Lattice oxygen activation in disordered rocksalts for boosting oxygen evolution

Abstract

The recent development in some special oxygen evolution reaction (OER) electrocatalysts shows that the lattice oxygen could participate in the catalyzing process via lattice oxygen oxidation mechanism (LOM), which provides...

Engineering the oxygen-evolution activity by changing the A-site rare-earth elements in RSr3Fe1.5Co1.5O10−δ (R = La, Nd, Pr) Ruddlesden–Popper perovskites

“…Except for the pH-dependent activity, the LOM can be indirectly proved by peroxo-like (O sensitive tetramethylammonium cation (TMA + ) into the electrolyte as a chemical detector to track the O 2 2À species during the LOM process. [45][46][47] We compared the OER activity of LSFC, NSFC, and PSFC electrodes in 1 M KOH and 1 M tetramethylammonium hydroxide (TMAOH) electrolytes, respectively. As shown in Fig.…”

Lattice Oxygen Redox Mechanisms in the Alkaline Oxygen Evolution Reaction

“…In detail, one is the CPET process; the other involves a nonconcerted proton-electron transfer step, where the decoupled proton transfer is highly constrained by the pH level of the electrolyte. [80][81][82] Such a pH-dependent OER activity on the reversible hydrogen electrode (RHE) scale stems from the mismatch between electron-transfer kinetics and OH − affinity at theelectrocatalyst/electrolyte interface. [83,84] Compared to the AEM-based electrocatalyst, the LOM process typically exhibits pH dependence at the RHE scale due to the thermodynamic instability of the bulk phase of LOM-based catalyst under operando OER conditions irrespective of the pH value and the decreased charge-transfer energy that shields charges at the catalyst/electrolyte interface via the introduction of ligand holes into the O 2p band, weakening the OH − adsorption.…”

Highly Efficient Cobalt Sulfide Heterostructures Fabricated on Nickel Foam Electrodes for Oxygen Evolution Reaction in Alkaline Water Electrolysis Cells

“…Furthermore, recent studies have proposed a new mechanism for the OER based on redox chemistry, defined as a lattice oxidation mechanism (LOM). In this mechanism, the lattice oxygen could be activated at the corresponding potential and could participate in the formation of O-O active intermediates during the OER [42][43][44].…”