“The Fe Effect”: A review unveiling the critical roles of Fe in enhancing OER activity of Ni and Co based catalysts

Anantharaj, Sengeni; Kundu, Subrata; Noda, Suguru

doi:10.1016/j.nanoen.2020.105514

Cited by 605 publications

(432 citation statements)

References 89 publications

Supporting

Mentioning

409

Contrasting

Unclassified

Order By: Relevance

“…Generally, the addition of Fe into Ni-based electrocatalyst can modulate the surface electronic structure due to a high electrophilicity of iron resulting an enhanced OER catalytic activity and chemical stability. [12,13] Ni with Fe element undergoes the oxidation under a relatively lower activation threshold, which leads to increased amount of Ni 4+ and thus enhanced OER activity. [14] B and P elements are located in 6b and 12c Wyckoff position in a lattice, respectively, having tetrahedral coordination with oxygen atoms.…”

Section: Materials Structure Analysismentioning

confidence: 99%

Amorphous Nickel–Iron Borophosphate for a Robust and Efficient Oxygen Evolution Reaction

Kwon

Han

et al. 2021

Advanced Energy Materials

152

View full text Add to dashboard Cite

Borophosphate materials are promising electrocatalysts for water splitting. Their structural flexibility enable self‐adjusting of electronic structure depending on potential. The rich chemistry of borophosphate provides a huge engineering space to tune composition and structure. Herein, amorphized LiNiFe borophosphate (a‐LNFBPO) for an efficient and durable oxygen evolution reaction (OER) is first reported. Facile adsorption of oxygen intermediates on the vacancies generated by spontaneous Li dissolution during the OER and regulated electronic structure resulting from the Ni and Fe interaction can boost the OER. The amorphization of LiNiFe borophosphate modifies the electronic structure with metal‐oxygen (MO) bond contraction and the high valence state of the metal cations, which reduces the charge transfer energy between the catalyst and electrolyte. In addition, abundant defects, dangling bonds, and a disordered arrangement induced by amorphization enable an improvement in structural flexibility, facilitating a facile and entire transformation of originally inert species into the active phase during the OER process. The a‐LNFBPO@Ni foam shows excellent OER properties requiring only a 215 mV overpotential for generating 10 mA cm−2 and long‐term stability over 300 h.

show abstract

Section: Materials Structure Analysismentioning

confidence: 99%

Amorphous Nickel–Iron Borophosphate for a Robust and Efficient Oxygen Evolution Reaction

Kwon

Han

et al. 2021

Advanced Energy Materials

152

View full text Add to dashboard Cite

show abstract

“…[ 8,13,14 ] To overcome this drawback, iron has been successfully doped into conducting, oxidic matrixes of less abundant 3d metals such as cobalt or nickel. [ 8,15 ] Here, we successfully apply an alternative and potentially cheaper way to master the conductivity disadvantage of Fe III O x H y : the utilization of iron incorporated in the intermetallic iron silicide (FeSi) phase and bonded to the second most abundant element on the earth's crust, silicon. [ 16–18 ] In contrast to alloys, intermetallics possess ordered, particular structures, which are different than those of the constituent elements.…”

Section: Introductionmentioning

confidence: 99%

Evolving Highly Active Oxidic Iron(III) Phase from Corrosion of Intermetallic Iron Silicide to Master Efficient Electrocatalytic Water Oxidation and Selective Oxygenation of 5‐Hydroxymethylfurfural

et al. 2021

View full text Add to dashboard Cite

In a green energy economy, electrocatalysis is essential for chemical energy conversion and to produce value added chemicals from regenerative resources. To be widely applicable, an electrocatalyst should comprise the Earth's crust's most abundant elements. The most abundant 3d metal, iron, with its multiple accessible redox states has been manifold applied in chemocatalytic processes. However, due to the low conductivity of FeIIIOxHy phases, its applicability for targeted electrocatalytic oxidation reactions such as water oxidation is still limited. Herein, it is shown that iron incorporated in conductive intermetallic iron silicide (FeSi) can be employed to meet this challenge. In contrast to silicon‐poor iron–silicon alloys, intermetallic FeSi possesses an ordered structure with a peculiar bonding situation including covalent and ionic contributions together with conducting electrons. Using in situ X‐ray absorption and Raman spectroscopy, it could be demonstrated that, under the applied corrosive alkaline conditions, the FeSi partly forms a unique, oxidic iron(III) phase consisting of edge and corner sharing [FeO6] octahedra together with oxidized silicon species. This phase is capable of driving the oxyge evolution reaction (OER) at high efficiency under ambient and industrially relevant conditions (500 mA cm−2 at 1.50 ± 0.025 VRHE and 65 °C) and to selectively oxygenate 5‐hydroxymethylfurfural (HMF).

show abstract

“…For example, recent studies have proved that Fe doping into Ni-based catalysts can efficiently adjust the electronic structure, improve the electrical conductivity, and expose more surface area. 12 , 13 Taken together, Fe-doped Ni-based catalysts are reasonably expected to provide more favorable OER performance. However, the preparation of Fe-doped Ni-based OER electrocatalysts is quite challenging, and a facile synthetic strategy is highly desired.…”

Section: Introductionmentioning

confidence: 99%

MOF-Derived Fe-Doped Ni@NC Hierarchical Hollow Microspheres as an Efficient Electrocatalyst for Alkaline Oxygen Evolution Reaction

et al. 2021

View full text Add to dashboard Cite

The development of low-cost and efficient electrocatalysts for oxygen evolution reaction (OER) is of great importance for producing hydrogen via water splitting. Metal–organic frameworks (MOFs) provide an opportunity for the facile preparation of high-efficiency OER electrocatalysts. In this work, we prepared iron-doped nickel nanoparticles encapsulated in nitrogen-doped carbon microspheres (Fe-Ni@NC) with a unique hierarchical porous structure by directly pyrolyzing the MOF precursor for effectively boosting OER. The Fe doping has a significant enhancement effect on the catalytic performance. The optimized Fe (5%)-Ni@NC catalyst represents a remarkable activity with an overpotential of 257 mV at 10 mA cm –2 and superior stability toward OER in 1.0 M KOH.

show abstract

“The Fe Effect”: A review unveiling the critical roles of Fe in enhancing OER activity of Ni and Co based catalysts

Cited by 605 publications

References 89 publications

Amorphous Nickel–Iron Borophosphate for a Robust and Efficient Oxygen Evolution Reaction

Amorphous Nickel–Iron Borophosphate for a Robust and Efficient Oxygen Evolution Reaction

Evolving Highly Active Oxidic Iron(III) Phase from Corrosion of Intermetallic Iron Silicide to Master Efficient Electrocatalytic Water Oxidation and Selective Oxygenation of 5‐Hydroxymethylfurfural

MOF-Derived Fe-Doped Ni@NC Hierarchical Hollow Microspheres as an Efficient Electrocatalyst for Alkaline Oxygen Evolution Reaction

Contact Info

Product

Resources

About