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Performance of polyethylene based radiation grafted anion exchange membrane with polystyrene-b-poly (ethylene/butylene)-b-polystyrene based ionomer using NiCo2O4 catalyst for water electrolysis

Lookup NU author(s): Dr Gaurav Gupta, Professor Keith Scott, Dr Mohamed Mamlouk

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

A soluble anion exchange ionomer with high OH− ion conductivity comparable to that of H+ conductivity ofNafion is synthesised by chloromethylation of polystyrene-b-poly (ethylene/butylene)-b-polystyrene (SEBS)and used with NiCo2O4 electro-catalyst for water electrolysis. The ionomer has an ion exchange capacity of1.9 mmol g−1 and ionic conductivity of 0.14 S cm−2 at 50 °C. The cell voltage at 20 °C at 100 mA cm−2 is1.77 and 1.72 V in, 0.1 and 1.0 M NaOH, respectively, for an optimum loading of 10 mg cm−2 NiCo2O4. At10 mg cm−2 NiCo2O4 electrolyser cell performance is at least equal to or superior to that of IrO2 at 2 mg cm−2with excellent stability over 1 h. When the catalyst is sprayed on the GDL instead of CCM, the performanceis further improved to 1.65 V at 100 mA cm−2 at 60 °C & 0.1 M KOH. The limited AEM electrolyser performancewhen operating with deionised water in comparison to PEM and alkaline electrolyser arises from thesluggish OER in the AEM environment equivalent to pH of 11.5 and the two orders of magnitude lower HERactivity with respect to acid medium combined with the high Tafel slope of 120 mV dec−1.


Publication metadata

Author(s): Gupta G, Scott K, Mamlouk M

Publication type: Article

Publication status: Published

Journal: Journal of Power Sources

Year: 2017

Volume: 375

Pages: 387-396

Print publication date: 31/01/2018

Online publication date: 12/07/2017

Acceptance date: 05/07/2017

Date deposited: 25/07/2017

ISSN (print): 0378-7753

ISSN (electronic): 1873-2755

Publisher: Elsevier

URL: https://doi.org/10.1016/j.jpowsour.2017.07.026

DOI: 10.1016/j.jpowsour.2017.07.026

Data Source Location: http://dx.doi.org/10.17634/138124-2


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