Synthesis and surface chemistry modulation of CoCe2O4-MoTe2 composite grown on carbon paper electrode for asymmetric supercapacitor and electrochemical sensing

Abstract

To meet future energy demands and financial obstacles, it is imperative to develop cutting-edge materials with remarkable qualities for energy storage and sensor applications. Herein, the cerium-doped cobalt oxide (CoCe₂O₄) was hydrothermally synthesized and mixed with molybdenum ditelluride (MoTe₂) nanoflakes, which were obtained from bulk MoTe₂ through sonication. Applications in electrochemical sensing and energy storage were investigated for the resultant CoCe₂O₄-MoTe₂ composite. For supercapacitors (SCs), an asymmetric device configuration was used, with a composite material functioning as the positive electrode and activated carbon (AC) as the negative electrode. The resultant device showed an impressive 1543.3 W kg⁻¹ power density, an energy density of 54.4 Wh kg⁻¹, a capacity retention of 96.0 % after 5000 cycles, and a 245.2C/g specific capacity at 1.5 A/g. Furthermore, hydrogen peroxide (H₂O₂) was also found in breast cancer cells using the composite device. These cells may include H₂O₂, which can cause oxidative stress, damaging cells and modifying DNA, speeding up the onset of cancer. These findings suggest that the CoCe₂O₄-MoTe₂ composite is a good choice for effective electrochemical sensors and high-performance SCs.