Platinum is the archetypal electrocatalyst for oxygen reduction—a key reaction in fuel cells and zinc–air batteries. Although dispersing platinum as single atoms on a support is a promising way to minimize the amount required, catalytic activity and selectivity are often low due to unfavourable O₂ adsorption. Here we load platinum onto α-Fe₂O₃ to construct a highly active and stable catalyst with dispersed Pt–Fe pair sites. We propose that the Pt–Fe pair sites have partially occupied orbitals driven by strong electronic coupling, and can cooperatively adsorb O₂ and dissociate the O=O bond, whereas OH* can desorb from the platinum site. In alkaline conditions, the catalyst exhibits onset and half-wave potentials of 1.15 V and 1.05 V (versus the reversible hydrogen electrode), respectively, mass activity of 14.9 A mg⁻¹_Pt (at 0.95 V) and negligible activity decay after 50,000 cycles. It also shows better performance than 20% Pt/C in a zinc–air battery and H₂–O₂ fuel cell in terms of specific energy density and platinum utilization efficiency.

铂是氧还原的典型电催化剂——这是燃料电池和锌空气电池中的一个关键反应。_{尽管将铂作为单个原子分散在载体上是一种很有前途的方法来最小化所需的量，但由于不利的 O 2}吸附，催化活性和选择性通常很低。在这里，我们将铂负载到 α-Fe ₂ O ₃上，以构建具有分散的 Pt-Fe 对位点的高活性且稳定的催化剂。我们提出Pt-Fe对位点在强电子耦合驱动下部分占据轨道，可以协同吸附O ₂并解离 O=O 键，而 OH* 可以从铂位点解吸。在碱性条件下，催化剂的起始电位和半波电位分别为 1.15 V 和 1.05 V（相对于可逆氢电极），质量活性为 14.9 A mg ^-1 _Pt（在 0.95 V 时），50,000 次循环后活性衰减可忽略不计. 在比能量密度和铂利用效率方面，它在锌空气电池和 H ₂ -O ₂燃料电池中也表现出比 20% Pt/C 更好的性能。