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首页> 外文期刊>Journal of power sources >Structural-electrochemical relations in the aqueous copper hexacyanoferrate-zinc system examined by synchrotron X-ray diffraction
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Structural-electrochemical relations in the aqueous copper hexacyanoferrate-zinc system examined by synchrotron X-ray diffraction

机译：同步加速器X射线衍射研究六水合高铁酸铜锌水溶液中的结构电化学关系

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摘要

The storage process of Zn2+ in the Prussian blue analogue (PBA) copper hexacyanoferrate (Cu[Fe(CN)(6)](2/3)-nH(2) O-CuHCF) framework structure in a context of rechargeable aqueous batteries is examined by means of in operando synchrotron X-ray diffraction. Via sequential unit-cell parameter refinements of time-resolved diffraction data, it is revealed that the step-profile of the cell output voltage curves during repeated electrochemical insertion and removal of Zn2+ in the CuHCF host structure is associated with a non-linear contraction and expansion of the unit-cell in the range 0.36 < x < 1.32 for Znx/3Cu[Fe(CN)(6)](2/3)-nH(2)O. For a high insertion cation content there is no apparent change in the unit-cell contraction. Furthermore, a structural analysis with respect to the occupancies of possible Zn2+ sites suggests that the Fe(CN)(6) vacancies within the CuHCF framework play an important role in the structural-electrochemical behavior of this particular system. More specifically, it is observed that Zn2+ swaps position during electrochemical cycling, hopping between cavity sites to vacant ferricyanide sites. (C) 2017 The Authors. Published by Elsevier B.V.
机译：在可充电水性电池中，普鲁士蓝类似物（PBA）六氰合铁酸铜（Cu [Fe（CN）（6）]（2/3）-nH（2）O-CuHCF）框架结构中Zn2 +的存储过程为通过同步加速器X射线衍射进行检查。通过时间分辨衍射数据的单位晶胞参数顺序优化，发现在CuHCF主体结构中重复电化学插入和去除Zn2 +过程中，电池输出电压曲线的阶跃曲线与非线性收缩和对于Znx / 3Cu [Fe（CN）（6）]（2/3）-nH（2）O，晶胞的扩展范围为0.36

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