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Microstructural regulation and interfacial electronic coupling in spinel CuCo2O4/MWCNT hybrids for enhanced charge-storage kinetics.

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Title: Microstructural regulation and interfacial electronic coupling in spinel CuCo2O4/MWCNT hybrids for enhanced charge-storage kinetics.
Authors: Ramakrishna Kumar, AB1 (AUTHOR), Suriya, B.1 (AUTHOR), Muniraj, S.1 (AUTHOR) smuniraj@rkmvc.ac.in
Source: Materials Science & Engineering: B. Oct2026, Vol. 332, pN.PAG-N.PAG. 1p.
Subjects: Copper compounds, Carbon nanotubes, Energy storage equipment, Cobalt compounds, Supercapacitors, Nanostructures, Spinel group
Abstract: Achieving simultaneous enhancement of energy density, rate capability, and cycling stability remains a key challenge for pseudocapacitive materials. In this work, a CTAB-assisted hydrothermal strategy was employed to regulate the microstructure of spinel CuCo 2 O 4 through controlled nanocube formation, followed by integration with multiwalled carbon nanotubes (MWCNTs). The surfactant-directed growth yields size-regulated nanocubes with reduced agglomeration, thereby shortening ion-transport pathways. Coupling with the conductive MWCNT network establishes improved interfacial contact and continuous electron-transport channels. Kinetic analysis indicates a transition from diffusion-dominated charge storage in pristine CuCo 2 O 4 to predominantly surface-controlled behavior in the CuCo 2 O 4 /MWCNT hybrid, accompanied by reduced charge-transfer resistance. The optimized hybrid electrode delivers a specific capacitance of 2205 F g−1 at 1 A g−1 with 97% retention over 10,000 cycles. An assembled asymmetric device operating within 1.6 V achieves an energy density of 40.37 Wh kg−1 at 800 W kg−1. These findings demonstrate that microstructural regulation combined with interfacial electronic coupling effectively modulates charge-storage kinetics in spinel oxide–carbon hybrid systems. [Display omitted] • CTAB assisted CuCo 2 O 4 nanocubes with PPy and MWCNTs hybrid electrodes. • MWCNT framework enhances surface area, porosity, and ion-accessible pathways. • CuCo 2 O 4 /MW electrode delivers 2205 F g−1 at 1 A g−1 with excellent rate capability. • Outstanding cycling stability of 97% retention after 10,000 cycles. • ASC device achieves 40.37 Wh kg−1 at 501.39 W kg−1 with high long-term durability. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Achieving simultaneous enhancement of energy density, rate capability, and cycling stability remains a key challenge for pseudocapacitive materials. In this work, a CTAB-assisted hydrothermal strategy was employed to regulate the microstructure of spinel CuCo 2 O 4 through controlled nanocube formation, followed by integration with multiwalled carbon nanotubes (MWCNTs). The surfactant-directed growth yields size-regulated nanocubes with reduced agglomeration, thereby shortening ion-transport pathways. Coupling with the conductive MWCNT network establishes improved interfacial contact and continuous electron-transport channels. Kinetic analysis indicates a transition from diffusion-dominated charge storage in pristine CuCo 2 O 4 to predominantly surface-controlled behavior in the CuCo 2 O 4 /MWCNT hybrid, accompanied by reduced charge-transfer resistance. The optimized hybrid electrode delivers a specific capacitance of 2205 F g−1 at 1 A g−1 with 97% retention over 10,000 cycles. An assembled asymmetric device operating within 1.6 V achieves an energy density of 40.37 Wh kg−1 at 800 W kg−1. These findings demonstrate that microstructural regulation combined with interfacial electronic coupling effectively modulates charge-storage kinetics in spinel oxide–carbon hybrid systems. [Display omitted] • CTAB assisted CuCo 2 O 4 nanocubes with PPy and MWCNTs hybrid electrodes. • MWCNT framework enhances surface area, porosity, and ion-accessible pathways. • CuCo 2 O 4 /MW electrode delivers 2205 F g−1 at 1 A g−1 with excellent rate capability. • Outstanding cycling stability of 97% retention after 10,000 cycles. • ASC device achieves 40.37 Wh kg−1 at 501.39 W kg−1 with high long-term durability. [ABSTRACT FROM AUTHOR]
ISSN:09215107
DOI:10.1016/j.mseb.2026.119665