Effectively reducing reagent concentrations for electrochemical reactions in aqueous solutions using plasmon-activated water

Chih Ping Yang, Sheng Uei Fang, Kuang Hsuan Yang, Hui Yen Tsai, Yu Chuan Liu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Most of chemical reactions are performed in aqueous solutions, which are conventionally prepared using laboratory-ready and environmentally friendly deionized (DI) water. Water is generally considered as a passive reactant or as a spectator solvent. In this work, we demonstrate the added reagents for reactions in aqueous solutions can be effectively reduced by utilizing plasmon-activated water (PAW) with reduced hydrogen-bonded (HB) structure instead of conventional DI water with strong HB structure. For electrochemical reactions performing the similar currents the electrolytes used in PAW-based systems are ca. 90% concentrations compared to those used in DI water-based systems. Moreover, these concentrations used in PAW in situ-based systems can be further reduced to ca. 80% of magnitudes for maintaining the similar current levels. More interestingly, the recorded current of oxygen evolution reaction (OER) on a catalytic Pt electrode in the PAW-based system (0.09 M KOH) is significantly higher than that in the DI water-based system (0.1 M KOH). That means that the efficiency of the OER performed in a low-electrolyte-concentration alkaline solution can be markedly enhanced by utilizing PAW in spite of the electrolyte concentration is reduced by 10% of magnitude compared to the DI water-based system. These interesting findings promise the PAW for the effective and green reactants and solvents.

Original languageEnglish
Pages (from-to)44-50
Number of pages7
JournalJournal of Electroanalytical Chemistry
Volume818
DOIs
Publication statusPublished - Jun 1 2018

Keywords

  • Concentration
  • Electrochemical reactions
  • Green chemistry
  • In situ
  • Plasmon-activated water

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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