guest ::
| Home > Publications database > Electrochemical Characterization and Degradation of SOEC Stacks during Co-electrolysis |
| Home > Publications database > Electrochemical Characterization and Degradation of SOEC Stacks during Co-electrolysis |
| Talk (non-conference) (Other) | FZJ-2023-04035 |
;
2023
Abstract: High-temperature solid oxide electrolysis cell (HT-SOEC) stacks, within the concept of Power to X (X = chemical/heat), will play a crucial role in the energy transition from fossil fuel to renewable energies by decoupling the production of transport fuels and chemicals from fossil energy sources[1], [2]. One of the crucial chemicals produced from HT-SOEC is syngas (CO/H2). Depending on the ratios of CO:H2, syngas is of tremendous application in traffic/transportation fuels (e.g. H2 for fuel cells or internal engine combustion), the chemical industry, and in energy storage (methanation)[2].Despite the remarkable high performance of HT-SOEC stacks, it suffers from some degradation that results from Ni migration in the fuel electrode, soot/carbon deposition in the system, contaminated feed gases, and reduced electrical contact [3], [4]. The degradation limits the technology readiness level of HT-SOC at 6 [5] and keeps the degradation rate above the recommended rate (0.3 %/kh) by the US department of energy for full commercialization of residential combined heat and power solid oxide cell systems. Thus, the degradation mechanism of HT-SOEC stacks must be fully established to design the process engineering and optimize the stack performance. In order to improve the efficiency of SOCs, insight into the different degradation processes is of great importance.This PhD research is within the framework of the “Incubator for Sustainable Electrochemical Value Chains” (iNEW2.0) project and involves the electrochemical investigation of solid oxide cell (SOC) stack degradation in order to develop novel and efficient electrolysis processes to be used in sustainable “Power to X (X = syngas)” value chains. The iNEW 2.0 project will also investigate the degradation of a new cell with a Ni/CGO functional layer to be developed by another research group. This new cell will be compared to the state of the art Ni/YSZ cells. The operation of the Ni/YSZ cells is within the framework of this PhD research but the operation of the new cell for comparison is not. The targeted degradation rate in the iNEW project at the end of the run time in continuous operation over 3000 h at current density ≥ 1.0 A/cm2 and 800 °C is ≤ 0.5%/kh, which is below the lowest degradation rate of 0.6 %/kh at Forschungszentrum Juelich[5]. The research will be carried out with Juelich F10 5 layer cathode-supported cell (SOEC) stack design.
Keyword(s): Instrument and Method Development (1st) ; Chemistry (2nd)
|
The record appears in these collections: |