Recent advances of layered double hydroxides–based bifunctional electrocatalysts for ORR and OER

Bifunctional Single Atom Catalysts for Rechargeable Zinc–Air Batteries: From Dynamic Mechanism to Rational Design

“…reported an efficient bifunctional Fe SAC prepared by pyrolysis of thermalized covalent triazine frameworks (TTFs), which provided a stable carbonized structure with hierarchal pores and uniform anchoring sites for Fe atoms as shown in Figure 8e–g. [ 99 ] As a result, Fe‐TTF achieved extraordinary bifunctional activities with E 1/2 of 0.891 V, E j10 of 1.543 V, and ∆ E of 0.652 V. It is noteworthy that the OER activity of Fe‐TTF even outperforms conventional OER‐active catalysts, such as layered double hydroxides, [ 100,101 ] metal (hydro)oxides, [ 102,103 ] and metal phosphides. [ 104,105 ] As‐assembled ZAB obtained a peak power density of 214.2 mW cm −2 and long cycle time of ≈550 h, far exceeding that of Pt/C counterpart.…”

Interface engineering of bifunctional oxygen electrocatalysts for rechargeable Zn–air batteries

“…However, carbon-based electrocatalysts always face severe carbon corrosion, inducing interface instability and active site loss, making it challenging to achieve high durability. 77 To develop high-efficiency and durable bifunctional oxygen electrocatalysts for both the OER and ORR, an Mn-doped RuO 2 dual-site bimetallic oxide with Mn atoms encapsulated in the RuO 2 lattice was constructed. 31 Due to the precise atomic-scale regulation, the Mn-doped RuO 2 catalyst showed excellent bifunctional activities and durability with a quite low overall overpotential of 0.64 V ( vs. RHE) and negligible variation in E 1/2 / E j=10 after 250 000/30 000 CV cycles for the ORR and OER, respectively (Fig.…”

Corrosive engineering assistedin situconstruction of an Fe–Ni-based compound for industrial overall water-splitting under large-current density in alkaline freshwater and seawater media

“…Therefore, the development of largescale, low energy consumption, and high-stability nonprecious metals for water-splitting, especially those suitable for industrial applications, is a great challenge. 11,12 In recent years, numerous electrocatalysts based on non-noble metals, such as transition metal phosphide (TMP), 13 transition metal boride (TMB), 14,15 transition metal sulde (TMS), 16 and transition metal nitride (TMN), 17,18 have been extensively studied. Due to their high intrinsic catalytic activity, exible structure, and composition, transition metal nitrides have emerged as potential electrocatalysts with excellent catalytic performance and are superior to Pt and RuO 2 .…”