Toward highly efficient bifunctional electrocatalysts for zinc–air batteries: from theoretical prediction to a ternary FeCoNi design

Abstract

The 3d transition-metal nitrogen-carbon nanocomposites (T-N-C, T=Fe, Co, Ni, etc) with highly active M-Nx sites have received much attention in the field of rechargeable zinc-air battery research. However, how to...

Acid Etching Strategy: Optimizing Bifunctional Activities of Metal/Nitrogen‐doped Carbon Catalysts for Efficient Rechargeable Zn‐Air Batteries

“…As shown in Figure 2c, the C 1s spectrum of NiCoFe−NC‐30 can be deconvoluted into C−C (284.8 eV), C−N (285.9 eV), and C−O (288.9 eV). The C−C bond in NiCoFe−NC‐30 is attributed to the sp 2 hybrid graphitic carbon, [22] and the presence of the C−N bond reveals that the N is successfully doped into the carbon lattice. As reported, the N−C bond plays a key role in ORR/OER activities [23] .…”

Advanced design strategies for Fe-based metal–organic framework-derived electrocatalysts toward high-performance Zn–air batteries

“…Integrating metal ions with good compatibility into the MOF structure can enable different metal centers to have different functions without changing the original topological structure. [149][150][151] Farahani et al 152 used the electrodeposition method to orderly grow three layers of the Fe-Co-Ni MOF on a nickel foam substrate (Fig. 8(i) and (j)).…”

Ruthenium single-atom doping-driven modulation of Co3O4 spinel tetrahedral site 3d-orbital occupancy in lithium–oxygen batteries

“…Consequently, cobalt-based oxides are gaining attention due to their high electron transfer efficiency and relatively flexible electron configuration, making them promising oxygen electrode catalysts for LOBs. [19][20][21][22][23][24][25][26][27][28] Research has indicated that constructing cobalt oxide-based catalysts with a large specific surface area and hollow porous structure enhances the exposure of catalytically active centers and provides more nucleation centers for Li 2 O 2 , thereby improving the mass transfer efficiency of batteries. [28][29][30][31][32][33][34][35][36][37][38] Current modification methods for spinel metal oxides focus on controlling the material's morphology and adjusting the electronic configuration of octahedral sites coinciding with O-2p orbitals, 29,39 but the role of tetrahedral sites in the oxygen-containing intermediates during the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) processes is not fully understood.…”

“…[19][20][21][22][23][24][25][26][27][28] Research has indicated that constructing cobalt oxide-based catalysts with a large specific surface area and hollow porous structure enhances the exposure of catalytically active centers and provides more nucleation centers for Li 2 O 2 , thereby improving the mass transfer efficiency of batteries. [28][29][30][31][32][33][34][35][36][37][38] Current modification methods for spinel metal oxides focus on controlling the material's morphology and adjusting the electronic configuration of octahedral sites coinciding with O-2p orbitals, 29,39 but the role of tetrahedral sites in the oxygen-containing intermediates during the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) processes is not fully understood. Previous studies have highlighted the catalytic activity of surface tetrahedral Co 2+ sites and octahedral Co 3+ sites in Co 3 O 4 , emphasizing the need to adsorb the oxygencontaining species with an optimized tetrahedral site in a three-dimensional open structure.…”