Seawater electrolysis at ultra-high current density: A comparative analysis of cylindrical versus conical electrodes

IF 8.3 2区工程技术 Q1 CHEMISTRY, PHYSICAL International Journal of Hydrogen Energy Pub Date : 2025-03-05 DOI:10.1016/j.ijhydene.2025.03.003

Søren A. Tornøe , John W. Koster , Andy V. Surin , Jacob H. Sands , Nobuhiko P. Kobayashi

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Abstract

Seawater electrolysis preferentially leans towards Chlorine Evolution Reaction (CER) over Oxygen Evolution Reactions (OER) under conventional conditions, but OER becomes more dominant at sufficiently higher current densities. In this study, we evaluated the effector of cylindrical and conical electrode geometries on CER and hydrogen production at high current density (i.e., >1 A cm⁻²). We found the point of lowest CER within a voltage range of 40 V–90 V. Conical electrodes, optimized to reduce CER, produced a magnitude less chloride (502 ppb) than cylindrical electrodes (1485 ppb) at nearly double the current density (∼12 and ∼6 A cm⁻² respectively). However, this reduction in CER with conical electrodes was accompanied by a 25% decrease in hydrogen production. In addition, both cylindrical and conical electrodes were able to heat 500 ml of seawater by approximately 6–7 °C over a 2-min period with cylindrical electrodes heating slightly less than conical electrodes.

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超高电流密度下的海水电解：圆柱形与锥形电极的比较分析

在常规条件下，海水电解更倾向于氯析反应（CER）而不是氧析反应（OER），但在足够高的电流密度下，OER更占优势。在这项研究中，我们评估了圆柱形和锥形电极几何形状对高电流密度（即>；1 A cm−2）下CER和氢气产量的影响。我们在40 V - 90 V的电压范围内发现了最低的CER点。锥形电极，优化以降低CER，在电流密度（分别为~ 12和~ 6 a cm - 2）几乎翻倍的情况下，产生的氯化物（502 ppb）比圆柱形电极（1485 ppb）少。然而，锥形电极的CER降低伴随着25%的氢气产量下降。此外，圆柱形电极和锥形电极都能在2分钟内加热500毫升海水，温度约为6-7°C，圆柱形电极的加热温度略低于锥形电极。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.