High‐entropy alloy stabilized and activated Pt clusters for highly efficient electrocatalysis

SusMat, Journal Year: 2022, Volume and Issue: 2(2), P. 186 - 196

Published: March 23, 2022

Abstract Although Pt and other noble metals are the state‐of‐the‐art catalysts for various energy conversion applications, their low reserve, high cost, instability limit large‐scale utilization. Herein, we report a hybrid design featuring metal clusters (e.g., Pt) uniformly dispersed stabilized on high‐entropy alloy nanoparticles (HEA, e.g., FeCoNiCu), denoted as HEA@Pt, which is prepared via ultra‐fast shock synthesis (∼300 ms) HEA alloying combined with galvanic replacement surface anchoring. In our design, core critically ensures dispersity, stability, tunability of through entropy stabilization core‐shell interactions. As an example in hydrogen evolution reaction, HEA@Pt achieved significant mass activity 235 A/g , 9.4, 3.6, 1.9‐times higher compared to that homogeneous FeCoNiCuPt (HEA‐Pt), Pt, commercial Pt/C, respectively. We also demonstrated Ir FeCoNiCrMn (HEA‐5@Ir), achieving excellent anodic oxygen performance highly efficient overall water splitting when cathodic HEA@Pt. Therefore, work developed general strategies by using effective dispersion, stabilization, modulation active sites, harmonious combination activity, cost.

Language: Английский

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Unravelling Composition–Activity–Stability Trends in High Entropy Alloy Electrocatalysts by Using a Data‐Guided Combinatorial Synthesis Strategy and Computational Modeling

Advanced Energy Materials, Journal Year: 2022, Volume and Issue: 12(8)

Published: Jan. 5, 2022

Abstract High entropy alloys (HEA) comprise a huge search space for new electrocatalysts. Next to element combinations, the optimization of chemical composition is essential tuning HEA specific catalytic processes. Simulations electrocatalytic activity can guide experimental efforts. Yet, currently available underlying model assumptions do not necessarily align with evidence. To study deviations theoretical models and data requires statistically relevant datasets. Here, combinatorial strategy acquiring large datasets multi‐dimensional spaces presented. Ru–Rh–Pd–Ir–Pt studied as an exemplary, highly system. Systematic comparison computed electrochemical enables from compositionally complex solid solutions in experiment. The results suggest that experimentally obtained distribution surface atoms deviates ideal model. Leveraging both advanced simulation estimation solid‐solution stability trends 5D A perspective on future directions development active stable catalysts outlined.

Language: Английский

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Recent experimental and theoretical advances in the design and science of high-entropy alloy nanoparticles

Nano Energy, Journal Year: 2023, Volume and Issue: 110, P. 108362 - 108362

Published: March 20, 2023

Language: Английский

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Transient and general synthesis of high-density and ultrasmall nanoparticles on two-dimensional porous carbon via coordinated carbothermal shock

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: April 21, 2023

Abstract Carbon-supported nanoparticles are indispensable to enabling new energy technologies such as metal-air batteries and catalytic water splitting. However, achieving ultrasmall high-density (optimal catalysts) faces fundamental challenges of their strong tendency toward coarsening agglomeration. Herein, we report a general efficient synthesis uniformly dispersed on two-dimensional porous carbon. This is achieved through direct carbothermal shock pyrolysis metal-ligand precursors in just ~100 ms, the fastest among reported syntheses. Our results show that situ coordination (e.g., N → Co 2+ ) local ordering during millisecond-scale play crucial role kinetically dominated fabrication stabilization carbon films. The as-obtained samples exhibit excellent activity stability bifunctional catalysts oxygen redox reactions. Considering huge flexibility coordinated design, diversified single multielement (M = Fe, Co, Ni, Cu, Cr, Mn, Ag, etc) were generally fabricated, even systems well beyond traditional crystalline chemistry. method allows for transient well-dispersed with great simplicity versatility various application schemes.

Language: Английский

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Emerging Atomically Precise Metal Nanoclusters and Ultrasmall Nanoparticles for Efficient Electrochemical Energy Catalysis: Synthesis Strategies and Surface/Interface Engineering

Electrochemical Energy Reviews, Journal Year: 2024, Volume and Issue: 7(1)

Published: March 9, 2024

Language: Английский

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