High-entropy-alloy nanoparticles

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Schematic of a high-entropy alloy nanoparticle with 5 types of atoms with different sizes.

High-entropy-alloy nanoparticles (HEA-NPs) are nanoparticles having five or more elements alloyed in a single-phase solid solution structure.[1] HEA-NPs possess a wide range of compositional library, distinct alloy mixing structure, and nanoscale size effect, giving them huge potential in catalysis, energy, environmental, and biomedical applications.

Enabling synthesis[edit]

HEA-NPs are a structural analog to bulk high-entropy alloys (HEAs),[2][3] but synthesized at the nanoscale. The formation of HEAs typically requires high temperature for multi-element mixing; however, high temperature acts against nano-material synthesis due to high-temperature-induced structure aggregation and surface reconstruction.

In 2018, HEA-NPs were firstly synthesized by a carbothermal shock synthesis.[1] (The material and technology are patented.[4][5]) The carbothermal shock employs a rapid high-temperature heating (e.g. 2000 K, in 55 ms) to enable the non-equilibrium synthesis of HEA-NPs with uniform size and homogeneous mixing despite containing immiscible combinations. Although rapid quenching is desired to maintain the solid-solution state, too fast cooling rate can hinder structural ordering. Therefore, the cooling rate should be chosen carefully based on the temperature-time-transformation diagram.[6]

Another guide that can be used for the synthesis is the Ellingham diagram. Elements at the top of the diagram are easily reduced and tend to form HEA-NPs, while elements at the bottom of the diagram tend to form high-entropy oxide NPs.[6]

Later, other similar non-equilibrium "shock" methods were also introduced to synthesize HEA-NPs and other types of high entropy nanostructures.[7][8][9] Recently, a low temperature synthesis through simultaneous multi-cation exchange (below 900 K) has been demonstrated for high-entropy metal sulfide NPs, which may be applied to metal selenides, tellurides, phosphides, and halides as well.[10]

Structural analysis[edit]

Due to the random distribution of elements in HEA-NPs, in addition to conventional characterization methods, other methods with higher resolution are needed for their structural analysis. To analyze the random mixing of multiple elements, atomic electron tomography can be used, which provides positional precision of 21 pm and identification of atoms by periods.[11] Furthermore, X-ray absorption spectroscopy can give information on local coordination environments, while extended X-ray absorption fine structure can be used to get coordination numbers and bond distances.[12] Combined with hard X-ray photoelectron spectroscopy or X-ray absorption near-edge structure, these analyses can be used to explore structure–property relationships in HEA-NPs.[13] In addition, due to the immense number of possibilities of compositions and surfaces (i.e., terrace, edge, and corner) available for HEA-NPs, simulations such as density functional theory calculations are also popularly used for their analysis.[14]

Properties and applications[edit]

HEA-NPs have a large compositional library, which enables tunability in chemical composition, structure, and associated properties. In HEA-NPs, the same type of atoms can have different local density of states because their neighboring atom compositions can be different.[13] Such variations in local environment lead to diverse and tunable adsorption energy levels, which can be beneficial to satisfy the Sabatier principle especially for complex reactions.[6]

In addition, owing to the high entropy structure, HEA-NPs typically show improved structural stability. One suggested mechanism for the enhanced structural stability is through prevention of phase separation due to lattice distortions from different sized elements acting as diffusion barriers.[15] With the above merits, HEA-NPs have been used as high-performance catalysts for both thermochemical and electrochemical reactions, such as ammonia oxidation, decomposition, and water splitting.[1][16][17][18] High throughput and data mining approaches are being implemented toward accelerated materials discovery in the multi-dimensional space of HEA-NPs.[19][20]

References[edit]

