Lignin-based support for metal catalysts: Synthetic strategies, performance boost, and application advances

Coordination Chemistry Reviews, Journal Year: 2025, Volume and Issue: 528, P. 216426 - 216426

Published: Jan. 10, 2025

Language: Английский

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Destabilization of Single‐Atom Catalysts: Characterization, Mechanisms, and Regeneration Strategies

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

Published: Jan. 19, 2025

Abstract Numerous in situ characterization studies have focused on revealing the catalytic mechanisms of single‐atom catalysts (SACs), providing a theoretical basis for their rational design. Although research is relatively limited, stability SACs under long‐term operating conditions equally important and prerequisite real‐world energy applications, such as fuel cells water electrolyzers. Recently, there has been rise destabilization regeneration SACs; however, timely comprehensive summaries that provide catalysis community with valuable insights directions are still lacking. This review summarizes recent advances strategies SACs, specifically highlighting various state‐of‐the‐art techniques employed studies. The factors induce identified by discussing failure active sites, coordination environments, supports, reaction scenarios. Next, primary introduced, including redispersion, surface poison desorption, exposure subsurface sites. Additionally, advantages limitations both ex discussed. Finally, future proposed, aimed at constructing structure–stability relationships guiding design more stable SACs.

Language: Английский

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The Single Atom Anchoring Strategy: Rational Design of MXene‐Based Single‐Atom Catalysts for Electrocatalysis

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 13, 2025

Abstract Single‐atom catalysts (SACs) are a class of with low dosage, cost, and the presence metal atom‐carrier interactions high catalytic activity, which considered to possess significant potential in field electrocatalysis. The most important aspect synthesis SACs is selection suitable carriers. Metal carbides, nitrides, or carbon‐nitrides (MXenes) widely used as new type 2D materials good electrical conductivity tunable surface properties. abundance functional groups vacancy defects on MXenes an ideal anchoring site for single atoms therefore regarded carrier single‐atom loading. In this work, preparation method MXenes, loading mode SACs, characterization catalysts, electrochemical performance described detail, some hot issues current research future directions also summarized. aim work promote development MXene‐based within realm With ongoing innovation, these expected be crucial energy conversion storage solutions.

Language: Английский

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Precise synthesis of dual atom sites for electrocatalysis

Nano Research, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 17, 2024

Language: Английский

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Surface Phosphorus Grafting of Ti₃C₂T_x MXene as an Interface Charge “Bridge” for Efficient Electrocatalytic Hydrogen Evolution in All-pH Media

Chemistry of Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 4, 2024

The interface electronic structure of heterogeneous catalysts can be modulated by changing the surface coordination configuration, which is crucial to their catalytic activity. Herein, a phosphorus-grafted Ti3C2Tx MXene platform anchored with an MoS2 nanoflake heterojunction electrocatalyst was assembled through simple phosphorus-hydrothermal method. An charge "bridge" has been created grafting uniform P atoms coordinated O (P-Ti3C2Tx), resulting in charge-transfer channel between P-Ti3C2Tx and MoS2. Based on ultrafast transient absorption spectroscopy, fastest electron-transfer kinetics from (1.7 ps) slowest electron–hole recombination speed (28 were obtained over MoS2@P-Ti3C2Tx than those MoS2@O-Ti3C2Tx MoS2@OP-Ti3C2Tx. Benefiting lower carrier transport activation energy, exhibited stirring electrocatalytic activity toward hydrogen evolution all-pH media, delivered three low overpotentials 48.6, 63.2, 70.5 mV at 10 mA cm–2 alkaline, acid, neutral respectively. Grafting atomic scale create proposes new strategy design efficient pH-universal electrocatalyst.

