Existence of Dissolved Oxygen near Anode Catalyst in Proton Exchange Membrane Water Electrolyzers
Existence of Dissolved Oxygen near Anode Catalyst in Proton Exchange Membrane Water Electrolyzers
复制标题
质子交换膜水电解槽阳极催化剂附近溶解氧的存在
DOI：
10.1149/1945-7111/ac6392
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发表时间：
2022
影响因子：
3.9
通讯作者：
Shigenori Mitsushima
中科院分区：
文献类型：
--
作者：
Konosuke Watanabe;Kohei Wakuda;Kodai Wani;Takuto Araki;Kensaku Nagasawa;Shigenori Mitsushima
质子交换膜水电解槽阳极传质损失是扩大其实际应用范围的关键问题之一。然而，关于阳极催化剂层（CL）内部和附近的氧输送的报道很少。虽然特别是在阳极CL附近，有两种传输机制：气态氧和溶解氧，但据我们所知，还没有报道通过实验研究PEMWE中溶解氧的存在。在此，使用高速照相机观察阳极催化剂附近的气泡生长行为，并研究气泡半径的变化。气泡的半径在离开阳极催化剂层表面后继续增大，确认了溶解氧的存在和氧过饱和区域的形成。溶解氧的存在是今后评价PEMWE阳极传质损失的一个重要因素，也为今后开发阳极多孔结构以降低阳极传质损失提供了很好的启示。
The anode mass transport loss is one of the issues to expand the practical application scope of proton exchange membrane water electrolyzers (PEMWEs). However, there are few reports concerning the oxygen transport inside and near the anode catalyst layer (CL). Although especially near the anode CL, there are two transport mechanisms: gaseous oxygen and dissolved oxygen, there are no reports, as far as we could find, that experimentally examined the existence of dissolved oxygen in PEMWE. Herein, the bubble growth behavior near the anode catalyst was observed using a high-speed camera, and the bubble radius change was investigated. The radii of the bubbles continued to increase after they left the anode catalyst layer surface, and the existence of dissolved oxygen and the formation of an oxygen supersaturated region were confirmed. The existence of dissolved oxygen is an important factor in the future evaluation of anode mass transport loss in PEMWE and a good revelation for the future development of the anode porous structure to reduce the anode mass transport loss.