Abstract
Understanding the role of defects is important due to its influence on electrical and optical properties of SnO2. This study reports the role of oxygen defects in SnO2 quantum dots decorated in carbon paper for an improved electron transfer process in electrochemical applications. A simple and cost-effective chemical route for preparation of a SnO2-decorated carbon paper electrode is described. The pseudo-capacitance property of SnO2nano-materials allowed strong improvement in capacitance value compared to pristine carbon paper. Transmission electron microscopy, Raman and photoluminescence studies reveal the presence of ultra-small SnO2 nanoparticles with defects related to prevalent oxygen vacancies. Electron paramagnetic resonance measurement indicates presence of singly charged defect in diamagnetic SnO2. Temperature-dependent photoluminescence, vibrational studies and electron energy loss spectroscopy provide further evidence for shallow in-plane oxygen defects in the SnO2 quantum dots, while impedance measurement discloses their significance in the electrochemical hybrid structure.
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