Preparation and formation process of Ni2+–Fe3+ CO32− LDHs materials with high crystallinity and well-defined hexagonal shapes

Han, Yinfeng; Li, Hongjuan; Ma, Xiangrong; Liu, Zong–Huai

doi:10.1016/j.solidstatesciences.2009.08.016

Cited by 29 publications

(16 citation statements)

References 34 publications

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“…However, the pH for their precipitation increases in the presence of ACAC because ACAC forms a complex with Fe 3+ and Ni 2+ having high solubility (2 g/L and 4 g/L, respectively). In addition, ACAC more preferably coordinates to the metal ions at pH above 8.9 owing to the p K a of ACAC, which might induce redissolution of the metal ions from already-formed metal hydroxide precipitate . Therefore, it is suggested that the inflection points in the pH change at pH 6.5 and pH 8 to 9 were due to the OH – consumption by Fe 3+ hydroxide precipitation and by LDH formation through the reaction between precipitating Ni 2+ or Ni 2+ -ACAC and redissolved Fe 3+ -ACAC, respectively .…”

Section: Resultsmentioning

confidence: 99%

“…In addition, ACAC more preferably coordinates to the metal ions at pH above 8.9 owing to the pK a of ACAC, which might induce redissolution of the metal ions from already-formed metal hydroxide precipitate. 50 Therefore, it is suggested that the inflection points in the pH change at pH 6.5 and pH 8 to 9 were due to the OH − consumption by Fe 3+ hydroxide precipitation and by LDH formation through the reaction between precipitating Ni 2+ or Ni 2+ -ACAC and redissolved Fe 3+ -ACAC, respectively. 50 The solation of the reaction mixture at around pH 9 also indicate the redissolution of Fe 3+ from Fe hydroxide precipitate by coordinating with ACAC, followed by the LDH formation.…”

Section: Methodsmentioning

confidence: 99%

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Single Nanometer-Sized NiFe-Layered Double Hydroxides as Anode Catalyst in Anion Exchange Membrane Water Electrolysis Cell with Energy Conversion Efficiency of 74.7% at 1.0 A cm^–2

et al. 2020

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We used a liquid phase reaction to synthesize a nickel (Ni) and iron (Fe)-containing layered double hydroxide (NiFe-LDH), having a lateral size less than 10 nm. A chelating agent introduced into the media was thought to increase the concentration of metal hydroxide nuclei and suppress excessive growth of the LDH crystal, resulting in the synthesis of nanometer-sized LDH. The NiFe-LDH catalyzed the oxygen evolution reaction (OER) at an overpotential of 247 mV and current of 10 mA cm–2, which is superior to the performance of conventional iridium oxide (IrO x ) catalysts. Notably, a membrane electrode assembly (MEA) for anion exchange membrane water electrolysis using NiFe-LDH as an anode catalyst exhibited an energy conversion efficiency of 74.7% for flowing 1.0 A cm–2 in 1 M KOH at 80 °C. This efficiency is the highest among MEAs implemented with non-noble metal-based catalysts reported to date and offers a viable replacement for IrO x anode catalysts.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Single Nanometer-Sized NiFe-Layered Double Hydroxides as Anode Catalyst in Anion Exchange Membrane Water Electrolysis Cell with Energy Conversion Efficiency of 74.7% at 1.0 A cm^–2

et al. 2020

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“…Other chelating agents have also been proposed. For example, trisodium citrate (TSC) has been proposed as chelating agent during urea hydrolysis in order to reduce the amount of amorphous FeOxHy particles . Triethanolamine (TEA) is reported as another chelating agent in combination with a Fe 2+ salt or a Fe 3+ salt to better match the precipitation of Fe and Ni hydroxides and avoid nonsoluble metallic oxide .…”

Section: Synthesis Of Nife‐based Oxy(hydroxide) Catalystsmentioning

confidence: 99%

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

Dionigi

Strasser

2016

Advanced Energy Materials

827

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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“…(4) and (5)]. H an et al [35] have introduced trisodium citrate (C 6 H 5 Na 3 O 7 ·H 2 O, TSC) as ac helating agent and have successfully fabricated NiFeL DHs with high crystallinity and ar elatively large surface area. As the pH value in-creases,a morphous Fe(OH) 3 is initially formed [Eq.…”

Section: Urea Hydrolysismentioning

confidence: 99%

Recent Advances in the Synthesis of Layered, Double‐Hydroxide‐Based Materials and Their Applications in Hydrogen and Oxygen Evolution

Yan

Jin

2016

Energy Tech

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Layered double hydroxides (LDHs) consist of brucite‐like layers containing hydroxides of two or more different kinds of metal cations. These positively charged layers are neutralized by exchangeable anions in the interlayer galleries. LDH‐based materials have substantial potential in efficient energy (e.g., H2, O2) generation. Over the last few decades, tremendous progress has been made toward developing LDH‐based materials for H2 and O2 evolution, for which the performance of LDH‐based materials is closely related to the synthesis method. This minireview initially outlines the recent advances in the synthesis of LDH‐based materials. The advantages and challenges of the protocols in tuning the properties of the material are also discussed and highlighted. The application section concentrates on the most recent progress in photocatalytic H2 generation and photocatalytic and electrocatalytic O2 evolution. By taking advantage of the flexible tunability and uniform distribution of metal cations in the brucite‐like layers or the intercalated anions in the interlayer space, LDH‐based materials exhibit attractive properties in the generation of H2 and O2 with advantages such as improved light absorption, enhanced charge separation, better electron transfer, promoted electrode reaction kinetics, and high durability.

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Preparation and formation process of Ni2+–Fe3+ CO32− LDHs materials with high crystallinity and well-defined hexagonal shapes

Cited by 29 publications

References 34 publications

Single Nanometer-Sized NiFe-Layered Double Hydroxides as Anode Catalyst in Anion Exchange Membrane Water Electrolysis Cell with Energy Conversion Efficiency of 74.7% at 1.0 A cm^–2

Single Nanometer-Sized NiFe-Layered Double Hydroxides as Anode Catalyst in Anion Exchange Membrane Water Electrolysis Cell with Energy Conversion Efficiency of 74.7% at 1.0 A cm^–2

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

Recent Advances in the Synthesis of Layered, Double‐Hydroxide‐Based Materials and Their Applications in Hydrogen and Oxygen Evolution

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Preparation and formation process of Ni2+–Fe3+ CO32− LDHs materials with high crystallinity and well-defined hexagonal shapes

Cited by 29 publications

References 34 publications

Single Nanometer-Sized NiFe-Layered Double Hydroxides as Anode Catalyst in Anion Exchange Membrane Water Electrolysis Cell with Energy Conversion Efficiency of 74.7% at 1.0 A cm–2

Single Nanometer-Sized NiFe-Layered Double Hydroxides as Anode Catalyst in Anion Exchange Membrane Water Electrolysis Cell with Energy Conversion Efficiency of 74.7% at 1.0 A cm–2

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

Recent Advances in the Synthesis of Layered, Double‐Hydroxide‐Based Materials and Their Applications in Hydrogen and Oxygen Evolution

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Product

Resources

About

Single Nanometer-Sized NiFe-Layered Double Hydroxides as Anode Catalyst in Anion Exchange Membrane Water Electrolysis Cell with Energy Conversion Efficiency of 74.7% at 1.0 A cm^–2

Single Nanometer-Sized NiFe-Layered Double Hydroxides as Anode Catalyst in Anion Exchange Membrane Water Electrolysis Cell with Energy Conversion Efficiency of 74.7% at 1.0 A cm^–2