Effect of Co alloying on the electrochemical performance of Ni–Ce0.8Gd0.2O1.9 anodes for hydrocarbon-fueled solid oxide fuel cells

Cho, Chun-Kang; Choi, Byung-Hyun; Lee, Kitae

doi:10.1016/j.jallcom.2012.07.012

Cited by 28 publications

(12 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An enhancement of the cell performance was also reported for the direct oxidation of CH 4 by using a Ni 0.5 Co 0.5 /YSZ anode combined with an ScSZ electrolyte [29]. An appropriate amount of Co alloying in the Ni matrix was found to be effective to reduce the anodic activation overvoltage above about 700 • C. electrical conductivity of Ni is known to decrease by Co alloying due to electron scattering enhancement [23], which can be a factor for lowering the cell performance. Figure 4a shows J-E and J-P curves of the Ni1-XCoX cells supplied with CH4 at 750 °C.…”

Section: Cell Performance For a Ch 4 Supplymentioning

confidence: 78%

“…However, the overvoltage of the Ni 1−X Co X cells increased at x > 0.15, which was caused by a decrease in the TPB length resulting in an increase of the polarization resistance with a decrease of the cell performance. Furthermore, the electrical conductivity of Ni is known to decrease by Co alloying due to electron scattering enhancement [23], which can be a factor for lowering the cell performance. Figure 4a shows J-E and J-P curves of the Ni 1−X Co X cells supplied with CH 4 at 750 • C. The performance of the Ni 1−X Co X cell increased in a similar way to that shown in Figure 3a;…”

Section: Cell Performance For a H 2 Supplymentioning

confidence: 99%

“…The Co alloying also improved the electrocatalytic activity and stability for H 2 containing CO or H 2 S as a fuel [22]. The addition of Co to the Ni/GDC (gadolinia-doped ceria) cermet anode decreased the anodic polarization resistance and moderated the carbon deposition [23]. Nevertheless, the proper mechanism of inhibiting the carbon deposition by Co alloying to Ni in the cermet anode seems to be still unclear and the electrochemical performance and the prolonged stability has not been carefully studied.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Improved Electrochemical Properties of an Ni-Based YSZ Cermet Anode for the Direct Supply of Methane by Co Alloying with an Impregnation Method

et al. 2020

View full text Add to dashboard Cite

To avoid the proneness to degradation due to coking in the operation of solid oxide fuel cells (SOFCs) directly running on methane (CH4) fuels, a modified porous anode of the Ni1−XCoX/YSZ (yttria-stabilized zirconia) cermet prepared by an impregnation method is presented. The influence of the Co alloying content on the cermet microstructure, SOFC characteristics, and prolonged cell performance stability has been studied. Co was incorporated into Ni and formed a solid solution of Ni1−XCoX alloy connected with the YSZ as the cermet anode. The porous microstructure of the Ni1−XCoX/YSZ cermet anode formed by sintering exhibited a grain growth with an increase in the Co alloying content. The electrochemical performance of the cells consisting of the Ni1−XCoX/YSZ cermet anode, the YSZ electrolyte, and the LSM (La0.8Sr0.2MnO3) cathode showed an enhancement by the Ni1−XCoX impregnation treatment for the respective supply of H2 and CH4 to the anode. The cell using the Ni0.75Co0.25/YSZ cermet anode (the Ni0.75Co0.25 cell) showed the highest cell performance among the cells tested. In particular, the performance enhancement of this cell was found to be more significant for CH4 than that for H2; a 45% increase in the maximum power density for CH4 and a 17% increase for H2 at 750 °C compared with the performance of the cell using the Ni/YSZ cermet anode. Furthermore, the prolonged cell performance stability with a continuous CH4 supply was found for the Ni0.85Co0.15 and Ni0.75Co0.25 cells at least for 60 h at 750 °C. These enhancement effects were caused by the optimum porous microstructure of the cermet anode with the low anodic polarization resistance.

show abstract

Section: Cell Performance For a Ch 4 Supplymentioning

confidence: 78%

Section: Cell Performance For a H 2 Supplymentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Improved Electrochemical Properties of an Ni-Based YSZ Cermet Anode for the Direct Supply of Methane by Co Alloying with an Impregnation Method

