Nanoporous high-entropy alloy by liquid metal dealloying

Artem Vladimirovich Okulov; Soo Hyun Joo; Hyoung Seop Kim; Hidemi Kato; Ilya Vladimirovich Okulov

doi:10.3390/met10101396

Nanoporous high-entropy alloy by liquid metal dealloying

Artem Vladimirovich Okulov, Soo Hyun Joo, Hyoung Seop Kim, Hidemi Kato, Ilya Vladimirovich Okulov

IMR - Materials Development Division

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

High-entropy nanomaterials possessing high accessible surface areas have demonstrated outstanding catalytic performance, beating that found for noble metals. In this communication, wereport about the synthesis of a new, nanoporous, high-entropy alloy (HEA) possessing open porosity. The nanoporous, high-entropy Ta_19.1Mo_20.5Nb_22.9V₃₀Ni_7.5 alloy (at%) was fabricated from a precursor (TaMoNbV)₂₅Ni₇₅ alloy (at%) by liquid metal dealloying using liquid magnesium (Mg). Directly after dealloying, the bicontinuous nanocomposite consisting of a Mg-rich phase and a phase with a bulk-centered cubic (bcc) structure was formed. The Mg-rich phase was removed with a 3M aqueous solution of nitric acid to obtain the open, porous, high-entropy Ta_19.1Mo_20.5Nb_22.9V₃₀Ni_7.5 alloy (at%). The ligament size of this nanoporous HEA is about 69 ± 9 nm, indicating the high surface area in this material.

Original language	English
Article number	1396
Pages (from-to)	1-7
Number of pages	7
Journal	Metals
Volume	10
Issue number	10
DOIs	https://doi.org/10.3390/met10101396
Publication status	Published - 2020 Oct

Keywords

Catalysis
Dealloying
High-entropy alloy
Liquid metal dealloying
Nanoporous

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10.3390/met10101396

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title = "Nanoporous high-entropy alloy by liquid metal dealloying",

abstract = "High-entropy nanomaterials possessing high accessible surface areas have demonstrated outstanding catalytic performance, beating that found for noble metals. In this communication, wereport about the synthesis of a new, nanoporous, high-entropy alloy (HEA) possessing open porosity. The nanoporous, high-entropy Ta19.1Mo20.5Nb22.9V30Ni7.5 alloy (at%) was fabricated from a precursor (TaMoNbV)25Ni75 alloy (at%) by liquid metal dealloying using liquid magnesium (Mg). Directly after dealloying, the bicontinuous nanocomposite consisting of a Mg-rich phase and a phase with a bulk-centered cubic (bcc) structure was formed. The Mg-rich phase was removed with a 3M aqueous solution of nitric acid to obtain the open, porous, high-entropy Ta19.1Mo20.5Nb22.9V30Ni7.5 alloy (at%). The ligament size of this nanoporous HEA is about 69 ± 9 nm, indicating the high surface area in this material.",

keywords = "Catalysis, Dealloying, High-entropy alloy, Liquid metal dealloying, Nanoporous",

author = "Okulov, {Artem Vladimirovich} and Joo, {Soo Hyun} and Kim, {Hyoung Seop} and Hidemi Kato and Okulov, {Ilya Vladimirovich}",

note = "Funding Information: Funding: This research was funded by the International Collaboration Center, Institute for Materials Research (ICC-IMR), Tohoku University, Japan (no grant number) and the German Science Foundation under the Leibniz Program, grant number MA 3333/13-1. Publisher Copyright: {\textcopyright} 2020 by the authors. Licensee MDPI, Basel, Switzerland.",

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doi = "10.3390/met10101396",

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AU - Okulov, Artem Vladimirovich

AU - Joo, Soo Hyun

AU - Kim, Hyoung Seop

AU - Kato, Hidemi

AU - Okulov, Ilya Vladimirovich

N1 - Funding Information: Funding: This research was funded by the International Collaboration Center, Institute for Materials Research (ICC-IMR), Tohoku University, Japan (no grant number) and the German Science Foundation under the Leibniz Program, grant number MA 3333/13-1. Publisher Copyright: © 2020 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2020/10

Y1 - 2020/10

N2 - High-entropy nanomaterials possessing high accessible surface areas have demonstrated outstanding catalytic performance, beating that found for noble metals. In this communication, wereport about the synthesis of a new, nanoporous, high-entropy alloy (HEA) possessing open porosity. The nanoporous, high-entropy Ta19.1Mo20.5Nb22.9V30Ni7.5 alloy (at%) was fabricated from a precursor (TaMoNbV)25Ni75 alloy (at%) by liquid metal dealloying using liquid magnesium (Mg). Directly after dealloying, the bicontinuous nanocomposite consisting of a Mg-rich phase and a phase with a bulk-centered cubic (bcc) structure was formed. The Mg-rich phase was removed with a 3M aqueous solution of nitric acid to obtain the open, porous, high-entropy Ta19.1Mo20.5Nb22.9V30Ni7.5 alloy (at%). The ligament size of this nanoporous HEA is about 69 ± 9 nm, indicating the high surface area in this material.

AB - High-entropy nanomaterials possessing high accessible surface areas have demonstrated outstanding catalytic performance, beating that found for noble metals. In this communication, wereport about the synthesis of a new, nanoporous, high-entropy alloy (HEA) possessing open porosity. The nanoporous, high-entropy Ta19.1Mo20.5Nb22.9V30Ni7.5 alloy (at%) was fabricated from a precursor (TaMoNbV)25Ni75 alloy (at%) by liquid metal dealloying using liquid magnesium (Mg). Directly after dealloying, the bicontinuous nanocomposite consisting of a Mg-rich phase and a phase with a bulk-centered cubic (bcc) structure was formed. The Mg-rich phase was removed with a 3M aqueous solution of nitric acid to obtain the open, porous, high-entropy Ta19.1Mo20.5Nb22.9V30Ni7.5 alloy (at%). The ligament size of this nanoporous HEA is about 69 ± 9 nm, indicating the high surface area in this material.

KW - Catalysis

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KW - High-entropy alloy

KW - Liquid metal dealloying

KW - Nanoporous

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Nanoporous high-entropy alloy by liquid metal dealloying

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