| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
2024 Undergraduate Student Poster Contest
|
| Presentation Title |
SPU-33: Cs+ Intercalation in WO3 Photoelectrodes Inhibits Catalyst Deactivation for the Oxygen-Evolution Reaction |
| Author(s) |
Matias Moreno |
| On-Site Speaker (Planned) |
Matias Moreno |
| Abstract Scope |
The anodic half-reaction to generate H2 as a renewable fuel has historically utilized the oxygen evolution reaction (OER) on WO3 electrodes. Oxidation of W5+ to W6+ under an applied bias deintercalates H+ to maintain electroneutrality. Unfortunately, WO3 electrode hole recombination oxidizes the n-type dopant, decreasing photocurrent densities. A proposed mechanism integrates cation intercalants into WO3 to inhibit catalyst deactivation. Synthesis of these intercalated semiconductor films involves doping 1 mol% cesium perchlorate into tungsten oxide lattices. Prolonged photoelectrochemical experiments in various electrolytes observe cesium cations' influence on OER kinetics. Intercalation of cations and tungsten oxidation is corroborated by XRD and XPS data. We hypothesize larger ionic radii may increase cation retention, preserving the W5+ dopant during OER electrolysis. |