“Structural instability” induced high-performance NiFe layered double hydroxides as oxygen evolution reaction catalysts for pH-near-neutral borate electrolyte: The role of intercalates

Yan, Dong; Komarneni, Sridhar; Zhang, Fu; Wang, Ni; Terrones, Mauricio; Hu, Wencheng; Huang, Wenyan

doi:10.1016/j.apcatb.2019.118343

Cited by 44 publications

(34 citation statements)

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“…Komarneni et al intercalated dicarboxylic acids, adipic acid and succinic acid into the interlayer spaces of NiFe-LDHs and studied the effect of basal spacing on the OER activity. 178 Their findings suggested that the pillaring of NiFe-LDHs with large organic anions was a promising method to create LDH-type high-performance catalysts for the OER in a pH-near-neutral electrolyte. The enlarged basal spacing in the above studies benefited the OER performance of the LDHs by providing more space for mass diffusion and exposing more inner active sites for oxygen evolution.…”

Section: Host-guest Interaction In Ldhsmentioning

confidence: 99%

Layered double hydroxide-based electrocatalysts for the oxygen evolution reaction: identification and tailoring of active sites, and superaerophobic nanoarray electrode assembly

et al. 2021

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Section: Host-guest Interaction In Ldhsmentioning

confidence: 99%

Layered double hydroxide-based electrocatalysts for the oxygen evolution reaction: identification and tailoring of active sites, and superaerophobic nanoarray electrode assembly

et al. 2021

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“…Li et al [146] developed an in situ intercalation method to prepare formamide intercalated NiFe-LDHs electrodes, and the corresponding interlayer spacing increased from 7.8 Å to 9.5 Å. More importantly, compared with ex situ intercalation/exfoliation approach, the in situ intercalation method largely maintained the good interfacial connection and long-term stability of LDHs materials, which provided an overpotential of 203 mV at 10 mA cm −2 and a stability of up to 16 h. Komarneni et al [147] intercalated several dicarboxylic acids of different alkyl chain lengths (suberic acid, adipic acid and succinic acid) into the interlayer spaces of NiFe-LDHs and studied the effect of basal spacing on the OER activity. It was discovered that suberic acid, intercalated in NiFe-LDH, exhibited a remarkable activity for OER in a pH-near-neutral K-B i electrolyte (pH = 9.2), which was mainly ascribed to the "structural instability" induced "in situ" anion exchange" process in which borate anions entered the interlayer and activated inner Ni sites.…”

Section: Intercalationmentioning

confidence: 99%

Recent Progress on Transition Metal Based Layered Double Hydroxides Tailored for Oxygen Electrode Reactions

et al. 2021

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The oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), namely, so-called oxygen electrode reactions, are two fundamental half-cell reactions in the energy storage and conversion devices, e.g., zinc–air batteries and fuel cells. However, the oxygen electrode reactions suffer from sluggish kinetics, large overpotential and complicated reaction paths, and thus require efficient and stable electrocatalysts. Transition-metal-based layered double hydroxides (LDHs) and their derivatives have displayed excellent catalytic performance, suggesting a major contribution to accelerate electrochemical reactions. The rational regulation of electronic structure, defects, and coordination environment of active sites via various functionalized strategies, including tuning the chemical composition, structural architecture, and topotactic transformation process of LDHs precursors, has a great influence on the resulting electrocatalytic behavior. In addition, an in-depth understanding of the structural performance and chemical-composition-performance relationships of LDHs-based electrocatalysts can promote further rational design and optimization of high-performance electrocatalysts. Finally, prospects for the design of efficient and stable LDHs-based materials, for mass-production and large-scale application in practice, are discussed.

