Although single atom catalyst (SAC) can maximize the atomic utilization, platinum (Pt)-based SAC is typically inactive to break the O = O bond in oxygen reduction. Herein, the nanoporous Ti₄O₇ was synthesized while Pt was atomically dispersed on the Ti₄O₇ surface by a one-step calcination method. The as-prepared Pt/Ti₄O₇ SAC exhibits a half-wave potential of 0.896 V and a mass activity of 4081.5 A/g_Pt at 0.9 V with negligible degradation after 20,000 cycles. Meanwhile, it exhibits a Pt utilization efficiency of 0.16 g_Pt kW⁻¹ in H₂/O₂ fuel cell and a slight attenuation of the output current density (9.4%) after 120 h. The incorporated monatomic Pt electronically couples with the Tiⁿ⁺ (3 ≤ n < 4) to enhance bilateral electron transfer. The awakened Tiⁿ⁺ active sites synergize with monatomic Pt to moderate the adsorption intensity of O₂ and dissociate the O = O bond, opening up a four-electron pathway on the Pt-based SAC.

尽管单原子催化剂 (SAC) 可以最大限度地提高原子利用率，但基于铂 (Pt) 的 SAC 通常不会在氧还原中破坏 O = O 键。在此，通过一步煅烧法合成纳米多孔Ti ₄ O ₇，同时将Pt原子分散在Ti ₄ O _{7表面上。}所制备的 Pt/Ti ₄ O ₇ SAC 在 0.9 V 下表现出 0.896 V 的半波电位和 4081.5 A/g _Pt的质量活度，在 20,000 次循环后降解可忽略不计。同时，其Pt利用效率为0.16 g _Pt kW ^-1 in H ₂ /O ₂燃料电池和 120 小时后输出电流密度略有衰减（9.4%）。掺入的单原子 Pt 与 Ti ⁿ⁺ (3 ≤ n < 4) 电子耦合以增强双边电子转移。唤醒的 Ti ⁿ⁺活性位点与单原子 Pt 协同作用以缓和 O ₂的吸附强度并解离 O = O 键，从而在 Pt 基 SAC 上开辟一条四电子通路。