Effect of interlayer anions on [NiFe]-LDH nanosheet water oxidation activity

Hunter, Bryan M.; Hieringer, Wolfgang; Winkler, Jay R.; Müller, Astrid M.

doi:10.1039/c6ee00377j

Cited by 455 publications

(402 citation statements)

References 49 publications

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“…TheO À Ce À Ovibration remained broad and shifted to lower wavenumber compared to commercial CeO 2 .X PS spectra also showed that the coexistence of Ce 3+ and Ce 4+ was retained, along with the coexistence of the oxide and hydroxide,a fter anodic polarization (Supporting Information, Figure S4 c,d). [5d] It is consistent with the claim in the literature that only limited amount of Fe was highly active sites [15] and those sites were lost, which could not be quantified by our ICP measurement. From ICP measurement, the amount of Fe in the bare NiFeO x remained unchanged after stability test (Supporting Information, Table S1) in contrast with the previous report observing content of Fe dropped from 50 % to 25 %.…”

Section: Angewandte Chemiesupporting

confidence: 91%

A Permselective CeO_x Coating To Improve the Stability of Oxygen Evolution Electrocatalysts

Obata

Takanabe

2018

Angewandte Chemie

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Highly active NiFeO x electrocatalysts for the oxygen evolution reaction (OER) suffer gradual deactivation with time owingtothe loss of Fe species from the active sites into solution during catalysis.T he anodic deposition of aC eO x layer prevents the loss of such Fe species from the OER catalysts, achieving ah ighly stable performance.T he CeO x layer does not affect the OER activity of the catalyst underneath but exhibits unique permselectivity,a llowing the permeation of OH À and O 2 through while preventing the diffusion of redox ions through the layer to function as as elective O 2 -evolving electrode.T he use of such ap ermselective protective layer provides an ew strategy for improving the durability of electrocatalysts.Hydrogen is an energy carrier that can effectively store intermittent energy generated by renewable energy sources, such as solar and wind power. Many techniques,such as water electrolysis and photoelectrochemical water splitting, have been studied for the generation of hydrogen and oxygen from water. Unlike the hydrogen evolution reaction (HER) conducted on the cathodic side,t he anodic oxygen evolution reaction (OER) is ak inetically sluggish reaction, requiring as ubstantial overpotential. Highly active,d urable,a nd costeffective electrocatalysts for OER are desired for the development of an efficient water splitting device.NiFeO x is one of the most active electrocatalysts for OER in alkaline conditions,and while it is known that Fe plays acritical role in the improved activity, [1] the origin of the enhancement of the OER kinetics by Fe doping is still under debate.A lthough many studies have been devoted to decreasing the overpotential via the development of an LDH structure, [2]

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Section: Angewandte Chemiesupporting

confidence: 91%

A Permselective CeO_x Coating To Improve the Stability of Oxygen Evolution Electrocatalysts

Obata

Takanabe

2018

Angewandte Chemie

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“…The intercalated NO 3 − anion increases the interlayer distance respect to CO 3 2and it is easier to exchange by OH − , that is the main reactant for OER in alkaline. [110] The authors synthesized NiFebased materials with a wide variety of intercalated anions (NO 3 − , BF 4 − , Cl − , ClO 4 − , CO 3 2− , C 2 O 4 2− , F − , I − , PO 4 3− , SO 4 2− ) either by anion exchange of nitrate intercalated NiFe LDH or directly by PLAL. Therefore the authors attributed the enhanced activity to these effects.…”

Section: Nature Of Intercalated Anionsmentioning

confidence: 99%

NiFe‐Based (Oxy)hydroxide Catalysts for Oxygen Evolution Reaction in Non‐Acidic Electrolytes

Dionigi

Strasser

2016

Advanced Energy Materials

801

731

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NiFe‐based (oxy)hydroxides are highly active catalysts for the oxygen evolution reaction in alkaline electrolyte solutions. These catalysts can be synthesized in different ways leading to nanomaterials and thin films with distinct morphologies, stoichiometries and long‐range order. Notably, their structure evolves under oxygen evolution operating conditions with respect to the as‐synthesized state. Therefore, many researchers have dedicated their efforts on the identification of the catalytic active sites employing in operando experimental methods and theoretical calculations. These investigations are pivotal to rationally design materials with outstanding performances that will constitute the anodes of practical commercial alkaline electrolyzers. The family of NiFe‐based oxyhydroxide catalysts reported in recent years is addressed and the actual state of the research with special focus on the understanding of the oxygen‐evolution‐reaction active sites and phase is described. Finally, an overview on the proposed oxygen‐evolution‐reaction mechanisms occurring on NiFe‐based oxyhydroxide electrocatalysts is provided.

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“…[35][36][37] These steps strongly depend on the chemical nature of the catalyst. [35][36][37] These steps strongly depend on the chemical nature of the catalyst.…”

mentioning

confidence: 99%

Enhanced Electrocatalytic Oxygen Evolution in Au–Fe Nanoalloys

et al. 2017

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Oxygen evolution reaction (OER) is the most critical step in water splitting, still limiting the development of efficient alkaline water electrolyzers. Here we investigate the OER activity of Au-Fe nanoalloys obtained by laser-ablation synthesis in solution. This method allows a high amount of iron (up to 11 at %) to be incorporated into the gold lattice, which is not possible in Au-Fe alloys synthesized by other routes, due to thermodynamic constraints. The Au Fe nanoalloys exhibit strongly enhanced OER in comparison to the individual pure metal nanoparticles, lowering the onset of OER and increasing up to 20 times the current density in alkaline aqueous solutions. Such a remarkable electrocatalytic activity is associated to nanoalloying, as demonstrated by comparative examples with physical mixtures of gold and iron nanoparticles. These results open attractive scenarios to the use of kinetically stable nanoalloys for catalysis and energy conversion.

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Effect of interlayer anions on [NiFe]-LDH nanosheet water oxidation activity

Abstract: Water oxidation activity of nickel–iron layered double hydroxide ([NiFe]-LDH) nanosheet electrocatalysts is a function of interlayer anion basicity.

Cited by 455 publications

References 49 publications

A Permselective CeO_x Coating To Improve the Stability of Oxygen Evolution Electrocatalysts

A Permselective CeO_x Coating To Improve the Stability of Oxygen Evolution Electrocatalysts

NiFe‐Based (Oxy)hydroxide Catalysts for Oxygen Evolution Reaction in Non‐Acidic Electrolytes

Enhanced Electrocatalytic Oxygen Evolution in Au–Fe Nanoalloys

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Effect of interlayer anions on [NiFe]-LDH nanosheet water oxidation activity

Abstract: Water oxidation activity of nickel–iron layered double hydroxide ([NiFe]-LDH) nanosheet electrocatalysts is a function of interlayer anion basicity.

Cited by 455 publications

References 49 publications

A Permselective CeOx Coating To Improve the Stability of Oxygen Evolution Electrocatalysts

A Permselective CeOx Coating To Improve the Stability of Oxygen Evolution Electrocatalysts

NiFe‐Based (Oxy)hydroxide Catalysts for Oxygen Evolution Reaction in Non‐Acidic Electrolytes

Enhanced Electrocatalytic Oxygen Evolution in Au–Fe Nanoalloys

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A Permselective CeO_x Coating To Improve the Stability of Oxygen Evolution Electrocatalysts

A Permselective CeO_x Coating To Improve the Stability of Oxygen Evolution Electrocatalysts