P and Cu Dual Sites on Graphitic Carbon Nitride for Photocatalytic CO₂Reduction to Hydrocarbon Fuels with High C₂H₆Evolution

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(40)

Published: Aug. 15, 2022

The light-driven CO2 reduction to multi-carbon products is especially meaningful, while the low efficiency of multi-electron transfer and sluggish C-C coupling greatly hinder its development. Herein, we report a photocatalyst comprising P Cu dual sites anchored on graphitic carbon nitride (P/Cu SAs@CN), which achieves high C2 H6 evolution rate 616.6 μmol g-1 h-1 in reducing hydrocarbons. detailed spectroscopic characterizations identify formation charge-enriched sites, where isolated atoms serve as hole capture during photocatalysis. Theoretical simulations combined with situ FTIR measurement reveal kinetically feasible process for intermediate (*OC-COH) confirm favorable production P/Cu SAs@CN photocatalyst. This work offers new insights into design atomic precision toward highly efficient photocatalytic conversion value-added products.

Language: Английский

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Long‐Range Interactions in Diatomic Catalysts Boosting Electrocatalysis

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(52)

Published: Oct. 6, 2022

Abstract The simultaneous presence of two active metal centres in diatomic catalysts (DACs) leads to the occurrence specific interactions between sites. Such interactions, referred as long‐range (LRIs), play an important role determining rate and selectivity a reaction. optimal combination must be determined achieve targeted efficiency. To date, various types DACs have been synthesised applied electrochemistry. However, LRIs not systematically summarised. Herein, regulation, mechanism, electrocatalytic applications are comprehensively summarised discussed. In addition basic information above, challenges, opportunities, future development proposed order present overall view reference for research.

Language: Английский

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Atomically dispersed materials: Ideal catalysts in atomic era

Nano Research, Journal Year: 2023, Volume and Issue: 17(1), P. 18 - 38

Published: May 25, 2023

Language: Английский

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Synergistic Fe−Se Atom Pairs as Bifunctional Oxygen Electrocatalysts Boost Low‐Temperature Rechargeable Zn‐Air Battery

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(15)

Published: Feb. 18, 2023

Herein, we successfully construct bifunctional electrocatalysts by synthesizing atomically dispersed Fe-Se atom pairs supported on N-doped carbon (Fe-Se/NC). The obtained Fe-Se/NC shows a noteworthy oxygen catalytic performance with low potential difference of 0.698 V, far superior to that reported Fe-based single-atom catalysts. theoretical calculations reveal p-d orbital hybridization around the leads remarkably asymmetrical polarized charge distributions. based solid-state rechargeable Zn-air batteries (ZABs-Fe-Se/NC) present stable charge/discharge 200 h (1090 cycles) at 20 mA cm-2 25 °C, which is 6.9 times ZABs-Pt/C+Ir/C. At extremely temperature -40 ZABs-Fe-Se/NC displays an ultra-robust cycling 741 (4041 1 , about 11.7 More importantly, could be operated for 133 (725 even 5 °C.

Language: Английский

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Dual‐Atom Support Boosts Nickel‐Catalyzed Urea Electrooxidation

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(22)

Published: March 24, 2023

Nickel-based catalysts have been regarded as one of the most promising electrocatalysts for urea oxidation reaction (UOR), however, their activity is largely limited by inevitable self-oxidation Ni species (NSOR) during UOR. Here, we proposed an interface chemistry modulation strategy to trigger occurrence UOR before NSOR via constructing a 2D/2D heterostructure that consists ultrathin NiO anchored Ru-Co dual-atom support (Ru-Co DAS/NiO). Operando spectroscopic characterizations confirm this unique triggering mechanism on surface DAS/NiO. Consequently, fabricated catalyst exhibits outstanding with low potential 1.288 V at 10 mA cm-2 and remarkable long-term durability more than 330 h operation. DFT calculations demonstrate favorable electronic structure induced heterointerface endows energetically NSOR.

