Cobalt complexes that reversibly bind and release O2 functioned as O2 carriers, or O2-enriching media, at the surface of a cathode to enhance the current for the reduction of O2. The effect of the cobalt complex to accumulate O2 was evidenced by the higher open-circuit potential, which reflected the equilibrated concentration of O 2 at the electrode surface. The combination of the cobalt complex and the conventional Pt/C catalyst resulted in a significant increase in the steady-state current for the four-electron reduction of O2, particularly at small overpotentials where typical fuel cells operate, based on the facilitated transport of O2 from the atmosphere to the catalyst at the electrode surface.
ASJC Scopus subject areas
- 化学 (全般)