Method for activation of fuel cell, particularly direct methanol fuel cell, involves operating fuel cell during galvanic operation for short time, fully or partially in electrolysis mode

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This patent describes a method for periodically activating fuel cells, specifically direct methanol fuel cells, by briefly switching parts or all of the cell from normal power-generating (galvanic) operation to an electrolysis mode during operation. This temporary switch involves applying an external electrolysis current, or manipulating the oxidant (e.g., air) flow, to locally trigger electrolysis, which reverses some degradation effects that occur during normal operation and improves fuel cell performance and longevity.

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

• Portable electronic devices powered by direct methanol fuel cells (DMFCs), such as laptops, smartphones, or military equipment.
• Stationary backup power supplies that use DMFC stacks for grid-independent energy.
• Automotive applications using methanol fuel cells for auxiliary power units or low-emission vehicles.
• Remote sensors or monitoring equipment powered by fuel cells in areas with limited access to maintenance.
• Improving the cyclic durability and reliability of fuel cell stacks in industrial or transportation systems.

BenefitsContent extracted from patent full text and abstract with AI.

• Significantly enhances the long-term performance and durability of fuel cells by reversing catalyst degradation and improving catalyst activity.
• Requires minimal additional energy input, as the energy loss during electrolysis activation is nearly negligible and the overall energy balance remains very high.
• Can be applied during regular operation without needing to dismantle or stop the fuel cell system, making it practical for continuous, real-world use.
• Flexible method that works at the level of individual fuel cells or entire stacks, across different fuel cell geometries and system designs.
• Potentially reduces maintenance, increases service life, and maintains higher power output for longer periods, thereby lowering the total cost of ownership.

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Patent Abstract

The method involves operating the fuel cell during the galvanic operation for a short time, fully or partially in an electrolysis mode. The fuel cell is temporarily provided with the external power source for electrolysis. The fuel cell is provided with an electrolysis stream of the external power source of maximum 50 milliampere per centimeter square. An independent claim is also included for the fuel cell for executing the method.