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Boosting pH-Universal Hydrogen Evolution of Molybdenum Disulfide Particles by Interfacial Engineering

Chinese Journal of Chemistry 2021年第2期39卷 288-294页

作者： Liling Liao Lun Yang Gang Zhao Haiqing Zhou Fengming Cai Yi Li xiuzhang wang Fang Yu Synergetic Innovation Center for Quantum Effects and Applications Key Laboratory for Matter Microstructure and Function of Hunan ProvinceKey Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of EducationSchool of Physics and ElectronicsHunan Normal UniversityChangshaHunan410081 China Institute for Advanced Materials Hubei Normal UniversityHuangshiHubei435002 China Nanotechnology&Application Center Ningbo Fengcheng Advanced Energy Materials Research InstituteNingboZhejiang315500 China

The design of high-efficiency non-noble and earth-abundant electrocatalysts for hydrogen evolution reaction(HER)is highly paramount for water splitting and renewable energy *** disulfide(MoS_(2))with abundant edge sites can be utilized as a promising alternative,but its catalytic activity is greatly related to the pH values,especially in an alkaline environment due to the extremely high energy barriers for water adsorption and dissociation *** we report an exceptionally efficient and stable electrocatalyst to improve the sluggish HER process of layered MoS_(2)particles in different pH electrolytes,especially in *** electrocatalyst is constructed by in situ growing selenium-doped MoS_(2)(Se-MoS_(2))nanoparticles on three-dimensional cobalt nickel diselenide(mCo_(0.2)Ni_(0.8)Se_(2))nanostructured *** to the large number of active edge sites of Se-MoS_(2)particles exposed at the surface,robust electrical conductivity and large surface area of mCo_(0.2)Ni_(0.8)Se_(2)support,and strong interfacial interactions between Se-MoS_(2)and mCo_(0.2)Ni_(0.8)Se_(2),this hybrid catalyst shows very outstanding catalytic HER properties featured by low overpotentials of 30 and 122 mV at 10 and 100 mA/cm^(2)with good operational stability in base,respectively,which outperforms most of inexpensive catalysts consisting of layered MoS_(2),transition metal selenides and sulfides,and it performs as well as noble Pt ***,this electrocatalyst is also very active in neutral and acidic electrolytes,requiring low overpotentials of 93 and 94 mV at 10 mA/cm^(2),respectively,demonstrating its superb pH universality as a HER electrocatalyst with excellent catalytic *** study provides a straightforward strategy to construct an efficient non-noble electrocatalyst for driving the HER kinetics in different electrolytes.

关键词： Hydrogen evolution reaction Molybdenum disulfide pH-universal Water splitting Heterogeneous catalysis

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Indosinian isotope ages of plutons and deposits in southwestern Miaoershan-Yuechengling,northeastern Guangxi and implications on Indosinian mineralization in South China

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Chinese Science Bulletin 2012年第9期57卷 1024-1035页

作者： WU Jing LIANG HuaYing HUANG WenTing wang ChunLong SUN WeiDong SUN YaLi LI Jing MO JiHai wang xiuzhang CAS Key Laboratory of Mineralogy and Metallogeny Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China State Key Laboratory of Isotope Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Zijin Mining Group Company Limited Xiamen 364200 China Guangdong Nuclear lndustry Bureau Guangzhou 510800 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

The Miaoershan-Yuechengling complex pluton is the largest granitoid complex in the western Nanling metallogenic belt with a surface exposure of >3000 *** complex pluton is composed of an early stage granitoid batholith and late stage small *** early stage batholith contains mainly medium-grained porphyritic mica granite and porphyritic monzonite granite,whereas the late stage intrusions are composed of muscovite granite porphyry and muscovite monzonitic *** are many W-Sn-Mo-Pb-Zn-Cu ores in the contact zone between the batholith and strata,forming an ore-rich belt around the *** on zircon LA-ICP-MS U-Pb ages,the southwestern part of the early stage batholith formed at 228.7 ± 4.1 Ma(MSWD = 2.49),with slightly earlier magmatic activity at 243.0 ± 5.8 Ma(MSWD = 2.62).The Yuntoujie muscovite granite was associated with W-Mo mineralization and has a zircon LA-ICP-MS U-Pb age of 216.8 ± 4.9 Ma(MSWD = 1.44).The Re-Os isochron age of molybdenite from the Yuntoujie W-Mo ore was 216.8 ± 7.5 Ma(MSWD = 11.3).Our new isotope data suggest that the late stage intrusive stocks from the southwestern Miaoershan-Yuechengling batholith were closely associated with W-Mo mineralization from the Indosinian *** new results together with previous isotope data,suggest that South China underwent not only the well-known Yanshanian mineralization event,but also a widespread Indosinian metallogenic event during the Mesozoic ***,South China has a greater potential for Indosinian mineralization than previously thought such that more attention should be given to the Indosinian ore prospecting in South China.

