Activity Origin and Catalyst Design Principles for Electrocatalytic Oxygen Evolution on Layered Transition Metal Oxide with Halogen Doping

Abstract

The electronic structure of transition meatal oxides is in the predominant position among mostly central reactions, such as oxygen electroncatalysis, for the applications in energy storage. Herein, cobalt‐based catalysts are developed by taking the advantage of the strong electronegativity of halogen elements, whose activity and stability are also guaranteed. A “theory–calculation–experiment” research system is proposed to sort out the relationship between the electronegativity of heteroatoms and the electronic structure of layered CoO/F, CoO/Cl, and CoO/Br, for the electrochemical oxygen evolution reaction (OER). Experiments corresponding to calculations also verify that the stronger the electronegativity of the halide ions in the cobalt oxide catalyst, the more obvious the improvement of OER performance. By understanding the electronegative screening of halogen modification, a new perspective on designing principles for water‐splitting devices based on bandgap‐engineered metal oxides is proposed.

Highly Efficient Oxygen Electrocatalyst for Rechargeable Zinc-Air Batteries: Surface-Oxidized Cobaltous Fluoride Nanocrystals Embedded in Carbon Nanofibers

“…This result is in well agreement with that of the literature, where the ORR or OER activity of the Co-based electrocatalysts has been effectively improved by tuning the Co 3d band with the p-band of O and Halogen. 28,44…”

Experimental progress on the emergent infinite-layer Ni-based superconductors

“…Oxygen vacancies play important roles in oxides including catalysis [109][110][111][112], gas sensor applications [113], energy storage [114,115], electronic states [116] and in oxide interface systems [117][118][119][120][121] such as LaAlO3/SrTiO3 interfaces [122,123]. In the superconducting Nd0.8Sr0.2NiO2/SrTiO3 superconducting system, oxygen vacancies may be generated during the soft chemical reduction, which could contribute conducting channels and thus affect superconducting transitions.…”

Electronic optimization and modification of efficient Ir clusters embedded onto Ni–Mo–P for electrocatalytic oxygen evolution reaction

“…Due to their outstanding performances and active catalytic mechanisms of OER, RuO 2 and IrO 2 are highly desirable electrocatalysts [9,10], however, low abundance and high cost signi cantly hinder their applications [11][12][13]. As attractive alternatives to precious metal oxides, transition metal compounds (TMCs) have attracted tremendous interests [14][15][16][17], which have been considered as catalysts for electrochemical oxygen evolution via their active sites of metal-O (M-O), M-S, and M-P bonds [18][19][20][21]. However, OER over TMCs suffers from inferior electrochemical performances and poor stability, attributing to the unstable structure and unactive intrinsic activity.…”