5.2.5 - Ensemble Nuclearity Optimum in Chemoresistive Hydrogen Sensing
- Event
- EUROSENSORS 2026
2026-09-06 - 2026-09-09
Zurich - Band
- Lectures
- Chapter
- Emerging Sensor Materials
- Author(s)
- H. Shin, A. Güntner - ETH Zürich,Zürich (Switzerland)
- Pages
- 175 - 176
- DOI
- 10.5162/eurosensors2026/5.2.5
- ISBN
- 978-3-910600-12-6
- Price
- free
Abstract
Chemoresistive hydrogen sensing with Pd-functionalized oxides still depends largely on empirical optimization, as the atomic-scale descriptor governing performance remains unclear. Here, we establish ensemble-defined Pd motifs with controlled nuclearity (Pd₁-Pd₃) on a nanostructured oxide and identify a non-monotonic nuclearity-performance relationship with an intermediate ensemble as the optimum. Combined experiments and density functional theory calculations show that this trend originates from nuclearity-specific hydrogen adsorption and activation rather than oxygen-centered surface descriptors.