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In situ formed Mg(BH_(4))_(2) for improving hydrolysis properties of MgH_(2)

Journal of Magnesium and Alloys 2024年第3期12卷 1204-1214页

作者： Yongyang Zhu Mili Liu liming Zeng Yin Wang Daifeng Wu Rui Li Qing Zhou Renheng Tang fangming xiao Institute of Resources Utilization and Rare Earth Development Guangdong Provincial Key Laboratory of Rare Earth Development and ApplicationGuangdong Academy of SciencesGuangzhou 510650China School of Materials Science and Engineering Guangdong Provincial Key Laboratory of Advanced Energy Storage MaterialsSouth China University of TechnologyGuangzhou 510641China

The hydrolysis of MgH_(2) delivers high hydrogen capacity(15.2 wt%),which is very attractive for real-time hydrogen ***,the formation of a surface passivation Mg(OH)_(2) layer and the large excess of H_(2)O required to ensure complete hydrolysis are two key challenges for the MgH_(2) hydrolysis ***,a low-cost method is reported to synthesize MgH_(2)@Mg(BH_(4))_(2) composite via ball-milling MgH_(2) with cheap and widely available B_(2)O_(3)(or B(OH)_(3)).By adding small amounts of B_(2)O_(3),the in-situ formed Mg(BH_(4))_(2) could significantly promote the hydrolysis of MgH_(2).In particular,the MgH_(2)–10 wt%B_(2)O_(3) composite releases 1330.7 mL·g^(−1) H_(2)(close to 80%theoretical hydrogen generation H_(2))in H_(2)O and 1520.4 mL·g^(−1) H_(2)(about 95%)in 0.5 M MgCl_(2) in 60 min at 26℃ with hydrolysis rate of 736.9 mL·g^(−1)·min^(−1) and 960.9 mL·g^(−1)·min^(−1) H_(2) during the first minute of the hydrolysis,*** addition,the MgCl_(2) solution allows repeated use by filtering and exhibits high cycle stability(20 cycles),therefore leading to much reduced capacity loss caused by the excess H_(2)*** show that by introducing B_(2)O_(3) and recycling the 0.5 M MgCl_(2) solution,the system hydrogen capacity can approach 5.9 wt%,providing a promising hydrogen generation scheme to supply hydrogen to the fuel cells.

关键词： Hydrolysis MgH_(2) Mg(BH_(4))_(2) Hydrogen generation B_(2)O_(3) MgCl_(2)

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Structure and electrochemical properties of hypo-stoichiometric hydro-gen storage alloys prepared by twin-roller rapid quenching process

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Rare Metals 2005年第4期24卷 336-340页

作者： ZHOU Liu LU Dongsheng LI Weishan HU Shejun CAI Yuepeng TANG Renheng xiao fangming Department of Chemistry South China Normal University Guangzhou 510631 China Guangzhou Institute of Nonferrous Metal Research Guangzhou 5100013 China

The stoichiometric alloy MlB5.0 and the hypo-stoichiometric alloy MlB4.85 were prepared by twin-roller rapid quenching process, and their structure and electrochemical properties were studied. The results of XRD show that both of the alloys have a typical single-phase hexagonal CaCus-type structure. The cell volume of the hylpo-stoichiometric alloy M1B4.85 is slightly larger than that of the stoichiometric alloy M1B5.0, although its lattice constant cla is smaller. Under 2 C discharging rate, i.e. 640 mA/g, the M1B4.85 has a discharge capacity of 320 mAh/g, which is higher than that of the M1Bs.o, 312 mAh/g. Nevertheless, the capacities of the M1B4.85 and the M1Bs.o decline 24.7% and 20.2% after 400 cycles, respectively. The relationship of electrochemical performances of the alloys with their structures is discussed.

关键词： hydrogen storage alloys structure electrochemical properties XRD electrochemical methods stoichiometry twin-roller rapid quenching process

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Characteristic Investigation of Nano-Crystal Hydrogen Storage Alloys

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Journal of Rare Earths 2004年第Z1期22卷 232-234页

作者： xiao fangming Huang Lili Tang Renheng Lu Qiyun Peng Neng Wang Ying Rare Earth Materials Research Center Guangzhou Research Institute of Nonferrous Metals Guangzhou 510651 China Rare Earth Materials Research Center Guangzhou Research Institute of Nonferrous Metals Guangzhou 510651 China Rare Earth Materials Research Center Guangzhou Research Institute of Nonferrous Metals Guangzhou 510651 China Rare Earth Materials Research Center Guangzhou Research Institute of Nonferrous Metals Guangzhou 510651 China Rare Earth Materials Research Center Guangzhou Research Institute of Nonferrous Metals Guangzhou 510651 China Rare Earth Materials Research Center Guangzhou Research Institute of Nonferrous Metals Guangzhou 510651 China

