A5023267010- High Entropy Alloys Studies
- Advanced Materials Characterization Techniques
- Electrocatalysts for Energy Conversion
- nanoparticles nucleation surface interactions
- High-Temperature Coating Behaviors
- Catalytic Processes in Materials Science
- Laser-Ablation Synthesis of Nanoparticles
- Nanomaterials for catalytic reactions
- Copper-based nanomaterials and applications
- Nanomaterials and Printing Technologies
- Liquid Crystal Research Advancements
- Block Copolymer Self-Assembly
- Advanced Photocatalysis Techniques
- Nanocluster Synthesis and Applications
National Tsing Hua University
2022-2024
High-entropy alloy (HEA) nanocrystals have attracted extensive attention in catalysis. However, there are no effective strategies for synthesizing them a controllable and predictable manner. With quinary HEA made of platinum-group metals as an example, we demonstrate that their structures with spatial compositions can be predicted by quantitatively knowing the reduction kinetics metal precursors entropy mixing under dropwise addition five-metal precursor solution. The time to reach steady...
We report a catalyst family of high-entropy alloy (HEA) atomic layers having three elements from iron-group metals (IGMs) and two platinum-group (PGMs). Ten distinct quinary compositions IGM-PGM-HEA with precisely controlled square arrangements are used to explore their impact on hydrogen evolution reaction (HER) oxidation (HOR). The PtRuFeCoNi perform enhanced catalytic activity durability toward HER HOR when benchmarked against the other commercial Pt/C catalysts. Operando synchrotron...
Abstract Shifting from the typical 4e – pathway to H 2 O in electrochemical oxygen reduction 2e is increasingly recognized as an environmentally friendly approach for producing . However, competitive − a significant obstacle production of since thermodynamically favored product. Here, series Pt, Pd, and Rh active atoms diluted within inert‐Au matrices with precisely controlled atomic arrangements coordination environments are synthesized via facet engineering ‐to‐H production. Surprisingly,...
Accelerating the alkaline hydrogen evolution reaction (HER), which involves slow cleavage of HO-H bonds and adsorption/desorption (H*) hydroxyl (OH*) intermediates, requires developing catalysts with optimal binding strengths for these intermediates. Here, unconventional hexagonal close-packed (HCP) high-entropy alloy (HEA) atomic layers are prepared composed five platinum-group metals to enhance HER synergistically. The breakthrough is made by layer-by-layer heteroepitaxial deposition...
The crystal phase with a specific stacking sequence of atoms largely affects the catalytic performance metal nanocrystals. Since control at same composition is extremely difficult, phase-dependent nanocrystals studied rarely. Here, we show synthesis Ru different percentages face-centered cubic (FCC) and hexagonal close-packed (HCP) phases via kinetic control, further revealing quantitative correlation between percentage initial reduction rate Ru(III) precursors. Specifically, manipulate...
Abstract With Pd as an example, a set of quantitative analyses is designed to shed light on the bromide‐mediated reduction kinetics and oxidative etching in determining twin structure facet nanocrystals. The success this work relies kinetic measurements Pd(II) precursor close examinations resultant seeds nanocrystals at different stages synthesis. We observe there clear trend where low, moderate, high initial rates regulated by Br − ions correspond formation with singly‐twinned,...
Abstract High‐entropy‐alloy (HEA) nanocrystals hold immense potential for catalysis, offering virtually unlimited alloy combinations through the inclusion of at least five constituent elements in varying ratios. However, general and effective strategies synthesizing libraries HEA with controlled surface atomic structures remain scarce. In this study, a transferable strategy developing library facet‐controlled seed@HEA seed‐mediated growth is presented. The synthesis core–shell incorporating...
Abstract High-entropy-alloy (HEA) nanocrystals consisting of a minimum five elements have recently emerged as versatile family catalysts due to immense chemical space and tunability 1-3 . However, there are no effective strategies for synthesizing libraries HEA with controlled surface atomic structures exposed facets boosting catalytic performance 4-19 Due the distinct nucleation growth kinetics constituent metals their distinctive crystal structures, it is incredibly challenging confine or...