In situ Growth of Cu2O/CuO Nanosheets on Cu Coating Carbon Cloths as a Binder-Free Electrode for Asymmetric Supercapacitors

Abstract

Cu 2 O/CuO nanosheets in-situ grown on Cu-Carbon cloths (Cu-CCs), namely Cu 2 O/CuO@Cu-CCs, are constructed by a simple strategy with electroless copper plating, chemical etching, and thermal dehydration. The as-prepared material is directly used as binder-free electrodes for supercapacitors (SCs). CCs coated with Cu, as the current collector, can effectively promote the charge collection and electron transfer, while the hierarchical Cu 2 O/CuO nanosheets provide massive active sites for fast faradic reactions. The composite electrode exhibits high specific capacitance [1.71 F cm −2 , equivalent to 835.2 F g −1 , at the current density of 10 mA cm −2 (3.57 A g −1 )]. The asymmetric supercapacitor device using Cu 2 O/CuO@Cu-CCs as the positive electrode and activated carbon as the negative electrode, achieves a superior energy density up to 60.26 Wh kg −1 at a power density of 299.73 W kg −1 and an excellent long-term cycling stability (9.65% loss of its initial capacitance after 5,000 cycles). The excellent electrochemical performance is mainly ascribed to the unique hierarchical structure of Cu 2 O/CuO@Cu-CCs, making it attractive as a potential electrode material for high performance SCs.

Dual-Purpose CuFe2O4-rGO-Based Nanocomposite for Asymmetric Flexible Supercapacitors and Catalytic Reduction of Nitroaromatic Derivatives

“…The pseudocapacitive nature of CuFe 2 O 4 has been reported by several researchers. ,, In the alkaline electrolyte system, CuFe 2 O 4 generally shows the Faradaic reactions in the positive potential range, and the redox reactions originate from the intervalence charge transfer between Cu 2+ /Cu + and Fe 3+ /Fe 2+ . The redox reactions can be presented as eqs and . ,− …”

Construction of a Cu-Based Metal–Organic Framework by Employing a Mixed-Ligand Strategy and Its Facile Conversion into Nanofibrous CuO for Electrochemical Energy Storage Applications

“…The supercapacitance performance of nanostructured CuO is compared with other related reports based on various parameters, which indicates the remarkable performance of Cu-MOF-derived CuO, demonstrating a higher specific capacitance with good long-term stability (Table S5). ,,− Hence, the MOF-derived nanostructured CuO can be an encouraging material for electrochemical energy storage because it delivers notable specific capacitance and reveals long-term cyclic stability without utilizing any costly binders/conducting additives.…”

Research Progress on Porous Carbon Supported Metal/Metal Oxide Nanomaterials for Supercapacitor Electrode Applications

“…density of 10 mA cm −2 (3.57 A g −1 )]. 185 In another study, 3D porous gear-like CuO nanostructures on a Cu substrate yielded a C sp of 348 F g −1 . 186 Incorporating pseudocapacitive materials into copper oxides can enhance the low C sp value, especially as an intelligent nanoarchitecture to facilitate the process of charging transfer.…”

“…Wang and his group prepared CuO nanosheet arrays onto the Ni foam surface to get a high C sp of 569 F g –1 ; however, the synthesis route is a relatively complex procedure with a very limited yield. Lately, Cu 2 O/CuO-based mesoporous nanosheets coated on carbon cloths (Cu 2 O/CuO@Cu-CCs) as a binder-free electrode have been prepared by a simple strategy with a C sp of 835.2 F g –1 at a current density of 10 mA cm –2 (3.57 A g –1 )] . In another study, 3D porous gear-like CuO nanostructures on a Cu substrate yielded a C sp of 348 F g –1 .…”