A Ml (NiCoMnA1)5 hydrogen storage alloys was prepared by double-roller rapid *** microstructure, electrochemically and kinetic characteristic were studied.A uniform crystal phase with CaCu5 structure could be detected by XRD analyses, whose average grain size is 30 ～ 50 nm and the ratio of c/a of nano-crystal hydrogen storage alloy is *** hydrogen absorption/desertion p - C isotherms of alloy show that its fiat-performance is perfect and the magnetic stagnant effect is very *** simulate cell is used for electrochemical *** is 10C, the capacity decreasing rate via the 450 cycles at 7C is less than 20%.

关键词： nano-crystal hydrogen storage alloys electrochemically characteristic

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Plant Programmed Cell Death Caused by an Autoactive Form of Prf Is Suppressed by Co-Expression of the Prf LRR Domain

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Molecular Plant 2012年第5期5卷 1058-1067页

作者： Xinran Du Min Miao Xinrong Ma Yongsheng Liu Joseph C. Kuhl Gregory B. Martin fangming xiao Department of Plant. Soil and Entomoloqical Sciences University of Idaho Moscow ID 83844. USA Ministry of Education Key Laboratory for Bio-Resource and Eco-Environment College of Life Science and State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan University Chengdu 610064 China Chengdu Institute of Biology Chinese Academia of Sciences Chengdu 610064 China School of Biotechnology and Food Engineering Hefei University of Technology Hefei 230009 China Boyce Thompson Institute for Plant Research and Department of Plant Pathology and Plant-Microbe Biology Cornell University Ithaca NY 14853 USA

In tomato, the NBARC-LRR resistance （R） protein Prf acts in concert with the Pto or Fen kinase to determine immunity against Pseudomonas syringae pv. tomato （Pst）. Prf-mediated defense signaling is initiated by the recognition of two sequence-unrelated Pst-secreted effector proteins, AvrPto and AvrPtoB, by tomato Pto or Fen. Prf detects these inter- actions and activates signaling leading to host defense responses including localized programmed cell death （PCD） that is associated with the arrest of Pst growth. We found that Prf variants with single amino acid substitutions at D1416 in the IHD motif （isoleucine-histidine-aspartic acid） in the NBARC domain cause effector-independent PCD when transiently expressed in leaves of Nicotiana benthamiana, suggesting D1416 plays an important role in activation of Prf. The N-ter- minal region of Prf （NPrf） and the LRR domain are required for this autoactive Prf cell death signaling but dispensable for accumulation of the PrfD1416V protein. Significantly, co-expression of the Prf LRR but not NPrf, with PrfD1416v, AvrPto/Pto, AvrPtoB/Pto, an autoactive form of Pro （PtoY207D）, or Fen completely suppresses PCD. However, the Prf LRR does not in- terfere with PCD caused by Rpi-blblD475v a distinct R protein-mediated PCD signaling event, or that caused by overex- pression of MAPKKKα, a protein acting downstream of Prf. Furthermore, we found the PrfD1416V protein is unable to accumulate in plant cells when co-expressed with the Prf LRR domain, likely explaining the cell death suppression. The mechanism for the LRR-induced degradation of PrfD1416V is unknown but may involve interference in the intramo- lecular interactions of Prf or to binding of the unattached LRR to other host proteins that are needed for Prf stability.

关键词： NBARC-LRR resistance protein Prf Pto Fen AvrPto AvrPtoB cell death.

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人工智能助推教师队伍建设和数字教育建设的并行路径

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中小学校长 2023年第11期 9-12页

作者：肖方明中共重庆市渝中区委教育工委国家教育行政学院第五十一期全国地(市)教育局

重庆市渝中区深入实施数字教育迭代升级行动,统筹推进数字教育建设和教育部人工智能助推教师队伍建设试点工作。通过强化“双轮驱动、双线并行”的顶层设计,优化“智联共融、智慧共享”的数字环境,细化“多元协同、多维提升”的培养模式... 详细信息

重庆市渝中区深入实施数字教育迭代升级行动,统筹推进数字教育建设和教育部人工智能助推教师队伍建设试点工作。通过强化“双轮驱动、双线并行”的顶层设计,优化“智联共融、智慧共享”的数字环境,细化“多元协同、多维提升”的培养模式,深化“精准教学、精细治理”的融合应用,转化“名师引领、名校带动”的资源优势,探索实施人工智能助推教师队伍建设和数字教育建设的并行路径,以数字化推动区域教育高质量发展。

