Room-Temperature Synthesis of Intermetallic Cu–Zn by an Electrochemically Induced Phase Transformation
Room-Temperature Synthesis of Intermetallic Cu–Zn by an Electrochemically Induced Phase Transformation
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DOI：
10.1021/acs.chemmater.1c01678
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发表时间：
2021-09
影响因子：
8.6
通讯作者：
Yunfei Wang;A. Hall
中科院分区：
文献类型：
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作者：
Yunfei Wang;A. Hall
有序金属间化合物(OIC)是一种从催化到光电子学的有用材料。然而，制备由电阳极金属和后过渡金属组成的OIC纳米材料的通用合成方法仍然是一个巨大的挑战。本文报道了一种由富锌铜合金在常温常压下通过电化学诱导相变制备有序金属间化合物γ-Cu5Zn8或金属间化合物β-CuZn(高温相)的方法。在EIPT过程中，锌通过电化学腐蚀从晶格中溶解出来，启动了晶体向金属间化合物相的重组。ϵ-CuZ4(空间群：P63/MMC)向有序金属间化合物γ-Cu5Z8(空间群：I4̅3M)或金属间化合物β-CuZN(空间群：I4̅3M)的转变受脱合金化过程中使用的电位和电解液的控制。被访问的相由富锌铜合金在水溶液中的热力学稳定性所控制。这些结果奠定了在常温常压下合成金属间化合物纳米材料的关键进展。
Ordered intermetallic compounds (OICs) are useful materials for applications ranging from catalysis to optoelectronics. However, generalizable synthetic methods for preparing OIC nanomaterials composed of an electropositive metal and late transition metal has remained a substantial challenge. Herein, we report a process for synthesizing ordered intermetallic γ-Cu5Zn8or intermetallic β-CuZn (high-temperature phase) from Zn-rich Cu alloys at room temperature and atmospheric pressure by an electrochemically induced phase transformation (EIPT). In the EIPT process, Zn is dissolved from the lattice by electrochemical corrosion, initiating the reorganization of the crystal to an intermetallic phase. The transformation of ϵ-CuZn4(space group:P63/mmc) to ordered intermetallic γ-Cu5Zn8(space group:I4̅3m) or intermetallic β-CuZn (space group:I4̅3m) is controlled by the potential and electrolyte used during dealloying. The phases that were accessed was gated by the thermodynamic stability of Zn-rich Cu alloys in aqueous electrolytes. These results have established a key development in the synthesis of intermetallic nanomaterials at room temperature and atmospheric pressure.