Multifactor theoretical analysis of current leakage in proton-conducting solid oxide fuel cells

Qiu, Ruiming; Lian, Wenchao; Ou, Yongzhen; Tao, Zetian; Cui, Yuxin; Tian, Zhipeng; Wang, Chao; Chen, Ying; Liu, Jianping; Lei, Libin; Zhang, Jihao

doi:10.1016/j.jpowsour.2021.230038

Cited by 16 publications

(5 citation statements)

References 31 publications

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“…65%, close to that obtained from measuring the amount of hydrogen gas generated. The less-than-100% faradaic efficiency can be attributed to current leakage caused by the non-negligible electron–hole conductivity of the electrolyte layer and is reasonable for the thin BCZY electrolyte employed in this cell . Proton-conducting electrolyte materials based on BZY, BCY, or BCZY are mixed ionic-electronic conductors at elevated temperatures, not pure proton conductors .…”

Section: Resultsmentioning

confidence: 82%

“…The lessthan-100% faradaic efficiency can be attributed to current leakage caused by the non-negligible electron−hole conductivity of the electrolyte layer and is reasonable for the thin BCZY electrolyte employed in this cell. 32 Protonconducting electrolyte materials based on BZY, BCY, or BCZY are mixed ionic-electronic conductors at elevated temperatures, not pure proton conductors. 33 According to literature, their electronic conductivity does not affect the device performance in fuel cell mode significantly, but it can greatly degrade the cell performance in electrolysis mode, as shown by modeling predictions and experimental verifications.…”

Section: Materials Characterization and Fuel Cell Testsmentioning

confidence: 99%

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Three-Dimensional NiO-Decorated La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ Nanofibrous Mesh as High-Performance Cathode for Protonic Ceramic Electrochemical Cells

Umer

Lee

et al. 2023

ACS Appl. Energy Mater.

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For commercialization of a solid oxide fuel cell, it is vital to develop cathode materials with optimal microstructure in order to overcome the trade-off between lower operation temperature and higher oxygen reduction reaction (ORR) rate and conductivity. In this work, we design and synthesize cost-effective La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) nanofibers decorated with uniformly distributed NiO nanoparticles as the cathode of protonic ceramic electrochemical cells. With an appropriate NiO decoration to tune the ORR activity and hierarchical microstructure of LSCF nanofibers, the three-dimensional (3D) NiO-LSCF nanofibrous mesh cathode exhibits significantly higher peak power density than that with a bare LSCF nanofiber mat cathode in solid oxide fuel cell (SOFC) tests. The reduced ohmic and polarization resistances caused by NiO incorporation can be attributed to the increased connectivity in the LSCF 3D mesh due to enhanced sintering at contacts between nanofibers, which facilitates oxygen ion and electron transports, and the uniformly distributed NiO nanoparticles over the LSCF nanofiber surface, which increases the ORR activity. Furthermore, when operated in solid oxide electrolysis cell (SOEC) mode, a current density of −780 mA/cm 2 with a faradaic efficiency of 69% is obtained at 800 °C with the 15 wt % NiO-decorated LSCF 3D mesh. All these findings show that the combination of mixed ionic-electronic conductor (MIEC) 3D mesh and its surface decoration with nanoparticles of high ORR activity can effectively boost the performance of P-SOFCs and SOECs.

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Section: Resultsmentioning

confidence: 82%

Section: Materials Characterization and Fuel Cell Testsmentioning

confidence: 99%

Three-Dimensional NiO-Decorated La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ Nanofibrous Mesh as High-Performance Cathode for Protonic Ceramic Electrochemical Cells

Umer

Lee

et al. 2023

ACS Appl. Energy Mater.

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“…Meanwhile, the conductivity values in air are higher than those in hydrogen. This is mainly caused by the electronic hole conduction introduced in oxidizing atmosphere, as expressed by the following equation 28,32,33 :

\begin{equation}{{\rm{O}}_2} + 2{\rm{\;\;}}V_{\rm{O}}^{{\rm{\;}} \cdot \cdot } = {\rm{\;}}4{\rm{\;}}{{\rm{h}}^ \cdot } + 2{\rm{\;O}}_{\rm{O}}^ \times \end{equation}

…”

