Phthalocyanine-induced iron active species in metal–organic framework-derived porous carbon for efficient alkaline zinc–air batteries

Abstract

The oxygen reduction reaction (ORR) on the cathode is of great significance in fuel cells and metal-O2 batteries, which is well demonstrated and highly efficient in nature. Herein, iron phthalocyanine...

Highly exposed surface pore-edge FeNx sites for enhanced oxygen reduction performance in Zn-air batteries

“…These results demonstrate that SiO 2 can increase surface area and form abundant porous structures that are intertwined with sheets on the surface of the catalysts, which may enhance the mass/electron transport during the ORR process. [40][41][42][43][44] XRD patterns are shown in Fig. 2d for Fe 3 C-NC and SPE-FeN x -HPNC.…”

A hybridization cage-confinement pyrolysis strategy for ultrasmall Ni3Fe alloy coated with N-doped carbon nanotubes as bifunctional oxygen electrocatalysts for Zn–air batteries

“…3a, S10 and Table S1 † S2, † Ni 3 Fe-NCNTs-800 contains more Fe/Ni-N x , pyridinic N, and graphitic N (95.7% in total), which can contribute to both catalytic performance and electrical conductivity. 32 The ORR catalytic performance of the catalysts was investigated using a rotating disk electrode (RDE) in 0.1 M KOH. As shown in Fig.…”

“…3f and S14 and Table S2,† Ni 3 Fe-NCNTs-800 contains more Fe/Ni–N x , pyridinic N, and graphitic N (95.7% in total), which can contribute to both catalytic performance and electrical conductivity. 32…”

Abundant Surface Defects in Cobalt Hydroxides/Oxyhydroxides Induced by Zinc Species Facilitate Water Oxidation

“…On the other hand, microporous metal–organic frameworks (MOFs) are formed by the self-assembly between metal cations and organic ligands and are deemed effective precursors or templates for OER catalysts. − Due to their high specific surface area, large pore volume, and adjustable pore size, MOF materials and their derivatives have immense potential in gas storage and separation, , host–guest recognition, , electro/photocatalysis, − and more. As the coordination environments of different metals may be similar within isostructures, it is highly possible to rationally design and synthesize multimetal MOFs. − Furthermore, different metal sites in MOFs can exhibit different functions through appropriate treatment, enabling them to transform into highly active and stable catalytic nanomaterials. − In recent years, there has been extensive research on MOF-derived transition metal species, which are considered to be ideal OER catalysts that can replace noble metal catalysts. − Different types of metal derivatives play a crucial role, such as MOF-derived metal sulfides, nitrides, , selenides, phosphates, and hydroxides, which ensure effective resorption and desorption of reaction intermediates during catalysis, thereby reducing the energy required for OER reactions. However, the poor conductivity and small active area of metal hydroxides/oxyhydroxides limit their widespread use in OER.…”