Conference Name: 2023 Taiwan International Conference on Catalysis (TICC-2023)

Award: Electrocatalyst-Honorable Oral Presentation Award

Title: Application of Carbon Spheres in Electrocatalytic Iodide Oxidation Reaction

Abstract:

In this experiment, the iodide oxidation reaction (IOR) was used to replace the oxygen evolution reaction (OER) at the anode of the traditional water electrolysis. Through the relatively low oxidation potential of IOR than OER, the overall hydrogen production has the advantage of lower energy consumption and produces more economically valuable iodine in addition to hydrogen. The catalyst used in this experiment is non-metallic carbon spheres (CS) derived from glucose. Furthermore, a series of carbon-based metal-free catalysts (CMFCs) are developed by doping or changing the carbonization temperature. We demonstrate a carbon-based electrode for IOR with excellent tolerance to acidic conditions, structural stability, and sustainability. The materials were examined by scanning electron microscope (SEM), Raman spectroscopy, soft X-ray absorption spectroscopy (XAS), X-ray photoelectron spectroscopy (XPS), etc. In the Raman results, it can be found that the doping of elements can effectively change the I_D/I_G, and it can also be seen from the elemental analysis that only a small amount of sulfur can be doped and can effectively increase the activity. In terms of electrochemical performance, the catalyst with 1 wt% sulfur doping (2SCS/TF) has the best activity performance, with an onset potential of 0.61 V and a potential as low as 0.64 V at 10 mA/cm², which is significantly more efficient than OER. In a 72-hour stability test, the sulfur-doped carbon spheres can operate continuously at a constant current of 10 mA/cm², with a decay of only 9%.