Electrochemical / Liquid Cell
Electrochemical / Liquid Cell
| Purpose | To enable photoelectron spectroscopy at the solid-liquid and liquid-gas interfaces via use of dip-and-pull or liquid microjet methods |
| Description | Large volume vacuum vessel with two manipulators. Top manipulator holds the sample or microjet; bottom manipulator holds beaker or catcher. Cell access is done via 300 mm front "door" (load-lock style). Sample exchange (EC configuration) is done via removing the sample holder from manipulator. Entrance to the chamber can be through an attached glove box (Ar or N2). Vessel is equipped with halogen lamps for homogenous environment heating |
| Base pressure | 1.0 E-5 mbar Cell not bakeable |
| Pressure range | 1.0 E-5 mbar - 30 mbar |
| Top (sample) manipulator | X, Y, Z, R motorised |
| Bottom (beaker) manipulator | X, Y, Z motorised |
| EC sample holder | 3-electrode setup: WE, RE, and CE placed one after other. WE and CE can be measured by XPS Sample holder can be easily removed from manipulator for electrode/sample exchanging |
| Beaker/Catcher holder | Can hold beakers up to 50 mm diameter and up to 60 mm height. Available beakers of 30, 60, 100, and 150 ml volume. Users can bring their own beakers. Heating or cooling can be provided via temperature-controlled platform on which beaker stands. |
| Potentiostat | Bio-Logic SP200. E range +/- 10V. I range +/- 1 mA. |
| Liquid microjet | Jet insert can replace EC sample holder. Jet operates at equilibrium liquid pressure (24 mbar for water at RT). Nozzles of 15 and 20 µm size are available. Sample loop of 10 ml volume. Capillary mixing of 2 liquids is available. Jet manipulator has heating/cooling jacket. Catcher (bottom manipulator) size: 300 ml. Catcher can be heated and cooled. |
| Glove box | A custom glove box can be attached to allow handling/loading of samples in inert/dry Ar or N2 atmospheres (typically 3ppm O2 and H2O) |
| Availability | available for general users with special training |
Pt 4f (left) and O 1s photoelectron spectra from Pt foil through 20 nm of water film with full electrochemical control
Shifts of water O1s by 1 eV correspond to change on the changes of electrical potential (controlled by potentiostat) by 1 V. Position of Pt peak remain unchanged due to grounding of the sample.
Photon energy: 1800 eV, slit size: 100 µm, acquisition time (per spectrum): 96 s.
Offline testing of liquid microjet
