Research articles
ScienceAsia 51S (2025):ID 2025023 1-8 |doi:
10.2306/scienceasia1513-1874.2025.s023
Investigation of oxygen evolution reaction using a co-doped
Ir/Sb-SnO2 as electrocatalytic electrode materials
Supandee Maneeloka,*, Chakkrapong Chaiburib, Chontira Sangsubunc, Pierrot S. Attidekoud
ABSTRACT: Iridium antimony-doped tin oxide (Ir/ATO) is a promising catalytic material for the anodic oxygen
evolution reaction (OER), a significant challenge in clean energy technologies such as energy storage, energy
conversion, and electrolysis. In this study, Ti/Ir/ATO electrodes were fabricated using the dip coating method with
various Ir concentrations at different calcination temperatures. The oxygen evolution reaction was evaluated. The
material properties were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Energy
dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and Cyclic voltammetry (CV). The Ir/ATO
materials exhibit a single-phase tetragonal structure with nano-sized particles ranging from 8.2 to 24 nm as a function
of doping at 550?C. The spherical particles and EDX mapping show uniformly distributed Ir and Sb atoms over tin oxide
with no aggregation. XPS spectra of Ir/ATO calcined at 550?C showed the presence of Sn4+ and both Sb3+ and Sb5+.
The highest Sb3+ peak area of 2.5% Ir/ATO suggests enhanced kinetics due to substitution and increased number of
electrochemically active sites. With regard to OER performance, the CV performed on a 2.5%Ir/ATO catalyst exhibits
a cathodic surface oxide reduction peak around ca. 0.47 V (vs. Ag/AgCl) with a current density of 2.03 mA cm?2 and
a surface oxidation onset around E = 0.8V. Furthermore, an onset potential for the OER can be observed at ca. 1.4 V,
indicating superior OER properties.
Download PDF
Downloads Views
| a |
Department of Occupational Health and Safety, Faculty of Health and Sports Science, Thaksin University,
Phatthalung 93210 Thailand |
| b |
Faculty of Engineering, Thaksin University, Phatthalung Campus, Phatthalung 93210 Thailand |
| c |
Department of Physical Sciences, Faculty of Science and Digital Innovation, Thaksin University,
Phatthalung 93210 Thailand |
| d |
School of Chemistry, University of Birmingham, Birmingham B15 2TT United Kingdom |
* Corresponding author, E-mail: msupandee@tsu.ac.th
Received 30 Nov 2024, Accepted 0 0000
|
