Communication—Fe-MOF Exhibits Higher Oxygen Evolution Ability by Electronic Modulation of Sodium Hypochlorite

Abstract

Development of robust alkaline oxygen evolution reaction electrocatalysts is crucial for the efficiency of water splitting. Herein, Fe-MOF nanocones array on nickel foam are synthesized by introducing sodium hypochlorite, leading to Cl substitution of terephthalic acid in Fe-MOFs (Fe-MOF-Cl/NF). Experimental results show that Fe-MOF-Cl/NF exhibits enhanced OER activity over Fe-MOF/NF, lowering η 50 from 292.4 to 222.7 mV. In combination with density function theory calculations, the improved OER performance is attributed to engineering electronic structure of Fe sites which accelerate the third step from *O to *OOH, and promote OER kinetics. Additionally, Fe-MOF-Cl/NF can retain catalytic activity for 100 h.

Constructing MIL-53(Fe)@ZIF-67(Co) binary metal–organic framework hierarchical heterostructure electrodes for efficient oxygen evolution

“…S2 and S3,† ZIF-67(Co) and MIL-53(Fe) presented rhomboidal dodecahedron nanocrystal and nanosheet structures, respectively, which are consistent with studies reported in the literature. 34,35 The hierarchical structure of MIL-53(Fe)@ZIF-67(Co) is shown in Fig. 1c.…”

Nickel nanoparticle-embedded N-doped carbon catalysts formed by MOF derivatives for the oxygen evolution reaction

“…The metal center of a MOF is a multi-valent metal ion, which acts as the coordination active point in the reaction, and these coordination sites can be changed, so that the material can easily form a regular and adjustable three-dimensional structure. Considering the difficulty of the material source and the properties of the metal itself, Ni 2+ , 23,24 Fe 3+ , 25 Cu 2+ , 26 Co 2+ 27 and other transition metals are commonly used to synthesize MOF materials. 28…”

“…[18][19][20][21][22] The metal center of a MOF is a multi-valent metal ion, which acts as the coordination active point in the reaction, and these coordination sites can be changed, so that the material can easily form a regular and adjustable three-dimensional structure. Considering the difficulty of the material source and the properties of the metal itself, Ni 2+ , 23,24 Fe 3+ , 25 Cu 2+ , 26 Co 2+27 and other transition metals are commonly used to synthesize MOF materials. 28 Nickel is widely used as an OER electrocatalyst because of its good oxophilicity and the best oxygen evolution ability among the transition metals 29,30 and so Ni-MOFs have been attracting increasing attention in the field of catalysis.…”

One-pot synthesis of NiFe nanoarrays under an external magnetic field as an efficient oxygen evolution reaction catalyst

“…It is well known that Fe and Ni are magnetic ions, and their complex has excellent OER catalytic activity. [16][17][18][19][20] Unfortunately, from a broader perspective, the role of magnetism in the compounds of Fe and Ni in increasing their OER activity is still underestimated.…”