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FIGURE 3. The improvement shown in transient response and estimated response time in CO concentration at 550° C for LSM modified sensor [22] The increasing attention towards rare-earth material has also been kind to the development of better sensor, given that many studies have been done to prove the uniqueness of its electrical properties. In one study, both active electrodes and inactive electrodes as parts of the system were all prepared from rare-earth metal oxides; Ce)xZrxO2, and Lao.sSto.sCoO3 - Lao sSro.sFeO3 - Lao.sSto.sNiO3 - Lao.sSro.sCoo.sNio.203 - Lao.sSto.sMno.sNio20, respectively[2 1].

Figure 3 The improvement shown in transient response and estimated response time in CO concentration at 550° C for LSM modified sensor [22] The increasing attention towards rare-earth material has also been kind to the development of better sensor, given that many studies have been done to prove the uniqueness of its electrical properties. In one study, both active electrodes and inactive electrodes as parts of the system were all prepared from rare-earth metal oxides; Ce)xZrxO2, and Lao.sSto.sCoO3 - Lao sSro.sFeO3 - Lao.sSto.sNiO3 - Lao.sSro.sCoo.sNio.203 - Lao.sSto.sMno.sNio20, respectively[2 1].

Related Figures (2)

The most common model of an amperometric, electrochemical gas sensor incorporates three electrodes as the main hub for ionic transports. These electrodes are separated by hydrophilic membranes known as wetting filters. The membranes are hydrophilic so that they can transport the electrolyte between the adjacent electrodes, enabling ions to move from and into them (Figure1)[10]. As any three electrodes system, it consists of the working, reference, and counter electrode to perform under the reduction-oxidation(redox) principle[11]. The working electrode is where reduction or oxidation happens, depending on how the system interacts with the observed gas species. For every reaction on the surface of the working electrode, it will draw a response from th¢ balancing pole, the counter electrode. As the system comes on, the counter electrode will try to balance the chang« ofpotential as a result of reaction between the detected gases and the working electrode. This balancing current 1: dynamically monitored as the main reading of an amperometric electrochemical sensor. In order for the system tc sustain, the potential on the working electrode must be inherently fixed with the use of reference electrode[12]. Owing to these balancing mechanisms, the three-electrode design can maintain the sensor sensitivity and linearity for the better part of its lifetime. A gas permeable membrane usually acts as a gateway for gases to enter the system. Thi: hydrophobic membrane will separate the water from the gases well as regulates the amount of gas that is allowed tc reach the surface of the working electrode while preventing any leakage of the liquid from inside the sensor (Figure 2).
The most common model of an amperometric, electrochemical gas sensor incorporates three electrodes as the main hub for ionic transports. These electrodes are separated by hydrophilic membranes known as wetting filters. The membranes are hydrophilic so that they can transport the electrolyte between the adjacent electrodes, enabling ions to move from and into them (Figure1)[10]. As any three electrodes system, it consists of the working, reference, and counter electrode to perform under the reduction-oxidation(redox) principle[11]. The working electrode is where reduction or oxidation happens, depending on how the system interacts with the observed gas species. For every reaction on the surface of the working electrode, it will draw a response from th¢ balancing pole, the counter electrode. As the system comes on, the counter electrode will try to balance the chang« ofpotential as a result of reaction between the detected gases and the working electrode. This balancing current 1: dynamically monitored as the main reading of an amperometric electrochemical sensor. In order for the system tc sustain, the potential on the working electrode must be inherently fixed with the use of reference electrode[12]. Owing to these balancing mechanisms, the three-electrode design can maintain the sensor sensitivity and linearity for the better part of its lifetime. A gas permeable membrane usually acts as a gateway for gases to enter the system. Thi: hydrophobic membrane will separate the water from the gases well as regulates the amount of gas that is allowed tc reach the surface of the working electrode while preventing any leakage of the liquid from inside the sensor (Figure 2).
FIGURE 2. Hydrophobic membrane preventing the leakage of electrolyte from the sensor[12]
FIGURE 2. Hydrophobic membrane preventing the leakage of electrolyte from the sensor[12]
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