Lattice oxygen-mediated Ni O O M formation for efficient oxygen evolution reaction in MOF@LDH core–shell structures

Liu, Ziqi; Li, Haoyu; Kang, Hung-Sen; N’Diaye, Alpha T.; Lee, Min Hwan

doi:10.1016/j.cej.2022.140403

Cited by 26 publications

(9 citation statements)

References 56 publications

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“…The collective pattern of Ni and Co/Fe valence states, coupled with oxygen vacancy concentrations, implies that the active metal centers (Ni and Co/Fe) directly engage with lattice oxygen to generate O 2 molecules in the course of the oxygen evolution activity. This aligns well with the LOM reported in the literature . Besides, the literature reveals that tuning M–O covalency in metal oxides can generate oxygen ligand holes or oxo radicals in the OER process, subsequently participating in lattice oxygen …”

Section: Resultssupporting

confidence: 91%

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In Situ Reconstructed Layered Double Hydroxides via MOF Engineering and Ru Doping for Decoupled Acidic Water Oxidation Enhancement

Vijayakumar,

Lenus,

Pradeeswari

et al. 2024

Energy Fuels

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Discovering cost-effective, durable, and economical electrocatalysts for the lattice oxygen-mediated mechanism (LOM)based oxygen evolution reaction (OER) under acidic conditions is essential for advancing the commercialization of electrochemical water-splitting devices. In this study, we effectively constructed a distinctive petal-like nanoflake (NFls) structure by introducing ruthenium (Ru) into a NiM (M = Fe, Co) metal−organic framework (MOF) on a nickel foam (NFo) substrate through a straightforward in situ conversion process of layered double hydroxides (LDHs). Utilizing the unique electrochemical properties of this material, the Ru-doped NiFe-BDC/NFo exhibited an impressively low overpotential of ∼247 mV at a current density of 10 mA cm −2 when operating in an acidic environment for OER. Most notably, our champion catalysts displayed exceptional long-term stability during continuous operation for 20 h in 0.5 M H 2 SO 4 , positioning them as some of the top electrocatalysts for acidic conditions. The exceptional catalytic performance of NiM (M = Fe, Co)-BDC/NFo can be ascribed to the introduction of Ru and the conversion of LDH into a MOF. This transformation significantly enhances reaction kinetics and facilitates charge transfer, ultimately resulting in the attainment of optimal activity for the OER. This research introduces a novel category of electrocatalysts for the OER under acidic conditions, which has been relatively underexplored.

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Section: Resultssupporting

confidence: 91%

“…This aligns well with the LOM reported in the literature. 87 Besides, the literature reveals that tuning M−O covalency in metal oxides can generate oxygen ligand holes or oxo radicals in the OER process, subsequently participating in lattice oxygen. 88 2.3.…”

Section: Analysis Of Surface Elements and Valencementioning

confidence: 99%

In Situ Reconstructed Layered Double Hydroxides via MOF Engineering and Ru Doping for Decoupled Acidic Water Oxidation Enhancement

Vijayakumar,

Lenus,

Pradeeswari

et al. 2024

Energy Fuels

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“…Therefore, the incorporation of the Ni dopant can modify the electronic structure of Co species in Co-MOFs, resulting in a slightly higher oxidation state [24,25]. Since Co 3+ is often considered as the main active site for OER, the increased content in this high oxidation state may be beneficial for enhancing OER catalytic activity [26][27][28]. Furthermore, the Ti 2p high-resolution spectrum (Figure 4b) shows peaks at 458.…”

Section: Catalyst Synthesis and Characterizationmentioning

confidence: 99%

Ni Doped Co-MOF-74 Synergized with 2D Ti3C2Tx MXene as an Efficient Electrocatalyst for Overall Water-Splitting

