The sealed H-type electrolytic cell model is HZC-(U)S04, where the letter "U" stands for unsealed version. The recommended liquid volumes for the working compartment and auxiliary compartment are 50 mL and 100 mL respectively. A sealed port for temperature measurement and sampling is reserved at the top of the working compartment. The two compartments are separated by DuPont Nafion 117 membrane. As a jacketed double-wall electrolytic cell, both compartments can be connected to an external circulating water system for temperature control.
| Time (min) | Pressure (mmHg) | Time (min) | Pressure (mmHg) |
|---|---|---|---|
| 0 | -666 | 15 | -663 |
| 5 | -664 | 20 | -661 |
Note: The sealing performance test was carried out with the DPC-2B digital low vacuum pressure gauge.

