Solid-State Hydroxide Ion Conductivity in Silver(I) Oxide, Ag<sub>2</sub>O

Silver(I) oxide, Ag2O, precipitated as microcrystals by combining aqueous silver(I) nitrate and KOH solutions, was found to be a solid-state hydroxide ion conductor with ionic conductivity on the order of 10-3 S/cm. The proton chemical shifts at 4.87 and −7.35 ppm measured by solid-state 1H NMR experiments are attributed to water molecules and in-lattice OH- coordinated to silver, respectively. The lack of spinning sidebands around the 4.87 ppm peak indicates rapid reorientation on the NMR time scale, suggesting that the water molecules are adsorbed to the surface of the Ag2O crystals. Pulsed field gradient measurements gave similar diffusion coefficients (2 × 10-7 cm2/s at 298 K) for all three proton environments, indicating chemical exchange between sites on the millisecond time scale. The activation energy for OH- diffusion measured by NMR (0.18 eV) was comparable to that obtained by conductivity measurements and density functional theory (DFT) electronic structure calculations. The calculated Pourbaix diagram of Ag2O is consistent with the slightly lower sample density observed in He pycnometry and thermogravimetric measurements.

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Work Title Solid-State Hydroxide Ion Conductivity in Silver(I) Oxide, Ag<sub>2</sub>O
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Open Access
Creators
  1. Leanna Schulte
  2. Shihan Qin
  3. Wonil Jung
  4. Christy George
  5. Jarrett D. Dillenburger
  6. Akshay Venkatesh
  7. Muhammad K. Ishak
  8. Nichole M. Wonderling
  9. Sariah Marth
  10. Heemin Park
  11. Chulsung Bae
  12. Andrew M. Rappe
  13. Thomas E. Mallouk
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Chemistry of Materials
Publication Date December 10, 2024
Publisher Identifier (DOI)
  1. https://doi.org/10.1021/acs.chemmater.4c02082
Deposited January 28, 2025

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Version 1
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  • Created
  • Added Chemistry_of_Materials.pdf
  • Added cm4c02082_si_001.pdf
  • Added Creator Leanna Schulte
  • Added Creator Shihan Qin
  • Added Creator Wonil Jung
  • Added Creator Christy George
  • Added Creator Jarrett D. Dillenburger
  • Added Creator Akshay Venkatesh
  • Added Creator Muhammad K. Ishak
  • Added Creator Nichole M. Wonderling
  • Added Creator Sariah Marth
  • Added Creator Heemin Park
  • Added Creator Chulsung Bae
  • Added Creator Andrew M. Rappe
  • Added Creator Thomas E. Mallouk
  • Published
  • Updated