Efficacy of potassium poly(acrylate) gel electrolyte as a substitute to aqueous electrolytes for alkaline ammonia electrolysis

Ramasamy Palaniappan, Gerardine G. Botte

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

An alkaline polymer gel electrolyte was synthesized using potassium salt of cross-linked polyacrylic acid (PAA-K) and tested for its efficacy as an alternative to aqueous potassium hydroxide for ammonia electrolysis. Upon using PAA-K, the onset potential for the anodic ammonia electro-oxidation reaction increased, while that for the hydrogen evolution reaction decreased. This resulted in a larger operating potential window for ammonia electrolysis while simultaneously improving the efficiency of hydrogen production. The conversion of ammonia improved from 15.882 ± 0.002% to 25.000 ± 0.004%, while the current efficiency for the consumption of ammonia increased from 92 ± 1% to 97 ± 2% by using PAA-K. The use of PAA-K also prevented the crossover of the hydrogen produced to the anode side, unlike aqueous KOH.

Original languageEnglish
Pages (from-to)772-781
Number of pages10
JournalElectrochimica Acta
Volume88
DOIs
StatePublished - Jan 15 2013

Keywords

  • Alkaline electrolytes
  • Ammonia electrolysis
  • Gel electrolytes
  • Hydrogen production
  • Polyacrylic acid

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