Language: Английский

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Lattice Strain and Schottky Junction Dual Regulation Boosts Ultrafine Ruthenium Nanoparticles Anchored on a N-Modified Carbon Catalyst for H₂ Production

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(42), P. 19619 - 19626

Published: Oct. 12, 2022

Ruthenium-based materials are considered great promising candidates to replace Pt-based catalysts for hydrogen production in alkaline conditions. Herein, we adopt a facile method rationally design neoteric Schottky catalyst which uniform ultrafine ruthenium nanoparticles featuring lattice compressive stress supported on nitrogen-modified carbon nanosheets (Ru NPs/NC) efficient evolution reaction (HER). Lattice strain and junction dual regulation ensures that the Ru NPs/NC with an appropriate nitrogen content displays superb H2 media. Particularly, NPs/NC-900 1.3% attractive activity durability HER low overpotential of 19 mV at 10 mA cm-2 1.0 M KOH electrolyte. The situ X-ray absorption fine structure measurements indicate low-valence nanoparticle shrinking Ru-Ru bond acts as catalytic active site during process. Furthermore, multiple spectroscopy analysis density functional theory calculations demonstrate tunes electron adsorption center, thus enhancing activity. This strategy provides novel concept advanced electrocatalysts production.

Language: Английский

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Microenvironment Engineering of Single/Dual‐Atom Catalysts for Electrocatalytic Application

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(31)

Published: Feb. 23, 2023

Single/dual-metal atoms supported on carbon matrix can be modulated by coordination structure and neighboring active sites. Precisely designing the geometric electronic uncovering structure-property relationships of single/dual-metal confront with grand challenges. Herein, this review summarizes latest progress in microenvironment engineering single/dual-atom sites via a comprehensive comparison single-atom catalyst (SACs) dual-atom catalysts (DACs) term design principles, modulation strategy, theoretical understanding structure-performance correlations. Subsequently, recent advances several typical electrocatalysis process are discussed to get general reaction mechanisms finely-tuned SACs DACs. Finally, full-scaled summaries challenges prospects given for This will provide new inspiration development atomically dispersed electrocatalytic application.

Language: Английский

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The reformation of catalyst: From a trial-and-error synthesis to rational design

Nano Research, Journal Year: 2023, Volume and Issue: 17(4), P. 3261 - 3301

Published: Sept. 27, 2023

Language: Английский

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Carbon Nitride Photocatalysts with Integrated Oxidation and Reduction Atomic Active Centers for Improved CO₂Conversion

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(34)

Published: June 18, 2022

Single-atom active-site catalysts have attracted significant attention in the field of photocatalytic CO2 conversion. However, designing active sites for reduction and H2 O oxidation simultaneously on a photocatalyst combining corresponding half-reaction system is still difficult. Here, we synthesized bimetallic single-atom with two compatible centers Mn Co carbon nitride (Mn1 Co1 /CN). Our experimental results density functional theory calculations showed that center promotes by accumulating photogenerated holes. In addition, activation increasing bond length angle molecules. Benefiting from synergistic effect atomic centers, Mn1 /CN exhibited CO production rate 47 μmol g-1 h-1 , which significantly higher than single-metal photocatalyst.

Language: Английский

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Proximity Electronic Effect of Ni/Co Diatomic Sites for Synergistic Promotion of Electrocatalytic Oxygen Reduction and Hydrogen Evolution

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 33(4)

Published: Nov. 13, 2022

Abstract The modulation effect manifests an encouraging potential to enhance the performance of single‐atom catalysts; however, in‐depth study about this for isolated diatomic sites (DASs) remains a great challenge. Herein, proximity electronic (PEE) Ni/Co DASs is proposed that anchored in N‐doped carbon (N‐C) substrate (NiCo DASs/N‐C) synergistic promoting electrocatalytic oxygen reduction reaction (ORR) and hydrogen evolution (HER). Benefiting from PEE adjacent Ni by four nitrogen (Ni‐N 4 ) moiety, NiCo DASs/N‐C catalyst exhibits superior ORR HER activity. In situ characterization results suggest Co (Co‐N as main active site O 2 adsorption‐activation process, which promotes formation key *OOH desorption *OH intermediate accelerate multielectron kinetics. Theoretical calculation reveals Ni‐N modulator can effectively adjust localization Co‐N site, *H adsorption on thereby boosting process significantly. This opens new opportunity rationally regulating catalytic centers well provides guidance designing high‐efficiency bifunctional electrocatalysts promising applications.

Language: Английский

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