Enhanced Electrocatalytic Performance of IrO_x by Employing F‐Doped TiO₂ as Support towards Acidic Oxygen Evolution Reaction

Abstract

F‐doped TiO2 is developed through simple solid‐phase synthesis and innovatively employed to support IrOx nanoparticles towards acidic oxygen evolution reaction. Benefiting from the high electrical conductivity, improved electronic interaction, and well dispersing/anchoring effects of F‐TiO2, the IrOx/F‐TiO2 electrocatalyst requires only 272 mV overpotential to achieve 10 mA cm−2, accompanied with the mass activity of 320.2 A gIr−1@1.55 V. Moreover, the single cell voltages are only 1.662 V@1 A cm−2 and 1.749 V@2 A cm−2 when employing IrOx/F‐TiO2 as the anode catalyst, and operates steadily for at least 240 h. Hence, low overpotential, enhanced stability and prominent catalyst utilization are simultaneously realized.

Recent advances in iridium-based catalysts with different dimensions for the acidic oxygen evolution reaction

“…125 For example, IrO x nanoparticles supported on F-doped titanium dioxide (F-TiO 2 ) were an efficient catalyst for the acidic OER, and the electron transfer between F-TiO 2 and IrO x effectively inhibited the oxidative dissolution of Ir active species, thereby significantly improving the stability of the catalyst. 126 Besides, the introduction of defects in the catalyst could disturb the regular arrangement of the crystal lattice, leading to the redistribution of atoms or electrons, which produces electronic effects to improve the catalytic activity. 13,127 Defects are generated due to the difference between ideal and actual structures, which includes the types of vacancies, dislocations, voids, disorders, etc.…”

“…125 For example, IrO x nanoparticles supported on F-doped titanium dioxide (F-TiO 2 ) were an efficient catalyst for the acidic OER, and the electron transfer between F-TiO 2 and IrO x effectively inhibited the oxidative dissolution of Ir active species, thereby significantly improving the stability of the catalyst. 126…”

Improved electronic interaction and dispersing effect derived from the F-doped TiO2support on RuOxto boost the electrocatalytic oxygen evolution performance

“…[23][24][25][26] Even so, F and N-doped TiO 2 also effectively show comprehensive support effects on IrO x to boost the OER. 27,28 By contrast, the non-metal-doped TiO 2 support still remains unexplored for the RuO x catalytic system.…”