A novel heteropoly compound, containing two kinds of coordinated cations, [K(H2O)2Ni(H2O)6]2, has been synthesized through routine process and characterized by elemental analyses, IR, 51V NMR and single crystal X-ray ...A novel heteropoly compound, containing two kinds of coordinated cations, [K(H2O)2Ni(H2O)6]2, has been synthesized through routine process and characterized by elemental analyses, IR, 51V NMR and single crystal X-ray diffraction. It crystallizes in the triclinic system, space group P1 with a=0.873 82(17) nm, b=1.075 4(2) nm, c=1.111 1(2) nm, α=65.10(3)°, β=75.01(3)°, γ=70.63(3)°, V=0.884 8(3) nm3 and Z=1. The X-ray analysis reveals that the two kinds of coordinated cations are linked by three shared coordinated water molecules, and K+ cations coordinate with ten oxygen atoms: five of which come from V10O286- anion, the other five from water molecules. The title compound exhibits extended 2D array building up of V10O286- groups connected by ten-coordinated K+ cations. The hexahydrated nickel cations Ni(H2O)62+ lie in neat apposition to three adjacent V10O286- clusters. CSD: 413271.展开更多
以Ca_3N_2为前驱体,用高温热解法制备了2D层状结构Ca_2N并用X射线和扫描电镜对Ca_2N的组成、结构和形貌进行了表征。作为钠离子电池新型负极材料,在50 m A/g电流密度充放电,首次放电比容量可达584 m A·h/g,可逆比容量达180 m A...以Ca_3N_2为前驱体,用高温热解法制备了2D层状结构Ca_2N并用X射线和扫描电镜对Ca_2N的组成、结构和形貌进行了表征。作为钠离子电池新型负极材料,在50 m A/g电流密度充放电,首次放电比容量可达584 m A·h/g,可逆比容量达180 m A·h/g。在2000 m A/g大电流密度下,仍有70 m A·h/g。展开更多
文摘A novel heteropoly compound, containing two kinds of coordinated cations, [K(H2O)2Ni(H2O)6]2, has been synthesized through routine process and characterized by elemental analyses, IR, 51V NMR and single crystal X-ray diffraction. It crystallizes in the triclinic system, space group P1 with a=0.873 82(17) nm, b=1.075 4(2) nm, c=1.111 1(2) nm, α=65.10(3)°, β=75.01(3)°, γ=70.63(3)°, V=0.884 8(3) nm3 and Z=1. The X-ray analysis reveals that the two kinds of coordinated cations are linked by three shared coordinated water molecules, and K+ cations coordinate with ten oxygen atoms: five of which come from V10O286- anion, the other five from water molecules. The title compound exhibits extended 2D array building up of V10O286- groups connected by ten-coordinated K+ cations. The hexahydrated nickel cations Ni(H2O)62+ lie in neat apposition to three adjacent V10O286- clusters. CSD: 413271.
文摘以Ca_3N_2为前驱体,用高温热解法制备了2D层状结构Ca_2N并用X射线和扫描电镜对Ca_2N的组成、结构和形貌进行了表征。作为钠离子电池新型负极材料,在50 m A/g电流密度充放电,首次放电比容量可达584 m A·h/g,可逆比容量达180 m A·h/g。在2000 m A/g大电流密度下,仍有70 m A·h/g。
文摘自石墨烯时代以来,具有独特物理、化学和光电特性的二维层状材料(Two-Dimensional Layered Materials,2DLMs)得到了国内外科研人员的广泛关注。2DLMs因其种类的多样化与带隙的层数依赖性,光谱响应范围覆盖了紫外到红外辐射的极宽波段,具有应用于新一代光电探测器件的潜力。此外,2DLMs不受晶格匹配的限制,能以范德瓦尔斯力(Van der Waals,vdWs)与其他维度材料如体材料、纳米线和量子点等结合,制备得到性能独特且优异的复合结构器件。文中概述了几种应用在光电探测器领域的新型2DLMs异质结光电探测器的研究进展,主要包括基于二硒化钨(WSe2)、黑砷磷(AsP)、三硫化铌(NbS3)、二硒化钯(PbSe2)等异质结光电探测器,这些异质结光电探测器在异质结器件结构设计与新型二维半导体工艺技术应用方面做出了创新,在器件增益、结整流比、响应速度与波长探测范围等多个重要器件性能方面获得了突破性的研究成果。同时,文中还简要分析了这类器件研究当前所面临的挑战,并对其未来的发展方向进行了展望。
