High Entropy and Low Symmetry: Triclinic High-Entropy Molybdates

Stenzel, David; Issac, Ibrahim; Wang, Kai; Azmi, Raheleh; Singh, Ruby; Jeong, Jaehoon; Najib, Saleem; Bhattacharya, S. S.; Hahn, Horst; Brezesinski, Torsten; Schweidler, Simon; Breitung, Ben

doi:10.1021/acs.inorgchem.0c02501

Cited by 15 publications

(13 citation statements)

References 68 publications

(100 reference statements)

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“…Stenzel et al. reported the first triclinic HEO (Mg 1/5 Fe 1/5 Ni 1/5 Cu 1/5 Zn 1/5 )MoO 4 , 99 suggesting that structural and electrostatic compliance, not necessarily long‐range symmetry, play a strong role in facilitating the high‐entropy condition.…”

Section: Historical Perspectivementioning

confidence: 99%

High‐entropy oxides: Harnessing crystalline disorder for emergent functionality

et al. 2023

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High-entropy materials defy historical materials design paradigms by leveraging chemical disorder to kinetically stabilize novel crystalline solid solutions comprised of many end-members. Formulational diversity results in local crystal structures that are seldom found in conventional materials and can strongly influence macroscopic physical properties. Thermodynamically prescribed chemical flexibility provides a means to tune such properties. Additionally, kinetic metastability results in many possible atomic arrangements, including both solid-solution configurations and heterogeneous phase assemblies, depending on synthesis conditions. Local disorder induced by metastability, and extensive cation solubilities allowed by thermodynamics combine to give many high-entropy oxide systems utility as electrochemical, magnetic, thermal, dielectric, and optical materials. Though high-entropy materials research is maturing rapidly, much remains to be understood and many compositions still await discovery, exploration, and implementation.

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Section: Historical Perspectivementioning

confidence: 99%

High‐entropy oxides: Harnessing crystalline disorder for emergent functionality

et al. 2023

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“…The option for altervalent substitution with cerium provides an added dimension for tailoring the chemical, electronic, and acid-base properties of a solid for applications in, for example, catalysis, electrochemistry, photocatalysis, energy storage, and fuel cells. High-entropy single-phase solid solutions generally consist of metal alloys [165] or multi-metal oxides [166], borides, carbides, nitrides, sulfides, or silicides in which five or more elemental constituents in equimolar or near equimolar concentrations coexist within a single crystallographic structure. They have been found to provide new and improved chemical, mechanical, thermal, and electronic properties in a wide range of material applications, including electronics, ceramics, energy storage devices, magnets, and catalysts [167].…”

Section: Conclusion and Future Prospects For Cerium Oxide Catalystsmentioning

confidence: 99%

The Emergence of the Ubiquity of Cerium in Heterogeneous Oxidation Catalysis Science and Technology

Brazdil

2022

Catalysts

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Research into the incorporation of cerium into a diverse range of catalyst systems for a wide spectrum of process chemistries has expanded rapidly. This has been evidenced since about 1980 in the increasing number of both scientific research journals and patent publications that address the application of cerium as a component of a multi-metal oxide system and as a support material for metal catalysts. This review chronicles both the applied and fundamental research into cerium-containing oxide catalysts where cerium’s redox activity confers enhanced and new catalytic functionality. Application areas of cerium-containing catalysts include selective oxidation, combustion, NOx remediation, and the production of sustainable chemicals and materials via bio-based feedstocks, among others. The newfound interest in cerium-containing catalysts stems from the benefits achieved by cerium’s inclusion, which include selectivity, activity, and stability. These benefits arise because of cerium’s unique combination of chemical and thermal stability, its redox active properties, its ability to stabilize defect structures in multicomponent oxides, and its propensity to stabilize catalytically optimal oxidation states of other multivalent elements. This review surveys the origins and some of the current directions in the research and application of cerium oxide-based catalysts.

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“…49 Moreover, the synthesis of molybdates does not require any controlled atmosphere, such as the synthesis of high entropy phosphide, nitride, and uoride, which can reduce the fabrication cost. 26,50 In addition, molybdate catalysts are stable under harsh reaction conditions, such as high pH and elevated potentials, which are essential for the long-term operation of electrochemical devices. 49,51,52 Furthermore, molybdate-based catalysts can be easily modied and tuned by incorporating different dopants or by controlling their synthesis conditions.…”

Section: Introductionmentioning

confidence: 99%