Low-Temperature Fuel Cell and Method for Operating the Same

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This invention describes a new type of low-temperature fuel cell, specifically a direct methanol fuel cell, which includes an additional auxiliary electrode placed between the anode and the cathode. This electrode is designed to improve the conversion of methanol and deal with byproducts more efficiently, thanks to a unique flowfield and catalytic process that partially oxidizes methanol up to formic acid. The auxiliary electrode helps further convert formic acid and enables efficient removal of generated gases.

Use CasesContent extracted from patent full text and abstract with AI.

• Portable electronic devices requiring efficient, compact energy sources
• Transportation applications, such as powering electric vehicles
• Backup power systems for remote or emergency use
• Renewable or alternative energy systems integrating fuel cells
• Wearable electronics needing lightweight, high-energy density power supplies

BenefitsContent extracted from patent full text and abstract with AI.

• Increases the efficiency of methanol fuel cells at low temperatures
• Reduces unwanted methanol crossover effects, improving overall performance
• Enables better management and conversion of byproducts such as formic acid and carbon dioxide
• Can lead to longer-lasting and more reliable fuel cell systems
• Improves the practicality and safety of direct methanol fuel cells for various applications

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Patent Abstract

The invention relates to a fuel cell, in particular a direct methanol fuel cell, comprising an anode, a cathode, and an ion-conducting membrane arranged between these as an electrolyte. Additionally, the fuel cell has a further auxiliary electrode which is arranged between the anode and the cathode and is electrically connected to the cathode via a resistor. According to the invention, this additional electrode has, on the side facing the anode, a flow field which enables direct contact between the ion-conducting phase of the electrolyte and the auxiliary electrode. In an advantageous embodiment, the anode additionally has a catalyst which forces the methanol oxidation only up to formic acid. The additional auxiliary electrode is intended not only to convert the methanol flow taking place through the membrane into an effective proton and electron flow, but additionally to oxidize the formic acid formed at the anode, which likewise diffuses through the electrolyte to the additional electrode. The gaseous CO2 formed during oxidation there can advantageously be removed through the flow field.