5 research outputs found
Pulsed potential electrochemical CO2 reduction for enhanced stability and catalyst reactivation of copper electrodes
Platform for a Hydrocarbon Exhaust Gas Sensor Utilizing a Pumping Cell and a Conductometric Sensor
Very often, high-temperature operated gas sensors are cross-sensitive to oxygen and/or they cannot be operated in oxygen-deficient (rich) atmospheres. For instance, some metal oxides like Ga2O3 or doped SrTiO3 are excellent materials for conductometric hydrocarbon detection in the rough atmosphere of automotive exhausts, but have to be operated preferably at a constant oxygen concentration. We propose a modular sensor platform that combines a conductometric two-sensor-setup with an electrochemical pumping cell made of YSZ to establish a constant oxygen concentration in the ambient of the conductometric sensor film. In this paper, the platform is introduced, the two-sensor-setup is integrated into this new design, and sensing performance is characterized. Such a platform can be used for other sensor principles as well
3. Roadmap des Kopernikus-Projektes P2X Phase II - OPTIONEN FĂśR EIN NACHHALTIGES ENERGIESYSTEM MIT POWER-TO-XTECHNOLOGIEN
Accumulation of Liquid Byproducts in an Electrolyte as a Critical Factor That Compromises Long-Term Functionality of CO<sub>2</sub>‑to‑C<sub>2</sub>H<sub>4</sub> Electrolysis
Electrochemical conversion of CO2 using Cu-based
gas
diffusion electrodes opens the way to green chemical production as
an alternative to thermocatalytic processes and a storage solution
for intermittent renewable electricity. However, diverse challenges,
including short lifetimes, currently inhibit their industrial usage.
Among well-studied determinants such as catalyst characteristics and
electrode architecture, possible effects of byproduct accumulation
in the electrolyte as an operational factor have not been elucidated.
This work quantifies the influence of ethanol, n-propanol,
and formate accumulation on selectivity, stability, and cell potential
in a CO2-to-C2H4 electrolyzer. Alcohols
accelerated flooding by degrading the hydrophobic electrode characteristics,
undermining selective and stable ethylene formation. Furthermore,
high alcohol concentrations triggered the catalyst layer’s
abrasion and structural disfigurements in the Nafion 117 membrane,
leading to high cell potentials. Therefore, continuous removal of
alcohols from the electrolyte medium or substantial modifications
in the cell components must be considered to ensure long-term performing
CO2-to-C2H4 electrolyzers