Mechanism-Informed Breakdown: Understanding Degradation by Controlling Voltage-Hold Patterns in Proton Exchange Membrane Water Electrolyzers.

The sulfuric acid analog (H 3 SO 4 ) in TOF-SIMS also showed a decreasing trend in signals from the anode CL-PTL interface toward the membrane, and formed a peak near the CL-membrane interface ( Figure S12 ), which provides evidence of OH radical attack on Nafion polymer.

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