Graphene oxide enables improved supercapacitors with 1683 C/g capacitance
Researchers from the Shanghai Institute of Technology, Naval University of Engineering and Liaoshen Industries Group have developed a highly porous NiCo₂V₂O₈@GO hollow sphere electrode material that could improve supercapacitor performance. This innovation tackles the persistent challenge of low energy density in supercapacitors, which excel in power delivery and cycle life but lag behind batteries in stored energy.
The team first explored a series of ternary metal vanadates – NiₓCo₃₋ₓV₂O₈, NiₓMn₃₋ₓV₂O₈, and NiₓCu₃₋ₓV₂O₈ (x = 1, 1.5, 2) – to pinpoint optimal metal combinations for electrochemical activity. They then refined NiCo₂V₂O₈@GO via anion exchange on metal glycerolate precursors, followed by annealing to form yolk-double-shell hollow nanospheres coated with graphene oxide (GO). This core-shell design leverages GO’s 2D scaffold to prevent nanoparticle aggregation, boost electrical conductivity, and expand the electrochemically accessible surface area.
Source: https://www.graphene-info.com/graphene-oxide-enables-improved-supercapacitors-1683-cg-capacitance
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