Counter Electrodes

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What is a Counter Electrode? | Browse Counter Electrodes | Counter Electrode Materials | Wire, Plate and Mesh Electrodes | Selection Guide | Resources Our counter electrodes (CE) come in multiple materials, geometries, and sizes, and can be used with our electrochemical cells and alternative electrodes. Counter Electrode in Three Electrode EC Cell What is a Counter Electrode? A counter electrode, also known as auxiliary electrode, is a crucial component in three-electrode electrochemical cells. The counter electrode completes the electrical circuit, allowing current to flow to/from the working electrode. Without a suitable counter electrode, the electrochemical cell would not operate. When choosing a counter electrode, you should consider: Surface Area: The CE surface area should be at least 10x larger than the WE. This maintains low current density and prevent the CE from reaching extreme potentials. Counter electrodes can have various geometries such as standard wire, coil, mesh or plate. Material Choice: While Pt is versatile, Graphite is a cost-effective alternative for long-term studies, provided it is monitored for carbon corrosion or particle shedding in strong alkaline/oxidative environments. Cost, Stability and Maintenance: The ideal choice of electrode depends on the desired application. Platinum is ideal for multiple applications and is long lasting, so is more expensive. Graphite is lower cost, so can be used in long lasting applications. Here, the electrode can be more expendable. If using a H-type electrochemical cell, the counter electrode is separated from the working electrode using a membrane to avoid product interference or working electrode contamination. All the counter electrode suggestions made here for laboratory experiments only. To maintain the high quality of our working electrodes, consider using our electrode polishing kit. Browse Counter Electrodes Related categories: substrates and fabrication , electrochemical cells , photoelectrochem