Mixed Close-Packed Cobalt Molybdenum Nitrides as Non-noble Metal Electrocatalysts for the Hydrogen Evolution Reaction.
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 at −0.20...
| Publicado en: | Journal of the American Chemical Society Vol. 135; no. 51; pp. 19186 - 19193 |
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| Autores principales: | , , , , |
| Formato: | Artículo |
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American Chemical Society
12/25/2013
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=93733832&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 93733832 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 12/25/2013 vid: 135 iid: 51 pid: 997 pub: American Chemical Society artinfo: ui: 93733832 10.1021/ja4081056 ppf: 19186 ppct: 7 formats: tig: atl: Mixed Close-Packed Cobalt Molybdenum Nitrides as Non-noble Metal Electrocatalysts for the Hydrogen Evolution Reaction. aug: au: Bingfei Cao Veith, Gabriel M. Neuefeind, Joerg C. Adzic, Radoslav R. Khalifah, Peter G. affil: Chemistry Department, Stony Brook University, Stony Brook, New York 11794, United States Chemistry Department, Brookhaven National Laboratory, Upton, New York 11793, United States Material Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States su: Chromium group Optical diffraction Particles (Nuclear physics) Neutron diffraction Molecular orbitals Solid state chemistry Transition metals sug: subj: Chromium group Optical diffraction Particles (Nuclear physics) Neutron diffraction Molecular orbitals Solid state chemistry Transition metals ab: 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 at −0.20 V vs RHE at low catalyst loadings of 0.24 mg/cm in rotating disk experiments under a H 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 P6/mmc with lattice parameters of a = 2.85176(2) Å and c = 10.9862(3) Å and a formula of CoMoN. 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. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2013 holdings: @attributes: islocal: N |
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