关键词： Re-Os同位素年龄中国南方复杂岩体印支期西南部 LA-ICP-MS 锆石U-Pb年龄矿化

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Unusual tunability of multiferroicity in GdMn_2O_5 by electric field poling far above multiferroic ordering point

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Chinese Physics B 2019年第2期28卷 420-427页

作者： Xiang Li Shuhan Zheng Liman Tian Rui Shi Meifeng Liu Yunlong Xie Lun Yang Nian Zhao Lin Lin Zhibo Yan xiuzhang wang Junming Liu Institute for Advanced Materials Hubei Normal University Laboratory of Solid State Microstructures and Innovative Center of Advanced Microstructures Nanjing University Institute for Advanced Materials South China Normal University

The multiferroicity in the RMn_2O_5 family remains unclear, and less attention has been paid to its dependence on high-temperature(high-T) polarized configuration. Moreover, no consensus on the high-T space group symmetry has been reached so far. In view of this consideration, one may argue that the multiferroicity of RMn_2O_5 in the low-T range depends on the poling sequence starting far above the multiferroic ordering temperature. In this work, we investigate in detail the variation of magnetically induced electric polarization in GdMn_2O_5 and its dependence on electric field poling routine in the high-T range. It is revealed that the multiferroicity does exhibit qualitatively different behaviors if the high-T poling routine changes, indicating the close correlation with the possible high-T polarized state. These emergent phenomena may be qualitatively explained by the co-existence of two low-T polarization components, a scenario that was proposed *** is the component associated with the Mn^(3+)–Mn^(4+)–Mn^(3+) exchange striction that seems to be tightly clamped by the high-T polarized state, and the other is the component associated with the Gd Mn^(3+)–Mn^(4+)–Mn^(3+) exchange striction that is free of the clamping. The present findings may offer a different scheme for the electric control of the multiferroicity in RMn_2O_5.

关键词： multiferroicity GdMn2O5 high-T polarized state exchange striction

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Incommensurate-commensurate magnetic phase transition in double tungstate Li_(2)Co(WO_4)_(2)

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Chinese Physics B 2022年第4期31卷 61-66页

作者： Xiyu Chen Ning Ding Meifeng Liu Tao Zou V.Ovidiu Garlea Jingwen Gong Fei Liu Yunlong Xie Lun Yang Shuhan Zheng xiuzhang wang Shuai Dong TCharlton Jun-Ming Liu Institute for Advanced Materials Hubei Normal UniversityHuangshi 435002China School of Physics Southeast UniversityNanjing 211189China Collaborative Innovation Center of Light Manipulations and Applications Shangdong Normal UniversityJinan 250358China Neutron Scattering Division Oak Ridge National LaboratoryOak RidgeTennessee 37831USA Laboratory of Solid State Microstructures and Innovative Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Magnetic susceptibility,specific heat,and neutron powder diffraction measurements have been performed on polycrystalline Li_(2)Co(WO_4)_(2)*** zero magnetic field,two successive magnetic transitions at T_(N1)~9.4 K and T_(N2)~7.4 K are *** magnetic ordering temperatures gradually decrease as the magnetic field *** diffraction reveals that Li_(2)Co(WO_4)_(2)enters an incommensurate magnetic state with a temperature dependent k between T_(N1)and T_(N2).The magnetic propagation vector locks-in to a commensurate value k=(1/2,1/4,1/4)below T_(N2).The antiferromagnetic structure is refined at 1.7 K with Co2+magnetic moment 2.8(1),μ_B,consistent with our first-principles calculations.

