Cr-Substituted SrCoO_3-δ Perovskite with Abundant Oxygen Vacancies for High-Energy and Durable Low-Temperature Antifreezing Flexible Supercapacitor

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(29), P. 13755 - 13765

Published: July 10, 2024

Developing high-performance electrodes for flexible antifreezing energy storage devices has been a significant challenge with the increasing demand portable components. In this work, Cr-substituted SrCoO

Language: Английский

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Recent advances and future challenges in the catalytic combustion of light hydrocarbon VOCs

Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: 12(13), P. 7470 - 7507

Published: Jan. 1, 2024

Various types of catalysts for the catalytic combustion light hydrocarbon VOCs and their superiority deficiency are described in detail. Meanwhile, reaction mechanisms structure–activity relationships illustrated intensively.

Language: Английский

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Enhancing Oxygen Activation Ability by Composite Interface Construction over a 2D Co₃O₄-Based Monolithic Catalyst for Toluene Oxidation

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(33), P. 14906 - 14917

Published: Aug. 6, 2024

Developing robust metal-based monolithic catalysts with efficient oxygen activation capacity is crucial for thermal catalytic treatment of volatile organic compound (VOC) pollution. Two-dimensional (2D) metal oxides are alternative catalysts, but their traditional loading strategies on carriers still face challenges in practical applications. Herein, we propose a novel situ molten salt-loading strategy that synchronously enables the construction 2D Co

Language: Английский

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Oxygen vacancy engineering through equivalent and aliovalent doping on LaCoO3

Separation and Purification Technology, Journal Year: 2024, Volume and Issue: 351, P. 128078 - 128078

Published: May 23, 2024

Language: Английский

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Constructing Robust and Efficient Ceramic Cells Air Electrodes Through Collaborative Optimization Bulk and Surface Phases

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 5, 2025

Abstract Slow reaction kinetics of air electrodes is a common problem faced by low‐temperature (<650 °C) oxygen‐ion conducting solid oxide fuel cells (O‐SOFCs) and proton‐conducting reversible proton ceramic (R‐PCCs). Here, an innovative approach proposed to design prepare two efficient durable Ba 0.5 Sr Co 0.8 Fe 0.2 O 3−δ (BSCF)‐based nanocomposites through self‐reconstruction strategy, which aim optimize both the bulk surface properties electrode materials simultaneously. Specifically, with nominal composition 0.4 Cs 0.1 0.7 M (M═Ni, Zr) consisted major perovskite phase surface‐enriched NiO BaZrO 3 minor phases. When Ni (BSCsCFNi) used as in O‐SOFCs, peak power density 1.36 W cm −2 at 650 °C; while Zr (BSCsCFZr) R‐PCCs, 1.24 current −1.98 A (1.3 V) are achieved °C, exhibits stable reversibility over 100 h. Theoretical calculations experiments indicate that + doping enhances conduction oxygen ions protons; nanoparticles enhance adsorption exchange; increase steam hydration capacity. This study provides new idea for designing cells.

Language: Английский

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Oxygen Defect Engineering of Hexagonal Perovskite Oxides to Boost Catalytic Performance for Aerobic Oxidation of Sulfides to Sulfones

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 3, 2025

Abstract Oxygen defect engineering in metal oxides is a promising approach to designing efficient active sites for catalytic oxidation involving surface lattice oxygen. In the present study, combined focusing on structure of oxygen (face‐shared vs corner‐shared) and B ‐site substitution an AB O 3 hexagonal perovskite oxide investigated. Ru‐substituted SrMnO nanoparticles (SrMn 1− x Ru ) efficiently catalyzes aerobic thioanisole sulfone with high selectivity (>99%) even at 30 °C, which much lower than temperatures required same reaction catalyzed using previously reported Mn‐ Ru‐based catalysts (80–150 °C). Only small amount incorporation ( = 0.01) substantially enhances its performance. The catalyst can be reused five times applied various sulfides afford corresponding sulfones. Mechanistic studies reveal bifunctional property SrMn , where involved sulfide oxidation, strong adsorption sulfoxides onto surfaces contributes rapid successive sulfoxide. Catalyst reducibility estimations density functional theory calculations indicate that intrinsic role likely enhance transferability face‐shared Mn 4+ –O–Mn species.

Language: Английский

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Activation of Lattice Oxygen in Ceria by Plasma Exsolution of MoO_x with Atomic Dispersion for NO_x Abatement

ACS Catalysis, Journal Year: 2024, Volume and Issue: 14(7), P. 5236 - 5246

Published: March 22, 2024

The rational control of lattice oxygen activity at the metal oxide surface remains a great challenge. Herein, an O2 plasma-assisted method was implemented to enable activation by exsolution Mo from ceria external with atomic dispersion. obtained surface-loaded MoOx/CeO2 exhibited superior turnover frequency 1.33 × 10–3 s–1 200 °C for NOx abatement, far beyond commercially available or reported NH3-SCR catalysts. mechanism study revealed that SCR reaction followed Mars–van Krevelen pathway dehydroxylation (release oxygen) as rate-determining step. hybridization 4dx2–y2 and O 2p orbitals gave rise unique 5-coordinated site facilitated interfacial Mo–O–Ce dehydration subsequent nucleophilic filling, which accounted its higher activity. This work highlights potential plasma treatment promote reactivity ceria-supported atomically dispersed catalysts provides valuable insights into intrinsic understanding enhancement.

Language: Английский

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Boosting oxygen/hydrogen evolution catalysis via ruthenium doping in perovskite oxide for efficient alkaline water splitting

Applied Surface Science, Journal Year: 2024, Volume and Issue: 664, P. 160278 - 160278

Published: May 13, 2024

Language: Английский

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Amorphous Fe_0.7Cu_0.3O_x as a Bifunctional Catalyst for Selective Hydration of Nitriles to Amides in Water

ACS Sustainable Chemistry & Engineering, Journal Year: 2024, Volume and Issue: 12(20), P. 7791 - 7801

Published: May 3, 2024

The development of sustainable and economical catalytic systems for the hydration nitriles into amides is great industrial significance. In this work, amorphous Fe0.7Cu0.3Ox-300, synthesized by a simple melting method, presented high activity nitrile in water, without any additives. Characterization mechanism experiments indicated that surface oxygen Fe0.7Cu0.3Ox-300 acts as Brønsted base sites, enhancing dissociation H2O. Fe–Cu interaction within catalyst facilitates formation active Fe species with higher valence states, serving Lewis acidic sites molecule adsorption activation. Notably, achieved efficient synthesis various aromatic, aliphatic, heteroaromatic yields (20 products), also showcasing good scalability stability. Moreover, limited solubility most water further simplifies process, allowing simultaneous purification. This study manifests potential large-scale applications amide synthesis, aligned principles chemistry.

Language: Английский

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Investigating the role of oxygen vacancies in metal oxide for enhanced electrochemical reduction of NO₃⁻ to NH₃: mechanistic insights

Inorganic Chemistry Frontiers, Journal Year: 2023, Volume and Issue: 10(22), P. 6440 - 6488

Published: Jan. 1, 2023

Ammonia (NH 3 ) is a crucial chemical commodity used extensively in fertilizer production and as renewable potential energy carrier.

Language: Английский

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