Carbon nanobowls supported ultrafine iridium nanocrystals: An active and stable electrocatalyst for the oxygen evolution reaction in acidic media

Supporting IrO2 and IrRuO nanoparticles on TiO2 and Nb-doped TiO2 nanotubes as electrocatalysts for the oxygen evolution reaction

“…The results shown in Tables 6 and 7 strongly suggest that the OER at high current densities, for all the catalysts studied in this paper, is kinetically controlled through step (8). However, at low current densities and, as the Tafel slopes are in the range 40-60 mV dec −1 , the process appears to be limited by a mixed kinetic control through steps (9) and (5).…”

“…This allowed interpreting the OER on Ti/IrO 2 -Ta 2 O 5 in H 2 SO 4 [57] , in which Tafel slopes of 59 and 130 mV dec −1 were reported for low and high current densities. The experimental curves fitted well in the low j range with a Tafel slope of 60 mV dec −1 when steps (8) and (9) were slow with respect to steps (5)- (7). On the other hand, a good fit was obtained in the high j region with a Tafel slope of 125 mV dec −1 when step (8) was the rds.…”

“…The stability under the operating conditions of the cell is one of the main requirements that catalyst supports should meet. With the exception of advanced carbon supports such as carbon nanobowls, which appeared to be very stable in acidic media as supports for ultrafine Ir nanocrystals [8] , carbons can suffer oxidation during the OER. For this reason, one of the main targets is the research of new noncarbon supports for anodes in PEMWEs [9] .…”

Hierarchical iridium-based multimetallic alloy with double-core-shell architecture for efficient overall water splitting

“…Electrochemical water splitting is considered as one of the most promising way to produce hydrogen [1-3], which composes of hydrogen evolution reaction (HER) of cathodic half-reaction and oxygen evolution reaction (OER) of anodic half-reaction [4][5][6][7][8][9][10][11]. Acid polymer electrolyte membrane water electrolyzer (PEMWE) is the most popular technique towards the production of hydrogen and oxygen fuels [12][13][14][15][16][17]. Pt and Ir/Ru-based nanocatalysts are emerging as the state-of-the-art metal catalysts for HER and OER in PEMWE, respectively [2, [18][19][20][21][22].…”

Aplicación de nanopartículas de IrO2-WO3 como material anódico para la Reacción de Evolución de Oxígeno en un medio ácido

“…Junio 2019 Vol.6 No. 19 En la figura 8 es posible observar la presencia de dos semicírculos atribuidos a una reacción acoplada a 0.6V vs Hg/Hg2SO4 es posiblemente por la reacción superficial que presenta el WO3 en la presencia de evolución de oxígeno, generando sobre la superficie del electrodo algún oxido superficial se llega a dar con gran velocidad durante la cinética de la reacción. De igual manera se observa la disminución de la resistencia a altas frecuencias a 6 Ωcm 2 y una resistencia a la transferencia de carga de 14 Ωcm 2 atribuida a la reacción de evolución de Oxígeno y una segunda reacción acoplada de 54 Ωcm 2 atribuida a la reacción superficial del WO3 la cual se puede observar durante la reacción en la voltamperometría cíclica.…”