关键词： Li_(2)Co(WO_4)_(2) incommensurate-commensurate magnetic transition

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外延Y_3Fe_5O_(12)薄膜的制备及其磁特性的研究

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功能材料 2018年第10期49卷 94-97页

作者：李少珍王秀章湖北理工学院数理学院湖北黄石435003 湖北师范大学先进研究院湖北黄石435002

利用磁控溅射方法在Gd3Fe5O12衬底上制备外延Y_3Fe_5O_(12)薄膜。在室温300K时,改变腔内氩气压得到不同气压下制备的Y_3Fe_5O_(12)薄膜。样品都在空气中进行后退火处理,退火温度800℃/2h,退火升温速率是180℃/h,降温速率是120℃/h。通... 详细信息

利用磁控溅射方法在Gd3Fe5O12衬底上制备外延Y_3Fe_5O_(12)薄膜。在室温300K时,改变腔内氩气压得到不同气压下制备的Y_3Fe_5O_(12)薄膜。样品都在空气中进行后退火处理,退火温度800℃/2h,退火升温速率是180℃/h,降温速率是120℃/h。通过测试发现薄膜的特性及膜厚等都依赖沉积氩气压PAr,沉积气压为2.394Pa时,样品的磁特性较好。为了能充分利用Y_3Fe_5O_(12)纳米结构特性,利用电子束光刻蚀方法成功制备Y_3Fe_5O_(12)纳米量级结构阵列,分析磁阻尼因子变化。

关键词：铁磁、外延薄膜、磁阻尼因子

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Pt电极上BiFeO_3薄膜的淬火效应

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材料导报 2008年第4期22卷 141-142,145页

作者：王秀章刘红日湖北师范学院物理系黄石435002

用溶胶-凝胶法采用快速退火方法在Pt/Ti/SiO2/Si衬底上制备了BiFeO3(BFO)薄膜。通过淬火冷却与自然冷却的对比,研究了淬火冷却对BiFeO3(BFO)薄膜的结构、形貌及电性能的影响。XRD研究表明淬火未对薄膜的结晶产生显著的影响。扫描电镜研... 详细信息

用溶胶-凝胶法采用快速退火方法在Pt/Ti/SiO2/Si衬底上制备了BiFeO3(BFO)薄膜。通过淬火冷却与自然冷却的对比,研究了淬火冷却对BiFeO3(BFO)薄膜的结构、形貌及电性能的影响。XRD研究表明淬火未对薄膜的结晶产生显著的影响。扫描电镜研究表明淬火导致薄膜表面粗糙度增加并出现了裂纹。铁电性测试表明淬火冷却得到的薄膜,其铁电性得到了增强,同时,淬火使BiFeO3薄膜的漏电流增加。

关键词：铁电薄膜溶胶-凝胶法 BiFeO3(BFO)薄膜淬火

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退火温度对Sol-gel法制备的BiFeO3薄膜结构及电性能的影响

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材料导报 2009年第4期23卷 16-18,35页

作者：王秀章晏伯武刘红日湖北师范学院物理与电子科学学院黄石435002 黄石理工学院计算机学院黄石435003

采用溶胶-凝胶法在ITO/glass衬底上制备了BiFeO3薄膜,退火温度分别为500℃和550℃。实验结果表明,550℃退火的薄膜晶粒较大且不均匀,并有杂相产生,薄膜的漏电流较大,没有得到饱和的电滞回线;而在500℃退火的薄膜晶粒较小且均匀,没有杂... 详细信息

采用溶胶-凝胶法在ITO/glass衬底上制备了BiFeO3薄膜,退火温度分别为500℃和550℃。实验结果表明,550℃退火的薄膜晶粒较大且不均匀,并有杂相产生,薄膜的漏电流较大,没有得到饱和的电滞回线;而在500℃退火的薄膜晶粒较小且均匀,没有杂相产生,相对于550℃退火的薄膜,其漏电流密度降低了约2个数量级,铁电性得到明显增强,剩余极化强度约为40μC/cm2,矫顽场约为75kV/cm,最大的测试电场为130kV/cm。

关键词：铁电薄膜溶胶-凝胶法 BiFeO3薄膜退火温度

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