Increasing electrochemical reaction rates using treated water with reduced hydrogen bonds

Chih Ping Yang, Chien Tai Hong, Fu Der Mai, Hui Yen Tsai, Yu Chuan Liu

Research output: Contribution to journalArticle

Abstract

Plasmon-activated water (PAW) with reduced hydrogen-bonded (HB) structure is created from conventional deionized (DI) water. Compared to DI water, PAW owns distinctly higher diffusion coefficient and electron transfer rate constant for electrochemical reactions. In this work, we discuss the more efficient oxygen (or hydrogen) evolution reaction (OER or HER) performed in PAW solutions, as compared to DI water solutions, in different concentrations of electrolytes at different applied potentials. Basically, the higher recorded currents based on PAW solutions are more significant when experiments are performed in lower concentrations of electrolytes and at lower applied overpotentials. Interestingly, the increased current density in percentage for OERs and HERs performed in PAW solutions compared to experiments performed in DI water solutions is less significant as the applied overpotential is increased. These interesting findings suggest that utilizing PAW with higher diffusion coefficient and electron transfer rate constant for more efficient electrochemical reactions is suitable in well diffusion- and kinetics-controlled systems. Also, in the Randles-Sevcik reaction, using the PAW solution takes more advantages in a lower concentration of K 3 Fe(CN) 6 at a lower scan rate. This innovative concept has emerged as a promising strategy for effectively utilizing PAW in electrochemical reactions.

Original languageEnglish
Pages (from-to)116-122
Number of pages7
JournalJournal of Electroanalytical Chemistry
Volume839
DOIs
Publication statusPublished - Apr 15 2019

Keywords

  • Diffusion
  • Electrochemistry
  • Hydrogen bonds
  • Kinetics
  • Treated water

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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