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Cobalt-iron (oxy)hydroxide oxygen evolution electrocatalysts: the role of structure and composition on activity, stability, and mechanism

Burke, Michaela S ; Kast, Matthew G ; Trotochaud, Lena ; Smith, Adam M ; Boettcher, Shannon W

Journal of the American Chemical Society, 18 March 2015, Vol.137(10), pp.3638-48 [Rivista Peer Reviewed]

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  • Titolo:
    Cobalt-iron (oxy)hydroxide oxygen evolution electrocatalysts: the role of structure and composition on activity, stability, and mechanism
  • Autore: Burke, Michaela S ; Kast, Matthew G ; Trotochaud, Lena ; Smith, Adam M ; Boettcher, Shannon W
  • Note di contenuto: Cobalt oxides and (oxy)hydroxides have been widely studied as electrocatalysts for the oxygen evolution reaction (OER). For related Ni-based materials, the addition of Fe dramatically enhances OER activity. The role of Fe in Co-based materials is not well-documented. We show that the intrinsic OER activity of Co(1-x)Fe(x)(OOH) is ∼100-fold higher for x ≈ 0.6-0.7 than for x = 0 on a per-metal turnover frequency basis. Fe-free CoOOH absorbs Fe from electrolyte impurities if the electrolyte is not rigorously purified. Fe incorporation and increased activity correlate with an anodic shift in the nominally Co(2+/3+) redox wave, indicating strong electronic interactions between the two elements and likely substitutional doping of Fe for Co. In situ electrical measurements show that Co(1-x)Fe(x)(OOH) is conductive under OER conditions (∼0.7-4 mS cm(-1) at ∼300 mV overpotential), but that FeOOH is an insulator with measurable conductivity (2.2 × 10(-2) mS cm(-1)) only at high overpotentials >400...
  • Fa parte di: Journal of the American Chemical Society, 18 March 2015, Vol.137(10), pp.3638-48
  • Soggetti: Chemistry
  • Lingua: Inglese
  • Tipo: Articolo
  • Identificativo: E-ISSN: 1520-5126 ; PMID: 25700234 Version:1 ; DOI: 10.1021/jacs.5b00281

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