Section: Resultsmentioning

confidence: 99%

Section: Conductivity Of Bzcymentioning

confidence: 99%

Electrochemical performance and chemical stability of proton‐conducting BaZr_0.8−_xCe_xY_0.2O₃₋_δ electrolytes

et al. 2022

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Protonic ceramic fuel cells (PCFCs) using BaZr0.8−xCexY0.2O3−δ (BZCY) as electrolyte materials have attracted widespread attention because of their high performance at reduced temperature. However, there are few systematic studies on both the performance and stability of BZCY materials. In this paper, we report our work on the electrochemical performance and chemical stability of BaZr0.8−xCexY0.2O3−δ (x = 0, 0.1, 0.3, 0.5, and 0.7) series. The results show that electronic hole conductivity decreases with increasing Ce4+ content, especially at high temperature. In addition, H2 atmosphere reduces the conductive activation energy of BZCY. On the contrary, air atmosphere causes serious electronic leakage. These effects are also reflected in the operation of PCFCs, that is, the higher the Ce4+ content, the higher the open‐circuit voltage and output power density. However, low Ce4+ content may stabilize the materials in CO2 atmosphere. At 700°C, an anode‐supported PCFC based on BaZr0.1Ce0.7Y0.2O3−δ electrolyte, using humid H2 fuel, gives a peak power density of 1.0 W cm−2. At 600°C, BaZr0.8Y0.2O3−δ and BaZr0.7Ce0.1Y0.2O3−δ show a good stability in CO2‐containing atmosphere.

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“…Liu et al [8] experimentally tested the performance of a button H-SOFC with a configuration of BZCY17-Ni/BZCY17/LSCF. Anode was fed with 3% H2O/97% H2, while the cathode was fed with wet air containing 3% H2O.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Leakage Current on the Performance of Proton-Conducting Solid Oxide Fuel Cells

Li¹,

Zhang²,

Song³

et al. 2022

Advances in Energy Research and Development

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In this study, a numerical model is built to analyze the leakage current of a proton conductor solid oxide fuel cell. The transports of electron-hole and proton transfer in a mixed conductor electrolyte is described by the Nernst-Planck equation. The model is validated using experimental data. The leakage current, potential distribution, Faraday efficiency and energy efficiency are analyzed. When the output voltage of the fuel cell is greater than 0.5 V, the leakage current will cause the energy efficiency in a significant reduction. The lower the temperature, the lower the leakage current density. Lowering the temperature will improve the Faraday efficiency and energy efficiency of the fuel cell. Lower output voltage helps improve the Faraday efficiency.

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Multifactor theoretical analysis of current leakage in proton-conducting solid oxide fuel cells

Cited by 16 publications

References 31 publications

Three-Dimensional NiO-Decorated La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ Nanofibrous Mesh as High-Performance Cathode for Protonic Ceramic Electrochemical Cells

Three-Dimensional NiO-Decorated La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ Nanofibrous Mesh as High-Performance Cathode for Protonic Ceramic Electrochemical Cells

Electrochemical performance and chemical stability of proton‐conducting BaZr_0.8−_xCe_xY_0.2O₃₋_δ electrolytes

The Effect of Leakage Current on the Performance of Proton-Conducting Solid Oxide Fuel Cells

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Multifactor theoretical analysis of current leakage in proton-conducting solid oxide fuel cells

Cited by 16 publications

References 31 publications

Three-Dimensional NiO-Decorated La0.6Sr0.4Co0.2Fe0.8O3-δ Nanofibrous Mesh as High-Performance Cathode for Protonic Ceramic Electrochemical Cells

Three-Dimensional NiO-Decorated La0.6Sr0.4Co0.2Fe0.8O3-δ Nanofibrous Mesh as High-Performance Cathode for Protonic Ceramic Electrochemical Cells

Electrochemical performance and chemical stability of proton‐conducting BaZr0.8−xCexY0.2O3−δ electrolytes

The Effect of Leakage Current on the Performance of Proton-Conducting Solid Oxide Fuel Cells

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Three-Dimensional NiO-Decorated La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ Nanofibrous Mesh as High-Performance Cathode for Protonic Ceramic Electrochemical Cells

Three-Dimensional NiO-Decorated La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ Nanofibrous Mesh as High-Performance Cathode for Protonic Ceramic Electrochemical Cells

Electrochemical performance and chemical stability of proton‐conducting BaZr_0.8−_xCe_xY_0.2O₃₋_δ electrolytes