Charge storage, electrocatalytic and sensing activities of nest-like nanostructured Co₃O₄

详细信息    查看全文

• 作者：G. Rajeshkhanna ; Ediga Umeshbabu ; G. Ranga Rao ; ^{grrao@iitm.ac.in" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Co3O4 ; Supercapacitor ; Electrooxidation ; Glucose sensor
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：1 February 2017
• 年：2017
• 卷：487
• 期：Complete
• 页码：20-30
• 全文大小：3568 K

文摘

We synthesized nanostructured Co₃O₄ samples using anionic (SDS), cationic (CTAB) and nonionic (Triton X-100) surfactant molecules in hydrothermal conditions and subsequent calcination. This approach facilitates the synthesis of porous Co₃O₄ material with bundle-like-sheet, nest-like and flake-like morphologies with specific surface areas in the range of 50–77 m² g⁻¹. Among these materials, the nest-like nanostructured Co₃O₄ material has unique pore architecture, larger pore volume, low solution and charge transfer resistance, and found to be an active material for charge storage, electrocatalytic and sensing applications. The specific capacitance value of the nest-like Co₃O₄ is 404 F g⁻¹ at a current density of 2 A g⁻¹ with 80% specific capacitance retention. The electrocatalytic oxidation of methanol occurs at lower onset potential on this material with good electrochemical stability. It has good sensing ability for glucose with high sensitivity of 929 μA cm⁻² mM⁻¹, fast response time of ∼0.5 s and detection limit as low as ∼1 μM. These results show that the nest-like nanostructured Co₃O₄ material is a versatile candidate for various applications.