  1. ^ a b c Yao, Yonggang; Huang, Zhennan; Xie, Pengfei; Lacey, Steven D.; Jacob, Rohit Jiji; Xie, Hua; Chen, Fengjuan; Nie, Anmin; Pu, Tiancheng; Rehwoldt, Miles; Yu, Daiwei (2018-03-30). "Carbothermal shock synthesis of high-entropy-alloy nanoparticles". Science. 359 (6383): 1489–1494. Bibcode:2018Sci...359.1489Y. doi:10.1126/science.aan5412. ISSN 0036-8075. PMID 29599236.
  2. ^ Yeh, J.-W.; Chen, S.-K.; Lin, S.-J.; Gan, J.-Y.; Chin, T.-S.; Shun, T.-T.; Tsau, C.-H.; Chang, S.-Y. (2004). "Nanostructured High-Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes". Advanced Engineering Materials. 6 (5): 299–303. doi:10.1002/adem.200300567. ISSN 1527-2648. S2CID 137380231.
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  4. ^ US 2019161840, Yao, Yonggang & Hu, Liangbing, "Thermal shock synthesis of multielement nanoparticles", published 2019-05-30, assigned to University of Maryland 
  5. ^ US 2018369771, Hu, Liangbing; Chen, Yanan & Yao, Yonggang, "Nanoparticles and Systems and Methods for Synthesizing Nanoparticles Through Thermal Shock", published 2018-12-27, assigned to University of Maryland 
  6. ^ a b c Yao, Yonggang; Dong, Qi; Brozena, Alexandra; Luo, Jian; Miao, Jianwei; Chi, Miaofang; Wang, Chao; Kevrekidis, Ioannis G.; Ren, Zhiyong Jason; Greeley, Jeffrey; Wang, Guofeng; Anapolsky, Abraham; Hu, Liangbing (2022-04-08). "High-entropy nanoparticles: Synthesis-structure-property relationships and data-driven discovery". Science. 376 (6589): eabn3103. doi:10.1126/science.abn3103. ISSN 0036-8075. PMID 35389801. S2CID 248024069.
  7. ^ Yang, Yong; Song, Boao; Ke, Xiang; Xu, Feiyu; Bozhilov, Krassimir N.; Hu, Liangbing; Shahbazian-Yassar, Reza; Zachariah, Michael R. (2020-03-03). "Aerosol Synthesis of High Entropy Alloy Nanoparticles". Langmuir. 36 (8): 1985–1992. doi:10.1021/acs.langmuir.9b03392. ISSN 0743-7463. PMID 32045255. S2CID 211087047.
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  10. ^ McCormick, Connor R.; Schaak, Raymond E. (2021-01-20). "Simultaneous Multication Exchange Pathway to High-Entropy Metal Sulfide Nanoparticles". Journal of the American Chemical Society. 143 (2): 1017–1023. doi:10.1021/jacs.0c11384. ISSN 0002-7863. PMID 33405919. S2CID 230810629.
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  12. ^ Morris, David; Yao, Yonggang; Finfrock, Y. Zou; Huang, Zhennan; Shahbazian-Yassar, Reza; Hu, Liangbing; Zhang, Peng (2021-11-17). "Composition-dependent structure and properties of 5- and 15-element high-entropy alloy nanoparticles". Cell Reports Physical Science. 2 (11): 100641. Bibcode:2021CRPS....200641M. doi:10.1016/j.xcrp.2021.100641. ISSN 2666-3864. S2CID 243775798.
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  19. ^ Yao, Yonggang; Liu, Zhenyu; Xie, Pengfei; Huang, Zhennan; Li, Tangyuan; Morris, David; Finfrock, Zou; Zhou, Jihan; Jiao, Miaolun; Gao, Jinlong; Mao, Yimin (2020). "Computationally aided, entropy-driven synthesis of highly efficient and durable multi-elemental alloy catalysts". Science Advances. 6 (11): eaaz0510. Bibcode:2020SciA....6..510Y. doi:10.1126/sciadv.aaz0510. ISSN 2375-2548. PMC 7069714. PMID 32201728.
  20. ^ Yao, Yonggang; Huang, Zhennan; Li, Tangyuan; Wang, Hang; Liu, Yifan; Stein, Helge S.; Mao, Yimin; Gao, Jinlong; Jiao, Miaolun; Dong, Qi; Dai, Jiaqi (2020-03-24). "High-throughput, combinatorial synthesis of multimetallic nanoclusters". Proceedings of the National Academy of Sciences. 117 (12): 6316–6322. Bibcode:2020PNAS..117.6316Y. doi:10.1073/pnas.1903721117. ISSN 0027-8424. PMC 7104385. PMID 32156723.

See also[edit]

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