *** approaches,representative examples,and challenges in developing high-performance anodes are described in *** on the review of these strategies,reference is provided for future research to improve the performance of MBs,especially in terms of interface and anode design.

关键词： Magnesium anode Dendrite Passivation layers Interfacial engineering Solid electrolyte interphase

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钼酸铅重量法测定钼铁中钼的方法改进

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冶金分析 2022年第5期42卷 85-90页

作者：雷红红周详史锐奇王照辉陈凯蒋朋北京凤凰城电子材料技术研究院有限公司中国地质大学(北京) 北京科技大学

GB/T 5059.1—2014测定钼铁中钼含量的钼酸铅重量法使用硝酸和氟化铵溶解钼铁，用氢氧化钠分离铁等干扰元素后，加NaEDTA进一步屏蔽干扰元素，以甲基橙指示剂和单宁指示剂确定反应终点。氟化铵遇热分解形成的氟化氢会腐蚀玻璃烧杯，且... 详细信息

GB/T 5059.1—2014测定钼铁中钼含量的钼酸铅重量法使用硝酸和氟化铵溶解钼铁，用氢氧化钠分离铁等干扰元素后，加NaEDTA进一步屏蔽干扰元素，以甲基橙指示剂和单宁指示剂确定反应终点。氟化铵遇热分解形成的氟化氢会腐蚀玻璃烧杯，且存在过滤和洗涤氢氧化物沉淀耗时长、指示剂变色不明显、所用化学试剂种类多的问题。为缩短检测时间，简化实验流程，对上述方法进行了改进：用乙酸-硝酸在50～70℃低温溶解钼铁试样，煮沸并蒸发至近干除去氮氧化物后，加水稀释至150 mL,加入30 mL NaEDTA溶液络合铁、铜等杂质离子。在乙酸-乙酸铵缓冲溶液环境下，加入120 g/L乙酸铅溶液，使钼全部形成钼酸铅沉淀。120℃烘干沉淀，在马弗炉中180℃灰化并在550℃灼烧后进行称重，计算钼含量。实验方法用于测定3个钼铁中钼，结果的相对标准偏差(RSD,n=5)小于0.2%;按照实验方法测定钼铁标准样品中钼，结果与标准值相一致。改进后的方法不仅解决了溶解液腐蚀玻璃烧杯的问题，而且不用氢氧化钠沉淀剂，无需使用变色指示剂，减少了实验误差，缩短了测试时间，适合生产型企业快速测定钼铁中钼含量。

关键词：钼铁钼酸铅重量法钼乙酸 Na2EDTA

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大功率燃料电池阴极催化剂的设计和可控量产制备

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过程工程学报 2023年第7期23卷 995-1002页

作者：李荣荣雷红红翟兆岩吴磊李小丽刘保银张艳娜王熙肖建军河南省金属燃料电池重点实验室河南郑州450001 郑州佛光发电设备股份有限公司河南郑州450001 郑州大学机械与动力工程学院河南郑州450001

推进能源结构调整,发展绿色低碳技术对于推动我国清洁能源利用、保障用电安全、实现“双碳”目标具有重要的战略意义。金属燃料电池具有高能量密度、低成本、高安全性、清洁无污染等优势,是极具潜力的新一代电能源装置,近年来受到广泛... 详细信息

推进能源结构调整,发展绿色低碳技术对于推动我国清洁能源利用、保障用电安全、实现“双碳”目标具有重要的战略意义。金属燃料电池具有高能量密度、低成本、高安全性、清洁无污染等优势,是极具潜力的新一代电能源装置,近年来受到广泛关注。然而,由于关键性技术未突破、阴极催化剂成本高等问题,导致金属燃料电池未能实现大规模应用。高性能非贵金属催化剂的开发是燃料电池有效推广的重要前提,本研究采用价格低廉的碳纳米管、乙酸钴、乙酸锰和氢氧化钠作为原材料,利用一步共沉淀法在多壁碳纳米管基体上负载过渡金属氧化物,制备了具有稳定结构的尖晶石相的CoMn_(3)O_(x)/CNTs催化剂。X射线衍射及氧还原测试结果表明,煅烧温度为350℃的催化剂的结晶度高,氧还原催化活性最高。扫描电镜及能谱分析结果显示,CoMn_(3)O_(x)活性成分均匀附着在碳纳米管表面,颗粒大小为纳米级,各组分元素分布均匀,Co和Mn元素的原子数比接近设计值1:3。氧还原性能测试结果显示,CMO/CNTs-350催化剂的极限电流密度和半波电位分别达到5.59 mA/cm^(2)和0.75 V,宏量制备后性能保持良好。将该催化剂应用于3 kW铝空气电源,恒功率连续运行12 h后单体平均电压1.14 V。基于原材料丰富易得、生产工艺可控、电化学性能优异等特点,CMO/CNTs-350催化剂是一种非常有潜力的金属燃料电池阴极催化剂。

