electrochemical gass sensors

1. Husna Zsaheer
Electrochemical
Gas Sensor

2. Contents
Gas Sensor
History
Types of Electrochemical sensor
Comparison
Applications
Components of sensor
O2 and CO Sensing Mechanism
Limitations
Future perspectives
Conclusion

3. Air pollution is one
of the major issues in
the world.
The main pollutants
are toxic gases such
as nitrogen oxides,
sulfur oxides, carbon
monoxide, etc.
Air pollution kills 7
million people every
year

4. What are
Gas
Sensor?
A gas sensor is a device that
detects the presence or
concentration of gases in the
atmosphere.
Gas sensors reveal the amount of
gas in the environment and the
nature of the gas composition with
electrical signals.

5. History
In 1815, Sir
Humphry
Davy
developed the
Davy lamp
In 1926, Dr.
Oliver Johnson
developed the
catalytical
sensor
In 1926, Dr.
Oliver Johnson
developed the
catalytical
sensor

6. Types of
Electrochemical
sensor
Catalytical
Sensor
Electrochemical
Sensors
Infrared
Sensors

7. Comparison
Electrochemical
sensor
Catalytical
sensor
Infrared
sensor
Selectivity
Detect SOx,
CO, NOx
detect
propane,
methane
and
Detect gas
H2S, CO2,
methane
Stability high low slow
Response
time
Fast slow slow
Effect of
Environment
al factor
less
high
high

8. Electrochemical
Gas Sensor
Also called electrochemical analyzer
These sensors utilize an electrochemical
reaction to detect and measure specific
gases.
Consist of electrodes immersed in an
electrolyte.
When the target gas interacts with the
electrodes, a chemical reaction occurs which
generates an electrical signal.

9. Applications
Environmental screening Industrial usage
Food quality control
Clinical diagnosis

10. Components
of sensor

11. Qualities of
a Sensing
Material
The working electrode in electrochemical gas
sensors is designed to facilitate the
electrochemical reaction between the target gas
and the sensing materials
Sensing material
Large surface area
Selectivity
Fast Response Time
Cost-Effectiveness
Pt doped Sno2
Cd doped TiO2
Cr-doped ZnO

12. O2 and CO
Sensing
Mechanism
O2 + e- O2
-
O2
- + e- 2O-
2O- + e- O2-
O2
- + 2CO 2 CO2 + 2e-
O- + CO 2CO2 + e-
O2- + CO 2 CO2 + 2e-

13. Limitations
Cross sensitivity
Limited Lifespan
Poisoning
Cost

14. Future
Perspective
Multi-Gas Detection
Low-Power Operation
Personal Safety Devices
Automotive Emissions Control

15. Market value of Electrochemical Gas
sensors from 2014-2021

16. References
Gianluca Gatto , Gabriela Broncova and Amit Kumar.
Electrochemical Sensors and Their Applications: A Review Jaya
Baranwal, Brajesh Barse ,. Chemosensors 10, 363 (2022)
Wan, Hao, Heyu Yin, Lu Lin, Xiangqun Zeng, and Andrew J.
Mason. "Miniaturized planar room temperature ionic liquid
electrochemical gas sensor for rapid gas pollutants
monitoring." Sensors and Actuators B: Chemical 255 (2018):
638-646.
Mu, X., Wang, Z., Zeng, X., & Mason, A. J. (2013). A robust
flexible electrochemical gas sensor using room temperature ionic
liquid. IEEE Sensors Journal, 13(10), 3976-3981.

17. Mariane A. Franco, Patrick P. Conti, Rafaela S. Andre, Daniel S.
Correa. A review on chemiresistive ZnO gas sensors. Sensors and
Actuators Reports 4 (2022) 100100
Ababay Ketema Worku,Delele Worku Ayele, Nigus Gabbiye
Habtu. Structural and thermal properties of pure and chromium
doped zinc oxide nanoparticles. SN Applied Sciences 3:699(2021)
 Aminuddin Debataraja, Ni Luh Wulan Septiani, Brian Y uliarto,
Nugraha, Bambang Sunendar,Huda Abdullah. High performance of
a carbon monoxide sensor based on a Cr-doped ZnO composite.
Ionics 25:4459–4468(2019)
References

18. Thank
you