biostudies-literatureLi ZNatural Science Foundation of Guangdong ProvinceNational Natural Science Foundation of ChinaCollege Innovation Team Project of Guangdong ProvinceMajor Projects of Guangdong Education Department for Foundation Research and Applied Research2121https://www.ebi.ac.uk/biostudies/studies/S-EPMC9227449biostudies-literatureUnknown12(12)Designing and modifying nanoporous metal foils to make them suitable for supercapacitor and catalysis is significant but challenging. In this work, Cu_xO nanoflakes have been successfully in situ grown on nanoporous Cu foil via a facile electrooxidation method. A Ga-assisted surface Ga-Cu alloying-dealloying is adopted to realize the formation of a nanoporous Cu layer on the flexible Cu foil. The following electrooxidation, at a constant potential, modifies the nanoporous Cu layer with Cu_xO nanoflakes. The optimum Cu_xO/Cu electrode (O-Cu-2h) delivers the maximum areal capacitance of 0.745 F cm^-2 (410.27 F g^-1) at 0.2 mA cm^-2 and maintains 94.71% of the capacitance after 12,000 cycles. The supercapacitor consisted of the O-Cu-Nanomaterials (Basel, Switzerland)Cu_xO-Modified Nanoporous Cu Foil as a Self-Supporting Electrode for Supercapacitor and Oxygen Evolution Reaction.PMC9227449519011612021KCXTD0422020ZDZX2063 & 2019KZDXM065 & 2019KZDXM0512021A1515011955Li ZHe XLin JZhang CLiang PXin YfalseCu_xO-Modified Nanoporous Cu Foil as a Self-Supporting Electrode for Supercapacitor and Oxygen Evolution Reaction.Designing and modifying nanoporous metal foils to make them suitable for supercapacitor and catalysis is significant but challenging. In this work, Cu_xO nanoflakes have been successfully in situ grown on nanoporous Cu foil via a facile electrooxidation method. A Ga-assisted surface Ga-Cu alloying-dealloying is adopted to realize the formation of a nanoporous Cu layer on the flexible Cu foil. The following electrooxidation, at a constant potential, modifies the nanoporous Cu layer with Cu_xO nanoflakes. The optimum Cu_xO/Cu electrode (O-Cu-2h) delivers the maximum areal capacitance of 0.745 F cm^-2 (410.27 F g^-1) at 0.2 mA cm^-2 and maintains 94.71% of the capacitance after 12,000 cycles. The supercapacitor consisted of the O-Cu-2022-01-01T00:00:00Z2022 Jun2025-04-21T14:16:02.391Z2025-04-21T14:16:02.391ZS-EPMC92274493574546110.3390/nano12122121