关键词：钴锰复合氧化物共沉淀法氧还原催化金属燃料电池

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基于纳米氧化锌-石墨复合材料的电化学传感器检测对苯二酚

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硅酸盐通报 2023年第8期42卷 3005-3016页

作者：娄童芳徐红杰潘继民张炎雷红红开封大学材料与化学工程学院开封475000 华北水利水电大学材料学院郑州450001 郑州大学材料科学与工程学院郑州450001 南京工程学院材料科学与工程学院南京210000 佛光发电设备股份有限公司郑州450001

对苯二酚(HQ)作为一种稳定剂和抗氧剂主要应用于工业领域,工业废水中对苯二酚的残留对人体及环境危害严重,因此,建立一种简单、准确检测对苯二酚的方法对食品安全和环境监测具有重要意义。本文构建了纳米氧化锌-高纯石墨/玻碳(ZnO-C/GC... 详细信息

对苯二酚(HQ)作为一种稳定剂和抗氧剂主要应用于工业领域,工业废水中对苯二酚的残留对人体及环境危害严重,因此,建立一种简单、准确检测对苯二酚的方法对食品安全和环境监测具有重要意义。本文构建了纳米氧化锌-高纯石墨/玻碳(ZnO-C/GC)复合材料电化学传感器,实验材料简单易得,成本低。利用原子力显微镜(AFM)、场发射扫描电子显微镜(SEM)、X射线衍射(XRD)和电化学交流阻抗法(EIS)分析了纳米ZnO-C复合材料的结构特征、表面特征和导电性,采用循环伏安法(CV)实现了纳米ZnO-C/GC复合材料电化学传感器对对苯二酚的检测,探究了对苯二酚的电催化机理,该电化学传感器检测对苯二酚具有良好的稳定性和准确性,较宽的线性范围,检出限达到1.0×10^(-8)mol/L。

关键词：纳米复合材料电化学传感器氧化锌对苯二酚电催化

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昆明市森林管护分析与对策

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林业建设 2016年第5期 1-6页

作者：徐学杰马玉春刘红虹付磊昆明市森林资源管理总站昆明650223 轿子山国家级自然保护区管理局昆明651515 昆明市林业局昆明650500

以昆明市2013年森林管护调研情况为基础,从森林管护总面积,森林管护队伍数量、人均管护面积、年龄结构、文化层次、报酬和人身保障,管护站点建设等方面研究分析森林管护中存在的问题,提出建立统一管护体系,创新监管形式,加强、稳定管护... 详细信息

以昆明市2013年森林管护调研情况为基础,从森林管护总面积,森林管护队伍数量、人均管护面积、年龄结构、文化层次、报酬和人身保障,管护站点建设等方面研究分析森林管护中存在的问题,提出建立统一管护体系,创新监管形式,加强、稳定管护队伍,提高管护水平等八个方面的对策措施建议。

关键词：森林管护问题分析对策措施昆明市

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氧化锰基电催化材料的设计合成及其铝空气电池应用

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硅酸盐通报 2023年第2期42卷 728-735,742页

作者：胡文静班锦锦谢顺利王瑞智肖建军雷红红河南工业大学化学化工学院郑州450001 郑州大学材料科学与工程学院郑州450001 中原工学院建筑工程学院郑州450007 佛光发电设备股份有限公司郑州450000

电催化剂作为铝空气电池阴极的核心部分,其催化性能的优劣直接影响铝空气电池的产业化进程。本文采用尿素高温处理法将商业的Vulcan-72XC碳材料进行掺氮改性处理制备了N/VC2。在此基础上,进一步负载不同的锰氧化物得到三种Mn3O4@N/VC2、... 详细信息

电催化剂作为铝空气电池阴极的核心部分,其催化性能的优劣直接影响铝空气电池的产业化进程。本文采用尿素高温处理法将商业的Vulcan-72XC碳材料进行掺氮改性处理制备了N/VC2。在此基础上,进一步负载不同的锰氧化物得到三种Mn3O4@N/VC2、MnO@N/VC2和MnO2@N/VC2复合材料。其中,MnO2@N/VC2具有最优的氧还原反应(ORR)催化性能,起始电位高达0.872 V。作为铝空气电池阴极催化剂,在大电流密度下放电功率密度可达到136 mW·cm^(-2)。本文通过对比分析不同氧化锰基复合材料的电催化性能,研究了碳载体和锰氧化物之间的交互作用。结果表明,多孔结构和丰富缺陷位点的协同作用是提高材料催化活性的主要原因。该工作为锰基氧化物催化剂的研发提供理论依据。

关键词：氮掺杂碳材料锰氧化物复合材料铝空气电池功率密度氧还原催化剂

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Promotional catalytic activity and reaction mechanism of Ag-modified Ce_(0.6)Zr_(0.4)O_(2) catalyst for catalytic oxidation of ammonia

