TY - JOUR
T1 - Stability evaluation of earth-abundant metal-based polyoxometalate electrocatalysts for oxygen evolution reaction towards industrial PEM electrolysis at high current densities
AU - Vetter, Kim Marie
AU - Aring da Silva Ramos Mauro, Camila
AU - Reinisch, David
AU - Reichbauer, Thomas
AU - Martić, Nemanja
AU - Jandl, Christian
AU - Hinrichsen, Olaf
AU - Schmid, Günter
N1 - Publisher Copyright:
© 2021 The Authors. Electrochemical Science Advances published by Wiley-VCH GmbH.
PY - 2022/6
Y1 - 2022/6
N2 - 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.
AB - 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.
KW - electrochemistry
KW - industrial current densities
KW - membrane electrode assembly
KW - polyoxometalates
KW - stability evaluation
UR - http://www.scopus.com/inward/record.url?scp=85122631203&partnerID=8YFLogxK
U2 - 10.1002/elsa.202100073
DO - 10.1002/elsa.202100073
M3 - Article
AN - SCOPUS:85122631203
SN - 2698-5977
VL - 2
JO - Electrochemical Science Advances
JF - Electrochemical Science Advances
IS - 3
M1 - e202100073
ER -