Interlayer ligand engineering of β-Ni(OH)2 for oxygen evolution reaction

He, Junying; Zou, Yuqin; Huang, Yu‐Cheng; Li, Chenhui; Liu, Yanbo; Zhou, Ling; Dong, Chung‐Li; Lu, Xia; Wang, Shuangyin

doi:10.1007/s11426-020-9844-2

Cited by 19 publications

(21 citation statements)

References 42 publications

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“…The density of states analysis for the Ni atom (Figure 5h) show the dband center of ENWs-FeNi-OOH upshifts to Fermi level, which reduced the anti-bonding filling states in the d orbital, facilitating the more electrons on 3d orbitals of Ni cations delocalization and leading to the higher average valence of Ni in ENWs-FeNi-OOH than that of FeNi-OOH. [50,51] Furthermore, the calculated energy barrier results for each OER step in FeNi-OOH (Table S3, Supporting Information) show that the formation of *OOH is rate-determining step (RDS) of the OER process. [52,53] Compared with OC-FeNi-OOH catalyst, the energy barrier for RDS step (ΔG 3 ) in ENWs-FeNi-OOH is obviously decreased, indicating that the introduction of ethoxy in FeNi-OOH can efficiently facilitate the formation step of *OOH and OER performance.…”

Section: Catalytic Mechanism For Oxygen Evolution Reactionmentioning

confidence: 99%

“…Based on the above results, the OER catalytic mechanism of the novel 3D ENWs-FeNi-C 2 O 4 network structure catalyst was proposed, as shown in Figure 6. During OER process, because the OH − consumption is greater than OH − absorption at a relative high current density, [50] the OH adsorption step (Step 1) can also play an important role in OER performance. The as-prepared ENWs-FeNi-OOH nanowires network catalyst with the abundant hydrophilic channels has a better affinity to the electrolyte, which is conducive to increase the contact area between the catalysts and electrolytes, significantly improving the OH adsorption step.…”

Section: Catalytic Mechanism For Oxygen Evolution Reactionmentioning

confidence: 99%

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Novel FeNi‐Based Nanowires Network Catalyst Involving Hydrophilic Channel for Oxygen Evolution Reaction

Qiao

Kang

et al. 2022

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Developing novel, efficient, and low‐cost 3D FeNi‐based oxygen evolution reaction (OER) catalysts with the special hydrophilic channel is still a challenge for improving hydrogen production efficiency. Herein, a novel 3D ethoxy substituted FeNi oxalate (ENWs‐FeNi‐C2O4) nanowires network catalyst with hydrophilic channels is reported firstly, which shows an outstanding OER activity with a low overpotential (215 mV at 10 mA cm−2) and small Tafel slope (54.5 mV dec−1). OER catalytic mechanism indicates that the OH adsorption step and O2 bubble diffusion step of OER reaction process can be significantly improved due to the special hydrophilic channels, and the ethoxy as an interlayer ligand not only expands the interlayer distance of layered FeNi (oxy) hydroxide true active species but modulates its electronic structure, promoting the *OOH formation step, and thus exhibiting the outstanding OER performance. This work provides a novel idea for the preparation of novel and efficient OER electro‐catalysts with special 3D structures.

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Section: Catalytic Mechanism For Oxygen Evolution Reactionmentioning

confidence: 99%

Section: Catalytic Mechanism For Oxygen Evolution Reactionmentioning

confidence: 99%

Novel FeNi‐Based Nanowires Network Catalyst Involving Hydrophilic Channel for Oxygen Evolution Reaction

Qiao

Kang

et al. 2022

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“…e.g., [K(H 2 O) n ] + . Intercalated ions that are in the interlayer space influencing the spacing, e.g., carbonate bond through hydrogen bonds with the layers’ OH groups [25] Substitution of the hydroxide groups by other species inside the layers and at the surface by covalent bonding, e.g., methoxy, replacing M−OH with M−OMe bonds [26, 27] …”

Section: Structural Aspects Of the Surface‐adsorption And Intercalati...mentioning

confidence: 99%

“…Alkoxides likely oxidize under OER conditions, [83] alkoxide can replace the OH groups of LDH [26, 27] …”