关键词：人工智能教师队伍建设教育数字化

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Ti-Mn基高容量固态低压储氢合金研究

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稀有金属 2023年第3期47卷 357-364页

作者：吴岱丰李睿陈鹏允周庆唐仁衡肖方明广东省科学院稀有金属研究所广东广州510651

为了推动氢储能系统的实用化,需要开展用于规模储氢用途的储氢合金的配方研究。以Ti_(0.9)5Zr_(0.05)Mn_(2)合金作为研究对象,开发储氢量高、平台压力合适且容易活化AB_(2)型储氢合金,系统研究加入V-Fe,调整Mn含量,以及用纯金属V与Fe替... 详细信息

为了推动氢储能系统的实用化,需要开展用于规模储氢用途的储氢合金的配方研究。以Ti_(0.9)5Zr_(0.05)Mn_(2)合金作为研究对象,开发储氢量高、平台压力合适且容易活化AB_(2)型储氢合金,系统研究加入V-Fe,调整Mn含量,以及用纯金属V与Fe替代V-Fe等方法对调整储氢合金性能的作用。研究发现加入V-Fe会使得储氢合金晶格参数增大,提高储氢合金的活化性能,但过多V-Fe会大幅度降低合金吸/放氢平台压与储氢量;提高Mn含量会导致吸/放氢平台与上升,储氢量先增后减,在A侧元素稍微过量时(B/A=1.96(摩尔比))有利于获得综合性能较好的合金;用纯金属V与Fe替代V-Fe能进一步提高储氢合金性能,随着Fe/V比例增加,合金储氢量下降,吸/放氢平台压上升,平台斜率下降。最终优化出综合性能良好的Ti_(0.9)5Zr_(0.05)Mn_(1.46)V_(0.39)Fe_(0.13),该合金能在80℃下活化,在20℃吸放氢平台分别为1.812和0.751 MPa,储氢量为1.83%。

关键词： Ti-Mn基储氢合金元素替代活化性能储氢量平台压力

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The tomato homolog(SISUVH3)of histone methyltransferase is a possible target of the Cu14-DDBl E3 ligase that involves in cell division and plant development

The tomato homolog(SISUVH3)of histone methyltransferase is a...

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2013全国植物生物学大会

作者： MIAO Min GAO Lanyang xiao fangming LIU Yongsheng School of Biotechnology and Food Engineering Hefei University of Technology Ministry of Education Key Laboratory for Bio-resource and Eco-environment College of Life ScienceState Key Laboratory of Hydraulics and Mountain River EngineeringSichuan University Department of Plant Soil and Entomological SciencesUniversity of IdahoMoscowID83844-2339USA

Histone methylation plays crucial roles in epigenetic *** SET domain proteins generally having methyhransferase activity targeted to specific lysine residues of histones. The enzymes and their specific histone lysine methylation have enormous impacts on the regulation of chromatin structure and ***,we characterized a ubiquitin-associated tomato SET domian protein SUVH3(SlSUVH3) that was implicated as the substrate of the Cul4-DDB1 E3 *** S1SUVH3 protein was shown to have H3 methyhransferase activity and to interact with both DDB1 and Cul4 in plant cell,and these three components appear to form a *** histone methyltransferase SlSUVH3 could be ubiquitinated and its stability was profundly affected by *** of SlSUVH3 in transgenic plants showed abnormal phenotypes,inculding decreased growth and shrinking *** results suggest that the SlSUVH3 might be involved in cell division process via its H3 methyhransferase activity and subjected to ubiquitin-mediated degredation.

关键词： Cul4-DDB1 E3 ligase histon methyltransferase cell division plant development

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含锰溶液中钛基铱锡氧化物电极的电化学特性

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稀有金属 2020年第10期44卷 1063-1069页

作者：蒋玉思陈少纯肖方明广东省稀有金属研究所广东广州510650

锰离子是金属电积液中典型的金属杂质,会影响电极的阳极反应过程。以纯钛为基体、以氯铱酸和氯化亚锡为涂层金属源物质,采用热氧化分解法制备出钛基铱锡氧化物电极。应用循环伏安(CV)、线性电势扫描(LSV)、计时电位和电化学阻抗等方法... 详细信息

