NANO ROCKS Energy Materials. Technologies and Scientific Equipment
NANO ROCKS Energy Materials. Technologies and Scientific Equipment
Energy Materials
Technologies and Scientific Equipment
PEM Conductivity Sample Holder
The polymer electrolyte membrane (PEM) sample holder for ProboStat™ is a PEEK head to be mounted in the top of a standard ProboStat™ support tube. It has a flat top surface with 4 wire electrodes onto which the polymer film is pressed down with the spring load of the ProboStat™, for measuring the in-plane conductivity primarily of polymer electrolyte membrane films, but also other flexible and/or soft films.It can operate at temperatures and conditions where the PEEK and metal parts are stable, typically long term up to around 200°C, for shorter term e.g. 250°C. The PEEK head is replaceable.
Specifications
Core material: PEEK
Electrodes: 4 electrodes in the shape of 4 integrated wires
Electrode wires: Au (default), Pt or Ag (all replaceable)
Contact from ProboStat™ base unit: Standard Pt or any other metal (e.g. Cu) wires
Mounting: Any length standard ProboStat™ 20 mm support tube
Sample fixation: Standard ProboStat™ spring load system
Temperature range: RT - 200~300°C
Heating: Heating mantle or tubular furnace (not included)
Atmosphere (ProboStat™): Oxidizing, inert, reducing, corrosive, wet or dry
Accessories
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Perforated PEEK plate.
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PEEK head with 4 double-sided double electrode wire screw terminals.
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4 (short) electrode wires with 0.5 mm diameter, typically of Pt, Au, or Cu. May be pre-mounted in the PEEK head. Extra electrode wires may be supplied separately if ordered.
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4 (long) electrode connects, typically 0.5 mm diameter of Pt, Au, or Cu, lengths according to the length of the support tube. They have female mini-contacts in one end and are either insulated with plastic, or equipped with ceramic insulating tubes.
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Thermocouple assembly TCI-P consisting of type S or type K thermocouple wires in a two-bore alumina tube, with minicontacts, and colour-coded wire insulation
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Example measurements on Nafion® N-115 membrane
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First 4-electrode measurement – poorly contacting, polarizing electrodes
Nyquist plot of Nafion N-115 and its equivalent circuit in ambient atmosphere
at room temperature measured by a 4-electrode configuration. The high
frequency arc is attributed to the bulk response, while artefacts of the
electrode responses are seen at low frequencies. The two numbers along
the graph show the AC frequency range.
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Temperature dependency
Log conductivity of Nafion N-115 as a function of inverse absolute temperature at constant partial pressure of water.
PEM conductivity sample holder brochure.
