Zhu, YinlongTahini, HassanHu, ZhiweiYin, YichunLin, QianSun, HainanZhong, YijunChen, YuboZhang, FeifeiLin, Hong-JiChen, Chien-TeZhou, WeiZhang, XiwangSmith, SeanShao, ZongpingWang, Huanting2021-11-292021-11-29Zhu Y, Tahini HA, Hu Z, et al. Boosting oxygen evolution reaction by activation of lattice-oxygen sites in layered Ruddlesden-Popper oxide. EcoMat. 2020;2:e12021. https://doi.org/10.1002/eom2.120212567-3173http://hdl.handle.net/1885/251987Emerging anionic redox chemistry presents new opportunities for enhancing oxygen evolution reaction (OER) activity considering that lattice-oxygen oxidation mechanism (LOM) could bypass thermodynamic limitation of conventional metal-ion participation mechanism. Thus, finding an effective method to activate lattice-oxygen in metal oxides is highly attractive for designing efficient OER electrocatalysts. Here, we discover that the lattice-oxygen sites in Ruddlesden-Popper (RP) crystal structure can be activated, leading to a new class of extremely active OER catalyst. As a proof-of-concept, the RP Sr3(Co0.8Fe0.1Nb0.1)2O7-δ (RP-SCFN) oxide exhibits outstanding OER activity (eg, 334 mV at 10 mA cm−2 in 0.1 M KOH), which is significantly higher than that of the simple SrCo0.8Fe0.1Nb0.1O3-δ perovskite and benchmark RuO2. Combined density functional theory and X-ray absorption spectroscopy studies demonstrate that RP-SCFN follows the LOM under OER condition, and the activated lattice oxygen sites triggered by high covalency of metal-oxygen bonds are the origin of the high catalytic activity.This work was financially supported by the Australian Research Council (Discovery Early Career Researcher Award No. DE190100005).application/pdfen-AU© 2020 The Authorshttps://creativecommons.org/licenses/by/4.0/anion activationlattice-oxygen sitesoxygen evolution reactionRuddlesden-Popper oxidestructure engineering2020-06-2310.1002/eom2.120212021-11-28Creative Commons Attribution License