High-Throughput Screening Methods In article number 2204520, Lydia Helena Wong and co-workers discover an efficient ternary Mn-based spinel oxide (Fe0.3Co1.2Mn1.5O4) for oxygen evolution reaction (OER) by employing high-throughput screening methods. The high OER catalytic performance originates from the multiple active sites in various geometric sites, i.e., Co2+ tetrahedral- Mn3+ octahedral- s...