The electrochemical/chemical growth of porous (Ni,Co,Cu)(OH)₂ was reported based on the corrosion behaviors of Ni-Co-Cu films in neutral salt spray. The films prepared by using electrodeposition were ternary solid solution alloys with a simple phase structure, strong texture, nanoscale grains, large microstrain and a large number of crystal defects. The unique microstructures coupled with extensive ion diffusion during the subsequent corrosion process facilitated the formation of ternary hydroxides with uniform and porous nanostructures. The ternary hydroxides composed of Ni-/Co-dominant hydrotalcite-like and Cu-dominant orthorhombic (Ni,Co,Cu)(OH)₂ could be efficiently prepared by motivating the transformation from oxide to hydroxide. The binder-free (Ni,Co,Cu)(OH)₂ electrode exhibited a high specific capacitance of 1738 F g⁻¹ at a current density of 20 A g⁻¹ and decent cycling stability. The electrochemical/chemical growth mode, uniform porous nanostructures and nature of the ternary hydroxides could account for the superior electrochemical performances. This work proposed a simple and green approach to prepare multicomponent hydroxides as novel electrode materials for rechargeable batteries and hybrid supercapacitors.

基于Ni-Co-Cu膜在中性盐雾中的腐蚀行为，报道了多孔（Ni，Co，Cu）（OH）₂的电化学/化学生长。通过电沉积制备的膜是三元固溶体合金，其具有简单的相结构，强的织构，纳米级晶粒，大的微应变和大量的晶体缺陷。独特的微观结构加上随后的腐蚀过程中广泛的离子扩散，促进了具有均匀且多孔纳米结构的三元氢氧化物的形成。通过促进从氧化物到氢氧化物的转变，可以有效地制备由Ni // Co占主导地位的类水滑石和Cu占主导地位的斜方晶系（Ni，Co，Cu）（OH）₂组成的三元氢氧化物。无粘结剂（Ni，Co，Cu）（OH）₂电极在20 A g ^-1的电流密度下表现出1738 F g ^-1的高比电容，并且具有良好的循环稳定性。电化学/化学生长模式，均匀的多孔纳米结构和三元氢氧化物的性质可以解释优异的电化学性能。这项工作提出了一种简单而绿色的方法来制备多组分氢氧化物，作为可再充电电池和混合超级电容器的新型电极材料。