Stability evaluation of earth-abundant metal-based polyoxometalate electrocatalysts for oxygen evolution reaction towards industrial PEM electrolysis at high current densities

Kim Marie Vetter, Camila Aring da Silva Ramos Mauro, David Reinisch, Thomas Reichbauer, Nemanja Martić, Christian Jandl, Olaf Hinrichsen, Günter Schmid

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We investigated the cobalt polyoxometalate catalyst Ba8[Co9(H2O)6(OH)3(HPO4)2(PW9O34)3] in oxygen evolution reaction for large-scale water electrolysis. The catalyst was characterized, yielding BET surfaces (8.37 m2/g), crystal water content (8.38%, 44 H2O), elemental analyses and single crystal structures (space group P1̅, a = 19.901(4) Å, b = 21.177(4) Å, c = 24.036(5) Å, α = 92.689(7)°, β = 108.73(7)°, γ = 117.137(6)°, Co9Na16O196.05P5W27, V = 8310(3) Å2 with z = 2; R2final = 0.001). The catalyst was integrated in an industrially applicable membrane electrode assembly and electrochemically characterized. Polarization studies revealed catalyst dissolution in situ, visible as a current density peak (32.2 mA/cm2, 2.2 V) with subsequent collapse (<5 mA/cm2). Galvanostatic experiments showed voltage increase from 2.5 to > 10 V at 10 mA/cm2 tracing back to acid-mediated decomposition of the anionic POM oxide framework. We deduced insufficient thermodynamic as well as kinetic stability for industrial requirements in PEM water electrolysis.

Original languageEnglish
Article numbere202100073
JournalElectrochemical Science Advances
Volume2
Issue number3
DOIs
StatePublished - Jun 2022

Keywords

  • electrochemistry
  • industrial current densities
  • membrane electrode assembly
  • polyoxometalates
  • stability evaluation

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