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Issue 10, 2017
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Towards a stable ion-solvating polymer electrolyte for advanced alkaline water electrolysis

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Abstract

Advanced alkaline water electrolysis using ion-solvating polymer membranes as electrolytes represents a new direction in the field of electrochemical hydrogen production. Polybenzimidazole membranes equilibrated in aqueous KOH combine the mechanical robustness and gas-tightness of a polymer with the conductive properties of an aqueous alkaline salt solution, and are thus of particular interest in this field of research. This work presents a comprehensive study of ternary alkaline polymer electrolyte systems developed around a polybenzimidazole derivative that is structurally tailored towards improved stability in alkaline environments. The novel electrolytes are extensively characterized with respect to physicochemical and electrochemical properties and the chemical stability is assessed in 0–50 wt% aqueous KOH for more than 6 months at 88 °C. In water electrolysis tests using porous 3-dimensional electrodes completely free from noble metals, they show polarization characteristics comparable to those of commercially available separators and good performance stability over several days.

Graphical abstract: Towards a stable ion-solvating polymer electrolyte for advanced alkaline water electrolysis

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Publication details

The article was received on 12 Dec 2016, accepted on 02 Feb 2017 and first published on 21 Feb 2017


Article type: Paper
DOI: 10.1039/C6TA10680C
Citation: J. Mater. Chem. A, 2017,5, 5055-5066
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    Towards a stable ion-solvating polymer electrolyte for advanced alkaline water electrolysis

    D. Aili, A. G. Wright, M. R. Kraglund, K. Jankova, S. Holdcroft and J. O. Jensen, J. Mater. Chem. A, 2017, 5, 5055
    DOI: 10.1039/C6TA10680C

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