Abstract
We successfully decorated SnO2 quantum dots (SQDs) on the surface of spinel cobalt ferrite (CFO) at room temperature by cost-effective method. Pristine CFO and CFO nanocomposites (CFO-Sn1 and CFO-Sn2) were used as an electrocatalyst for methanol oxidation reaction (MOR) and oxygen evolution reaction (OER). CFO-Sn2 led to superior MOR and OER in alkaline media owing to the improved conductivity and higher electrochemically active surface area compared to the pristine CFO and CFO-Sn1. CFO-Sn2 exhibited the highest anodic peak intensity (Ipc) for MOR and significant peak separation upto 4.0 M concentration of MeOH. CFO-Sn2 exhibited the lowest overpotential value of 290 mV at 10 mA cm−2 vs RHE for OER, which was the highest among the electrocatalyst, and a Tafel slope of 85 mV/dec.
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