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首页> 外文期刊>Crystal growth & design >Crystal Growth of Bimetallic Oxides CuMnO2 with Tailored Valence States for Optimum Electrochemical Energy Storage
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Crystal Growth of Bimetallic Oxides CuMnO2 with Tailored Valence States for Optimum Electrochemical Energy Storage

机译：双金属氧化物玉米氏乳房生长，具有定制价位态，用于最佳电化学储存

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摘要

Bimetallic oxides ABO(x) (x = 2, 3, and 4) with multiple lattice sites have shown numerous properties, blossoming into diverse applications, while regulating the valence state at the A or B site usually causes a dramatic change in the crystal structure, giving rise to uncertainties in comprehending the structure property relationships. Herein, we synthesized bimetallic layered crednerite CuMnO2 with double-coordinate Cu cations at the A site and hexa-coordinate Mn cations at the B site via a cetyltrimethylammonium bromide (CTAB) modified hydrothermal method. By controlling the crystal growth temperature, valence states tailoring was implemented along with the stabilization of the monoclinic layered structure. The regulation process was followed by morphology changes of the CuMnO2 crystal in a sequence: triangular sheets (140 degrees C), nanowires (160 degrees C), hexagonal prisms (180 degrees C), and octahedrons (over 200 degrees C). Interestingly, the oxidation states of Cu2+ and Mn2+ were found for triangular sheets, which transformed to the mixed valency Cu+/Cu2+ and Mn3+/Mn2+ for nanowires, and then to the dominant Cu+ and Mn3+ oxidation states for hexagonal prisms and octahedrons. Among all morphologies, nanowires showed a higher aspect ratio, preferentially growing along the (002) plane, which when first applied to a supercapacitor, exhibited the highest specific capacitance of 921 F/g at the current density of 1 A/g. The synergistic effect between the special redox equilibrium and controlled one-dimensional crystal architecture is uncovered to optimize the electrochemical energy storage. The methodology reported in this work creates a new path of functional bimetallic oxides ABO(x) with tailored valence states, controllable crystal growth, and stable crystal structure for optimum energy storage applications.
机译：具有多个晶格部位的双金属氧化物（x）（x = 2,3和4）已经显示出多种性质，呈现为不同的应用，同时调节A或B网站的价状态通常会导致晶体结构的显着变化，引起了理解结构性质关系的不确定性。在此，我们通过十六烷基三甲基溴化铵（CTAB）改性水热法在B位点和六核坐标MN阳离子的双坐标Cu阳离子合成双坐标Cu阳离子。通过控制晶体生长温度，随着单斜晶层结构的稳定，实现了价级纵向。在序列中的Cumno2晶体的形态变化之后：三角形片（140℃），纳米线（160℃），六边形棱镜（180℃）和八面体（超过200℃）。有趣的是，发现Cu2 +和Mn2 +的氧化状态用于三角形片材，其转化为纳米线的混合桂+ / Cu2 +和Mn3 + / Mn2 +，然后用于六边形棱镜和八面体的显性Cu +和Mn3 +氧化态。在所有形态中，纳米线显示较高的纵横比，优先沿（002）平面延长，当首先施加到超级电容器时，在电流密度为1A / g时表现出921f / g的最高比电容。揭示特殊氧化还原平衡和控制一维晶体架构之间的协同效应以优化电化学能量存储。本作作品中报告的方法创建了功能性双金属氧化物ABO（X）的新路径，具有定制的价状态，可控的晶体生长和稳定的晶体结构，以获得最佳的能量存储应用。

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  • 来源
    《Crystal growth & design》 |2018年第10期|共10页
  • 作者

    Fu Sixian; Li Liping; Jing Yuancheng; Zhang Yuelan; Wang Xiyang; Fang Shaofan; Wang Jianghao; Li Guangshe;

  • 作者单位

    Jilin Univ Coll Chem State Key Lab Inorgan Synth &

    Preparat Chem Changchun 130012 Jilin Peoples R China;

    Jilin Univ Coll Chem State Key Lab Inorgan Synth &

    Preparat Chem Changchun 130012 Jilin Peoples R China;

    Jilin Univ Coll Chem State Key Lab Inorgan Synth &

    Preparat Chem Changchun 130012 Jilin Peoples R China;

    Jilin Univ Coll Chem State Key Lab Inorgan Synth &

    Preparat Chem Changchun 130012 Jilin Peoples R China;

    Jilin Univ Coll Chem State Key Lab Inorgan Synth &

    Preparat Chem Changchun 130012 Jilin Peoples R China;

    Chinese Acad Sci Fujian Inst Res Struct Matter Fuzhou 350002 Fujian Peoples R China;

    Chinese Acad Sci Fujian Inst Res Struct Matter Fuzhou 350002 Fujian Peoples R China;

    Jilin Univ Coll Chem State Key Lab Inorgan Synth &

    Preparat Chem Changchun 130012 Jilin Peoples R China;

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  • 正文语种 eng
  • 中图分类 晶体学;
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