Facile synthesis of CdO/CdFe₂O₄/MWCNT nanocomposite for aqueous hybrid supercapacitor

In the present report, CdO/CdFe₂O₄ nanoflakes are synthesized by simplest co-precipitation process. Prepared CdO/CdFe₂O₄ nanomaterial is investigated by various characterization techniques and discussed. The energy band gaps of 2.91 and 1.96 eV of CdO/CdFe₂O₄ are obtained by UV–visible spectroscopy. Furthermore, CdO/CdFe₂O₄ nanomaterial is used for supercapacitor and, capacitance of 607 F g⁻¹ is received at 1 A g⁻¹. Specific capacitance of CdO/CdFe₂O₄ nanoflakes is found to be higher from CdO (322 F g⁻¹) and CdFe₂O₄ (494 F g⁻¹). Capacitance of CdO/CdFe₂O₄ is further improved by adding the small amount of MWCNTs and, enhanced capacitance of 803 F g⁻¹ is received from CdO/CdFe₂O₄/MWCNT nanocomposite at 1 A g⁻¹. Moreover, hybrid supercapacitor (HSC) is assembled by CdO/CdFe₂O₄/MWCNT and activated carbon (AC). CdO/CdFe₂O₄/MWCNT//AC delivers the high energy density of 32.50 W h kg⁻¹ with the power density of 750 W kg⁻¹. Further, five light-emitting diodes (LEDs), toy motor fan and kitchen timer are functionalized separately by series connected two CdO/CdFe₂O₄/MWCNT//AC hybrid supercapacitors.