锰离子是金属电积液中典型的金属杂质,会影响电极的阳极反应过程。以纯钛为基体、以氯铱酸和氯化亚锡为涂层金属源物质,采用热氧化分解法制备出钛基铱锡氧化物电极。应用循环伏安(CV)、线性电势扫描(LSV)、计时电位和电化学阻抗等方法研究了钛基铱锡氧化物电极在含锰溶液中的电化学特性,借助扫描电镜(SEM)观察了铱锡氧化物电极阳极化过程中沉积的氧化锰表面形貌。结果表明,当1.5mol·L-1H2SO4溶液中的Mn2+浓度高于2 g·L-1、阳极电位正于1.30 V时,氧气和氧化锰同时在铱锡氧化物电极表面析出,但氧化锰可在0.8 V下还原为Mn2+;在低过电位下,电极表面沉积的氧化锰颗粒粗大,在高过电位下,氧化锰颗粒细小;在4 g·L-1Mn2+溶液中0.1 A·cm-2下恒流阳极化1 h成膜的阻抗为0.23~0.26Ω·cm2;电极表面的Mn2+转化为氧化锰后,增加析氧反应的电荷转移电阻,降低铱锡氧化物电极的析氧电催化活性。钛基铱锡氧化物电极在Mn2+浓度小于2 g·L-1的硫酸溶液中具有良好的应用前景。

关键词：电极铱锡氧化物电化学特性锰电催化性能电积

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锂离子电池高镍三元正极材料LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)的性能研究

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过程工程学报 2022年第6期22卷 754-763页

作者：蔡铖张海燕王英付海阔黄玲唐仁衡肖方明广东工业大学材料与能源学院广东广州510006 广东省稀土开发及应用重点实验室广东省科学院稀有金属研究所广东广州510650 清远佳致新材料研究院有限公司广东清远511517

富镍正极材料(LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2))具有高容量的优点,是锂离子电池正极材料最有潜力的材料之一。为确定最佳合成条件,本工作研究了合成温度对材料性能的影响,并详细分析了材料电化学性能衰减的原因以及循环过程中材料结构... 详细信息

富镍正极材料(LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2))具有高容量的优点,是锂离子电池正极材料最有潜力的材料之一。为确定最佳合成条件,本工作研究了合成温度对材料性能的影响,并详细分析了材料电化学性能衰减的原因以及循环过程中材料结构的变化。采用热重/差示扫描量热法(TG/DSC)、X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(HRTEM)、能谱仪(EDS)、X射线光电子能谱(XPS)等手段对合成的正极材料进行了物化表征,并对其电化学性能进行测试。结果表明,在低温段500℃保温4 h,高温段750℃保温14 h合成的正极材料NCM750在0.2 C首次放电比容量为186.2 mAh/g,首次充放电效率为82.5%,1 C放电比容量为185.1 mAh/g,100次循环后仍有175.2 mAh/g,容量保持率为95.2%。在此条件下合成的材料具有结构稳定,粒径均匀,电化学性能优异等优点,本工作对富镍正极材料的合成及结构变化进行研究,有助于加深对材料的了解。

关键词：锂离子电池正极材料制备工艺煅烧温度循环性能

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汽车发动机用AZ91D合金的表面改性设计与性能研究

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热加工工艺 2017年第22期46卷 184-188页

作者：宋飞肖方明南京信息职业技术学院江苏南京210023 华南理工大学广东广州510641

对汽车发动机用AZ91D合金进行等离子喷涂和激光重熔改性处理,采用扫描电子显微镜(SEM)、X射线衍射分析(XRD)、显微硬度计、电化学工作站研究了AZ91D合金基材和涂层的显微形貌、物相组成、摩擦磨损和耐腐蚀性能。结果表明,等离子喷涂涂... 详细信息

对汽车发动机用AZ91D合金进行等离子喷涂和激光重熔改性处理,采用扫描电子显微镜(SEM)、X射线衍射分析(XRD)、显微硬度计、电化学工作站研究了AZ91D合金基材和涂层的显微形貌、物相组成、摩擦磨损和耐腐蚀性能。结果表明,等离子喷涂涂层和激光重熔层的显微硬度相较于AZ91D合金基材有明显提高,提高幅度约为10倍和13倍,而过渡层的显微硬度介于基材和涂层之间;相同载荷下等离子涂层的摩擦系数要高于激光重熔层,AZ91D合金基材的磨损机制主要为粘着磨损和磨粒磨损,等离子喷涂涂层和激光重熔层的磨损机制为轻微磨粒磨损;等离子喷涂涂层和激光重熔涂层的耐腐蚀性能都要远优于AZ91D合金基材,由于具有致密均匀的涂层结构,激光重熔层具有最小的腐蚀倾向和腐蚀速率,耐腐蚀性能最好。

关键词： AZ91D合金等离子喷涂激光重熔摩擦磨损耐腐蚀

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