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Current researches on carbon deposition of SOFCs are mainly focused on optimizing anode materials [6,[12][13][14][15][16][17][18][19][20][21][22] and operating conditions [5,7,8,11,[23][24][25][26][27][28][29]. Modifying/altering the catalyst of the Ni-based anode and adopting other anode materials such as perovskite are widely employed to develop more robust anodes immune to carbon deposition.…”

Section: Introductionmentioning

confidence: 99%

“…Modifying/altering the catalyst of the Ni-based anode and adopting other anode materials such as perovskite are widely employed to develop more robust anodes immune to carbon deposition. These researches are mostly focused on the design and manufacture of new anodes and the attenuation characteristics of relevant macroscopic output parameters to characterize their resistance to carbon deposition [6,[12][13][14][15][16][17][18][19][20][21][22]. However, the formation of carbon deposition is seldom investigated.…”

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann modeling of carbon deposition in porous anode of a solid oxide fuel cell with internal reforming

Han

Dong

2016

Applied Energy

View full text Add to dashboard Cite

h i g h l i g h t sPore scale LB model is built for gas transfer and reaction in anode fed by methane. Local distributions of both position and amount of carbon deposition are presented. Anode microstructure and carbon deposition are correlated. Effect of heterogeneity of anode microstructure on carbon deposition is studied. Strategies for suppressing carbon deposition are obtained and analyzed. a b s t r a c tA pore scale Lattice Boltzmann (LB) model is developed for multi-component mass transport and carbon deposition in the porous anode of a solid oxide fuel cell (SOFC) fed with methane. In this model, the reforming and electrochemical reactions are discretely coupled via local molar fluxes of reactive gas species at catalytically active sites and triple phase boundaries (TPBs). By considering the heterogeneity of anode microstructure, the present pore scale LB model is capable of quantitatively predicting the local distributions of both the position and the amount of deposited carbon in the irregular porous anode. Using this model, the characteristics of carbon deposition in the anode are investigated. It is found that the heterogeneity of anode microstructure has significant influence on mass transport and carbon deposition. Increasing the pre-reforming extent of methane and decreasing the operating temperature are beneficial for the suppression of carbon deposition, whereas they will cause a relatively inferior cell performance. The LB model and results presented in this study are beneficial to mechanism investigation of carbon deposition. Furthermore, they are also helpful for studying the correlations between anode microstructure and carbon deposition and then bridging the manufacture of SOFC electrodes and their performance, which is useful to propose effective suggestions for avoiding performance degradation of SOFC induced by carbon deposition.

show abstract

Facile Construction of Nanostructured Cermet Anodes with Strong Metal–Oxide Interaction for Efficient and Durable Solid Oxide Fuel Cells

Wang

Yue

Chen

et al. 2023

Small

View full text Add to dashboard Cite

Nanostructured anodes generate massive reaction sites to oxidize fuels in solid oxide fuel cells (SOFCs); however, the nonexistence of a practically viable approach for the construction of nanostructures and the retention of these nanostructures under the harsh operating conditions of SOFCs poses a significant challenge. Herein, a simple procedure is reported for the construction of a nanostructured Ni–Gd‐doped CeO2 anode based on the direct assembly of pre‐formed nanocomposite powder with strong metal–oxide interaction. The directly assembled anode forms heterointerfaces with the electrolyte owing to the electrochemical polarization current and exhibits excellent structural robustness against thermal ripening. An electrolyte‐supported cell with the directly assembled anode produces a peak power density of 0.73 W cm−2 at 800 °C, while maintaining stability for 100 h, which is in contrast to the drastic degradation of the cermet anode prepared using the conventional method. These findings provide clarity on the design and construction of durable nanostructured anodes and other electrodes for SOFCs.

show abstract

Effect of Co alloying on the electrochemical performance of Ni–Ce0.8Gd0.2O1.9 anodes for hydrocarbon-fueled solid oxide fuel cells

Cited by 28 publications

References 29 publications

Improved Electrochemical Properties of an Ni-Based YSZ Cermet Anode for the Direct Supply of Methane by Co Alloying with an Impregnation Method

Improved Electrochemical Properties of an Ni-Based YSZ Cermet Anode for the Direct Supply of Methane by Co Alloying with an Impregnation Method

Lattice Boltzmann modeling of carbon deposition in porous anode of a solid oxide fuel cell with internal reforming

Facile Construction of Nanostructured Cermet Anodes with Strong Metal–Oxide Interaction for Efficient and Durable Solid Oxide Fuel Cells

Contact Info

Product

Resources

About