Why do Single‐Atom Alloys Catalysts Outperform both Single‐Atom Catalysts and Nanocatalysts on MXene?

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 63(4)

Published: Dec. 1, 2023

Abstract Single‐atom alloys (SAAs), combining the advantages of single‐atom and nanoparticles (NPs), play an extremely significant role in field heterogeneous catalysis. Nevertheless, understanding catalytic mechanism SAAs catalysis reactions remains a challenge compared with single atoms NPs. Herein, ruthenium‐nickel (RuNi ) synthesized by embedding atomically dispersed Ru Ni NPs are anchored on two‐dimensional Ti 3 C 2 T x MXene. The RuNi SAA‐3 −Ti catalysts exhibit unprecedented activity for hydrogen evolution from ammonia borane (AB, NH BH hydrolysis mass‐specific (r mass value 333 L min −1 g . Theoretical calculations reveal that anchoring optimizes dissociation AB H O as well binding ability H* intermediates during due to d‐band structural modulation caused alloying effect metal‐supports interactions (MSI) This work provides useful design principles developing optimizing efficient hydrogen‐related demonstrates over energy

Language: Английский

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Epoxy‐rich Fe Single Atom Sites Boost Oxygen Reduction Electrocatalysis

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(36)

Published: July 15, 2023

Electrocatalysts for highly efficient oxygen reduction reaction (ORR) are crucial energy conversion and storage devices. Single-atom catalysts with maximized metal utilization altered electronic structure the most promising alternatives to replace current benchmark precious metals. However, atomic level understanding of functional role each species at anchoring sites is still unclear poorly elucidated. Herein, we report Fe single atom sulfur groups near atomically dispersed centers (Fe1/NSOC) ORR. The Fe1/NSOC delivers a half-wave potential 0.92 V vs. RHE, which much better than those commercial Pt/C (0.88 V), atoms on N-doped carbon (Fe1/NC, 0.89 V) reported nonprecious catalysts. spectroscopic measurements reveal that presence group induces formation epoxy FeN4S2 centers, not only modulate but also participate catalytic process improve kinetics. density theory calculations demonstrate existence engineer charges reactive center facilitate reductive release OH* (rate-limiting step), thus boosting overall efficiency.

Language: Английский

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Electrochemical Carbon Dioxide Reduction to Ethylene: From Mechanistic Understanding to Catalyst Surface Engineering

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: July 11, 2023

Electrochemical carbon dioxide reduction reaction (CO2RR) provides a promising way to convert CO2 chemicals. The multicarbon (C2+) products, especially ethylene, are of great interest due their versatile industrial applications. However, selectively reducing ethylene is still challenging as the additional energy required for C-C coupling step results in large overpotential and many competing products. Nonetheless, mechanistic understanding key steps preferred pathways/conditions, well rational design novel catalysts production have been regarded approaches achieving highly efficient selective CO2RR. In this review, we first illustrate CO2RR (e.g., adsorption/activation, formation *CO intermediate, step), offering conversion ethylene. Then alternative pathways conditions competitive products (C1 other C2+ products) investigated, guiding further development generation. Engineering strategies Cu-based CO2RR-ethylene summarized, correlations mechanism/pathways, engineering selectivity elaborated. Finally, major challenges perspectives research area proposed future practical

Language: Английский

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Engineering organic polymers as emerging sustainable materials for powerful electrocatalysts

Chemical Society Reviews, Journal Year: 2024, Volume and Issue: 53(3), P. 1447 - 1494

Published: Jan. 1, 2024

A comprehensive overview on organic polymers as electrocatalysts is summarized. By presenting the engineering strategies, insightful understandings, challenges, and perspectives, we hope this review can provide valuable references for readers.

Language: Английский

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Phosphorus-doped Ti₃C₂T_x MXene nanosheets enabling ambient NH₃ synthesis with high current densities

Chemical Communications, Journal Year: 2024, Volume and Issue: 60(66), P. 8728 - 8731

Published: Jan. 1, 2024

Herein, we show that P-doped Ti

Language: Английский

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Multifunctional microwave absorption materials: construction strategies and functional applications

Materials Horizons, Journal Year: 2024, Volume and Issue: 11(23), P. 5874 - 5894

Published: Jan. 1, 2024

Classification and multifunctional scalability of advanced microwave absorbing materials.

Language: Английский

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Electrochemical coupling in subnanometer pores/channels for rechargeable batteries

Chemical Society Reviews, Journal Year: 2024, Volume and Issue: 53(8), P. 3829 - 3895

Published: Jan. 1, 2024

This review categorizes subnanometer pores/channels (SNPCs) from structural perspective and demonstrates electrochemical couplings in SNPCs for batteries while proposing corresponding challenges future research directions.

Language: Английский

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Recent Advances in MXene-Based Electrochemical Sensors

Biosensors, Journal Year: 2025, Volume and Issue: 15(2), P. 107 - 107

Published: Feb. 13, 2025

MXene is a new family of two-dimensional nanomaterials with outstanding electrical conductivity, tunable structure, biocompatibility, and large surface area. Thanks to these unique physicochemical properties, has been used for constructing electrochemical sensors (MECSens) excellent performance. In particular, the abundant termination can contribute greatly enhancing analytical sensitivity selectivity MECSens. Recently, MECSens have widely applied in many fields including clinical diagnosis, infectious disease surveillance, food security. However, not all materials are suitable building sensors. this article, we present an overview different that developed so far. We begin short summary preparation characterization Subsequently, performance, detection strategies, application scenarios classified briefly discussed. The article ends conclusion future perspectives. hope will be helpful designing activity analysis.

Language: Английский

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The Marriage of Hydrazone‐Linked Covalent Organic Frameworks and MXene Enables Efficient Electrocatalytic Hydrogen Evolution

Small Structures, Journal Year: 2023, Volume and Issue: 5(1)

Published: Sept. 26, 2023

Electrochemical water splitting is long regarded as a green and feasible pathway to realize the scalable hydrogen production, while overall evolution reaction (HER) efficiency largely dependent on electrocatalytic ability of cathode catalysts. Herein, in situ growth hydrazone‐linked covalent organic framework (COF‐42) nanocrystals with unique nanoflower‐shaped morphology 2D ultrathin Ti 3 C 2 T x MXene nanosheets (COF/Ti ) achieved through convenient robust stereoassembly strategy. Strikingly, marriage COF‐42 not only offers multiscale porous channels for fast transportation electrolyte electrons, but also enables full exposure activation numerous catalytically active centers. As consequence, optimized COF/Ti nanoarchitecture displays exceptional HER properties terms very low onset potential 19 mV, small Tafel slope 50 mV dec −1 well reliable long‐term durability, which are comparable those commercial Pt/C catalyst. Density functional theory calculations further disclose that rational combination provides more diversified positions appropriate Δ G H values, thus leading boosted generation rate.

Language: Английский

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Advances and insights in amorphous electrocatalyst towards water splitting

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION), Journal Year: 2023, Volume and Issue: 51, P. 5 - 48

Published: Aug. 1, 2023

Language: Английский

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