Evaluation of the boiling effect on oxygen evolution reaction using a three-electrode cell
Evaluation of the boiling effect on oxygen evolution reaction using a three-electrode cell
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使用三电极电池评估沸腾对析氧反应的影响
DOI：
10.1016/j.ijhydene.2022.06.010
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发表时间：
2022
影响因子：
7.2
通讯作者：
K
中科院分区：
文献类型：
--
作者：
Li;L.;Karimata;T.;Hayashi;A.;& Ito;K
聚合物电解质膜水电解槽（PEMWE）的高昂初始成本延迟了其广泛商业化。降低成本的一种可能的方法是通过降低过电压和增加电流密度来减少电极面积。这项研究提出了一种新方法，将沸腾叠加在析氧反应（OER）上以降低电解电压。沸腾形成的气泡预计会降低浓度过电压。使用三电极电池对沸腾效应进行了实验分析。虽然一般的催化剂层（CL）形成在工作电极（WE）棒上，但工作电极（WE）棒的结构很特殊，其中嵌入了10W加热器并在1巴条件下在电极上沸腾。在静态 OER 电流密度下提高电极温度会略微降低 OER 电势。然而，当温度超过沸腾温度时，观察到电势突然下降。此外，与实际的 PEMWE 类似，当在 CL 上组装多孔传输层 (PTL) 和流道时，这种突然下降会大大加剧。这些实验结果表明，沸腾可以通过降低 CL 上的氧浓度来降低浓度过电压，特别是当 PTL 引起的传质阻力相当大时。如本文所建议，创新且简单地利用沸腾可以增强氧气传输，并有助于降低 PEMWE 的初始成本。
The high initial cost of polymer electrolyte membrane water electrolyzers (PEMWEs) has delayed their widespread commercialization. A possible means to reduce cost is by reducing the overvoltage and increasing the current density to reduce the electrode area. This study proposes a novel method in which boiling is superimposed on the oxygen evolution reaction (OER) to decrease electrolysis voltage. The vapor bubbles formed by boiling are expected to decrease the concentration overvoltage. The boiling effect was experimentally analyzed using a three-electrode cell. Although a general catalyst layer (CL) was formed on a working electrode (WE) bar, the structure of the working electrode (WE) bar was special, in which a 10-W heater was embedded and made boiling on the electrode under 1 bar condition. Increasing the electrode temperature under static OER current density slightly decreased the OER potential. However, an abrupt decrease in potential was observed when the temperature was scaled over the boiling temperature. Moreover, this abrupt decrease substantially intensified when, similar to a practical PEMWE, a porous transfer layer (PTL) and flow channel were assembled on the CL. These experimental results suggest that boiling can reduce the concentration overvoltage by reducing the oxygen concentration on the CL, especially when the mass transport resistance caused by the PTL is considerable. Innovatively and simply utilizing boiling, as proposed here, can enhance the oxygen transfer and contribute to reducing the initial cost of PEMWEs.