Battery Testing Cells

Testing cells are where a candidate chemistry meets reality — the fixture decides whether your data reflects the material or the hardware. This collection covers laboratory-scale electrochemical cells used to evaluate batteries, electrolyzers, fuel cells, photoelectrochemical systems, corrosion behavior, and water-treatment processes under controlled, reproducible conditions.

The hardware is grouped by what you are trying to measure:

Battery testing fixtures

• Sealed metal-gas jars for Li-O2, Li-CO2, and solid-state cycling, with gas inlet/outlet and electrical clip for strict atmosphere control.
• Swagelok-style cells with optical windows for in-situ observation of dendrite growth, plating/stripping, and interfacial morphology during cycling.
• Operando split cells for IR (ATR mode), Raman, and X-ray computed tomography, designed to balance spectroscopic or X-ray transparency with stack pressure.

Electrolyzer, fuel-cell, and CO2-conversion cells

• Flow electrolyzers with serpentine or parallel flow fields, including variants with quartz windows for operando optical access.
• Integrated capture-and-conversion flow cells for reactive CO2 conversion from carbamate or bicarbonate feeds.
• Porous solid-electrolyte (PSE) reactors using a sulfonated PFSA ionomer (Nafion) or ceramic conductor to deliver salt-free product streams.
• Photoelectrochemical-electrochemical (PEC-EC) hybrid cells with double-side quartz windows for tandem photoelectrode work.

Fundamental electrochemistry and corrosion

• Three- and five-port glass cells for working / reference / counter setups with auxiliary ports for purging and sensors.
• Flat corrosion cells that clamp sheet specimens against an O-ring to define a precise active area and suppress edge effects.

Separation and water-treatment cells

• Flow-electrode capacitive deionization (FCDI) test cells built as plate-and-frame assemblies with flowing carbon-slurry electrodes.
• Redox flow battery stacks with bipolar plates and serpentine channels for evaluating membranes, electrolytes, and stack-level fluid dynamics.

If you are screening battery materials, start with Swagelok or split-cell formats; for catalyst and membrane evaluation under flow, choose an electrolyzer or RFB stack; for spectroscopic or imaging studies, pick the operando variant matched to your probe. For the components that go inside these fixtures — membranes, gaskets, current collectors, and electrodes — see Battery Consumables and Electrolyzers & Fuel Cells.