Electrochemical comparison between IrO2 prepared by thermal treatment of iridium metal and IrO2 prepared by thermal decomposition of H2IrCl6 solution

Electrocatalytic Oxygen Evolution on Iridium Oxide: Uncovering Catalyst-Substrate Interactions and Active Iridium Oxide Species

“…Tafel slopes in the range of 40 to 60 mV dec -1 were observed for IrOFs calcined at and below 450°C, common for Ir oxides (5)(6)(7)32). Notably, an unusually large Tafel slope of 72 mV dec The amorphous oxy-hydroxide formed at low calcination temperatures provides a higher OER activity than the crystalline Ir oxide Hence, a higher structural flexibility seems to be beneficial for the OER performance together with the lower redox stability observed in TPR for the amorphous hydroxide.…”

“…(3) Therefore, Ir oxide constitutes, together with Ru oxide, the common active component in PEM anode catalysts. (1) Although Ir-and Ru oxide have been extensively studied during the past decades (3)(4)(5)(6)(7)(8)(9)(10), the relationship between catalyst structure and composition on the one hand, and the OER reactivity on the other hand has remained unclear. Gottesfeld et.…”

Electrochemical study of Ir–Sn–Sb–O materials as catalyst-supports for the oxygen evolution reaction

“…Mixed oxides materials were prepared by a conventional thermal decomposition method as follows [9,[20][21][22]. A 0.25 M solution of metal precursors based on H 2 IrCl 6 , SnCl 4 Á5H 2 O and SbCl 3 (Aldrich) was prepared in pure ethanol.…”

“…These mixtures have been typically obtained by thermal decomposition of the corresponding metal salts onto plates of titanium, and a significant increase in surface area and surface charge of the mixed oxide compared with pure oxides has been reported, which reduces the noble metal loading [3,9,18,19]. The SnO 2 -IrO 2 and IrO 2 thin layers prepared on titanium plates by thermal decomposition have also demonstrated good stability to high anodic potentials as well to highly acidic environments [18][19][20][21]. Therefore, one-step synthesis of catalyst-support systems by thermal decomposition seems to be a promising approach for preparing suitable, stable and low-cost electroactive materials to improve the OER in a SPEWE.…”

Effect of Adding CeO2 to RuO2–IrO2 Mixed Nanocatalysts: Activity towards the Oxygen Evolution Reaction and Stability in Acidic Media

“…IrO 2 has al ower activity than RuO 2 ,b ut is often preferred, as its long-terms tabilityi s significantly highert han that of RuO 2 .B oth catalysts synthesized by using different methods have largely been studied individually or in mixed oxides. [7,[10][11][12][13][14][15][16] Furthermore, somei nvestigationsh ave aimed at decreasing the amounts of ruthenium and iridium noble and scarce metals used by adding am ore abundant third" diluting" elementt om inimize the cost of the anode catalystw hile maintaining the catalytic properties. [14,[17][18][19][20][21] In our previousw ork, we described an environmentally friendly synthesis approach that avoids the use of any toxic solvent, [22] so as to obtain ruthenium-iridium-oxidea node materials that show high electrocatalytic activities and improved stabilities for ruthenium compositionsh ighert han 70 mol %.…”