Lattice Oxygen Activation for Enhanced Electrochemical Oxygen Evolution

Abstract

Lattice oxygen redox of solid-state material hosts is an emerging observation in electrochemistry. Toward the anodic oxygen evolution reaction (OER) in water electrolysis with sluggish kinetics, the activation of lattice oxygen alters the reaction mechanism profoundly, either facilitating the nucleophilic attack of O–O coupling in the conventional adsorbate evolution mechanism (AEM) or directly triggering the participation of lattice oxygen into gaseous O2 generation via the lattice oxygen-mediated mechanism (LOM). In-depth understanding at the molecular level further provides the research community with fundamental guidelines for advanced OER catalyst design. Herein, we present the physicochemical principles of correlation between the band alignment and the preferential OER mechanism. The recent progress about the key roles of lattice oxygen activation in OER activity improvement is then comprehensively discussed. Finally, we propose the remaining challenges and future perspectives of lattice oxygen activation for the potential advancements in electrocatalysis.

Silica-Confined Pt3Sn Clusters for Propane Dehydrogenation

“…32 Sn addition modified the reduction property considerably, with an additional hydrogen consumption at 753 K for the reduction of SnO x to metallic Sn. 33,34 H 2 -TPR of a reference SnO 2 @SiO 2 sample showed broad hydrogen consumption at 423−873 K, verifying a sequential process, i.e., Sn 4+ to Sn 2+ and then to Sn 0 . For the Pt 0.8 Sn 0.2 @SiO 2 sample, the peak at 598 K was most likely associated with the reduction of SnO 2 (Sn 4+ → Sn 2+ ) interacting with Pt species.…”

Electrocatalytic oxygen evolution activity of surfactant-free cobalt- and manganese-based spinel oxide nanoparticles in acid

“…51 The involvement of LOM is desirable to achieve high OER activity and stability by breaking the scaling relationship and avoiding the formation of OOH* intermediates. 52,53 The apparent activation energy (E a ) of OER 54 is further calculated based on eqn (7). where j 0 represents the exchange current density of OER.…”

“…51 The involvement of LOM is desirable to achieve high OER activity and stability by breaking the scaling relationship and avoiding the formation of OOH* intermediates. 52,53…”

Corrosion of Electrochemical Energy Materials: Stability Analyses Beyond Pourbaix Diagrams

“…Figure depicts AEM and LOM reaction pathways on the rutile MO 2 (110) surface structure. Here, we refer to a large body of previous work discussing the role of lattice oxygen activation in the OER and ways to enhance OER activity via LOM. ,, …”

“…Here, we refer to a large body of previous work discussing the role of lattice oxygen activation in the OER and ways to enhance OER activity via LOM. 60,63,64 What is far less understood, however, is the role of LOM in the electrochemical stability of catalysts. When lattice oxygen is involved in the electrochemical generation of O 2 product from water, it leads to the breaking of lattice M−O bonds, formation of structural oxygen vacancies and overall destabilization of the catalyst structure.…”