Rechargeable Zn-air batteries initiated by nickel–cobalt bimetallic selenide

Strong coupled spinel oxide with N-rGO for high-efficiency ORR/OER bifunctional electrocatalyst of Zn-air batteries

“…However, the main technical challenge limiting the extensive commercialization of metal-air batteries is the intrinsically sluggish kinetics of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) processes. At present, precious metals, such as Ru, Ir, and Pt, and their alloys are known as the most efficient electrocatalysts for the OER or ORR processes, but their scarcity and prohibitive cost are major obstacles for their practical application [6][7][8][9]. Furthermore, these noble metal electrocatalysts only exhibit excellent activity for either the ORR or OER process, hindering their use as efficient bifunctional electrocatalysts for metal-air batteries.…”

Recent advances in spinel-type electrocatalysts for bifunctional oxygen reduction and oxygen evolution reactions

“…1 ) [30] . Diverse ion arrays and different exposed facets in the spinel structure have prominent effects on the electronic structure and chemical properties [31][32][33][34] . As a result, the OER/ORR performance is highly dependent on the diverse electronic structure such as the number of e g filling electrons, the corresponding spin state in spinel type compounds and the covalency of transition metal-oxygen bond [35][36][37] .…”

Topotactically constructed nickel–iron (oxy)hydroxide with abundant in-situ produced high-valent iron species for efficient water oxidation

“…Oxygen evolution reaction (OER), as a core reaction in water electrolysis and for the storage of renewable electricity, has received lots of research attentions over the past few years [1][2][3][4]. The development of low-cost and high-efficiency OER catalysts with low overpotential and high stability is of great significance for the renewable energy technologies [5][6][7][8].…”