Yu,

Zhang,

et al. 2024

Catalysts

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Metal-organic framework (MOF)-based materials with abundant pore structure, large specific surface area, and atomically dispersed metal centers are considered as potential electrocatalysts for oxygen-evolution reaction (OER), while their ligand-saturated metal nodes are inert to electrocatalysis. In this work, heteroatom doping and interface engineering are proposed to improve the OER performance of Co-MOF-74. Using two-dimensional Ti3C2Tx MXene as a conductive support, Ni-doped Co-MOF-74 (CoNi-MOF-74/MXene/NF) was in situ synthesized through a hydrothermal process, which exhibits excellent OER and hydrogen evolution reaction (HER) properties. For OER, the CoNi-MOF-74/MXene/NF achieves a current density of 100 mA/cm2 at an overpotential of only 256 mV, and a Tafel slope of 40.21 mV/dec. When used for HER catalysis, the current density of 10 mA/cm2 is reached at only 102 mV for the CoNi-MOF-74/MXene/NF. In addition, the two-electrode electrolyzer with CoNi-MOF-74/MXene/NF as both the cathode and anode only requires 1.49 V to reach the current density of 10 mA/cm2. This work provides a new approach for the development of bimetallic MOF-based electrocatalysts.

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“…In recent years, industrial effluents containing heavy metal ions and organic pollutants have caused a serious threat to human health as well as the ecosystems because of their toxicity and bioaccumulation. [1][2][3][4] These toxic substances need to be removed from the contaminated wastewater urgently for the protection of environment. Though some efficient adsorbents for the adsorption of heavy metal ions and catalysts for the removal of organic pollutants have been explored, the adsorption-catalysis treatment to remove them simultaneously is still a challenge because of their different reaction mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Facile fabrication of highly efficient bifunctional polydopamine–polyethyleneimine copolymerization‐modified magnetic material and its effective applications for both adsorption of gold ions and catalytic reduction of 4‐nitrophenol

Wu,

Zhang,

Yin

et al. 2023

J of Applied Polymer Sci

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The heavy metal ions and organic pollutants are major harmful substances in wastewater because of their toxicity on human health and environment. Nowadays, the adsorption–catalysis treatment to remove them simultaneously is still a challenge because of their different reaction mechanisms. Herein, a novel bifunctional polymer magnetic material Fe3O4@PDA‐PEI was successfully developed through a facile co‐deposition method by the copolymerization modification of polydopamine (PDA) and polyethyleneimine (PEI) on magnetic ferroferric oxide, which can both be utilized for both heavy metal ion removal from simulated industrial wastewater and further effective catalytic reduction of toxic 4‐nitrophenol (4‐NP) to useful 4‐aminophenol. The maximum adsorption capacity of Fe3O4@PDA‐PEI for gold ions was 465.12 mg/g at 35°C, and the adsorption thermodynamic parameters ΔG, ΔH, and ΔS of Fe3O4@PDA‐PEI (m(PDA):m(PEI) = 2:1) were −5.28 (35°C), 25.58, and 111.30 J K−1 mol−1, respectively. In addition, a sustainable strategy of converting gold ions to gold nanoparticles has been demonstrated for additional catalytic functionality of Fe3O4@PDA‐PEI, and Fe3O4@PDA‐PEI‐Au could effectively catalyze the reduction of 4‐NP at ambient temperature within 9 min. Fe3O4@PDA‐PEI with the advantages of facile fabrication, easy separation, excellent adsorption, and catalysis performance could be used as a promising polymer composite material in complicated wastewater environment. © 2023 Wiley Periodicals LLC.

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Lattice oxygen-mediated Ni O O M formation for efficient oxygen evolution reaction in MOF@LDH core–shell structures

Cited by 26 publications

References 56 publications

In Situ Reconstructed Layered Double Hydroxides via MOF Engineering and Ru Doping for Decoupled Acidic Water Oxidation Enhancement

In Situ Reconstructed Layered Double Hydroxides via MOF Engineering and Ru Doping for Decoupled Acidic Water Oxidation Enhancement

Ni Doped Co-MOF-74 Synergized with 2D Ti3C2Tx MXene as an Efficient Electrocatalyst for Overall Water-Splitting

Facile fabrication of highly efficient bifunctional polydopamine–polyethyleneimine copolymerization‐modified magnetic material and its effective applications for both adsorption of gold ions and catalytic reduction of 4‐nitrophenol

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