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Journal of Environmental Sciences 2023年第2期124卷 491-504页

作者： Xiaolong Tang Yuanyuan Zhang Yaru lei Yuanyuan Liu honghong Yi Fengyu Gao School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants Beijing 100083China

Ce1-xZrxO_(2) composite oxides(molar,x=0-1.0,interval of 0.2)were prepared by a cetyltrimethylammonium bromide-assisted precipitation *** enhancement of silver-species modification and catalytic mechanism of adsorption-transformationdesorption process were investigated over the Ag-impregnated catalysts for lowtemperature selective catalytic oxidation of ammonia(NH_(3)-SCO).The optimal 5 wt.%Ag/Ce_(0.6)Zr_(0.4)O_(2) catalyst presented good NH_(3)-SCO performancewith>90% NH_(3) conversion at temperature(T)≥250°C and 89% N_(2) *** the irregular block shape and underdeveloped specific surface area(∼60m2/g),the naked and Ag-modified Ce_(0.6)Zr_(0.4)O_(2) solid solution still obtained highly dispersed distribution of surface elements analyzed by scanning electron microscope-energy dispersive spectrometer(SEM-EDS)(mapping),N_(2) adsorptiondesorption test and X-ray diffraction(XRD).H2 temperature programmed reduction(H2-TPR)and X-ray photoelectron spectroscopy(XPS)results indicated that Ag-modification enhanced the mobility and activation of oxygen-species leading to a promotion on CeO_(2) reducibility and synergistic Ag0/Ag+and Ce^(4+)/Ce^(3+)redox ***,Ag+/Ag_(2)O clusters could facilitate the formation of surface oxygen vacancies that was beneficial to the adsorption and activation of ***3-temperature programmed desorption(NH_(3)-TPD)showed more adsorption-desorption capacity to ammoniawere provided by physical,weakandmedium-strong acid *** reflectance infrared Fourier transform spectroscopy(DRIFTS)experiments revealed the activation of ammonia might be the control step of NH3-SCO procedure,during which NH3 dehydrogenation derived from NHx-species and also internal selective catalytic reduction(i-SCR)reactions were proposed.

关键词： Ag/Ce_(0.6)Zr_(0.4)O_(2)catalyst Synergistic interaction Catalytic oxidation of ammonia NH3 dehydrogenation Internal selective catalytic reduction

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Rare-earth coordination polymer micro/nanomaterials: Preparation, properties and applications

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Frontiers of Materials Science 2018年第4期12卷 327-347页

作者： honghong ZOU lei WANG Chenghui ZENG Xiaolei GAO Qingqing WANG Shengliang ZHONG Research Center for Ultrafine Powder Materials College of Chemistry and Chemical Engineering Jiangxi Normal UniversityNanchang 330022China

Rare-earth coordination polymers (RECPs), as a family member of coordination polymers (CPs), have been prepared and studied widely. Thanks to their characteristic properties and functions, RECPs have already been used in various application fields ranging from catalysis to drug delivery. In recent years, CPs with tunable morphologies and sizes have drawn increasing interest and attractive attention. This review presents the recent research progress of RECP micro/nanomaterials, and emphasizes the preparation, properties and broad applications of these fascinating materials.

关键词： coordination polymer metal-organic framework rare earth nanomaterials

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Molten salt synthesis,morphology modulation,and lithiation mechanism of high entropy oxide for robust lithium storage

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Journal of Energy Chemistry 2023年第11期86卷 536-545,I0011页

作者： Xuefeng Liu honghong Wang Long Dong Kezhuo Li Haijun Zhang Quanli Jia Shaowei Zhang Wen lei The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Henan Key Laboratory of High Temperature Functional Ceramics Zhengzhou UniversityZhengzhou 450052HenanChina College of Engineering Mathematics and Physical SciencesUniversity of ExeterExeter EX44QFUK Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

High entropy oxides(HEOs)with ideal element tunability and enticing entropy-driven stability have exhibited unprecedented application potential in electrochemical lithium ***,the general control of dimension and morphology remains a major ***,scalable HEO morphology modulation is implemented through a salt-assisted strategy,which is achieved by regulating the solubility of reactants and the selective adsorption of salt ions on specific crystal *** electrochemical properties,lithiation mechanism,and structure evolution of composition-and morphology-dependent HEO anode are examined in *** importantly,the potential advantages of HEOs as electrode materials are evaluated from both theoretical and experimental *** from the high oxygen vacancy concentration,narrow band gap,and structure durability induced by the multi-element synergy,HEO anode delivers desirable reversible capacity and reaction *** particular,Mg is evidenced to serve as a structural sustainer that significantly inhibits the volume expansion and retains the rock salt *** new perspectives are expected to open a window of opportunity to compositionally/morphologi cally engineer high-performance HEO electrodes.

关键词： High-entropy oxide Lithium-ion battery anode Molten salt Morphology modulation Structure stability

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