Nanoporous high-entropy alloys with low Pt loadings for high-performance electrochemical oxygen reduction

Li, Shiyin; Tang, X.; Jia, Henglei; Li, Huanglong; Xie, Guoqiang; Liu, Xingjun; Lin, Xi; Qiu, Hua‐Jun

doi:10.1016/j.jcat.2020.01.024

Cited by 162 publications

(73 citation statements)

References 62 publications

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“…Reducing the cost of the ORR catalyst is also important, especially considering their integration into practical devices such as fuel cells and metal-air batteries. Several attempts have been made to prepare nanoporous HEA alloys with low Pt contents ( 78 , 79 ). Schuhmann and colleagues ( 80 , 81 ) have systematically explored transition metal–based HEA electrocatalysts for ORR, with a particular focus on understanding the electrochemical behaviors on the multisite surface.…”

Section: Heas For Catalysismentioning

confidence: 99%

High-entropy materials for catalysis: A new frontier

2021

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Entropy plays a pivotal role in catalysis, and extensive research efforts have been directed to understanding the enthalpy-entropy relationship that defines the reaction pathways of molecular species. On the other side, surface of the catalysts, entropic effects have been rarely investigated because of the difficulty in deciphering the increased complexities in multicomponent systems. Recent advances in high-entropy materials (HEMs) have triggered broad interests in exploring entropy-stabilized systems for catalysis, where the enhanced configurational entropy affords a virtually unlimited scope for tailoring the structures and properties of HEMs. In this review, we summarize recent progress in the discovery and design of HEMs for catalysis. The correlation between compositional and structural engineering and optimization of the catalytic behaviors is highlighted for high-entropy alloys, oxides, and beyond. Tuning composition and configuration of HEMs introduces untapped opportunities for accessing better catalysts and resolving issues that are considered challenging in conventional, simple systems.

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Section: Heas For Catalysismentioning

confidence: 99%

High-entropy materials for catalysis: A new frontier

2021

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“…This suggests that coordination and ligand effects are at the same order of magnitude, and therefore neither effect can be ignored. Additionally, experimentally synthesized HEA catalysts, including nanoparticles (through the carbothermal shock method) 15 and nanoporous samples (through dealloying), 5,6,16 are observed to exhibit a wide range of surface structures; therefore, in-depth theoretical investigations are needed to uncover these complex geometric effects on catalyst activity. HEAs additionally exhibits surface defects, such as vacancy, dislocation, and grain boundary, albeit possessing the same bulk structure (e.g., fcc).…”

Section: Progress and Potentialmentioning

confidence: 99%

Neural Network-Assisted Development of High-Entropy Alloy Catalysts: Decoupling Ligand and Coordination Effects

Chen

Singh

2020

Matter

104

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“…It is well established that a rational design of HEA composition allows controlling their physicochemical properties at the nanoscale and performance, e.g., in catalysis [12,15,16] and energy storage [17][18][19]. Due to these unique interactions of distinct neighboring metal atoms [2], HEA NPs are discussed and developed as very promising candidates to replace established but scarce and expensive noble metals in catalytic reactions such as oxygen evolution [20][21][22][23][24], oxygen reduction [2,25,26], methanol oxidation [27][28][29], CO 2 reduction [30,31] and hydrogen evolution [22,32,33]. As a potential reason for the outstanding catalytic performance of HEA NPs, the presence of multiple, energetically different adsorption sites on the catalyst [2] forming an adsorption energy distribution pattern (AEDP) [34] is frequently discussed.…”

Section: Introductionmentioning

confidence: 99%

Laser-generated high entropy metallic glass nanoparticles as bifunctional electrocatalysts

Johny

Kamp

et al. 2021

Nano Res.

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High entropy metallic glass nanoparticles (HEMG NPs) are very promising materials for energy conversion due to the wide tuning possibilities of electrochemical potentials offered by their multimetallic character combined with an amorphous structure. Up until now, the generation of these HEMG NPs involved tedious synthesis procedures where the generated particles were only available on highly specialized supports, which limited their widespread use. Hence, more flexible synthetic approaches to obtain colloidal HEMG NPs for applications in energy conversion and storage are highly desirable. We utilized pulsed laser ablation of bulk high entropy alloy targets in acetonitrile to generate colloidal carbon-coated CrCoFeNiMn and CrCoFeNiMnMo HEMG NPs. An in-depth analysis of the structure and elemental distribution of the obtained nanoparticles down to single-particle levels using advanced transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) methods revealed amorphous quinary and senary alloy phases with slight manganese oxide/hydroxide surface segregation, which were stabilized within graphitic shells. Studies on the catalytic activity of the corresponding carbon-HEMG NPs during oxygen evolution and oxygen reduction reactions revealed an elevated activity upon the incorporation of moderate amounts of Mo into the amorphous alloy, probably due to the defect generation by atomic size mismatch. Furthermore, we demonstrate the superiority of these carbon-HEMG NPs over their crystalline analogies and highlight the suitability of these amorphous multi-elemental NPs in electrocatalytic energy conversion.

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Nanoporous high-entropy alloys with low Pt loadings for high-performance electrochemical oxygen reduction

Cited by 162 publications

References 62 publications

High-entropy materials for catalysis: A new frontier

High-entropy materials for catalysis: A new frontier

Neural Network-Assisted Development of High-Entropy Alloy Catalysts: Decoupling Ligand and Coordination Effects

Laser-generated high entropy metallic glass nanoparticles as bifunctional electrocatalysts

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