articleJournal of the American Chemical SocietyApr 16, 2014GREEN OA

Nickel–Iron Oxyhydroxide Oxygen-Evolution Electrocatalysts: The Role of Intentional and Incidental Iron Incorporation

LTLena TrotochaudSLSamantha L. YoungJKJames K. RanneySWShannon W. Boettcher

University of Oregon

PubMed
Indexed incrossrefpubmed

Abstract

Fe plays a critical, but not yet understood, role in enhancing the activity of the Ni-based oxygen evolution reaction (OER) electrocatalysts. We report electrochemical, in situ electrical, photoelectron spectroscopy, and X-ray diffraction measurements on Ni(1-x)Fe(x)(OH)2/Ni(1-x)Fe(x)OOH thin films to investigate the changes in electronic properties, OER activity, and structure as a result of Fe inclusion. We developed a simple method for purification of KOH electrolyte that uses precipitated bulk Ni(OH)2 to absorb Fe impurities. Cyclic voltammetry on rigorously Fe-free Ni(OH)2/NiOOH reveals new Ni redox features and no significant OER current until >400 mV overpotential, different from previous reports which…

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Topics & keywords

Topics
Keywords
  • Chemistry
  • Nickel
  • Oxygen evolution
  • Oxygen
  • Inorganic chemistry
  • Metallurgy
  • Electrochemistry
  • Organic chemistry
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