Sequential Generation of Hydrogen and Oxygen By Water Electrolysis Using Iodine Redox

作者：A. Kai, Mai Tomisaki, Hiroshige Matsumoto · 发表于：ECS Meeting Abstracts · 年份：2024 · DOI：10.1149/ma2024-02493517mtgabs · 被引用次数：1

Introduction In a hydrogen-centric society, hydrogen production via water electrolysis plays a crucial role1. Conventional water electrolysis generates hydrogen and oxygen simultaneously, necessitating a separation mechanism to prevent purity reduction and explosion risks induced by gas mixing. This study aims to selectively generate hydrogen and oxygen sequentially in two steps by utilizing the redox reaction between iodide and iodate ions. Specifically, exploiting the lower oxidation potential of iodide ions compared to the oxygen evolution potential, hydrogen is generated during the first step alongside the oxidation of iodide ions. Utilizing the lower reduction potential of iodate ions compared to the hydrogen evolution potential, oxygen is generated during the second step alongside the reduction of iodate ions. This presentation reports the results of investigating the feasibility of generating hydrogen and oxygen based on this principle. Experimental A two-compartment cell separated by a Nafion membrane was employed as the electrolysis cell. Platinum electrodes were used as the working and counter electrodes, and Ag/AgCl served as the reference electrode. Potentials were expressed relative to the reversible hydrogen electrode (RHE) which was converted from the measured potential (vs. Ag/AgCl) by the following equation: E RHE = E Ag/AgCl + 0.198 + 0.059 pH (V)2. Linear sweep voltammetry (LSV) measurements were conducted at each step to observe the current-pote...