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Optimization of anion exchange membrane water electrolyzers using ionomer-free electrodes

Author

Listed:
  • López-Fernández, E.
  • Gómez-Sacedón, C.
  • Gil-Rostra, J.
  • Espinós, J.P.
  • Brey, J. Javier
  • González-Elipe, A.R.
  • de Lucas-Consuegra, A.
  • Yubero, F.

Abstract

This work is carried out in the context of the anion exchange membrane water electrolysis (AEMWE) and pursuits to determine the influence of different cell components on the global electrochemical performance. Ionomer-free electrodes consisting of anodic Ni–Fe and cathodic Ni electrocatalysts deposited by magnetron sputtering in an oblique angle deposition configuration were utilized for this study. In addition to the characteristics and equivalent thickness of the electrocatalysts, other factors affecting the efficiency that have been considered in this study encompass the type of gas diffusion layer (GDLs), including carbon paper and stainless-steel fiber paper supports, and several commercial anion exchange membranes. The electrocatalytic performances in both a three-electrode and complete single cell AEMWE set-ups, together with the physico-chemical characterization of the electrodes before and after operation, have served to select the optimum components for the utilized cell configuration. Thus, current densities of 670 mA cm−2, at polarization voltage of 2.2 V, 1.0 M KOH electrolyte and 40 °C were obtained in a membrane electrode assembly. A seven days chronopotentiometry experiment at a fixed current of 400 mA cm−2 demonstrated a noticeable stability of this type of AEMWE cells incorporating ionomer-free electrodes.

Suggested Citation

  • López-Fernández, E. & Gómez-Sacedón, C. & Gil-Rostra, J. & Espinós, J.P. & Brey, J. Javier & González-Elipe, A.R. & de Lucas-Consuegra, A. & Yubero, F., 2022. "Optimization of anion exchange membrane water electrolyzers using ionomer-free electrodes," Renewable Energy, Elsevier, vol. 197(C), pages 1183-1191.
    • Handle: RePEc:eee:renene:v:197:y:2022:i:c:p:1183-1191
    DOI: 10.1016/j.renene.2022.08.013
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    1. Junqing Yan & Lingqiao Kong & Yujin Ji & Jai White & Youyong Li & Jing Zhang & Pengfei An & Shengzhong Liu & Shuit-Tong Lee & Tianyi Ma, 2019. "Single atom tungsten doped ultrathin α-Ni(OH)2 for enhanced electrocatalytic water oxidation," Nature Communications, Nature, vol. 10(1), pages 1-10, December.
    2. Vincent, Immanuel & Bessarabov, Dmitri, 2018. "Low cost hydrogen production by anion exchange membrane electrolysis: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P2), pages 1690-1704.
    3. Jakob Kibsgaard & Ib Chorkendorff, 2019. "Considerations for the scaling-up of water splitting catalysts," Nature Energy, Nature, vol. 4(6), pages 430-433, June.
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