Moonooswamy Kevin Radakishna, Es-Souni Mohammed
Currently with Toronto Metropolitan University, Victoria Street 350, Toronto, ON M5B, Canada.
Formerly with Kiel University of Applied Sciences, Grenzstrasse 3, 24149 Kiel, Germany.
Micromachines (Basel). 2023 Aug 20;14(8):1644. doi: 10.3390/mi14081644.
Nickel hydroxide β-Ni(OH) nanolamellae with high aspect ratios were grown via chemical bath deposition (CBD) on both smooth and textured nickel foil. Depending on bath composition and/or the presence of an additive, thin foam-like nanolamellae to stacked lamellae were obtained. The used CBD method is highly cost-effective, as it is faster and requires less chemicals than typical hydrothermal methods, and it is readily implementable for large-scale production. The influence of surface texture on the final morphology and its effect on capacitive performance was investigated. Herein, we show how subtle changes in the concentration can drastically influence the morphology, which, in turn, drastically impacts the supercapacitive performance of the electrode. Also, the use of a textured surface significantly impacts the morphology, with vastly better cycling performance than samples made on a relatively smooth substrate. The measured specific capacitance values of the best sample were 1961 Fg at 5 mVs and 1998 Fg at 1 Ag under potentiostatic and galvanostatic conditions, respectively. This sample also retained 100% of its initial specific capacitance when discharged at a very high current density of 40 Ag. These values are substantially enhanced compared to previously reported data using a nearly analogous method (CBD with higher reagent conc.), with our method, cost-wise, offering economic advantages relative to results obtained with similar materials and other methods (e.g., hydrothermal).
通过化学浴沉积（CBD）在光滑和有纹理的镍箔上生长出了具有高纵横比的氢氧化镍β-Ni(OH)纳米薄片。根据浴液组成和/或添加剂的存在情况，可获得薄的泡沫状纳米薄片到堆叠薄片。所使用的CBD方法具有很高的成本效益，因为它比典型的水热法更快且所需化学试剂更少，并且易于大规模生产。研究了表面纹理对最终形态的影响及其对电容性能的作用。在此，我们展示了浓度的细微变化如何能极大地影响形态，进而极大地影响电极的超级电容性能。此外，使用有纹理的表面会显著影响形态，其循环性能比在相对光滑的基底上制备的样品要好得多。在恒电位和恒电流条件下，最佳样品的测量比电容值分别在5 mV/s时为1961 F/g和在1 A/g时为1998 F/g。该样品在40 A/g的非常高电流密度下放电时也保留了其初始比电容的100%。与先前使用几乎类似方法（试剂浓度更高的CBD）报道的数据相比，这些值有了显著提高，从成本角度来看，我们的方法相对于使用类似材料和其他方法（如水热法）获得的结果具有经济优势。
