From carbon nanotubes to functional graphene nanoribbons for high performance supercapacitors
Diamond and Related Materials(2024)
摘要
Graphene nanoribbons (GNRs) have great application potential as electrode materials for supercapacitors because of their edge-enriched active surface area, excellent conductivity and unique structure. Here, functional GNRs were prepared by the oxidation unzipping of carbon nanotubes (CNTs) with followed low-temperature treatment. Benefiting from the unique one-dimensional structure, a large number of oxygen functional groups (14.41 at.%), and superior specific surface area (184.44 m2 g−1), the optimized GNR-200 electrode achieves a high specific capacitance of 225.9 F g−1 at 0.5 A g−1, which is five times better than that of pure CNTs (39.6 F g−1). Most importantly, the assembled GNR-200//GNR-200 symmetric supercapacitor delivers an energy density of 15.52 Wh kg−1 and good electrochemical stability with the capacitance retention of 92.85 % after 20,000 cycles.
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关键词
Carbon nanotubes,Graphene nanoribbons,Supercapacitors,Energy density
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