Performance of titanium oxynitrides in the electrocatalytic oxygen evolution reaction

Ir/TiONx/C high-performance oxygen evolution reaction nanocomposite electrocatalysts in acidic media: synthesis, characterization and electrochemical benchmarking protocol

“…In addition, the support without Ir is shown. Interestingly no activity was recorded, which is in contradiction to some reports showing OER activity of TiON x [54]. The 2.6 times higher activity at 1.6 V (6.61 mA/μg Ir and 2.54 mA/μg Ir for our material and the benchmark, respectively) is associated with the better dispersion and thus better utilization of Ir on the high-surface-area support.…”

Enhanced Lifetime Cathode for Alkaline Electrolysis Using Standard Commercial Titanium Nitride Coatings

“…Cyclic voltammetry experiments revealed that the TiN coating cannot be employed as an anode, even for brief periods, which is in agreement with previous findings [16,17]. The positive electric potential caused the coating to change rapidly from the original gold colour to orange-brown in just a few tens of seconds, accompanied by the loss of the great majority of the electrical conductivity.…”

“…Since XPS is an extremely surface-sensitive analytical technique, examining exclusively the top ~10 nm, it is possible to use an ion beam to mill into the surface, and thereby obtain depth profiling information, the results of which are as shown in Figure 12. Here the numbers 1 to 9 refer to The fitting indicates the presence of three separate components within the overall XPS signal, which are accepted to correspond to the presence of titanium nitride and oxide [10,21], as well as oxynitride [17,20], as indicated. Given the positioning of the remaining component in Figure 10 (at 458 eV), it is clear that after even brief use as an anode, the surface layers of the coating lost all traces of nitrogen and became oxidised titanium.…”

Towards Stable and Conductive Titanium Oxynitride High‐Surface‐Area Support for Iridium Nanoparticles as Oxygen Evolution Reaction Electrocatalyst

“…[6] Importantly, the activity of blank TiON x substrates (without Ir catalyst) was found negligible (see Figure S9 in the Supporting Information), which is in contrast with some recent reports on the same material where initial cycles exhibited significant faradaic currents the origin of which, however, is still not completely clear. [27] After initial OER activity measurements, the materials were tested for electrochemical stability. For this purpose, a 5 h galvanostatic polarization at 0.1 A mg Ir À 1 was applied ( Figure S10 in the Supporting Information).…”