电渗透流与碱水电解的极限电流

IF 5.4 Q2 CHEMISTRY, PHYSICAL Journal of Power Sources Advances Pub Date : 2020-12-01 DOI:10.1016/j.powera.2020.100034
J.W. Haverkort, H. Rajaei
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引用次数: 14

摘要

在碱性条件下,氢氧化物离子会在用于制氢的水电解槽的阳极耗尽,导致电流密度受限。我们通过实验发现,在微孔分离器中,从阳极到阴极的电渗透流动降低了该极限电流密度。利用能斯特-普朗克方程,导出了在扩散、迁移和平流存在下的势降的有用表达式。采用准平稳的一维模型成功地描述了瞬态动力学。电渗透流驱动的溶解氧交叉影响了氢的纯度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Electro-osmotic flow and the limiting current in alkaline water electrolysis

Under alkaline conditions, hydroxide ions can deplete at the anode of a water electrolyser for hydrogen production, resulting in a limiting current density. We found experimentally that in a micro-porous separator, an electro-osmotic flow from anode to cathode lowers this limiting current density. Using the Nernst-Planck equation, a useful expression for the potential drop in the presence of diffusion, migration, and advection is derived. A quasi-stationary, one-dimensional model is used to successfully describe the transient dynamics. Electro-osmotic flow-driven cross-over of dissolved oxygen is argued to impact the hydrogen purity.

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来源期刊
CiteScore
9.10
自引率
0.00%
发文量
18
审稿时长
64 days
期刊最新文献
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