The durability of the thermally decomposed IrO2-Ta2O5 coated titanium anode in a sulfate solution

Abstract

In this work, series of IrO 2 -Ta 2 O 5 anodes were investigated. The catalytic activity towards oxygen evolution reaction (OER) of these anodes are determined by calcination temperature, coating loading (coating thickness), pretreatment of titanium substrate and coating method. The difference in OER performance

Pilot-Plant Production of High-Performance Silicon Nanowires by Molten Salt Electrolysis of Silica

“…Molten salt electrolysis of solid oxides (the FFC Cambridge Process) represents a breakthrough in production of refractory metals and special materials with a high melting point. − In the typical FFC Cambridge Process, the solid oxides are used as the cathode and directly reduced in molten salt at about 500–1000 °C with a dc power under inert atmosphere. Successful efforts have been made for the preparation of various pure metals and alloys in laboratories, such as Ti, Ta, Si, Hf, U, Tb, Y, Nb–Al, Ni–Zn, Ta–Nb, SiC, TiC, and HfC. − In order to prepare silicon by molten salt electrolysis, different kinds of SiO 2 were chosen as raw materials because of their availability and abundant reserves in the earth. The Nohira group − succeeded in preparation of amorphous Si and microcrystalline Si by reducing quartz or SiO 2 granules.…”

High-Performance Ti/IrO2–RhOx–Ta2O5Electrodes for Polarity Reversal Applications

“…The electrodes were weighed before and after coating. Generally, coating with a high oxide load can improve the service lifetimes of electrodes, , but excessive oxide loads can accelerate coating detachment. , Referencing the optimal loads from the literature, − the total oxide load of the prepared electrodes was approximately 30 g m –2 .…”

Electrochemical Properties of Ti/SnO2-Sb-Ir Electrodes Doped with a Low Iridium Content for the Oxygen Evolution Reaction in an Acidic Environment

“…Xu et al reported that deactivation of Ti/IrO 2 −Ta 2 O 5 electrodes in the sulfuric acid media mainly resulted from the change in chemical composition and the subsequent passivation of the titanium substrate. 32 In recent years, Ti/SnO 2 -Sb electrodes have attracted great attention due to their potential electrocatalytic performances, 33−35 but their short service life and poor catalytic activity in an acidic solution limit their application as the anode for the OER. 36 Many researchers have proved that doping with different elements is much efficient to change the catalytic activity and stability of the electrode.…”

“…15,29 The formation of solid solution facilitated the improvement of the compactness and stability of this electrode. 28,32 Polarization Curves and Cyclic Voltammetry. The LSV curves of the electrodes are shown in Figure 3a.…”

“…Ye et al prepared IrO 2 –MnO 2 double component coatings by thermal decomposition, and the results showed that the electrode with 30 mol % MnO 2 had the highest service life in H 2 SO 4 solution . Up to now, the Ti/IrO 2 –Ta 2 O 5 electrode (70 mol % IrO 2 ) is regarded as the best electrocatalyst for the OER. ,− To further improve the electrochemical performance of MMO anodes, a series of studies focus on getting insights into the deactivation mechanism of the electrode. − Thus far, it has been reported that deactivation of the MMO electrodes is closely related to their structure and composition. Xu et al reported that deactivation of Ti/IrO 2 –Ta 2 O 5 electrodes in the sulfuric acid media mainly resulted from the change in chemical composition and the subsequent passivation of the titanium substrate …”