Nitrogen‐doped microporous graphite‐enhanced copper plasmonic effect for solar evaporation

Carbon Energy, Journal Year: 2024, Volume and Issue: 6(3)

Published: Jan. 30, 2024

Abstract Water scarcity is a global challenge, and solar evaporation technology offers promising eco‐friendly solution for freshwater production. Photothermal conversion materials (PCMs) are crucial evaporation. Improving photothermal efficiency reducing water enthalpy the two key strategies designing of PCMs. The desired PCMs that combine both these properties remain challenging task, even with latest advancements in field. Herein, we developed copper nanoparticles (NPs) different conjugated nitrogen‐doped microporous carbon coatings (Cu@C–N) as enveloping layer provides highly efficient pathway transport nanoconfined environment protects Cu NPs facilitates clusters, Meanwhile, nitrogen nodes form strong metal‐organic coordination bonds surface NPs, acting an energy bridge to achieve rapid transfer provide high solar‐to‐vapor efficiency. Cu@C–N exhibited up 89.4% rate 1.94 kg m −2 h −1 under one sun irradiation, outperforming conventional PCMs, including carbon‐based semiconductor materials. These findings offer design scheme high‐performance essential evaporators address scarcity.

Language: Английский

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Low-loaded Ru on hollow SnO₂ for enhanced electrocatalytic hydrogen evolution

Chemical Communications, Journal Year: 2024, Volume and Issue: 60(20), P. 2768 - 2771

Published: Jan. 1, 2024

Ru–SnO 2 with low Ru loading and a hollow structure is developed as high-performance electrocatalyst for the hydrogen evolution reaction.

Language: Английский

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Confined cobalt single‐atom catalysts with strong electronic metal‐support interactions based on a biomimetic self‐assembly strategy

Carbon Energy, Journal Year: 2024, Volume and Issue: 6(9)

Published: April 17, 2024

Abstract Designing high‐performance and low‐cost electrocatalysts for oxygen evolution reaction (OER) is critical the conversion storage of sustainable energy technologies. Inspired by biomineralization process, we utilized phosphorylation sites collagen molecules to combine with cobalt‐based mononuclear precursors at molecular level built a three‐dimensional (3D) porous hierarchical material through bottom‐up biomimetic self‐assembly strategy obtain single‐atom catalysts confined on carbonized self‐assembled carriers (Co SACs/cBSC) after subsequent high‐temperature annealing. In this strategy, biomolecule improved anchoring efficiency metal precursor precise functional groups; meanwhile, binding‐then‐assembling also effectively suppressed nonspecific adsorption ions, ultimately preventing atomic agglomeration achieving strong electronic metal‐support interactions (EMSIs). Experimental characterizations confirm that binding forms between cobalt substrate (Co–O 4 –P). Theoretical calculations disclose local environment changes significantly tailored Co d‐band center, optimized oxygenated intermediates barrier release. As result, obtained SACs/cBSC catalyst can achieve remarkable OER activity 24 h durability in 1 M KOH ( η 10 288 mV; Tafel slope 44 mV dec −1 ), better than other transition metal‐based commercial IrO 2 . Overall, presented prepare SACs EMSIs, providing new avenue preparation efficient fine structures.

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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Understanding the Bifunctional Trends of Fe‐Based Binary Single‐Atom Catalysts

Advanced Science, Journal Year: 2023, Volume and Issue: 10(24)

Published: June 21, 2023

Binary single-atom catalysts (BSACs) have demonstrated fascinating activities compared to single atom (SACs) for oxygen reduction reaction (ORR) and evolution (OER). Notably, Fe SACs is one of the most promising ORR electrocatalysts, further revealing synergistic effects between other 3d transition metals (M) FeM BSACs are very important enhance bifunctional performance. Herein, density functional theory (DFT) calculations first adapted demonstrate role various on activity sites, a notable volcano relationship established through generally accepted adsorption free energy that ΔG

Language: Английский

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Multimetallic Single-Atom Catalysts for Bifunctional Oxygen Electrocatalysis

ACS Nano, Journal Year: 2023, Volume and Issue: 17(18), P. 18128 - 18138

Published: Sept. 10, 2023

Multimetallic alloys have demonstrated promising performance for the application of metal-air batteries, while it remains a challenge to design multimetallic single-atom catalysts (MM-SACs). Herein, metal-C3N4 and nitrogen-doped carbon are employed as cornerstones synthesize MM-SACs by general two-step method, inherent features atomic dispersion strong electronic reciprocity between sites been verified. The trimetallic FeCoZn-SACs quatermetallic FeCoCuZn-SACs both found deliver superior oxygen evolution reaction reduction activity, respectively, well outstanding bifunctional durability. Density functional theory calculations elucidate crucial contribution Co efficient catalysis ORR OER. More importantly, Zn-air batteries with cathodic exhibit high power density (252 mW cm-2), specific capacity (817 mAh gZn-1), considerable stability (over 225 h) charging-discharging processes. This work provides visual perspective advantages toward electrocatalysis.

Language: Английский

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Toward highly accessible Fe-N4 sites via rational design of metal chelated ionic liquids for ORR, OER and HER trifunctional electrocatalysis

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 489, P. 151235 - 151235

Published: April 16, 2024

Language: Английский

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Achieving Negatively Charged Pt Single Atoms on Amorphous Ni(OH)2 Nanosheets with Promoted Hydrogen Absorption in Hydrogen Evolution

Nano-Micro Letters, Journal Year: 2024, Volume and Issue: 16(1)

Published: May 23, 2024

Single-atom (SA) catalysts with nearly 100% atom utilization have been widely employed in electrolysis for decades, due to the outperforming catalytic activity and selectivity. However, most of reported SA are fixed through strong bonding between dispersed single metallic atoms nonmetallic substrates, which greatly limits controllable regulation electrocatalytic catalysts. In this work, Pt-Ni bonded Pt catalyst adjustable electronic states was successfully constructed a electrochemical reduction on coordination unsaturated amorphous Ni(OH)

Language: Английский

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Understanding the Dynamic Evolution of Active Sites among Single Atoms, Clusters, and Nanoparticles

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

Published: Jan. 2, 2025

Abstract Catalysis remains a cornerstone of chemical research, with the active sites catalysts being crucial for their functionality. Identifying sites, particularly during reaction process, is elucidating relationship between catalyst's structure and its catalytic property. However, dynamic evolution within heterogeneous metal presents substantial challenge accurately pinpointing real sites. The advent in situ operando characterization techniques has illuminated path toward understanding changes offering robust scientific evidence to support rational design catalysts. There pressing need comprehensive review that systematically explores among single atoms, clusters, nanoparticles as utilizing techniques. This aims delineate effects various factors on nanoparticles. Moreover, several are elaborated emphases tracking linking them properties. Finally, it discusses challenges future perspectives identifying process advancing

Language: Английский

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N, P co-doped NiMoOx three-dimensional nanoflower cluster-structured bifunctional electrocatalyst for efficient overall water splitting

Journal of Alloys and Compounds, Journal Year: 2025, Volume and Issue: unknown, P. 178510 - 178510

Published: Jan. 1, 2025

Language: Английский

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