Evaluation of energy consumption for effective seawater electrolysis based on the electrodes and salinity

Youmi Jung, Yeojoon Yoon, Minhwan Kwon, Sungcheoul Roh, Tae Mun Hwang, Joon Wun Kang

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

This study recommended the effective condition in electrolysis of saline water considering the energy consumption. The experiments were performed using two types of electrodes, IrO2/Ti and Pt/Ti, under various salinity conditions (4, 8, 16, 32, and 46 PSU) and current density conditions (11, 33, 55, 111, and 222 mA/cm2). The electrolysis produced mainly bromine, which was measured as a total residual oxidant (TRO). Seawater electrolysis produced TRO linearly with increasing the run time and current density. Below 32 PSU, the electrolysis using the IrO2/Ti electrode produced the TRO greater than that using the Pt/Ti electrode. The TRO formation rate of the IrO2/Ti electrode increased following a half parabola pattern in terms of salinity, while that of the Pt/Ti electrode increased until 32 PSU, and then it decreased to 46 PSU. The measured electric power of both electrodes showed the same graph tendency with a parabolic curve as a quadratic equation. The energy consumption of the IrO2/Ti and Pt/Ti electrodes showed a quite different tendency. Considering the energy consumption as well as the required time for TRO formation, the same range of current density (30–50 mA/cm2) is recommended for the two electrodes, IrO2/Ti and Pt/Ti electrodes, even in a different tendency of energy consumption.

Original languageEnglish
Pages (from-to)10136-10145
Number of pages10
JournalDesalination and Water Treatment
Volume57
Issue number22
DOIs
Publication statusPublished - 2016 May 8

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Ocean Engineering
  • Pollution

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