Commercial Dacron cloth supported Cu(OH)₂ nanobelt arrays for wearable supercapacitors

Abstract

Commercial Dacron cloth is directly used as a substrate for the growth of Cu(OH)2 nanobelt arrays for application in flexible all-solid-state supercapacitors.

3D Structural Strengthening Urchin‐Like Cu(OH)2‐Based Symmetric Supercapacitors with Adjustable Capacitance

“…Figure a presents CV curves of the electrodes with different lattice structures within a potential window of 0–0.5 V (vs Hg/HgO) at 200 mV s −1 in 6 m KOH aqueous electrolyte. It can be clearly observed that each CV curve displays an indistinct anodic peak and a broad cathodic peak, which are quite different from the ideal rectangular CV curves of traditional electrochemical double‐layer capacitors, revealing a typical pseudocapacitance behavior governed by Faradaic reactions 11a. And these CV curves are very similar to the profiles of previously reported Cu(OH) 2 electrodes 11b,19.…”

“…As depicted in Figure b, XPS pattern of the electro‐oxidized sample for the Cu 2p core level shows two obvious peaks at 933.7 and 953.5 eV, corresponding to a spin–orbit couple of Cu 2p 3/2 and Cu 2p 1/2 . These two distinct peaks together with their shake‐up satellites at 961.6, 942.8, and 940.5 eV are ascribed to the characteristic peaks of d9 Cu 2+ compounds,11b revealing that a certain amount of electroless plated Cu metal has been successfully oxidized into Cu 2+ . These findings are also in reasonable agreement with previous reports 11a.…”

“…These two distinct peaks together with their shake‐up satellites at 961.6, 942.8, and 940.5 eV are ascribed to the characteristic peaks of d9 Cu 2+ compounds,11b revealing that a certain amount of electroless plated Cu metal has been successfully oxidized into Cu 2+ . These findings are also in reasonable agreement with previous reports 11a. In summary, XPS results confirm the formation of Cu(OH) 2 after electro‐oxidation, which are in correspondence with the findings from XRD data.…”

“…By contrast, transition metal hydroxides, oxides, and sulfides could provide much higher electrochemical specific capacity and energy density, attributed to their fast and reversible redox reactions at the electrode surface. Among them, Cu(OH) 2 is a more attractive option because of its particularly attractive features, such as low cost, favorable electrochemical performance, abundance, and easy preparation . Nevertheless, it remains a huge challenge to realize the fabrication of 3D Cu(OH) 2 electrodes with well‐designed 3D substrate architecture and high mass loading.…”

Copper Hydroxide Porous Nanotube Arrays Grown on Copper Foils as High-Performance Integrated Electrodes for Supercapacitors

“…The anodic peaks are not obvious due to the fact that transition between the Cu + and Cu 2+ are not intact . The cathodic peaks are 0.49, 0.48, 0.47, 0.46, 0.45, 0.44 and 0.38 V at the scan rates of 2, 5, 7, 10, 15, 20 and 50 mV s −1 , respectively, elucidating that the reversibility is lost with the increasing of scan rates, due to the polarization arose from the charge transfer of the electrode …”