| 摘要 |
An electrochemical cell 10 for detecting a gas from the surrounding environment comprises an electrolyte 16 and a sensing electrode 12 on gas permeable membrane 18 which is in fluid communication with the electrolyte and the gas to be detected, when present. The cell further comprises a counter electrode 14 in fluid communication with said electrolyte, and also a source of reactant gas provided in a cavity 26 adjacent to the counter electrode, wherein reaction of the gas to be detected at the sensing electrode results in reaction of the reactant gas (typically oxygen) at the counter electrode and wherein the cavity is formed of or comprises a membrane 20. The cell may also have a wick 17 extending between the sensing electrode and the counter electrode and an electrolyte reservoir surrounding the wick. |
