A dual-site doping strategy for developing efficient perovskite oxide electrocatalysts towards oxygen evolution reaction

Atomic cation-vacancy engineering of two-dimensional nanosheets for energy-related applications

“…Intentional creation of atomic cation vacancies has been explored to increase the electrocatalytic activity of 2D nanosheets by activation of the inert basal plane, 69 enhancement of electron-transferring properties, 71,109 and regulation of favorable atomic strain. 52,53 Ding et al theoretically investigated that Mo vacancies can activate the inert basal plane of MoSe 2 for the HER (Fig.…”

Recent Advances on Perovskite Electrocatalysts for Water Oxidation in Alkaline Medium

“…36−38 In addition, perovskite could allow some elements to exist in abnormal states, such as oxygen with nonstoichiometric ratio and the active metal of the A/B site to exist in a mixed valence state. 39,40 This will obtain the distinctive chemical properties and generate abundant oxygen vacancies in perovskite, which are beneficial to achieve higher catalytic performance. Furthermore, perovskite with multiple elements coexisting at the B site has been proven to significantly optimize lattice parameters, structural stability, and e g electron filling of surface transition metal cations associated with catalytic activity, compared with the original perovskite.…”

“…The A-site and B-site ions can bond with 12 oxygen atoms and six oxygen atoms to form the densest cubic packing in the perovskite structure, respectively. This structural and compositional richness of perovskite can provide great opportunities to modulate the geometric and electronic structure of perovskite catalysts, so that could optimize its OER catalytic performance. − In addition, perovskite could allow some elements to exist in abnormal states, such as oxygen with nonstoichiometric ratio and the active metal of the A/B site to exist in a mixed valence state. , This will obtain the distinctive chemical properties and generate abundant oxygen vacancies in perovskite, which are beneficial to achieve higher catalytic performance. Furthermore, perovskite with multiple elements coexisting at the B site has been proven to significantly optimize lattice parameters, structural stability, and e g electron filling of surface transition metal cations associated with catalytic activity, compared with the original perovskite. , The most typical perovskite oxide used as an OER catalyst is BaSrCoFeO x …”

Facile Synthesis and Origin of Enhanced Electrochemical Oxygen Evolution Reaction Performance of 2H-Hexagonal Ba2CoMnO6−δ as a New Member in Double Perovskite Oxides

“…Hence, the perovskite oxide structure offers a great platform for establishing the material’s nature and electrochemical performance relationship. − Several times, it has been reported that the OER activity of perovskite oxides is closely interrelated with the electronic structure of B-site metal, lattice oxygen participation, and oxygen vacancies. − In fact, this implies that any strategy manipulating the B-site element can result in a variation in the OER activity. Although in most studies, oxidation of the B-site element has been varied via substitution of a B-site element, − A-site management strategy-induced OER performance has been less explored. Substitution of a trivalent ion with a divalent ion at the A-site can lead to rearrangement of the charge balance of the structure and vacancy formation. ,,− For example, the substitution of divalent Sr at the A-site of LaCoO 3 was shown to increase electrical conductivity and thus enhance OER performance .…”