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Graphene Oxide Enables Improved Supercapacitors with 1683 C/G Capacitance

Researchers from Shanghai Institute of Technology and partners have created a highly porous NiCo₂V₂O₈@GO hollow‑sphere electrode that dramatically improves supercapacitor performance. The yolk‑double‑shell architecture, coated with graphene oxide, delivers a specific capacitance of 1683 C·g⁻¹ at 1 A·g⁻¹ and retains 87% at 20 A·g⁻¹. In a symmetric device the material achieves 52.5 Wh·kg⁻¹ energy density while maintaining 90.8% capacity after 5,000 cycles. The work addresses the long‑standing energy‑density gap between supercapacitors and batteries.