Co–Mn spinel oxides are the most promising precious-metal-free catalysts for oxygen reduction in alkaline electrolytes, but their structure–activity properties are not yet fully understood. Now, in situ XRD and REXS performed on MnCo2O4 identify surface tensile strain at low potentials and a reversible transformation between cubic and tetragonal structures.
- Jason J. Huang
- Yao Yang
- Andrej Singer
