P2GS.24 - Effect of Pt loading on the response of gas sensors
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
- P-2 - Gas Sensors
- N. Purcell, F. Rhen - Department of Physics, University of Limerick (Ireland), D. Richardson - 3Ei Electronics, Shannon (Ireland), S. Daniels - School of Electronic Engineering, Dublin City University (Ireland)
- 813 - 814
The aim of this work is to determine the minimum electrode platinum loading required for the preparation of reliable electrochemical sensors for CO detection. Pt is a required constituent of the electrode as it catalyzes the oxygen reduction reaction that occurs in the presence of CO. The Pt loading in the electrodes was varied from 0.2 g / cm3 to 0.025 g / cm3. The electrode output shows a minimal decrease as the Pt loading is decreased, until a critical point is reached and output decreases significantly. SEM imaging of the Pt electrodes indicates that the large decrease in output is caused by a percolation threshold between neighboring Pt clusters as opposed to a limited amount of catalyst. This information can be used to decide the optimal amount of Pt to use per sensor depending on desired output or cost.