Article
Chemistry, Physical
D. A. Osinkin
Summary: Nickel-ceramic composites are commonly used materials for solid oxide fuel cell anodes. The electrochemical activity of these composites can be improved by increasing the triple phase boundary length or impregnating with ceria. This study investigated highly active Ni-ceramic electrodes with different dispersion made from NiO and Zr0.84Sc0.16O1.92 powders and impregnation with ceria. The analysis using the distribution of relaxation times method revealed that the hydrogen oxidation rate in electrodes with low porosity is limited by two parallel gas diffusion processes in the same frequency range.
JOURNAL OF POWER SOURCES
(2023)
Article
Electrochemistry
Zhufeng Ouyang, Anna Sciazko, Yosuke Komatsu, Katsuhiko Nishimura, Naoki Shikazono
Summary: In this study, the electrochemical performance and microstructure evolutions of Ni-M (M = Fe, Cu, Mn) bimetallic fuel electrodes were investigated under SOFC and SOEC operations. The results showed that the electrochemical performance of all Ni-M bimetallic fuel electrodes were lower than pure Ni electrode during SOFC tests, while the degradation rates of Ni-Fe and Ni-Mn electrodes were smaller than the others. Ni migration on YSZ surface was observed for all samples, and such Ni migration was suppressed by Fe and Mn addition, whereas it was enhanced by Cu addition. During SOEC tests, the cell performance degraded with Cu and Fe addition, but improved with Mn addition. The adhesion between Ni film and YSZ substrate was enhanced by doping Fe and Mn, which correlated well with the inhibited degradation in both fuel cell and electrolysis operations. The Ni migration phenomenon is discussed by the strength of Ni-O bond, surface tension and melting point, which are influenced by the addition of transition metal elements.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Electrochemistry
Anke Hagen, Aiswarya Krishnakumar Padinjarethil, Jelle Heijne
Summary: Solid oxide cells (SOCs) have high efficiencies in converting fuel to electrical energy (>60%) in fuel cell mode, and in converting electrical energy to fuel such as hydrogen (>90%) in electrolysis mode. They are versatile in terms of usable fuels and gases, as well as operating modes. SOCs can provide a solution for the intermittent nature of renewable energy sources. The study successfully separated the different electrode contributions in SOCs through impedance analysis, which is challenging due to the strong overlap of electrode contributions.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Physical
Buse Bilbey, Meltem Sezen, Cleva W. Ow-Yang, Busra Tugba Camic, Aligul Buyukaksoy
Summary: A new method for fabricating nickel and YSZ composite anodes was utilized in this study, with the application of a pre-calcination step in the oxidized state and a CeO2 overlayer, which significantly improved the electrochemical performance and stability of the anodes.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Rung-Chuan Lee, Joseph Franklin, Chixia Tian, Dennis Nordlund, Marca Doeff, Robert Kostecki
Summary: The study demonstrates that a simple surface treatment can suppress film formation on NMC electrodes and reduce impedance rise; detailed modeling shows that surface treatment helps reduce cell impedance.
JOURNAL OF POWER SOURCES
(2021)
Article
Electrochemistry
C. Grosselindemann, N. Russner, S. Dierickx, F. Wankmuller, A. Weber
Summary: The deconvolution of physicochemical processes in impedance spectra of SOCs with nickel/ceria fuel electrodes was challenging due to strong overlap of gas diffusion with electrochemical processes. By using symmetrical cells and altering components in fuel gas mixture, an effective gas transport parameter was derived for precise quantification of gas diffusion-related polarization resistances. Model validation in fuel cell and electrolyzer mode showed excellent agreement between measured and simulated current/voltage characteristics under various gas compositions and temperatures.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Electrochemistry
Federico Monaco, Elisa Effori, Maxime Hubert, Elisabeth Siebert, Gregory Geneste, Bertrand Morel, Elisabeth Djurado, Dario Montinaro, Jerome Laurencin
Summary: The electrochemical reactions of hydrogen oxidation and steam reduction on a porous cermet electrode made of Ni and 3YSZ were investigated, showing different response mechanisms under anodic and cathodic current. A continuous dynamic model was developed to interpret the experimental results based on charge transfer mechanisms. The electrode response is controlled by charge transfer at triple phase boundary lengths, oxygen vacancies migration in the 3YSZ network, and a purely chemical surface process depending on polarization.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Multidisciplinary
Denis Artyukhov, Nikolay Kiselev, Elena Boychenko, Aleksandra Asmolova, Denis Zheleznov, Ivan Artyukhov, Igor Burmistrov, Nikolay Gorshkov
Summary: This paper demonstrates the importance of cost-effective waste heat utilization and thermoelectrochemical cells in the field of renewable energy research. It proposes a thermoelectrochemical cell scheme with high energy conversion efficiency. By using high KOH electrolyte concentration, the paper successfully achieved a decrease in charge transfer resistance from 3.5 to 0.52 ohms and a reduction in capacitive behavior due to diffusion effects.
Article
Chemistry, Physical
Irene Yuste-Tirados, Xin Liu, Christian Kjolseth, Truls Norby
Summary: Impedance spectroscopy was used to analyze the electrochemical behavior of a tubular cell with BZCY electrolyte and Ni-BCZY cermet electrodes. The study provides guidance for electrode parameterization and optimization.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Materials Science, Multidisciplinary
Artem P. Tarutin, Yulia G. Lyagaeva, Aleksey I. Vylkov, Maxim Yu. Gorshkov, Gennady K. Vdovin, Dmitry A. Medvedev
Summary: The research focuses on rational engineering of Cu-doped Pr(2)NiO4(+delta) materials and analyzing their electrode behavior for reversible protonic ceramic cells. Results show that copper doping with x = 0.2 has a positive impact on the thermomechanical compatibility of the Ba(Ce,Zr)O-3-based electrolytes.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Michal Krbata, Peter Fabo, Marcel Kohutiar, Jana Escherova, Michal Kuba, Marta Kianicova, Maros Eckert
Summary: The study focuses on the super-alloy Inconel 713LC with an Al-based coating applied through the Out-of-pack diffusion coating process, or CrAl. The thickness of the coating was measured using a confocal laser microscope, and impedance spectroscopy was used to investigate the properties of the thin layers. The results demonstrate the feasibility of using a VF probe, which utilizes ferrite to maintain consistent inductance, to study thin layers. Eddy currents caused a significant decrease in inductance at higher frequencies due to the presence of a metal sample in the probe's magnetic circuit. However, accurate impedance measurement with a precision of 1m Omega and phase angle measurement with a precision of 0.001 degrees, along with high frequency stability, are necessary. Extending the frequency range to the MHz range is also important for better assessment of layer parameters.
MANUFACTURING TECHNOLOGY
(2023)