Title: Electrochemically induced metal- vs. ligand-based redox changes in mackinawite: identification of a Fe3+- and polysulfide-containing intermediate

Journal Article · · Dalton Transactions
DOI: https://doi.org/10.1039/d1dt01684a · OSTI ID:1819715
ORCiD logo [1]; ORCiD logo [2];  [3];  [4];  [5];  [6]; ORCiD logo [7];  [1]; ORCiD logo [8]
  1. Tokyo Institute of Technology (Japan). Earth Life Science Institute, and School of Materials and Chemical Technology
  2. Montana State Univ., Bozeman, MT (United States)
  3. Tokyo Institute of Technology (Japan). Earth Life Science Institute
  4. Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka (Japan). Institute for Extra-cutting edge Science and Technology Avant-garde Research (X-star)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  6. Tokushima University, Minami-Jyosanjima, Tokushima (Japan). Institute of Post-LED Photonics
  7. Tokyo Institute of Technology (Japan). Earth Life Science Institute; Inst. of Physical and Chemical Research (RIKEN), Wako (Japan). Center for Sustainable Resource Science
  8. Tokyo Institute of Technology (Japan). Earth Life Science Institute; Inst. of Physical and Chemical Research (RIKEN), Wako (Japan). Center for Sustainable Resource Science; Blue Marble Space Institute of Science, Seattle, WA (United States)

Under anaerobic conditions, ferrous iron reacts with sulfide producing FeS, which can then undergo a temperature, redox potential, and pH dependent maturation process resulting in the formation of oxidized mineral phases, such as greigite or pyrite. A greater understanding of this maturation process holds promise for the development of iron-sulfide catalysts, which are known to promote diverse chemical reactions, such as H+, CO2 and NO3- reduction processes. Hampering the full realization of the catalytic potential of FeS, however, is an incomplete knowledge of the molecular and redox processess ocurring between mineral and nanoparticulate phases. Here, we investigated the chemical properties of iron-sulfide by cyclic voltammetry, Raman and X-ray absorption spectroscopic techniques. Tracing oxidative maturation pathways by varying electrode potential, nanoparticulate n(Fe2+S2-)(s) was found to oxidize to a Fe3+ containing FeS phase at -0.5 V vs. Ag/AgCl (pH = 7). In a subsequent oxidation, polysulfides are proposed to give a material that is composed of Fe2+, Fe3+, S2- and polysulfide (Sn2-) species, with its composition described as Fe2+1-3xFe3+2xS2-1-y(Sn2-)y. Thermodynamic properties of model compounds calculated by density functional theory indicate that ligand oxidation occurs in conjunction with structural rearrangements, whereas metal oxidation may occur prior to structural rearrangement. These findings together point to the existence of a metastable FeS phase located at the junction of a metal-based oxidation path between FeS and greigite (Fe2+Fe3+2S2-4) and a ligand-based oxidation path between FeS and pyrite (Fe2+(S2)2-).

Research Organization:
Montana State Univ., Bozeman, MT (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515; SC0020246
OSTI ID:
1819715
Journal Information:
Dalton Transactions, Journal Name: Dalton Transactions Journal Issue: 34 Vol. 50; ISSN 1477-9226
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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