Review of acidic titanium-based oxygen evolution anode catalyst design: Mechanistic, compositional design, and research status

Oxygen evolution reaction (OER) is a key half-reaction in fields including water electrolysis, organic synthesis, and water treatment. With the development of the industry, research into highly active and stable oxygen evolution anodes in an acidic environment is essential. DSA is the dimensionally stable anode. Widespread attention has been paid to titanium-based DSAs in the field of acidic oxygen precipitation due to their low overpotential and high acid resistance. The titanium-based anode mainly consists of two parts: catalyst and titanium substrate, where the design of the catalyst is the key to the anode design. The factors affecting the catalytic activity and durability of the titanium-based DSA were heterogeneous and rarely reported. In this paper, the influence of catalytic mechanism and composition design on the catalytic activity and service life of anode is reviewed from the perspective of the catalyst. Then, the current situation related to anode preparation is summarized, and an improvement strategy to enhance the activity and stability of anode is proposed based on the failure mode of titanium-based DSA.