Elaboration and characterization of ruthenium nano-oxides for the oxygen evolution reaction in a Proton Exchange Membrane Water Electrolyzer supplied by a solar profile

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

“…The q*v alues were assessedb yi ntegration of the current-potential (i-E)c urvesi nt he same potential range than for the capacitance measurements. The method used to calculate the values of the charges q* To tal and q* Outer is described in our previousw ork [22,23] and requires the calculation of charges for different scan rates between 7a nd 500 mV s The accessibility of the active sites wasa lso evaluated by the q* Outer /q* To tal ratio (Table 2a nd Figure 5b). The highest accessibilities were found for RuO 2 and Ru 0.80 Ir 0.20 O 2 oxides, whereas the lowest wasf ound for the IrO 2 catalyst.…”

“…[22,23] Firstly, solutions containing metallic chloride precursors were prepared. Different molar compositions were established with aglobal metallic (Ru, Ir,and Ce) concentration of 0.025 mol L…”

“…[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 %. [23] In the presentw ork, we report the effect of the substitution of iridiumb yc erium on the electrocatalytic properties of ruthenium-iridium nanomaterials.…”

Nanosized IrOx–Ir Catalyst with Relevant Activity for Anodes of Proton Exchange Membrane Electrolysis Produced by a Cost‐Effective Procedure

“…Ther esulting exchange current densities were investigated and depicted in Figure 3c.Itisimportant to note that the linear fit of the exchange current density of IrO x -Ir has alower slope over measured temperature than the one of Ir-black, corresponding to al ower activation energy.T he calculated activation energy for IrO x -Ir and Ir-black is 40 kJ mol À1 and 52 kJ mol À1 ,r espectively.B oth values are consistent with other reports. [34][35][36] Based on the activation energies,the transfer coefficient (a)values were calculated to evaluate the rate-determining steps according to Krasilshchikov. [37] Thef ollowing equations (1-4) represent the possible determining steps,w here Sc orresponds to the active site of the catalytic metal.…”

Nanosized IrOx–Ir Catalyst with Relevant Activity for Anodes of Proton Exchange Membrane Electrolysis Produced by a Cost‐Effective Procedure

“…Ther esulting exchange current densities were investigated and depicted in Figure 3c.Itisimportant to note that the linear fit of the exchange current density of IrO x -Ir has alower slope over measured temperature than the one of Ir-black, corresponding to al ower activation energy.T he calculated activation energy for IrO x -Ir and Ir-black is 40 kJ mol À1 and 52 kJ mol À1 ,r espectively.B oth values are consistent with other reports. [34][35][36] Based on the activation energies,the transfer coefficient (a)values were calculated to evaluate the rate-determining steps according to Krasilshchikov. [37] Thef ollowing equations (1-4) represent the possible determining steps,w here Sc orresponds to the active site of the catalytic metal.…”