Thema der Dissertation:
Operando X-ray absorption and Raman spectroscopy studies of electrochemical CO2 reduction catalyzed by copper-based materials
Operando X-ray absorption and Raman spectroscopy studies of electrochemical CO2 reduction catalyzed by copper-based materials
Abstract: The electrochemical CO₂ reduction reaction (CO₂RR) is a promising approach for converting CO₂ into valuable chemicals and fuels, but challenges such as high overpotentials and low product selectivity remain. This thesis investigates copper (Cu)-based foam electrocatalysts, focusing on their ability to promote the formation of multi-carbon products like ethanol and ethylene. Using operando spectroscopic techniques—including X-ray absorption spectroscopy (XAS) and surface-enhanced Raman spectroscopy (SERS)—the structural and chemical evolution of these catalysts was monitored under reaction conditions. The results reveal distinct dynamics at the bulk and surface levels, with subsurface oxygen species and surface hydroxides playing key roles in enhancing *CO adsorption and C–C coupling.
A morphology-control strategy involving NaCl-modified electrodeposition significantly improved alcohol selectivity. Furthermore, bimetallic Cu-In and Cu-Sn foams were developed, demonstrating tunable selectivity toward CO or formate depending on the Cu-to-metal ratio. Overall, this work offers mechanistic insights and design strategies for optimizing Cu-based catalysts and advancing the field of CO₂ electroreduction.
A morphology-control strategy involving NaCl-modified electrodeposition significantly improved alcohol selectivity. Furthermore, bimetallic Cu-In and Cu-Sn foams were developed, demonstrating tunable selectivity toward CO or formate depending on the Cu-to-metal ratio. Overall, this work offers mechanistic insights and design strategies for optimizing Cu-based catalysts and advancing the field of CO₂ electroreduction.
Zeit & Ort
20.06.2025 | 12:00
Hörsaal B (0.1.01)
(Fachbereich Physik, Arnimallee 14, 14195 Berlin)