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Using operando techniques to understand and design high performance and stable alkaline membrane fuel cells.

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Understanding water dynamics in alkaline membrane fuel cells is key for performance. This study reveals anode water accumulation and cathode dryout, leading to new designs for over 1000 hours of stable operation.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Alkaline membrane fuel cells (AMFCs) require optimized water management for high performance and durability.
  • Understanding liquid water distribution is crucial for preventing performance loss and ensuring long-term stability.

Purpose of the Study:

  • To visualize and understand the spatial and temporal distribution of liquid water within operating AMFCs.
  • To identify operating conditions that lead to performance loss and to develop strategies for enhanced durability.

Main Methods:

  • Operando neutron imaging.
  • Operando micro X-ray computed tomography (micro-CT).

Main Results:

  • Direct evidence of liquid water accumulation at the anode, causing ionomer swelling and performance degradation.
  • Observation of cathode dryout due to insufficient water content.
  • Identification that optimal power density conditions do not necessarily ensure long-term stable operation.

Conclusions:

  • New catalyst layer and gas diffusion layer designs were developed based on water dynamics insights.
  • Achieved continuous operation of AMFCs for over 1000 hours at 600 mA cm⁻² with a low voltage decay rate (32 μV h⁻¹).
  • Demonstrated unprecedented durability for AMFCs, setting a new benchmark in the field.