Electrochemistry in bicontinuous microemulsions derived from two immiscible electrolyte solutions for a membrane-free redox flow battery,Journal of Colloid and Interface Science

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Electrochemistry in bicontinuous microemulsions derived from two immiscible electrolyte solutions for a membrane-free redox flow battery
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2023-03-15 , DOI: 10.1016/j.jcis.2023.03.060
Kodai Nakao ₁ , Koji Noda ₂ , Hinako Hashimoto ₂ , Mayuki Nakagawa ₂ , Taisei Nishimi ₃ , Akihiro Ohira ₄ , Yukari Sato ₄ , Dai Kato ₅ , Tomoyuki Kamata ₅ , Osamu Niwa ₆ , Masashi Kunitake ₇

Affiliation

Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan; Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan.
Japan Technological Research Association of Artificial Photosynthetic Chemical Process (ARPChem), Room 422, Bldg. 12, Faculty of Engineering, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan.
Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan.
Advanced Science Research Laboratory, Saitama Institute of Technology, 1690 Fusaiji, Fukaya, Saitama 369-0293, Japan.
Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan; Institute of Industrial Nanomaterials, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan.

Hypotheses

Bicontinuous microemulsions (BMEs) have attracted attention as unique heterogeneous mixture for electrochemistry. An interface between two immiscible electrolyte solutions (ITIES) is an electrochemical system that straddles the interface between a saline and an organic solvent with a lipophilic electrolyte. Although most BMEs have been reported with nonpolar oils, such as toluene and fatty acids, it should be possible to construct a sponge-like three-dimensionally expanded ITIES comprising a BME phase.

Experiments

Dichloromethane (DCM)–water microemulsions stabilized by a surfactant were investigated in terms of the concentrations of co-surfactants and hydrophilic/lipophilic salts. A Winsor III microemulsion three-layer system, consisting of an upper saline phase, a middle BME phase, and a lower DCM phase, was prepared, and electrochemistry was conducted in each phase.

Findings

We found the conditions for ITIES-BME phases. Regardless of where the three electrodes were placed in the macroscopically heterogeneous three-layer system, electrochemistry was possible, as in a homogeneous electrolyte solution. This indicates that the anodic and cathodic reactions can be divided into two immiscible solution phases. A redox flow battery comprising a three-layer system with a BME as the middle phase was demonstrated, paving the way for applications such as electrolysis synthesis and secondary batteries.

中文翻译：

用于无膜氧化还原液流电池的来自两种不混溶电解质溶液的双连续微乳液的电化学

假设

双连续微乳液 (BME) 作为用于电化学的独特多相混合物引起了人们的关注。两种不混溶的电解质溶液 (ITIES) 之间的界面是一种电化学系统，它横跨盐水和有机溶剂之间的界面，并带有亲脂性电解质。尽管大多数 BME 已被报道使用非极性油，如甲苯和脂肪酸，但应该可以构建包含 BME 相的海绵状三维扩展 ITIES。