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“…For the first time, we discovered that sebacate anion intercalated NiFe LDH (NiFe LDH Seb) and suberate anion intercalated NiFe LDH (NiFe LDH Sub) are remarkable OER catalysts in the pH‐n‐n borate electrolyte (K–B i , pH = 9.2), which outperformed the RuO 2 catalyst. NiFe LDH Seb only needed an overpotential of 376 mV to reach 1 mA cm −2 [ 153 ] and NiFe LDH Sub achieved 1 mA cm −2 with an overpotential of 387 mV, [ 154 ] while at the same time RuO 2 needed an overpotential of 393 mV to reach the same current density. Besides, NiFe LDH Seb and NiFe LDH Sub both showed great OER stability for at least 24 h. Interestingly, we also found that all the dicarboxylic anions intercalated NiFe LDHs had much better OER performances than the regular carbonate NiFe LDH.…”

Section: Borate Systemmentioning

confidence: 99%

Strategies to Develop Earth‐Abundant Heterogeneous Oxygen Evolution Reaction Catalysts for pH‐Neutral or pH‐Near‐Neutral Electrolytes

Yan

Komarneni

2020

Small Methods

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to find alternative energy supplies that are inexpensive, clean, and sustainable. Intermittent energy such as wind energy and solar energy is clean, sustainable, and expected to be carbon-neutral. The challenge of utilization of these intermittent energy sources mainly lies in the conversion and storage of the electrical energy obtained from wind turbines and photovoltaic cells, since the electricity generated from these energy sources is intermittent. A promising way to convert and store this electrical energy is to convert and store it in the form of solar fuels with high-energy density, such as H 2 , which can be produced from electricity-driven water splitting process. Many efforts have been made to develop cost-effective electrochemical processes, which can convert the electrical energy to fuel or valuable chemical products such as water splitting, [3] electrochemical reduction of carbon dioxide (CRR), [4] and electrochemical reduction of nitrogen (N 2 RR). [5] In these electrochemical processes, fuels and chemical products are all produced at cathode, while the most common reaction that happens at the anode is oxygen evolution reaction (OER). This reaction is a multistep reaction involving the transfer of four electrons, resulting in sluggish reaction kinetics. [6-8] In fact, it has become the main bottleneck that limits these electrochemical processes from practical application. In order to drive the electrochemical reaction to occur at a considerable rate, a large overpotential-a potential in addition to the equilibrium potential of OER, is required to overcome the reaction barriers of OER to attain a given catalytic performance, which significantly increases the energy cost. Therefore, in order to lower the energy cost to make these electrochemical processes more cost-efficient, high-performance OER catalysts are needed to lower the reaction barriers, especially for pH-neutral (pH-n) or pH-near-neutral (pH-n-n) conditions. The oxidation of water will generate a large number of protons at the anode, which need to be accommodated or transported away. Besides, for transition metal OER catalysts such as Ni/Co (oxy)hydroxides, before the onset of OER, the transition metals need to be activated to higher valence states usually through a process called proton-coupled electron transfer (PCET), in which the removal of one electron from the transition metal is coupled with the transfer of one proton from the The anodic oxygen evolution reaction (OER) is the bottleneck of water splitting to produce hydrogen due to its sluggish kinetics. In order to lower the energy cost, highly active and cost-efficient OER catalysts need to be used to overcome the OER reaction barrier, especially in neutral pH. Compared to alkaline or acidic electrolytes, pH-neutral or pH-near-neutral electrolytes are considered to be cheaper and safer, and water from rivers and the sea could be used directly under such conditions. However, OER under neutral pH is challenging compared to the OER catalysts for alkaline conditions. Therefore, OER ca...

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“Structural instability” induced high-performance NiFe layered double hydroxides as oxygen evolution reaction catalysts for pH-near-neutral borate electrolyte: The role of intercalates

Cited by 44 publications

References 58 publications

Layered double hydroxide-based electrocatalysts for the oxygen evolution reaction: identification and tailoring of active sites, and superaerophobic nanoarray electrode assembly

Layered double hydroxide-based electrocatalysts for the oxygen evolution reaction: identification and tailoring of active sites, and superaerophobic nanoarray electrode assembly

Recent Progress on Transition Metal Based Layered Double Hydroxides Tailored for Oxygen Electrode Reactions

Strategies to Develop Earth‐Abundant Heterogeneous Oxygen Evolution Reaction Catalysts for pH‐Neutral or pH‐Near‐Neutral Electrolytes

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