Ionic liquid-hydroxide-mediated low-temperature synthesis of high-entropy perovskite oxide nanoparticles

Shi, Yingying; Xu, Qiuchen; Tian, Zhangmin; Liu, Guiying; Ma, Chenxu; Zheng, Wenjun

doi:10.1039/d1nr08316c

Cited by 13 publications

(7 citation statements)

References 53 publications

(75 reference statements)

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“…New synthesis methods should be developed in a controlled manner to obtain high-entropy materials with targeted atomic arrangements and surface compositions that may serve as model catalysts for fundamental understanding. [96] Also importantly, high-throughput computational techniques should be exploited to aid the screening and design of potential high-entropy catalysts and the understanding of their catalytic behaviors. [97][98][99][100] All these endeavors should be combined toward an improved understanding of the structure-property relationships of high-entropy materials for water electrolysis.…”

Section: Outlook and Perspectivesmentioning

confidence: 99%

High‐Entropy Materials for Water Electrolysis

2022

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Green hydrogen production by renewables‐powered water electrolysis holds the key to energy sustainability and a carbon‐neutral future. The sluggish kinetics of water‐splitting reactions, namely, hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), however, remains a bottleneck to the water electrolysis technology. High‐entropy materials, due to their compositional flexibility, structural stability, and synergy between various elemental components, have recently aroused considerable interest in catalyzing the water‐splitting reactions. Herein, a timely review of the recent achievements is provided in high‐entropy materials for water electrolysis. An overview of different kinds of high‐entropy materials for catalyzing the HER and OER half‐reactions is introduced, followed by a discussion of theoretical and experimental efforts in understanding the fundamental origins of the enhanced catalytic performance observed on high‐entropy catalysts. Various materials design strategies, including control of size and shape, construction of a porous structure, engineering of defect, and formation of hybrid/composite structure, to develop high‐entropy catalysts with improved catalytic performance are highlighted. Finally, the remaining challenges are pointed out and the corresponding perspectives to address these challenges are put forward to promote the development of the research field of high‐entropy water‐splitting catalysts.

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Section: Outlook and Perspectivesmentioning

confidence: 99%

High‐Entropy Materials for Water Electrolysis

2022

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“…The high entropy materials that have been synthesized and studied the most as colloidal nanoparticles are metal alloys, , due in large part to their desirable catalytic properties. Other classes of colloidal high entropy nanoparticles that have been reported include intermetallic compounds, − metal sulfides, − metal oxides, − and metal oxysulfides . Progress is also being made toward accessing additional types of colloidal high entropy nanoparticles.…”

Section: What Types Of Colloidal High Entropy Nanoparticles Have Been...mentioning

confidence: 99%

“…A polyol reaction, using ethylene glycol as a complexing agent and sodium hydroxide as a source of OH – , yielded nanosheets of a high entropy hydroxide containing Cr, Mn, Fe, Co, Ni, and Zn. The high entropy perovskites Ba(FeNbTiZrTa)O 3 , Ba(MnNbTiZrTa)O 3 , Ba(FeSnTiZrTa)O 3 , and Ba(FeVTiZrTa)O 3 , were made solvothermally as nanoparticulate powders using an ionic liquid . As is clear from these descriptions, high entropy nanoparticulate oxides can be synthesized using solution-based methods, but truly colloidal high entropy oxide nanoparticles of high crystalline quality are not usually produced.…”

Section: What Types Of Colloidal High Entropy Nanoparticles Have Been...mentioning

confidence: 99%

Colloidal Nanoparticles of High Entropy Materials: Capabilities, Challenges, and Opportunities in Synthesis and Characterization

Dey,

Soliman,

McCormick

et al. 2023

ACS Nanosci. Au

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Materials referred to as "high entropy" contain a large number of elements randomly distributed on the lattice sites of a crystalline solid, such that a high configurational entropy is presumed to contribute significantly to their formation and stability. High temperatures are typically required to achieve entropy stabilization, which can make it challenging to synthesize colloidal nanoparticles of high entropy materials. Nonetheless, strategies are emerging for the synthesis of colloidal high entropy nanoparticles, which are of interest for their synergistic properties and unique catalytic functions that arise from the large number of constituent elements and their interactions. In this Perspective, we highlight the classes of materials that have been made as colloidal high entropy nanoparticles as well as insights into the synthetic methods and the pathways by which they form. We then discuss the concept of "high entropy" within the context of colloidal materials synthesized at much lower temperatures than are typically required for entropy to drive their formation. Next, we identify and address challenges and opportunities in the field of high entropy nanoparticle synthesis. We emphasize aspects of materials characterization that are especially important to consider for nanoparticles of high entropy materials, including powder X-ray diffraction and elemental mapping with scanning transmission electron microscopy, which are among the most commonly used techniques in laboratory settings. Finally, we share perspectives on emerging opportunities and future directions involving colloidal nanoparticles of high entropy materials, with an emphasis on synthesis, characterization, and fundamental knowledge that is needed for anticipated advances in key application areas.

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“…17 But there are precedents for forming HEO nanocrystals at relatively low temperatures. 5,18 We propose that high temperatures are unnecessary due to the low K sp of oxides. 19,20 Precursor Monomer (irreversible)…”

Section: ■ Introductionmentioning

confidence: 99%

Colloidal Synthesis of Monodisperse High-Entropy Spinel Oxide Nanocrystals

Rowell,

Kang,

Yoon

et al. 2024

J. Am. Chem. Soc.

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Synthesis of high-entropy oxide (HEO) nanocrystals has focused on increasing the temperature in the entropy term (T(ΔS)) to overcome the enthalpy term. However, these high temperatures lead to large, polydisperse nanocrystals. In this work, we leverage the low solubility product (K sp ) of metal oxides and optimize the Lewis-acid-catalyzed esterification reaction for equal rate production of the cation monomers to synthesize HEO nanocrystals at low temperatures, producing the smallest (<4 nm) and most monodisperse (<15% size dispersity) HEOs to date. We apply these HEO nanocrystals as electrocatalysts, exhibiting promising activity toward the oxygen evolution reaction in alkaline media, with an overpotential of 345 mV at 10 mA/cm 2 .

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Ionic liquid-hydroxide-mediated low-temperature synthesis of high-entropy perovskite oxide nanoparticles

Abstract: High-entropy perovskite oxides (HEPOs) are attracting significant attentions due to their unique structures, unprecedented properties and great application potential in many ﬁelds, while available synthetic methods have many shortcomings, so...

Cited by 13 publications

References 53 publications

High‐Entropy Materials for Water Electrolysis

High‐Entropy Materials for Water Electrolysis

Colloidal Nanoparticles of High Entropy Materials: Capabilities, Challenges, and Opportunities in Synthesis and Characterization

Colloidal Synthesis of Monodisperse High-Entropy Spinel Oxide Nanocrystals

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