Improved electrochemical performance of Sr 2 Fe 1.5 Mo 0.4 Nb 0.1 O 6−δ –Sm 0.2 Ce 0.8 O 2−δ composite cathodes by a one-pot method for intermediate temperature solid oxide fuel cells

Guan, Mengjie; Sun, Wang; Ren, Rongzheng; Fan, Qinghua; Qiao, Jinshuo; Wang, Zhenhua; Rooney, David; Feng, Jimin; Sun, Kening

doi:10.1016/j.ijhydene.2015.12.056

Cited by 10 publications

(4 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…R 1 represents ohmic resistance from electrolyte resistance and electrode ohmic resistance (subtracted from the impedance plot). The green semicircle (Figure c and Figure S8) in the high frequency region corresponds to the oxygen ion transfer process at the electrode/electrolyte interface (R 2 CPE 1 ). , The blue half-tear-drop curve (Figure c and Figure S8) in the low frequency region presents the oxygen bulk diffusion and surface chemical exchange (gas adsorption, dissociation, and oxygen exchange) colimited process (Lo 1 ). ,, R chem and C chem as a function of temperature are plotted in Figure d. As expected, R chem decreases as the temperature increases, which implies a faster surface kinetics at higher temperature.…”

Section: Results and Discussionmentioning

confidence: 69%

“…The green semicircle (Figure 8c and Figure S8) in the high frequency region corresponds to the oxygen ion transfer process at the electrode/electrolyte interface (R 2 CPE 1 ). 63,64 The blue half-tear-drop curve (Figure 8c and Figure S8) in the low frequency region presents the oxygen bulk diffusion and surface chemical exchange (gas adsorption, dissociation, and oxygen exchange) colimited process (Lo 1 ). 61,65,66 R chem and C chem as a function of temperature are plotted in Figure 8d.…”

Section: Electrical Conductivity During Redox Cyclingmentioning

confidence: 99%

See 1 more Smart Citation

Reduced Thermal Expansion and Enhanced Redox Reversibility of La_0.5Sr_1.5Fe_1.5Mo_0.5O_6−δAnode Material for Solid Oxide Fuel Cells

Thomas

et al. 2019

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

High performance anode materials with suitable thermal and chemical expansions are highly desirable for solid oxide fuel cells. In this work, we report a promising anode material La0.5Sr1.5Fe1.5Mo0.5O6‑δ (LSFM) synthesized in nitrogen at 1050 °C. Its phase stability, mechanical behavior, redox stability, and electrochemical performance were studied. The electrical conductivity of LSFM reaches 23 S cm–1 in 5% H2–95% N2 at 800 °C with excellent reversibility over three redox cycles. After lanthanum doping, the coefficient of thermal expansion (CTE) is reduced from 17.12 × 10–6 K–1 (SF1.5M) to 15.01 × 10–6 K–1 (LSFM), and this value can be lowered further with a higher lanthanum content. Dilatometry testing at 800 °C shows that the chemical expansion behavior of LSFM is highly reversible during the oxidation–reduction cycling. These results indicate that the thermal and chemical expansion of the crystal lattice can be reduced by a stronger metal–oxygen (M–O) bond strength, leading to an improvement in redox reversibility. The polarization resistance of the LSFM symmetrical cell at 800 °C in humidified hydrogen is 0.16 Ω cm2, and the active region is ∼4.5 μm. The half-tear-drop-shaped impedance spectroscopy indicates an oxygen bulk diffusion and surface reaction colimited process. The maximum power density of the LSFM single cell reaches 1156 mW cm–2 at 800 °C within humidified H2. The new ceramic material LSFM is a promising anode for high performance solid oxide fuel cells.

show abstract

Section: Results and Discussionmentioning

confidence: 69%

Section: Electrical Conductivity During Redox Cyclingmentioning

confidence: 99%

Reduced Thermal Expansion and Enhanced Redox Reversibility of La_0.5Sr_1.5Fe_1.5Mo_0.5O_6−δAnode Material for Solid Oxide Fuel Cells

Thomas

et al. 2019

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

“…The results also suggest that the sol-gel method is able to effectively fabricate more uniform two-phase or multi-phase powders with micrometre or even nanometre-sized particles compared with traditional method of physical mixing. 38,39 Furthermore, Fig. 5e shows the voltage of STFN@GDC and STFN anode cells as function of testing time, operated under a constant current density of 240 mA cm −2 at 750 °C, further confirming the excellent stability of STFN@GDC anode.…”

Section: H2mentioning

confidence: 62%

Sr(Ti,Fe)O_3−δ Based Intermediate Temperature Solid Oxide Fuel Cell Anode with Self-precipitated (Ni,Fe) and Gd_0.1Ce_0.9O_2−δ Nano Particles

Chen¹,

Zhu²,

Chen³

et al. 2020

J. Electrochem. Soc.

View full text Add to dashboard Cite

We report an optimized Sr0.95Ti0.35Fe0.6Ni0.05O3−δ (STFN) anode in electrolyte supported single cell, which exhibits high stability and fine electrochemical catalytic activity in 3% H2O-97% H2 at 750 °C, with exsolved Ni0.4Fe0.6 nano particles and stoichiometric-close composition of AB0.924O3−δ after exsolution. In order to bring perovskite anode into application, mixtures of STFN and Gd0.1Ce0.9O1.95 (GDC), prepared by physical and sol-gel method, are applied as anode functional layer in electrolyte supported single cells. Further studies reveal that the composite anode prepared by adding GDC to STFN can improve anode performance at intermediate and low temperatures by decreasing anode polarization resistance ( R p , A ) dependence in diluted fuels. The sol-gel method is shown to effectively fabricate uniformly dispersed multi-phase anode, compared with STFN anode, with decreased R p , A of 0.089 Ω·cm2 for STFN@GDC anode at 750 °C and p H 2 = 0.97 atm . Moreover, the single cell also demonstrates good performance under both H2 and H2–CO.

