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  Nano-scale new Heusler compounds NiRh2Sb and CuRh2Sb: synthesis, characterization, and application as electrocatalysts

Wang, Y., Fecher, G. H., Subakti, S., Lubk, A., Hantusch, M., Schnelle, W., et al. (2023). Nano-scale new Heusler compounds NiRh2Sb and CuRh2Sb: synthesis, characterization, and application as electrocatalysts. Journal of Materials Chemistry A, 11(5), 2302-2313. doi:10.1039/d2ta08150d.

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 Creators:
Wang, Yiran1, Author
Fecher, Gerhard H.2, Author           
Subakti, Subakti1, Author
Lubk, Axel1, Author
Hantusch, Martin1, Author
Schnelle, Walter3, Author           
Kaiser, Felix4, Author           
Doert, Thomas1, Author
Ruck, Michael5, Author           
Affiliations:
1External Organizations, ou_persistent22              
2Gerhard Fecher, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863431              
3Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863441              
4Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
5Michael Ruck, Max Planck Fellow, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863444              

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 Abstract: Two Heusler compounds NiRh2Sb and CuRh2Sb were synthesized for the first time and their crystal structures were determined by combined X-ray diffraction and high-resolution electron microscopy. Two synthesis routes were applied: a one-pot polyol reduction of metal cations at 280-290 degrees C under microwave radiation yielded nanocrystalline particles of 3-6 nm, whereas intergrown microcrystalline samples were obtained by conventional high-temperature synthesis at 700 degrees C starting from the elements. NiRh2Sb is an orthorhombic Heusler compound that crystallizes in space group Cmcm with lattice parameters a = 6.9188(1) angstrom, b = 5.7917(1) angstrom and c = 5.7374(1) angstrom. CuRh2Sb is dimorphic; depending on the synthesis conditions, it either adopts the cubic space group Fm3m with a lattice parameter of a = 6.1235(1) angstrom, or the tetragonal space group I4/mmm with lattice parameters a = 4.1859(1) angstrom and c = 6.6375(1) angstrom. The transition between the cubic and tetragonal structures of CuRh2Sb is attributed to a reversible band Jahn-Teller distortion as suggested by density functional theory-based calculations. Electrical resistivities evidence metallic behavior for both compounds in accordance with the computed band structures and the density-of-states. Both compounds are Pauli paramagnetic and show no magnetic ordering between room temperature and 2 K. The electrocatalytic performances of the nano-scale intermetallics were tested with the electrolysis of water, and both were found to greatly reduce the overpotential of both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) with a large electrochemically active surface area.

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Language(s): eng - English
 Dates: 2023-01-052023-01-05
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000913701400001
DOI: 10.1039/d2ta08150d
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Title: Journal of Materials Chemistry A
  Abbreviation : J. Mater. Chem. A
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 11 (5) Sequence Number: - Start / End Page: 2302 - 2313 Identifier: ISSN: 2050-7488
CoNE: https://pure.mpg.de/cone/journals/resource/2050-7488