Highly graphited carbon-coated FeTiO₃ nanosheets in situ derived from MXene: an efficient bifunctional catalyst for Zn–air batteries

Abstract

Developing high-efficiency and low-cost catalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is of great significance for the commercialization of rechargeable metal-air batteries. Herein, we demonstrated the...

Single-atom palladium anchored N-doped carbon towards oxygen electrocatalysis for rechargeable Zn–air batteries

“…According to previous references, five basic steps are widely accepted pathways in the OER under alkaline conditions. 5–9 The OER occurs via the following steps: 53 4OH − + * → *OH + e − + 3OH − *OH + e − + 3OH − → *O + H 2 O + 3OH − + e − *O + H 2 O + 2OH − + 2e − → *OOH + 3e − + OH − + H 2 O*OOH + 3e − + OH − + H 2 O → *O 2 + 2H 2 O + 4e − *O 2 + 2H 2 O + 4e − → * + O 2 + 2H 2 O + 4e − …”

“…1–4 The efficiency of the ORR/OER serves a crucial role in enhancing the performance of ZABs. 5,6 The revisable discharge/charge process at the air electrode of ZABs in alkaline electrolytes is O 2 + 4e − + H 2 O ↔ 4OH − . 7 However, the reaction pathways usually involve multiple-electron transfer, subjecting to sluggish O 2 reduction and evolution kinetics.…”