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Cao B, Veith GM, Neuefeind JC, et al. Mixed close-packed cobalt molybdenum nitrides as non-noble metal electrocatalysts for the hydrogen evolution reaction. J Am Chem Soc. 2013;135(51):19186-92doi: 10.1021/ja4081056.
Cao, B., Veith, G. M., Neuefeind, J. C., Adzic, R. R., & Khalifah, P. G. (2013). Mixed close-packed cobalt molybdenum nitrides as non-noble metal electrocatalysts for the hydrogen evolution reaction. Journal of the American Chemical Society, 135(51), 19186-92. https://doi.org/10.1021/ja4081056
Cao, Bingfei, et al. "Mixed close-packed cobalt molybdenum nitrides as non-noble metal electrocatalysts for the hydrogen evolution reaction." Journal of the American Chemical Society vol. 135,51 (2013): 19186-92. doi: https://doi.org/10.1021/ja4081056
Cao B, Veith GM, Neuefeind JC, Adzic RR, Khalifah PG. Mixed close-packed cobalt molybdenum nitrides as non-noble metal electrocatalysts for the hydrogen evolution reaction. J Am Chem Soc. 2013 Dec 26;135(51):19186-92. doi: 10.1021/ja4081056. Epub 2013 Dec 11. PMID: 24175858.
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J Am Chem Soc. 2013 Dec 26;135(51):19186-92. doi: 10.1021/ja4081056. Epub 2013 Dec 11.

Mixed close-packed cobalt molybdenum nitrides as non-noble metal electrocatalysts for the hydrogen evolution reaction.

Journal of the American Chemical Society

Bingfei Cao, Gabriel M Veith, Joerg C Neuefeind, Radoslav R Adzic, Peter G Khalifah

Affiliations

  1. Chemistry Department, Stony Brook University , Stony Brook, New York 11794, United States.

PMID: 24175858 DOI: 10.1021/ja4081056

Abstract

A two-step solid-state reaction for preparing cobalt molybdenum nitride with a nanoscale morphology has been used to produce a highly active and stable electrocatalyst for the hydrogen evolution reaction (HER) under acidic conditions that achieves an iR-corrected current density of 10 mA cm(-2) at -0.20 V vs RHE at low catalyst loadings of 0.24 mg/cm(2) in rotating disk experiments under a H2 atmosphere. Neutron powder diffraction and pair distribution function (PDF) studies have been used to overcome the insensitivity of X-ray diffraction data to different transition-metal nitride structural polytypes and show that this cobalt molybdenum nitride crystallizes in space group P63/mmc with lattice parameters of a = 2.85176(2) Å and c = 10.9862(3) Å and a formula of Co0.6Mo1.4N2. This space group results from the four-layered stacking sequence of a mixed close-packed structure with alternating layers of transition metals in octahedral and trigonal prismatic coordination and is a structure type for which HER activity has not previously been reported. Based on the accurate bond distances obtained from time-of-flight neutron diffraction data, it is determined that the octahedral sites contain a mixture of divalent Co and trivalent Mo, while the trigonal prismatic sites contain Mo in a higher oxidation state. X-ray photoelectron spectroscopy (XPS) studies confirm that at the sample surface nitrogen is present and N-H moieties are abundant.

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