Electrocatalysis for the Oxygen Evolution Reaction in Acidic Media: Progress and Challenges

Abstract

The oxygen evolution reaction (OER) is the efficiency-determining half-reaction process of high-demand, electricity-driven water splitting due to its sluggish four-electron transfer reaction. Tremendous effects on developing OER catalysts with high activity and strong acid-tolerance at high oxidation potentials have been made for proton-conducting polymer electrolyte membrane water electrolysis (PEMWE), which is one of the most promising future hydrogen-fuel-generating technologies. This review presents recent progress in understanding OER mechanisms in PEMWE, including the adsorbate evolution mechanism (AEM) and the lattice-oxygen-mediated mechanism (LOM). We further summarize the latest strategies to improve catalytic performance, such as surface/interface modification, catalytic site coordination construction, and electronic structure regulation of catalytic centers. Finally, challenges and prospective solutions for improving OER performance are proposed.

Recent developments of iridium-based catalysts for the oxygen evolution reaction in acidic water electrolysis

“…Largely differing from the AEM, the LOM route can break the limits of the scaling relationship via direct participation of lattice oxygen in the oxygen evolution reaction, which also means the occurrence of a violent kinetic lattice oxygen exchange on the catalytic surface. 40 According to the number of lattice oxygen participating, recent research studies have proposed two popular LOMs with different lattice oxygen redox mechanisms: single-oxygen-vacancy mechanism (SOVM, Fig. 2e) and dual-oxygen-vacancy mechanism (DOVM, Fig.…”

Developing metal‐organic framework‐based composite for innovative fuel cell application: An overview

“…It happens due to a surface oxygen vacancy. Finally, the surface lattice is reinstated before any water adsorption and dissociation on the vacancy 76 …”

“…Finally, the surface lattice is reinstated before any water adsorption and dissociation on the vacancy. 76 Generally, the reduction of oxygen molecules has two different pathways, namely through the four-electron pathway. This method tells of the process O 2 is reduced straight into two H 2 O molecules in an acidic environment or four OH À in an alkaline medium as following in Equation ( 1) and ( 2) below 77 :…”

Кінетика І Механізм Електрохімічного Виділення Кисню У Лужному Розчині На Нікелевих Покриттях

“…The development of new, highly efficient and inexpensive electrocatalysts for the process of water electrolysis is an important task of modern electrochemical science in the framework of creating environmentally friendly hydrogen energy [1][2][3]. In this context, the improvement of electrocatalytic materials for the anodic oxygen evolution reaction is one of the key tasks [2][3][4][5][6][7][8]. A relatively high energy barrier of the electrochemical oxygen evolution reaction is the cause of this process significant electrode polarization, which leads to an extremely undesirable increase in voltage on the cell and a corresponding increase in energy consumption.…”