The palladium-hydrogen electrode (PHE) is an electrochemical half-cell that serves as a standard reference electrode. It consists of a palladium electrode that is in contact with hydrogen gas at a controlled pressure and temperature. The key feature of this electrode is that palladium has the unique ability to absorb hydrogen, allowing it to maintain a stable hydrogen equilibrium. ### Key Components: 1. **Palladium Electrode**: A palladium metal surface that can absorb hydrogen gas.
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