Anisotropic Nanoporous Nickel Obtained through the Chemical Dealloying of Y2Ni7 for the Comprehension of Anode Surface Chemistry of Ni-MH Batteries
Anisotropic Nanoporous Nickel Obtained through the Chemical Dealloying of Y2Ni7 for the Comprehension of Anode Surface Chemistry of Ni-MH Batteries
复制标题
DOI：
10.1002/celc.201901281
复制
发表时间：
2019-10-01
期刊：
影响因子：
4
通讯作者：
Latroche, Michel
中科院分区：
文献类型：
--
作者：
Madern, Nicolas;Monnier, Judith;Latroche, Michel
首次分离出具有堆叠结构的金属间化合物合金在腐蚀过程中形成的镍层。这种镍层是Y2Ni7在碱性介质中通过腐蚀过程化学脱合金而形成的。这种各向异性的纳米多孔相的形态、化学和结构性质以及其电化学行为都得到了充分的表征。金属相由相互连接的纳米立方镍组成，显示出择优取向和纳米孔。除了使用块状电极的经典方法外，还使用了空腔微电极来进行电化学层的研究。这一全面的表征对于更好地了解MH-Ni电池中金属阳极在循环时的行为并确保更长的寿命具有重要意义。
For the first time, the nickel layer formed during the corrosion of intermetallic alloys with a stacked structure has been isolated. This nickel layer has been produced by chemical dealloying of Y2Ni7 through a corrosion process in alkaline medium. This anisotropic and nanoporous phase has been fully characterized regarding its morphology, chemical and structural properties, as well as its electrochemical behavior. The metallic phase is made of interconnected nanocrystalline cubic nickel, showing preferential orientation and nanopores. A cavity microelectrode has been used in addition to classical methods using bulk electrodes for electrochemical investigations of the layer. This full characterization is of primary importance to better understand the behavior of metallic anodes in Ni-MH batteries upon cycling and to ensure a longer lifetime.