摘要
Customized Co(OH) 2 interface layer designed by electrodeposition. • The NF@[Co] 120 /Mn/[Co] 60 composite electrode integrates "conduction-adhesion-protection" functions. • Achieves high volumetric capacitance and excellent cycling stability. • Provide a novel design strategy for next-generation flexible and wearable energy storage devices. The in-situ synthesized nickel foam(NF)/manganese dioxide(MnO 2 ) electrode shows great promise for flexible supercapacitors owing to its high theoretical capacity, abundance, and eco-friendliness. However, the practical application of MnO 2 is hindered by poor conductivity, significant volume expansion, dissolution in electrolytes, and weak adhesion to smooth NF. To address these challenges, this work leverages the advantages of high conductivity and interface modification offered by Co(OH) 2 to precisely construct a sandwich-structured composite electrode(NF@[Co] 120 /Mn/[Co] 60 ) at the MnO 2 interface layer, which integrates conductive, adhesive, and protective functions. Benefiting from the advanced structure, the composite electrode exhibits outstanding electrochemical performance. NF@[Co] 120 /Mn/[Co] 60 achieves a capacitance of 340.31 F g −1 at 1 mA cm −2 , with a capacitance retention of 196.05 F g −1 when the current density increases to 20 mA cm −2 , and a capacity retention rate of 86.68% after 9000 cycles. Moreover, by utilizing the smooth and continuous macroscopic interface of the outermost Co(OH) 2 nanosheets, we integrated it with hydrogel electrolyte to assemble flexible supercapacitor (NF@[Co] 120 /Mn/[Co] 60 //PAA//AC). This device delivers an energy density of 74.95 Wh kg –1 at a power density of 994.94 W kg –1 and demonstrates excellent mechanical flexibility. This novel structural design provides a new electrode system strategy for the development of flexible wearable energy storage systems. Download: Download high-res image (197KB) Download: Download full-size image
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