Accelerating oxygen evolution electrocatalysis of two-dimensional NiFe layered double hydroxide nanosheets <i>via</i> space-confined amorphization

Jiao, Shilong; Yao, Zhaoyu; Li, Mengfan; Mu, Ce; Liang, Huawei; Zeng, Yu‐Jia; Huang, Hongwen

doi:10.1039/c9nr07465a

Cited by 48 publications

(19 citation statements)

References 51 publications

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“…Fig. 2d shows the PL spectra of a-FeMo-1/7 and c-FeMo-1/7, which display a strong PL emission peak at~435 nm that corresponds to the recombination of holes in the disordered area of the electrocatalyst [46]. The PL spectra of the FeMo electrocatalysts with different Fe/Mo ratios also show obvious PL emission peaks, as indicated in Fig.…”

Section: Chemical and Electronic Configurationmentioning

confidence: 83%

“…This result reveals the higher density of active sites for a-FeMo-1/7. The largest ECSA value of the a-FeMo-1/7 electrocatalyst indicates the maximum number of active sites, which may originate from the disordered arrangement of atoms [46]. Despite the high density of active sites, the electrical transport properties revealed by electrochemical impedance spectroscopy (EIS) verify that the a-FeMo-1/7 electrocatalyst exhibits lower charge-transfer resistance and higher charge transport properties at different overpotentials (Fig.…”

Section: Nrr Electrochemical Evaluationmentioning

confidence: 95%

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Breaking the periodic arrangement of atoms for the enhanced electrochemical reduction of nitrogen and water oxidation

Jiao

Ruan

et al. 2021

Sci. China Mater.

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The development of cost-effective and highperformance electrocatalysts has been increasingly studied to mitigate upcoming energy and environmental challenges. Amorphization and heterointerface engineering have played significant roles in the rational design of electrocatalysts and modulation of their electrocatalytic activities. However, the synergistic effect between amorphization and heterointerfaces has been scarcely reported. As a proof-of-concept attempt, we develop amorphous FeMo (a-FeMo) electrocatalysts with an abundance of heterointerfaces that are composed of amorphous components and evaluate their electrocatalytic performances toward the nitrogen reduction reaction and oxygen evolution reaction (OER). Benefitting from the synergistic effect between the amorphous nature of the a-FeMo electrocatalysts, which offer a high density of active sites, and significant electron redistribution at the heterointerfaces, the electrocatalysts exhibit a high Faradaic efficiency of 29.15%, an elevated yield rate of 71.78 µg mg h NH cat .1 1 3 with long-term stability at a potential of −0.1 V vs. reversible hydrogen electrode and excellent electrocatalytic activity toward the OER. This study provides a promising and effective method for the rational design of low-cost heterogeneous catalysts with desirable efficiency, selectivity, and stability.

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Section: Chemical and Electronic Configurationmentioning

confidence: 83%

Section: Nrr Electrochemical Evaluationmentioning

confidence: 95%

Breaking the periodic arrangement of atoms for the enhanced electrochemical reduction of nitrogen and water oxidation

Jiao

Ruan

et al. 2021

Sci. China Mater.

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“…A partially amorphized NiFe‐LDH catalyst (SCA‐NiFe‐LDH) has also been successfully prepared by Huang et al [ 157 ] As displayed in Figure a,b, according to the high‐angle annular dark‐field scanning transmission electron microscopy (HAADF‐STEM) result, the pristine crystalline NiFe‐LDH (p‐NiFe‐LDH) had clear lattice fringes, indicating that the p‐NiFe‐LDH has long‐range ordering. When p‐NiFe‐LDH was treated with 5 m NaOH at 90 °C for 1 h, the amorphized SCA‐NiFe‐LDH was obtained.…”

Section: Electronic Tuning Strategies For 2d Metal (Hydr)oxides Electmentioning

confidence: 99%

“…According to recent reports on vacancy-rich 2D metal-based (hydr)oxide nanosheets, oxygen vacancy having relative low formation energy is the permission. [157] Copyright 2019, The Royal Society of Chemistry. most common anion vacancy.…”

