Formation and Stabilization of NiOOH by Introducing α‐FeOOH in LDH: Composite Electrocatalyst for Oxygen Evolution and Urea Oxidation Reactions

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(7)

Published: Nov. 19, 2022

NiOOH is considered as the most active intermediate during electrochemical oxidation reaction, however, it hard to directly synthesize due high energy. Herein, theoretical calculations predict that α-FeOOH enables a decline in formation energy and an improvement stabilization of NiFe-based layered double hydroxide (LDH). Inspiringly, composite composed LDH well-designed successfully fabricated hydrothermal treatment by adding extra Fe3+ resource, stable obtained following electro-oxidation method. Benefiting from strong electron-capturing capability α-FeOOH, efficiently promotes charge redistribution around Ni/Fe sites activates Ni atoms LDH, verified X-ray photoelectron spectra (XPS) absorption (XAS). The d-band center optimized balances desorption energy, thus Gibbs free barrier lowered dramatically toward oxygen evolution reaction (OER) urea (UOR), finally showing outstanding overpotential 195 mV potential 1.35 V at 10 mA cm-2 , respectively. This study provides novel strategy construct highly efficient catalysts via introduction new phase for complex multiple-electron reactions.

Language: Английский

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Key roles of surface Fe sites and Sr vacancies in the perovskite for an efficient oxygen evolution reactionvialattice oxygen oxidation

Energy & Environmental Science, Journal Year: 2022, Volume and Issue: 15(9), P. 3912 - 3922

Published: Jan. 1, 2022

Highly efficient La/Sr-based perovskites with surface Fe sites and Sr vacancies were developed for the active lattice oxygen mechanism (LOM) of evolution reaction (OER), a relationship between LOM dynamic structure was established.

Language: Английский

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A review of modulation strategies for improving catalytic performance of transition metal phosphides for oxygen evolution reaction

Applied Catalysis B Environment and Energy, Journal Year: 2022, Volume and Issue: 325, P. 122313 - 122313

Published: Dec. 21, 2022

Language: Английский

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Exceptional catalytic activity of oxygen evolution reaction via two-dimensional graphene multilayer confined metal-organic frameworks

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: Oct. 18, 2022

Oxygen evolution reaction (OER) plays a key role in many renewable energy technologies such as water splitting and metal-air batteries. Metal-organic frameworks (MOFs) are appealing to design efficient OER electrocatalysts, however, their intrinsic poor conductivity strongly hinders the activity. Here, we show strategy boost activity of poor-conductive MOFs by confining them between graphene multilayers. The resultant NiFe-MOF//G gives record-low overpotential 106 mV reach 10 mA cm-2 retains over 150 h, which is significant contrast 399 pristine NiFe-MOF. We use X-ray absorption spectroscopy (XAS) computations demonstrate that nanoconfinement from multilayers not only forms highly reactive NiO6-FeO5 distorted octahedral species MOF structure but also lowers limiting potential for oxidation reaction. applicable other different structures largely enhance electrocatalytic activities.

Language: Английский

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Recent advances in interface engineering strategy for highly‐efficient electrocatalytic water splitting

InfoMat, Journal Year: 2022, Volume and Issue: 5(1)

Published: Oct. 13, 2022

Abstract The hydrogen energy generated by the electrocatalytic water splitting reaction has been established as a renewable and clean carrier with ultra‐high density, which can well make up for shortcomings of conventional sources, such geographical limitations, climatic dependence, wastage. Notably, introduction electrocatalysts enhance efficiency process to generate hydrogen. Particularly, heterostructure constructed coupling multiple components (or phases) have emerged most promising option due well‐known electronic synergistic effects. existing reviews on interface engineering electrocatalyst design mostly focus relationship between heterostructures specific reactions. However, comprehensive overview integration model building, directional synthesis, mechanism rarely reported. To this end, in review, development catalysts is systematically introduced from perspective classification, growth regulation performance based interfacial microenvironment (bonding, configuration, lattice strain, etc.), thereby offering useful insights construction models. Besides, combined current applications strategies, challenges future are discussed relevant solutions proposed. Overall, review serve theoretical reference mechanism, further promote production technologies low consumption high yield. image

Language: Английский

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Self‐Reconstructed Metal‐Organic Framework Heterojunction for Switchable Oxygen Evolution Reaction

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(51)

Published: Oct. 24, 2022

Designing metal-organic framework (MOF)-based catalysts with superior oxygen evolution reaction (OER) activity and robust durability simultaneously is highly required yet very challenging due to the limited intrinsic their elusive under harsh OER conditions. Herein, a steady self-reconstructed MOF heterojunction constructed via redox electrochemistry topology-guided strategy. Thanks inhibiting effect from hydrogen bonds of Ni-BDC-1 (BDC=1,4-benzenedicarboxylic acid), obatained shows greatly improved low overpotential 225 mV at 10 mA cm-2 , relative totally reconstructed Ni-BDC-3 (332 mV). Density function theory calculations reveal that formed built-in electric field in remarkably optimizes ad/desorption free energy active Ni sites. Moreover, such attributed shielding surface-evolved NiOOH coating.

Language: Английский

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Modulating Local Interfacial Bonding Environment of Heterostructures for Energy‐Saving Hydrogen Production at High Current Densities

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(12)

Published: Jan. 8, 2023

Abstract Coupling urea oxidation reaction (UOR) with hydrogen evolution (HER) is an effective energy‐saving technique for generation. However, exploring efficient bifunctional electrocatalysts under high current density still challenging. Herein, hierarchical Fe doped cobalt selenide coupled FeCo layered double hydroxide (Fe‐Co 0.85 Se/FeCo LDH) array as a self‐supported superior heterojunction electrode rationally designed both UOR and HER. The unique heterostructure facilitates electron transfer interface interactions through local interfacial Co‐Se/O‐Fe bonding environment modulation, improving kinetics intrinsic activity. As result, the heterostructured electrocatalyst exhibits ultralow potentials of −0.274 1.48 V to reach 500 mA cm −2 catalyzing HER UOR, respectively. Particularly, full electrolysis system driven by Fe‐Co LDH delivers 300 at relatively low potential 1.57 V, which 150 mV lower than conventional water electrolysis. combination in situ characterization theoretical analysis reveal that active sites adjustable electronic are induced heterojunction, facilitating decomposition stabilization intermediates UOR. This work inspires modulation optimize advanced H 2 production.

Language: Английский

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Multicomponent transition metal oxides and (oxy)hydroxides for oxygen evolution

Nano Research, Journal Year: 2022, Volume and Issue: 16(2), P. 1913 - 1966

Published: Oct. 2, 2022

Language: Английский

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Optimization of oxygen evolution activity by tuning e*g band broadening in nickel oxyhydroxide

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(2), P. 641 - 652

Published: Jan. 1, 2023

In Ni(OH) 2 , a greater extent of band (3d electron states with e g symmetry) broadening can facilitate transfer from the electrocatalyst to external circuit, leading higher OER catalytic performance.

Language: Английский

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Photoinduced acceleration of Fe3+/Fe2+ cycle in heterogeneous FeNi-MOFs to boost peroxodisulfate activation for organic pollutant degradation

Applied Catalysis B Environment and Energy, Journal Year: 2022, Volume and Issue: 321, P. 122054 - 122054

Published: Oct. 8, 2022

Language: Английский

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