Electrocatalytic Activity of Tin-Doped Carbon Hollow Spheres
Hollow carbon sphere electrocatalysts were synthesized by combining the hydrothermal and intermittent
microwave heating (IMH) technique. The addition of P123 as surfactant has created huge amount of pores, resulted in the
ultrahigh surface area of 1300 m2 g-1. The formation of rutile SnO2 phase during tin loading over spherical structure has
enhanced the electrocatalytic activity of the materials towards hydrogen and oxygen evolution reaction from water electrolysis
in acidic media. The SEM and TEM images have confirmed the hollow spherical structure with the diameter of 300 – 400 nm.
The XRD pattern and micrographs have shown the formation of SnO2 phase. The nitrogen adsorption isotherm has exhibited
trpical type – I of microporous materials. In the cyclic voltammograms, the peaks for hydrogen and oxygen evolution reactions
are prominent in all the electrocatalysts. Among all the electrocatalysts, 30 wt% Sn/HCS – 6 has shown the best
electrocatalytic activity with 30 and 50 mA.cm-2 of cathodic and anodic peak current density value, respectively.
Index Terms - Hollow Carbon Spheres, Electrocatalysts, Tin, Intermittent microwave heating, Hydrogen and Oxygen