Section: The Effect Of Intercalated (Oxy)anionsmentioning

confidence: 99%

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Effect of Surface‐Adsorbed and Intercalated (Oxy)anions on the Oxygen Evolution Reaction

Hausmann

Menezes

2022

Angewandte Chemie

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As the kinetically demanding oxygen evolution reaction (OER) is crucial for the decarbonization of our society, a wide range of (pre)catalysts with various non‐active‐site elements (e.g., Mo, S, Se, N, P, C, Si…) have been investigated. Thermodynamics dictate that these elements oxidize during industrial operation. The formed oxyanions are water soluble and thus predominantly leach in a reconstruction process. Nevertheless, recently, it was unveiled that these thermodynamically stable (oxy)anions can adsorb on the surface or intercalate in the interlayer space of the active catalyst. There, they tune the electronic properties of the active sites and can interact with the reaction intermediates, changing the OER kinetics and potentially breaking the persisting OER *OH/*OOH scaling relations. Thus, the addition of (oxy)anions to the electrolyte opens a new design dimension for OER catalysis and the herein discussed observations deepen the understanding of the role of anions in the OER.

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Fe²⁺‐Induced In Situ Intercalation and Cation Exsolution of Co₈₀Fe₂₀(OH)(OCH₃) with Rich Vacancies for Boosting Oxygen Evolution Reaction

Liu

Huang

et al. 2021

Adv Funct Materials

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The efficiency of water splitting is largely hindered by the sluggish kinetics of the oxygen evolution reaction. Cobalt‐based (oxy)hydroxides are promising electrocatalysts, but their performance is still under the expected goal due to the restricted active sites and intrinsic activity. Herein, Co80Fe20(OH)(OCH3) (CoFeMe) is synthesized with intercalation and rich vacancies by a cation exsolution process in a one‐step solve‐thermal reaction. With the help of the Fe incorporation, the specific surface area of CoFeMe increases to 101.6 m2 g−1, which is six times that of Co(OH)(OCH3) (CoMe) (16.5 m2 g−1). Also, the induced rich vacancies are traced in the X‐ray absorption spectra of CoFeMe. Because of the synergistic effect between the intercalation, Fe incorporation and vacancies, the overpotential of CoFeMe is only 240 mV to drive the current density to 10 mA cm−2, which is reduced 110 mV compared with that of pristine CoMe (350 mV).

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Interlayer ligand engineering of β-Ni(OH)2 for oxygen evolution reaction

Cited by 19 publications

References 42 publications

Novel FeNi‐Based Nanowires Network Catalyst Involving Hydrophilic Channel for Oxygen Evolution Reaction

Novel FeNi‐Based Nanowires Network Catalyst Involving Hydrophilic Channel for Oxygen Evolution Reaction

Effect of Surface‐Adsorbed and Intercalated (Oxy)anions on the Oxygen Evolution Reaction

Fe²⁺‐Induced In Situ Intercalation and Cation Exsolution of Co₈₀Fe₂₀(OH)(OCH₃) with Rich Vacancies for Boosting Oxygen Evolution Reaction

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Interlayer ligand engineering of β-Ni(OH)2 for oxygen evolution reaction

Cited by 19 publications

References 42 publications

Novel FeNi‐Based Nanowires Network Catalyst Involving Hydrophilic Channel for Oxygen Evolution Reaction

Novel FeNi‐Based Nanowires Network Catalyst Involving Hydrophilic Channel for Oxygen Evolution Reaction

Effect of Surface‐Adsorbed and Intercalated (Oxy)anions on the Oxygen Evolution Reaction

Fe2+‐Induced In Situ Intercalation and Cation Exsolution of Co80Fe20(OH)(OCH3) with Rich Vacancies for Boosting Oxygen Evolution Reaction

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Fe²⁺‐Induced In Situ Intercalation and Cation Exsolution of Co₈₀Fe₂₀(OH)(OCH₃) with Rich Vacancies for Boosting Oxygen Evolution Reaction