Formation, structure and electrochemical properties of IrO2-RuO2 oxide electrodes

Tantalum carbide as a novel support material for anode electrocatalysts in polymer electrolyte membrane water electrolysers

“…8) had the overall shape that has been reported by other researchers [21,27]. This shape is characterised by an absence of any well-defined peaks, although the total anodic charge recorded is related to the total number of active sites [11].…”

Avoid the quasi-equilibrium assumption when evaluating the electrocatalytic oxygen evolution reaction mechanism by Tafel slope analysis

“…One apparent limitation of the electrochemical oxide mechanism is that is does not give Tafel slopes of 30 and 60 mV -the typical values observed for RuO 2 and IrO 2 anodes [6][7][8][9][10][11]17]. In fact several authors appear to rule out the electrochemical oxide mechanism on the basis that the experimental Tafel slopes do not match those predicted from the mechanism, and then develop new mechanisms, to overcome this apparent limitation [6,10,13,17].…”

“…An equivalent experimentally measurable quantity which can be used in place of the classical Tafel slope is the transfer coefficient as defined by α = RT F d ln i dE [4,5]. For OER electrocatalysts such as RuO 2 or IrO 2 , the Tafel slope is normally between 30 and 60 mV, but can exhibit Tafel slopes of up to 120 mV at high overpotentials [6][7][8][9][10][11].…”

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 %.…”