show abstract

“…In addition to the above, another effective method is adding a second phase to form a composite to compensate for the shortage of raw material, such as Sr 2 Fe 1.5 Mo 0.4 Nb 0.1 O 6 –Sm 0.2 Ce 0.8 O 2 , PrNi 0.5 Mn 0.5 O 3 –PrO x , and La 0.8 Sr 0.2 CoO 3 –(La 0.5 Sr 0.5 ) 2 CoO 4 . Among them, the heterointerface generated between RP-phase and perovskite materials has a promoting effect on a series of reactions of oxygen at the cathode, which attracts attention.…”

Section: Introductionmentioning

confidence: 99%

Construction of Heterointerfaces with Enhanced Oxygen Reduction Kinetics for Intermediate-Temperature Solid Oxide Fuel Cells

Sui

Ren

et al. 2019

ACS Appl. Energy Mater.

Self Cite

View full text Add to dashboard Cite

The intermediate temperature solid oxide fuel cells (IT-SOFCs) whose operating temperature ranges from 873 K to 1073 K have attracted a lot of attention in recent years because of their decreased cost, improved efficiency, and increased turn on/off switch speed. Nevertheless, the reduced performance of the cathode when operating at the intermediate temperature range becomes a challenge, due to the reduced catalytic activity for oxygen reduction reaction (ORR) on traditional cathode materials. Ideal cathodes are required to present efficient charge and oxygen transfer processes. Herein, by constructing heterointerfaces, we designed a novel composite cathode material PrSrFe0.5Co0.5O4–Pr0.4Sr0.6Fe0.5Co0.5O3 (PSFC214–113). According to the X-ray diffraction patterns and high-resolution transmission electron microscopy, the PSFC214–113 composite material has been synthesized successfully. As a SOFC cathode, PSFC214–113 maintains a high electronic conductivity and excellent chemical compatibility. Compared to single-phase materials, PSFC214–113 showed significantly lower electrochemical impedance spectroscopy values and the peak power density of cell reached a power density of 0.73 W cm–2. The presence of heterointerfaces promoted electronic and oxygen migration which, in turn, enhanced the oxygen reduction kinetics and provided superior electrochemical performance to the material. Our results reveal that the construction of heterointerfaces is an effective strategy to enhance the oxygen reduction kinetics for the high-activity cathode.

show abstract

Improved electrochemical performance of Sr 2 Fe 1.5 Mo 0.4 Nb 0.1 O 6−δ –Sm 0.2 Ce 0.8 O 2−δ composite cathodes by a one-pot method for intermediate temperature solid oxide fuel cells

Cited by 10 publications

References 37 publications

Reduced Thermal Expansion and Enhanced Redox Reversibility of La_0.5Sr_1.5Fe_1.5Mo_0.5O_6−δAnode Material for Solid Oxide Fuel Cells

Reduced Thermal Expansion and Enhanced Redox Reversibility of La_0.5Sr_1.5Fe_1.5Mo_0.5O_6−δAnode Material for Solid Oxide Fuel Cells

Sr(Ti,Fe)O_3−δ Based Intermediate Temperature Solid Oxide Fuel Cell Anode with Self-precipitated (Ni,Fe) and Gd_0.1Ce_0.9O_2−δ Nano Particles

Construction of Heterointerfaces with Enhanced Oxygen Reduction Kinetics for Intermediate-Temperature Solid Oxide Fuel Cells

Contact Info

Product

Resources

About

Improved electrochemical performance of Sr 2 Fe 1.5 Mo 0.4 Nb 0.1 O 6−δ –Sm 0.2 Ce 0.8 O 2−δ composite cathodes by a one-pot method for intermediate temperature solid oxide fuel cells

Cited by 10 publications

References 37 publications

Reduced Thermal Expansion and Enhanced Redox Reversibility of La0.5Sr1.5Fe1.5Mo0.5O6−δAnode Material for Solid Oxide Fuel Cells

Reduced Thermal Expansion and Enhanced Redox Reversibility of La0.5Sr1.5Fe1.5Mo0.5O6−δAnode Material for Solid Oxide Fuel Cells

Sr(Ti,Fe)O3−δ Based Intermediate Temperature Solid Oxide Fuel Cell Anode with Self-precipitated (Ni,Fe) and Gd0.1Ce0.9O2−δ Nano Particles

Construction of Heterointerfaces with Enhanced Oxygen Reduction Kinetics for Intermediate-Temperature Solid Oxide Fuel Cells

Contact Info

Product

Resources

About

Reduced Thermal Expansion and Enhanced Redox Reversibility of La_0.5Sr_1.5Fe_1.5Mo_0.5O_6−δAnode Material for Solid Oxide Fuel Cells

Reduced Thermal Expansion and Enhanced Redox Reversibility of La_0.5Sr_1.5Fe_1.5Mo_0.5O_6−δAnode Material for Solid Oxide Fuel Cells

Sr(Ti,Fe)O_3−δ Based Intermediate Temperature Solid Oxide Fuel Cell Anode with Self-precipitated (Ni,Fe) and Gd_0.1Ce_0.9O_2−δ Nano Particles