材料科学
镍
铜
循环伏安法
介电谱
超级电容器
氧化镍
X射线光电子能谱
复合数
氧化铜
化学工程
氧化物
扫描电子显微镜
复合材料
电化学
冶金
电极
化学
物理化学
工程类
作者
Namachivayam Karthik,Thomas Nesakumar Jebakumar Immanuel Edison,Mathur Gopalakrishnan Sethuraman,Yong Rok Lee
标识
DOI:10.1016/j.apsusc.2016.11.123
摘要
Copper/nickel oxide composite foam (Cu/Ni) with petal array-like textures were successfully fabricated via a facile sonochemical approach, and its applications as a pseudocapacitive material for energy storage were examined. The nickel foam was immersed into a mixture of copper chloride (CuCl2) and hydrochloric acid (HCl) and subsequently sonicated for 30 min at 60 °C. As a result of galvanic replacement, nickel was oxidized while copper was reduced, and the walls of the nickel foam were coated with copper particles. Studies using field emission scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopic analyses confirmed the morphology and chemical structure of the as-obtained Cu/Ni oxide composite foam. The supercapacitive performance of the as-fabricated Cu/Ni oxide composite foam was evaluated in 2 M KOH by employing cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy analyses. Cyclic voltammograms revealed that the Cu/Ni oxide composite foam exhibited pseudocapacitive behavior and delivered a high specific capacitance of 1773 F g−1 at a scan rate of 5 mV s−1. This improvement may be attributed to the morphology, surface functionalization with heteroatoms, hydrogen evolution, and high conductivity, along with the low resistance due to short path lengths for electron transportation.
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