Facile Synthesis of Superthin Co₃O₄ Porous Nanoflake for Stable Electrochemical Supercapacitor

Abstract

Superthin Co3O4 porous nanoflake was synthesized via a simple natural biomembrane support system at a mild reaction condition. Due to its high BET specific surface area (125 m2 g−1) and superthin porous nanoflake structure, the as‐obtained sample exhibits a remarkable electrochemical performance, including high specific capacitance (448 F g−1) and excellent electrochemical stability (94% capacitance retention from 0.5 A g−1 up to 10 A g−1).

Reviews and Prospectives of Co3O4‐Based Nanomaterials for Supercapacitor Application

“…The obtained Co 3 O 4 nanowire shows high specific capacitance (978 F g −1 at 0.5 A g −1 ). Li et al . synthesised ultra‐thin Co 3 O 4 porous nanoscale using a simple natural biofilm supporting system at room temperature, which delivers high specific surface area of 125 m 2 g −1 .…”

Recent Progress in Co3O4‐Based Nanomaterials for Supercapacitors

“…prepared the ultrathin porous Co 3 O 4 nanosheets with specific surface area of 125 m 2 /g by using biomass eggshell membrane (ESM) as template. ESM has a three‐dimensional large‐hole network structure, and the obtained ultra‐thin Co 3 O 4 porous nanosheet has a specific capacitance of 448 F/g at 0.5 A/g, and has good doubling ability (when the current density increases to 10 A/g, the capacitance retention rate is 94%) [29] . Similarly, Umar et al.…”

“…ESM has a three-dimensional large-hole network structure, and the obtained ultra-thin Co 3 O 4 porous nanosheet has a specific capacitance of 448 F/g at 0.5 A/g, and has good doubling ability (when the current density increases to 10 A/g, the capacitance retention rate is 94%). [29] Similarly, Umar et al prepared porous Co 3 O 4 nanosheets with upright pores by simple hydrothermal method. Co 3 O 4 nanomaterial has excellent electrochemical performance.…”

Structural, Spectral, and Electrochemical Investigations of a Nitrogen‐Doped N‐rGO/MgCo2O4 Nanocomposite for Supercapacitor Applications

“…Li et al. researched, a simple natural biomembrane used to create a superthin Co 3 O 4 porous nanoflake with higher surface area, and it possessed a specific capacitance of 448 Fg −1 at 0.5 A g −1 [47] . Meher et al.…”

“…[46] Li et al researched, a simple natural biomembrane used to create a superthin Co 3 O 4 porous nanoflake with higher surface area, and it possessed a specific capacitance of 448 Fg À 1 at 0.5 A g À 1 . [47] Meher et al demonstrated hydrothermal grown an ultra-layered morphology Co 3 O 4 with a 548 F g À 1 specific capacitance at 8 A g À 1 current density. [48] Similarly, Co(OH) 2 nanomaterials suffer with lower specific capacitance than the theoretical values.…”