Open AccessInsight into Factors Influencing Thermal Oxidation of Iridium Oxide Electrode: Thermostatic Post-Treatment Temperature
Author(s) -
Feifei Huang,
Yi Qin,
Qingrui Wang,
Shuqiang Wang,
Weipeng Wang,
Peng Bi,
Liping Wen,
Hai Chang,
Ying Jin
Publication year - 2022
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ac5f20
Subject(s) - x ray photoelectron spectroscopy , electrode , raman spectroscopy , surface roughness , materials science , analytical chemistry (journal) , oxide , thermal oxidation , surface finish , crystal (programming language) , chemical engineering , chemistry , composite material , metallurgy , optics , chromatography , physics , computer science , engineering , programming language
pH detection of strict environments such as deep sea environment, extremely acid or alkaline environment etc. put forward high requirements for pH monitoring electrode. In this paper, the IrO x electrodes prepared by cyclic thermal oxidation and quenching process (CHQ) went through thermostatic posttreatment process, i.e., heat treatment at the temperature of 400 °C, 500 °C, 600 °C for 0.5 h with furnace cooling to room temperature further. Aiming at filtrating an optimal posttreatment process and improving the comprehensive properties of the IrO x electrodes, the E-pH relationship, potential-time dependence tests, and long-term stability tests were carried out. Further characterizations including surface morphologies, surface roughness, surface crystal qualities, and surface compositions were examined through advanced detection methods. The results indicate that the IrO x electrode went through thermostatic posttreatment at 400 °C has larger surface roughness and relatively smaller cracks, implying the increasement in active surface area for electrode reaction. Optimal percentage of Ir 4+ and Ir 3+ revealed by the X-ray photoelectron spectroscopy (XPS), better crystal quality shown by Raman spectroscopy, relief of tensile stress in the surface film demonstrated by (X-ray diffraction) XRD and Raman could account for the excellent performance of the posttreatment IrO x electrode.