Mechanochemical-Assisted Synthesis of High-Entropy Metal Nitride via a Soft Urea Strategy

Tian Jin; Xiahan Sang; Raymond R. Unocic; Richard T. Kinch; Xiaofei Liu; Jun Hu; Honglai Liu; Sheng Dai

doi:10.1002/adma.201707512

Mechanochemical-Assisted Synthesis of High-Entropy Metal Nitride via a Soft Urea Strategy

Tian Jin, Xiahan Sang, Raymond R. Unocic, Richard T. Kinch, Xiaofei Liu, Jun Hu, Honglai Liu, Sheng Dai

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

406 Scopus citations

Abstract

Crystalline high-entropy ceramics (CHC), a new class of solids that contain five or more elemental species, have attracted increasing interest because of their unique structure and potential applications. Up to now, only a couple of CHCs (e.g., high-entropy metal oxides and diborides) have been successfully synthesized. Here, a new strategy for preparing high-entropy metal nitride (HEMN-1) is proposed via a soft urea method assisted by mechanochemical synthesis. The as-prepared HEMN-1 possesses five highly dispersed metal components, including V, Cr, Nb, Mo, Zr, and simultaneously exhibits an interesting cubic crystal structure of metal nitrides. By taking advantage of these unique features, HEMN-1 can function as a promising candidate for supercapacitor applications. A specific capacitance of 78 F g⁻¹ is achieved at a scan rate of 100 mV s⁻¹ in 1 m KOH. In addition, such a facile synthetic strategy can be further extended to the fabrication of other types of HEMNs, paving the way for the synthesis of HEMNs with attractive properties for task-specific applications.

Original language	English
Article number	1707512
Journal	Advanced Materials
Volume	30
Issue number	23
DOIs	https://doi.org/10.1002/adma.201707512
State	Published - Jun 6 2018

Funding

This research was supported by the Fluid Interface Reactions, Structures, and Transport, an Energy Frontier Research Center–US Department of Energy, Office of Science, Office of Basic Energy Sciences. Electron microscopy was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. T.J. and X.L. were financially supported to study at UTK by the National Basic Research Program of China (21507030) and the 111 Project of Ministry of Education of China (No. B08021). H.J. and H.L. were involved in discussion on XRD structural characterizations. SD wanted to acknowledge the initial discussion of research on high-entropy materials with Dr. Brian C. Sales at Oak Ridge.

Funders	Funder number
111 Project of Ministry of Education of China	B08021
U.S. Department of Energy
Office of Science
Basic Energy Sciences
National Key Research and Development Program of China	21507030
National Key Research and Development Program of China

Keywords

ball milling
high-entropy
mechanochemical
multimetal nitride
supercapacitors

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title = "Mechanochemical-Assisted Synthesis of High-Entropy Metal Nitride via a Soft Urea Strategy",

abstract = "Crystalline high-entropy ceramics (CHC), a new class of solids that contain five or more elemental species, have attracted increasing interest because of their unique structure and potential applications. Up to now, only a couple of CHCs (e.g., high-entropy metal oxides and diborides) have been successfully synthesized. Here, a new strategy for preparing high-entropy metal nitride (HEMN-1) is proposed via a soft urea method assisted by mechanochemical synthesis. The as-prepared HEMN-1 possesses five highly dispersed metal components, including V, Cr, Nb, Mo, Zr, and simultaneously exhibits an interesting cubic crystal structure of metal nitrides. By taking advantage of these unique features, HEMN-1 can function as a promising candidate for supercapacitor applications. A specific capacitance of 78 F g−1 is achieved at a scan rate of 100 mV s−1 in 1 m KOH. In addition, such a facile synthetic strategy can be further extended to the fabrication of other types of HEMNs, paving the way for the synthesis of HEMNs with attractive properties for task-specific applications.",

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author = "Tian Jin and Xiahan Sang and Unocic, {Raymond R.} and Kinch, {Richard T.} and Xiaofei Liu and Jun Hu and Honglai Liu and Sheng Dai",

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AU - Jin, Tian

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AU - Liu, Xiaofei

AU - Hu, Jun

AU - Liu, Honglai

AU - Dai, Sheng

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N2 - Crystalline high-entropy ceramics (CHC), a new class of solids that contain five or more elemental species, have attracted increasing interest because of their unique structure and potential applications. Up to now, only a couple of CHCs (e.g., high-entropy metal oxides and diborides) have been successfully synthesized. Here, a new strategy for preparing high-entropy metal nitride (HEMN-1) is proposed via a soft urea method assisted by mechanochemical synthesis. The as-prepared HEMN-1 possesses five highly dispersed metal components, including V, Cr, Nb, Mo, Zr, and simultaneously exhibits an interesting cubic crystal structure of metal nitrides. By taking advantage of these unique features, HEMN-1 can function as a promising candidate for supercapacitor applications. A specific capacitance of 78 F g−1 is achieved at a scan rate of 100 mV s−1 in 1 m KOH. In addition, such a facile synthetic strategy can be further extended to the fabrication of other types of HEMNs, paving the way for the synthesis of HEMNs with attractive properties for task-specific applications.

AB - Crystalline high-entropy ceramics (CHC), a new class of solids that contain five or more elemental species, have attracted increasing interest because of their unique structure and potential applications. Up to now, only a couple of CHCs (e.g., high-entropy metal oxides and diborides) have been successfully synthesized. Here, a new strategy for preparing high-entropy metal nitride (HEMN-1) is proposed via a soft urea method assisted by mechanochemical synthesis. The as-prepared HEMN-1 possesses five highly dispersed metal components, including V, Cr, Nb, Mo, Zr, and simultaneously exhibits an interesting cubic crystal structure of metal nitrides. By taking advantage of these unique features, HEMN-1 can function as a promising candidate for supercapacitor applications. A specific capacitance of 78 F g−1 is achieved at a scan rate of 100 mV s−1 in 1 m KOH. In addition, such a facile synthetic strategy can be further extended to the fabrication of other types of HEMNs, paving the way for the synthesis of HEMNs with attractive properties for task-specific applications.

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Mechanochemical-Assisted Synthesis of High-Entropy Metal Nitride via a Soft Urea Strategy

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