Improved Durability of Highly Active IrOx Electrodes for Electrocatalytic Oxygen Evolution Reaction

Integrated Operation of Artificial-Photosynthetic Reaction and Product Isolation to Output Only Pure Formic Acid

“…10,11 The device consisted of 1 m 2 -sized Ru-complexbased cathode electrodes, IrO x -based anode electrodes, and single-crystalline silicon solar cells, achieving a high solar-tochemical energy conversion efficiency of 10.5%. Then, we tackled remaining challenges: improvements in both activity and durability of the cathode and anode catalysts, 12,13 direct reduction of CO 2 in a flue gas eliminating the CO 2 capture and condensation processes, 14 and specific design of solar cells suitable for direct connection to the electrochemical reactors. 15−17 In particular, long-term durability is of great importance for practical use.…”

“…We previously constructed a practically large-sized device to synthesize formic acid using solar energy, which was a major milestone toward widespread use of artificial photosynthesis. , The device consisted of 1 m 2 -sized Ru-complex-based cathode electrodes, IrO x -based anode electrodes, and single-crystalline silicon solar cells, achieving a high solar-to-chemical energy conversion efficiency of 10.5%. Then, we tackled remaining challenges: improvements in both activity and durability of the cathode and anode catalysts, , direct reduction of CO 2 in a flue gas eliminating the CO 2 capture and condensation processes, and specific design of solar cells suitable for direct connection to the electrochemical reactors. − In particular, long-term durability is of great importance for practical use. We improved the durability of the Ru-complex-based cathode electrodes to achieve stable operation of the formic-acid synthesis over 3000 h…”

Investigating the Influence of Amorphous/Crystalline Interfaces on the Stability of IrO2 for the Oxygen Evolution Reaction in Acidic Electrolyte

“…To develop an effective and stable iridium oxide based catalyst with minimal dissolution an understanding of the OER catalytic mechanism is vital [47–51] . However, the mechanism of iridium oxide dissolution during the OER is still a contentious issue.…”

“…To develop an effective and stable iridium oxide based catalyst with minimal dissolution an understanding of the OER catalytic mechanism is vital. [47][48][49][50][51] However, the mechanism of iridium oxide dissolution during the OER is still a contentious issue. There are two possible four-electron transfer mechanisms for the OER on metal oxide electrocatalysts in acidic media; the adsorbate evolution mechanism (AEM) and the lattice oxygen participation mechanism (LOM).…”

IrOx–Pt electrode for the electro-oxidation of ethanol in alkaline-type direct ethanol fuel cells: an excellent CO-tolerant catalyst

“…9 Despite this fact, the Ir metal and its oxide, particularly IrO 2 , have been utilized directly in EtOR or to enhance the performance of other catalysts like Pt, Sn, Ru, and RuO 2 in EtOR. 30,[35][36][37][38][39][40][41] Furthermore, the utilization of Ir oxide as an electrode material has been investigated for various applications, including the oxidation of organic molecules, 42,43 oxygen evolution reaction, [44][45][46][47][48][49][50][51][52][53] oxygen reduction reaction, 50 and pH sensing. 54 According to reports, Ir species, particularly iridium oxide, exhibit a high degree of stability in various aqueous environments and do not experience corrosion.…”