Selection of oxygen reduction catalysts for secondary tri-electrode zinc-air batteries.

ABSTRACT: Oxygen reduction reaction (ORR) electrocatalysts, which are highly efficient, low-cost, yet durable, are important for secondary Zn-air cell applications. ORR activities of single and mixed metal oxide and carbon electrocatalysts were studied using rotating disc electrode (RDE) measurements, Tafel slope and Koutecky-Levich plots. It was found that MnO_x combined with XC-72R demonstrated high ORR activity and good stability-up to 100 mA cm^-2. The performance of the selected ORR electrode and a previously optimised oxygen evolution reaction (OER) electrode was thereafter tested in a custom-built secondary Zn-air cell in a tri-electrode configuration, and the effects of current density, electrolyte molarity, temperature, and oxygen purity on the performance of the ORR and

SUBMITTER: Loh A 

PROVIDER: S-EPMC9035146 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature