In recent years, a variety of OER catalysts have been used in the RTA, such as IrO
2 [
1], RuO
2 [
6], IrRu alloy [
25,
26], etc. Of these OER catalysts, IrO
2 has the best stability, and its activity is second only to RuO
2 [
27–
29]. Therefore, IrO
2 can decompose water for a long time at a relatively low potential. However, it is usually added directly into the anode in the form of particulate matter in most literature. In this case, IrO
2 may agglomerate in the catalytic layer so that it cannot protect all the carbon support [
30]. Based on this situation, Roh et al. [
30] deposited monodisperse IrO
2 on commercial Pt/C, and effectively improved the dispersion of IrO
2 in the catalytic layer. However, the preparation steps are cumbersome. Jang et al. [
31] added IrO
2/C to the anode by improving the dispersion of IrO
2 on carbon, which showed less cell performance degradation than that of adding IrO
2 after frequent cell reverse. However, the additional carbon introduction would increase the possibility of corrosion. Consequently, it is necessary to improve the dispersion of IrO
2 in the catalytic layer and develop antioxidant catalyst supports at the same time. Ti
4O
7 has been widely regarded as a corrosion-resistant and electrically conductive material [
32]. There are some reports utilizing Ti
4O
7 as a support material. For example, Ioroi and Yasuda [
33] used Ti
4O
7 as the support of Pt, which greatly improved the reversal tolerance of the cell under the condition of fuel starvation. Won et al. [
34] used Ti
4O
7 supported PtIr alloy as a bifunctional catalyst, showing excellent oxygen reduction reaction (ORR) and OER performance compared with single metal. However, there is no report on using Ti
4O
7-supported iridium oxide as the reversal tolerant components in the presence of Pt/C.