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Title: Molybdenum nitrides as oxygen reduction reaction catalysts: Structural and electrochemical studies

Journal Article · · Inorganic Chemistry
DOI:https://doi.org/10.1021/ic5024778· OSTI ID:1330514
 [1];  [2];  [3];  [1]
  1. Stony Brook Univ., Stony Brook, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)

Monometallic (δ-MoN, Mo5N6, and Mo2N) and bimetallic molybdenum nitrides (Co0.6Mo1.4N2) were investigated as electrocatalysts for the oxygen reduction reaction (ORR), which is a key half-reaction in hydrogen fuel cells. Monometallic hexagonal molybdenum nitrides are found to exhibit improved activities over rock salt type molybdenum nitride (γ-Mo2N), suggesting that improvements are due to either the higher molybdenum valence or a more favorable coordination environment in the hexagonal structures. Further enhancements in activity were found for hexagonal bimetallic cobalt molybdenum nitride (Co0.6Mo1.4N2), resulting in a modest onset potential of 0.713 V versus reversible hydrogen electrode (RHE). Co0.6Mo1.4N2 exhibits good stability in acidic environments, and in the potential range lower than 0.5 V versus RHE, the ORR appears to proceed via a four-electron mechanism based on the analysis of rotating disc electrode results. A redetermination of the structures of the binary molybdenum nitrides was carried out using neutron diffraction data, which is far more sensitive to nitrogen site positions than X-ray diffraction data. In conclusion, the revised monometallic hexagonal nitride structures all share many common features with the Co0.6Mo1.4N2 structure, which has alternating layers of cations in octahedral and trigonal prismatic coordination, and are thus not limited to only trigonal prismatic Mo environments (as was originally postulated for δ-MoN).

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1330514
Journal Information:
Inorganic Chemistry, Vol. 54, Issue 5; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 79 works
Citation information provided by
Web of Science

References (18)

What Are Batteries, Fuel Cells, and Supercapacitors? journal October 2004
Activity benchmarks and requirements for Pt, Pt-alloy, and non-Pt oxygen reduction catalysts for PEMFCs journal March 2005
Recent development of non-platinum catalysts for oxygen reduction reaction journal December 2005
A review on non-precious metal electrocatalysts for PEM fuel cells journal January 2011
A review of Fe–N/C and Co–N/C catalysts for the oxygen reduction reaction journal June 2008
Titanium nitride nanoparticles based electrocatalysts for proton exchange membrane fuel cells journal January 2009
A novel non-noble electrocatalyst for PEM fuel cell based on molybdenum nitride journal May 2006
Methanol-tolerant MoN electrocatalyst synthesized through heat treatment of molybdenum tetraphenylporphyrin for four-electron oxygen reduction reaction journal March 2008
Theoretical and Experimental Studies on the Relationship between the Structures of Molybdenum Nitrides and Their Catalytic Activities toward the Oxygen Reduction Reaction journal October 2010
Determination of the crystal structure of δ-MoN by neutron diffraction journal April 2004
Synthesis and characterisation of hexagonal molybdenum nitrides journal August 2006
New routes to transition metal nitrides: and characterization of new phases journal January 1999
Synthesis, Electronic and Magnetic Characterization of the Ternary Nitride (Fe0.8Mo0.2)MoN2 journal October 1995
Mixed Close-Packed Cobalt Molybdenum Nitrides as Non-noble Metal Electrocatalysts for the Hydrogen Evolution Reaction journal December 2013
Synthesis and magnetic characterization of CoMoN2 nanoparticles journal May 2009
Surface Studies of Passivated Molybdenum Oxynitride journal April 1997
Amorphous Molybdenum Sulfide Catalysts for Electrochemical Hydrogen Production: Insights into the Origin of their Catalytic Activity journal August 2012
Synthesis of MoS2 and MoSe2 Films with Vertically Aligned Layers journal February 2013

Cited By (16)

Phase Stability and Compressibility of 3R-MoN2 at High Pressure journal July 2019
Emerging new generation electrocatalysts for the oxygen reduction reaction journal January 2016
Recent advances in nanostructured metal nitrides for water splitting journal January 2018
Recent advancements in Pt-nanostructure-based electrocatalysts for the oxygen reduction reaction journal January 2019
A rationally designed Fe-tetrapyridophenazine complex: a promising precursor to a single-atom Fe catalyst for an efficient oxygen reduction reaction in high-power Zn–air cells journal January 2018
Geometries, electronic properties and stability of molybdenum and tungsten nitrides low-index surfaces journal September 2018
Earth-Abundant Nanomaterials for Oxygen Reduction journal December 2015
Synergism of molybdenum nitride and palladium for high-efficiency formic acid electrooxidation journal January 2018
Fe 2 O 3 Nanoparticles Modified 2D N‐Doped Porous Graphene‐like Carbon as an Efficient and Robust Electrocatalyst for Oxygen Reduction Reaction journal April 2019
The Electrocatalytic Stability Investigation of a Proton Manager MOF for the Oxygen Reduction Reaction in Acidic Media journal November 2018
Molecular titanium nitrides: nucleophiles unleashed journal January 2017
Dual-Functional N Dopants in Edges and Basal Plane of MoS 2 Nanosheets Toward Efficient and Durable Hydrogen Evolution journal December 2016
Transition-metal-oxide-based catalysts for the oxygen reduction reaction journal January 2018
Influence of 3d transition-metal substitution on the oxygen reduction reaction electrocatalysis of ternary nitrides in acid journal June 2019
The Electrocatalytic Stability Investigation of a Proton Manager MOF for the Oxygen Reduction Reaction in Acidic Media text January 2021
Defect Engineering of Molybdenum-Based Materials for Electrocatalysis journal November 2020