Language: Английский

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Nickel-promoted ruthenium nanocatalysts for controllable hydrogen production from NH3BH3 hydrolysis

Applied Surface Science, Journal Year: 2025, Volume and Issue: unknown, P. 162345 - 162345

Published: Jan. 1, 2025

Language: Английский

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Electron-enriched Rh sites constructed by TiOx with rich B-N motifs and oxygen vacancies for enhanced hydrogen generation from ammonia borane hydrolysis

Fuel, Journal Year: 2025, Volume and Issue: 387, P. 134345 - 134345

Published: Jan. 13, 2025

Language: Английский

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Isolated Metal Centers Activate Small Molecule Electrooxidation: Mechanisms and Applications

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

Published: Jan. 26, 2025

Abstract Electrochemical oxidation of small molecules shows great promise to substitute oxygen evolution reaction (OER) or hydrogen (HOR) enhance kinetics and reduce energy consumption, as well produce high‐valued chemicals serve fuels. For these reactions, high‐valence metal sites generated at oxidative potentials are typically considered active trigger the process molecules. Isolated atom site catalysts (IASCs) have been developed an ideal system precisely regulate state coordination environment single‐metal centers, thus optimize their catalytic property. The isolated in IASCs inherently possess a positive state, can be more readily homogeneous under than nanoparticle counterparts. Meanwhile, merely centers but lack ensemble sites, which alter adsorption configurations compared with counterparts, induce various pathways mechanisms change product selectivity. More importantly, construction is discovered limit d‐electron back donation CO 2p * orbital overly strong on resolve poisoning problems most electro‐oxidation reactions improve stability. Based advantages fields electrochemical molecules, this review summarizes recent developments advancements focusing anodic HOR fuel cells OER electrolytic alternative such formic acid/methanol/ethanol/glycerol/urea/5‐hydroxymethylfurfural (HMF) key reactions. merits different decoding structure–activity relationships specifically discussed guide precise design structural regulation from perspective comprehensive mechanism. Finally, future prospects challenges put forward, aiming motivate application possibilities for diverse functional IASCs.

Language: Английский

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Engineering the Lewis Acidity of Fe Single-Atom Sites via Atomic-Level Tuning of Spatial Coordination Configuration for Enhanced Oxygen Reduction

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 16, 2025

Nitrogen-doped carbon-supported Fe catalysts (Fe-N-C) with Fe-N4 active sites hold great promise for the oxygen reduction reaction (ORR). However, fine-tuning structure of to enhance their performance remains a grand challenge. Herein, we report an innovative design strategy promote ORR activity and kinetics by engineering Lewis acidity, which is achieved tuning spatial coordination geometry. Theoretical calculations indicated that Fe1-N4SO2 (with axial –SO2 group bonded Fe) offered favorable acidity ORR, leading optimized adsorption energies key intermediates. To implement this strategy, developed molecular-cage-encapsulated synthesize single-atom site catalyst (SAC) sites. In agreement theory, Fe1-N4SO2/NC demonstrated outstanding in both alkaline (E1/2 = 0.910 V 0.1 M KOH) acidic media 0.772 HClO4), surpassing commercial Pt/C traditional SACs Fe1-N4 or planar S-coordinated Fe1-N4-S Moreover, newly showed application potential quasi-solid-state Zn–air batteries, delivering superior across wide temperature range.

Language: Английский

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Geminal Synergy in Pt–Co Dual-Atom Catalysts: From Synthesis to Photocatalytic Hydrogen Production

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 21, 2024

Dual-atom catalysts (DACs) have garnered significant interest due to their high atom utilization and synergistic catalysis. However, developing a precise synthetic method for DACs comprehending the underlying catalytic mechanisms remain challenging. In this study, we employ photoinduced anchoring strategy precisely synthesize PtCo DAC on graphitic carbon nitride (CN). A Co was anchored CN through lone-pair electrons of nitrogen. Upon light irradiation, photoelectrons gathering at site can anchor Pt metal ions nearby, accurately facilitating formation heteronuclear DACs. The demonstrates remarkably H2 generation rate from ammonia borane (AB) hydrolysis, with TOF 3130 molH2 molPt–1 min–1 298 K. This value is approximately 3.2 times higher than that single-atom photocatalyst. Importantly, shows good stability, achieving turnover number as 307,982 room temperature. experimental theoretical calculation results demonstrate synergy between optimizes adsorption energy AB molecules while reducing barrier rate-determining step, thus accelerating evolution hydrolysis. Additionally, introduced species stabilize active sites by enhancing stability Pt–N bond, preventing leaching, aggregation, deactivation. excellent performance, low cost in work open new prospects practical application hydrogen production.

Language: Английский

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