Abstract
AbstractIonic liquids (ILs) are considered as a new‐generation electrolyte for electrochemical devices such as fuel cells. When in contact with water, ILs can form a liquid|liquid interface due to their hydrophobicity. This feature allows us to build a conceptual membraneless device for energy generation by combining the oxygen reduction and hydrogen oxidation reactions in acid aqueous electrolyte and in [Bmim][PF6], respectively. The IL|water interface serves as an ion‐exchange interface, allowing the proton transfer between the phases. The open circuit voltage (OCV) between the two half‐cells achieves 1.34 V with a maximum power density of 0.7 μW cm−2 at room temperature. Changes in the pH show no influence in the Galvani potential difference resulted from the IL|water interface and in the half‐cell. Besides the relative low fuel cell power, the conceptual device has wide margin to improve, mainly in the cell design.
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