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Title: Facile synthesis of high surface area molybdenum nitride and carbide

The synthesis of high surface area γ-Mo{sub 2}N and α-Mo{sub 2}C is reported (116 and 120 m{sup 2}/g) without the temperature programmed reduction of MoO{sub 3}. γ-Mo{sub 2}N was prepared in an NH{sub 3}-free synthesis using forming gas (7 at% H{sub 2}, N{sub 2}-balance) as the reactive atmosphere. Three precursors were studied ((NH{sub 4}){sub 6}Mo{sub 7}O{sub 24}·4H{sub 2}O, (NH{sub 4}){sub 2} Mg(MoO{sub 4}){sub 2}, and MgMoO{sub 4}) along with the sacrificial support method (SSM) as a means of reducing the particle size of Mo{sub 2}N and Mo{sub 2}C. In situ X-ray diffraction (XRD) studies were carried out to identify reaction intermediates, the temperature at which various intermediates form, and the average domain size of the Mo{sub 2}N products. Materials were synthesized in bulk and further characterized by XRD, HRTEM, XPS, and BET. - Highlights: • Facile synthesis of γ-Mo2N and α-Mo2C with surface area exceeding 100 m{sup 2}/g. • Sacrificial support method was used to achieve these high surface areas. • Materials can serve as catalysts or supports in (electro)chemical processes.
Authors:
; ;  [1] ;  [2] ;  [1] ;  [1]
  1. Department of Chemical and Biological Engineering and Center for Micro-Engineered Materials, University of New Mexico, NM 87131 (United States)
  2. Sensors and Electrochemical Devices (MPA-11), Los Alamos National Laboratory, NM 87545 (United States)
Publication Date:
OSTI Identifier:
22486742
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 228; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; AMMONIUM COMPOUNDS; CATALYSIS; CATALYSTS; FUEL CELLS; HYDROGEN; MAGNESIUM COMPOUNDS; MOLYBDATES; MOLYBDENUM; MOLYBDENUM CARBIDES; MOLYBDENUM NITRIDES; MOLYBDENUM OXIDES; PARTICLE SIZE; PRECURSOR; REACTION INTERMEDIATES; REDUCTION; SURFACE AREA; SYNTHESIS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY