Synthesis and Morphology Control of Nanoporous Cu2O/Cu and Their Application as Electrode Materials for Capacitors

Abstract

In this paper, nanoporous copper (NPC) was prepared by dealloying ZrCuAl metallic glass ribbons with HF acid solutions. The effect of dealloying time on the porous structures and thickness of the obtained NPC films was investigated. It was found that the ligament sizes of the NPC could be tuned in a range from 20 to 300 nm, and the thicknesses of the NPC films from 3.1 to 14.4 μm, with properly selected dealloying times. Furthermore, nanoporous composites made of NPC and nanoporous Cu2O were prepared by oxidizing the NPC with ethanol. The nanoporous composite electrodes exhibited superior charge-discharge performance and would have broad potential applications in flexible high-performance energy storage devices.

Degradation performance and mechanism toward methyl orange via nanoporous copper powders fabricated by dealloying of ZrCuNiAl metallic glassy precursors

“…Secondly, the Zr-Cu-Ni-Al powders were prepared via atomization processing in a close-coupled nozzle ultrasonic atomization system, and the powders with a diameter of about <30 μm were collected and separated by a 500-mesh griddle. On account of Zr element more easily dissolved in diluted HF solution but Cu relatively stable, and many reported works have utilized diluted HF solution to fabricate nanoporous Cu, using Zr-Cu based alloys as the dealloying precursors, such as ZrCuAl [28], ZrCuAg [29], ZrCuNiAl [4,27], ZrCu-FeAl [30]. Then, the chemical dealloying process was performed in 0.2 M HF solution at room temperature for 24 h to synthesize NP-Cu structure, after that the dealloyed powders were rinsed with deionized water and absolute ethyl alcohol.…”

Energy-dense wire-like supercapacitors based on scalable three-dimensional porous metal-graphene oxide skeleton electrodes

“…Nevertheless, electrodes with in situ formed active materials through surface oxidation could accommodate the volume change of active materials during the redox process. 27 Ascribed to the large surface area of a multi-scaled 3D porous structure, the Cu@Ni-GO electrodes exhibited excellent electrochemical performance with an areal capacitance of 4.47 F cm −2 . Asymmetric wire-like supercapacitors were fabricated, achieving a very high energy density of 30.2 mW h cm −3 .…”

CuxO-Modified Nanoporous Cu Foil as a Self-Supporting Electrode for Supercapacitor and Oxygen Evolution Reaction

“…This method could be a facile and powerful technique to fabricate flexible nanoporous Cu foil for various applications. CuO or Cu 2 O oxide layers can easily form on the surface of nanosized Cu, which could act as catalysts or electrodes for supercapacitors [22][23][24][25][26][27][28]. Dong et al applied an electrooxidation method to the Cu foam in an H 2 C 2 O 4 solution to form a Cu 2 O/Cu electrode for the supercapacitors [27].…”