Section: Vacancy Engineeringmentioning

confidence: 99%

“…2014 [133] Ultrafine NiFe-LDH nanosheets Defects engineering/Strain adjustment OER 1 m KOH 254 32 2018 [143] Mn doped Co 3 O 4 nanosheet Defects engineering/Strain adjustment OER 1 m KOH 332@50 mA cm −2 60 2019 [148] NiFe LDH nanosheet Defects engineering/Amorphization configuration OER 1 m KOH 233@30 mA cm −2 38 2018 [199] space-confined amorphous NiFe-LDH Defects engineering/Amorphization configuration OER 1 m KOH 190 31 2019 [157] P-MoO 3 −x nanosheets Defects engineering/Oxygen vacancy HER 0.5 m H 2 SO 4 166 42 2017 [166] Iron-cobalt oxide nanosheets Defects engineering/Oxygen vacancy OER 0.1 m KOH 308 36.8 2017 [200] Concave Bi 2 WO 6 nanoplates Defects engineering/Oxygen vacancy OER 0.5 m Na 2 SO 4 540 N.A. 2016 [201] Ultrathin [203] NiFe LDHs nanosheets Defects engineering/Cation Vacancies OER 1 m KOH 229 62.9 2018 [112] Ultrathin CoFe LDHs-Ar nanosheets Defects engineering/Multiple vacancies OER 1 m KOH 266 37.85 2017 [204] CoFe LDH nanosheets Defects engineering/Multiple vacancies OER 1 m KOH 290 36 2017 [205] NiFe LDH-NS@DG Heterostructure engineering OER 1 m KOH 210 52 2017 [176] HER 300 110…”

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Electronic Structure Tuning of 2D Metal (Hydr)oxides Nanosheets for Electrocatalysis

Song

Liao

et al. 2020

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2D metal (hydr)oxide nanosheets have captured increasing interest in electrocatalytic applications aroused by their high specific surface areas, enriched chemically active sites, tunable physiochemical properties, etc. In particular, the electrocatalytic reactivities of materials greatly rely on their surface electronic structures. Generally speaking, the electronic structures of catalysts can be well adjusted via controlling their morphologies, defects, and heterostructures. In this Review, the latest advances in 2D metal (hydr)oxide nanosheets are first reviewed, including the applications in electrocatalysis for the hydrogen evolution reaction, oxygen reduction reaction, and oxygen evolution reaction. Then, the electronic structure–property relationships of 2D metal (hydr)oxide nanosheets are discussed to draw a picture of enhancing the electrocatalysis performances through a series of electronic structure tuning strategies. Finally, perspectives on the current challenges and the trends for the future design of 2D metal (hydr)oxide electrocatalysts with prominent catalytic activity are outlined. It is expected that this Review can shed some light on the design of next generation electrocatalysts.

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Charge Regulation on Hybrid Nanosheet Stereoassembly via Interfacial PO Coupling Enables Efficient Overall Water Splitting

Wang

et al. 2023

Adv Funct Materials

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Precise regulation on interfacial electronic coupling is essential to achieve efficient catalysts with tailored electrocatalytic behaviors but remains challenging. Herein, a straightforward topochemical strategy is presented to realize Co-based heterostructured nanofiber stereoassembled with PO coupled nanosheet (CoHF/PO). By constructing well-defined metal oxide/ phosphide interface, prominent electron redistribution can be established via interfacial PO coupling, which is strongly correlated with the catalytic activities. Density functional theory calculations indicate that the rational interface engineering renders accelerated charge transfer and more importantly, optimized surface adsorption/desorption behaviors, contributing to boosted kinetics for both hydrogen evolution reaction and oxygen evolution reaction. Particularly, CoHF/PO featuring promoted intrinsic activity and accessible active sites exhibits intriguing activity and stability at higher current densities in alkaline media, surpassing commercial Pt/C and Ir/C. This study is expected to demonstrate noteworthy promise of covalent coupling toward modulated electronic environment and interface chemistry for electrocatalytic applications and beyond.

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Accelerating oxygen evolution electrocatalysis of two-dimensional NiFe layered double hydroxide nanosheets via space-confined amorphization

Abstract: Boosting OER activity of the ultrathin 2D NiFe-LDH nanosheets via the introduction of space-confined amorphism that induces the increased active sites and optimized electronic structure.

Cited by 48 publications

References 51 publications

Breaking the periodic arrangement of atoms for the enhanced electrochemical reduction of nitrogen and water oxidation

Breaking the periodic arrangement of atoms for the enhanced electrochemical reduction of nitrogen and water oxidation

Electronic Structure Tuning of 2D Metal (Hydr)oxides Nanosheets for Electrocatalysis

Charge Regulation on Hybrid Nanosheet Stereoassembly via Interfacial PO Coupling Enables Efficient Overall Water Splitting

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