<trans-title xml:lang="en">Pr1+xBa1-xFe2O5+δ Cathode Materials for Solid Oxide Fuel Cells: Preparation and Electrochemical Performance </trans-title>

Ke XUE; Changkun CAI; Manyi XIE; Shuting LI; Shengli AN

doi:10.15541/jim20240404

Journal of Inorganic Materials, Volume. 40, Issue 4, 363(2025)

Pr₁₊_xBa_1-_xFe₂O₅₊_δ Cathode Materials for Solid Oxide Fuel Cells: Preparation and Electrochemical Performance

Ke XUE^1,2,3, Changkun CAI^1,2,3, Manyi XIE^1,2,3, Shuting LI^1,2,3, and Shengli AN^1,2,3、*

Author Affiliations

¹1. School of Rare Earth Industry, Inner Mongolia University of Science and Technology, Baotou 014010, China

²2. Inner Mongolia Key Laboratory of Advanced Ceramic Materials and Devices, Inner Mongolia University of Science and Technology, Baotou 014010, China

³3. Key Laboratory of Green Extraction & Efficient Utilization of Light Rare-Earth Resources, Ministry of Education, Inner Mongolia University of Science and Technology, Baotou 014010, China

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Figures & Tables(18)

S1. Rietveld refinement plots of room-temperature XRD for (a) PBF, (b) PBF_0.01, (c) PBF_0.02, and (d) PBF_0.04 powders

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1. XRD analysis of samples PBF and PBF_x

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S2. ECR curves of PBF_x samples within 600-800 ℃, along with the oxygen surface exchange coefficient Ko and oxygen diffusion coefficient Do

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2. XPS spectra of cathode materials PBF and PBF_x

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3. Electrical conductivity analysis of samples PBF and PBF_x

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S3. Cross-sectional SEM images of Ni-SDC|SDC|PBF_0.01 single cell after test

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4. EIS spectra of PBF_x|SDC|PBF_x symmetric cells

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5. Impedance testing of PBF_x|SDC|PBF_x symmetric cells over 50 h

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6. I-V-P curves of single cells for Ni-SDC|SDC|PBF_x

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7. EIS spectra of PBF, PBF_0.01, PBF_0.02, and PBF_0.04 single cells at 800 ℃

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Table 1. Rietveld refinement results of room temperature XRD for PBF and PBF_x powders
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Table 1. Rietveld refinement results of room temperature XRD for PBF and PBF_x powders
Sample a/nm b/nm c/nm V/nm³ R_wp χ²
PBF 0.3930 0.3930 0.7858 0.121383 0.059 4.789
PBF_0.01 0.3929 0.3929 0.7867 0.121443 0.073 3.788
PBF_0.02 0.3929 0.3929 0.7865 0.121436 0.066 5.961
PBF_0.04 0.3929 0.3929 0.7864 0.121398 0.071 6.691

Table 1. Lattice strain, lattice dislocation density and specific values of the parameters used in this study
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Table 1. Lattice strain, lattice dislocation density and specific values of the parameters used in this study
Sample 2θ/rad β_hkl/rad D_hkl/nm ε^SH δ^SH/(×10¹⁸, m^-2)
PBF 0.56148 0.077 2.7789 0.0667 2.5404
PBF_0.01 0.56138 0.082 2.7782 0.0711 2.7067
PBF_0.02 0.56131 0.081 2.7782 0.0702 2.6738
PBF_0.02 0.56135 0.076 2.7782 0.0659 2.5087

Table 2. Average binding energies of PBF and 0.01 (in molar) excessive Pr at different substitutional positions in PBF lattice
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Table 2. Average binding energies of PBF and 0.01 (in molar) excessive Pr at different substitutional positions in PBF lattice
E_av/(eV·atom^-1) PBF Ba site Fe site Interstitial site (Ba) Interstitial site (Pr)
-9.831 -9.733 -9.422 -19.605 -18.511

Table 2. Polarization resistance of symmetric cells for PBF, PBF_0.01, PBF_0.02, and PBF_0.04

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Table 2. Polarization resistance of symmetric cells for PBF, PBF_0.01, PBF_0.02, and PBF_0.04

Sample	T/℃	R₁/(Ω•cm²)	R₂/(Ω•cm²)
PBF	650	0.035	0.269
	700	0.018	0.050
	750	0.013	0.009
	800	0.008	0.007
PBF_0.01	650	0.075	0.305
	700	0.039	0.052
	750	0.020	0.008
	800	0.010	0.007
PBF_0.02	650	0.063	0.277
	700	0.035	0.047
	750	0.019	0.006
	800	0.009	0.006
PBF_0.04	650	0.050	0.260
	700	0.033	0.042
	750	0.017	0.004
	800	0.008	0.003

Table 3. Contents of Pr³⁺/Pr⁴⁺, Fe³⁺/Fe⁴⁺, O_lat/O_ads, and Ba_lat/Ba_sur on the surfaces of cathode materials PBF and PBF_x
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Table 3. Contents of Pr³⁺/Pr⁴⁺, Fe³⁺/Fe⁴⁺, O_lat/O_ads, and Ba_lat/Ba_sur on the surfaces of cathode materials PBF and PBF_x
Sample Fe O Ba Pr
Fe³⁺ Fe⁴⁺ O_lat O_ads Ba_lat Ba_sur Pr³⁺ Pr⁴⁺
PBF 0.54 0.46 0.37 0.63 0.34 0.66 0.34 0.66
PBF_0.01 0.73 0.27 0.39 0.61 0.46 0.54 0.43 0.57
PBF_0.02 0.65 0.35 0.38 0.62 0.44 0.56 0.41 0.59
PBF_0.04 0.59 0.41 0.36 0.64 0.41 0.59 0.40 0.60

Table 3. Activation energies (E_a/eV) of surface oxygen exchange and oxygen diffusion
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Table 3. Activation energies (E_a/eV) of surface oxygen exchange and oxygen diffusion
PBF PBF_0.01 PBF_0.02 PBF_0.04
Surface oxygen exchange 0.90 1.32 0.92 0.99
Oxygen diffusion 0.90 1.16 0.98 1.06

Table 4. Comparison of conductivity, ASR and peak power density of PBF with other SOFC cathode materials^[S3-S9]

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Table 4. Comparison of conductivity, ASR and peak power density of PBF with other SOFC cathode materials^[S3-S9]

Cathode material	Conductivityat 800 ℃/(S·cm^-1)	ASR at 800 ℃/(Ω·cm²)	Peak power densityat 800 ℃/(W•cm^-2)	Ref.
PrBaFe₂O₅₊_δ	31.4	0.015	0.462	This work
Pr_1.01Ba_0.99Fe₂O₅₊_δ	52.3	0.017	0.690	This work
PrBaFe_1.2Ni_0.8O₅₊_δ	~79.0	-	-	[10]
PrBaFe_1.9Zn_0.1O₅₊_δ	~32.0	0.031(750 ℃)	1.060(750 ℃)	[12]
PrBaFe_1.8Co_0.2O₅₊_δ	~23.0	0.019	0.734(850 ℃)	[11]
PrBaFe_1.9Ga_0.1O₅₊_δ	~45.0	0.021	0.856	[S3]
PrBaFe_1.9Mo_0.1O₅₊_δ	~18.0	0.046	0.680	[S4]
GdBa_0.5Sr_0.5Co_0.9Cu_1.1O₅₊_δ	~22.0	0.017(850 ℃)	1.060	[S5]
Sr₂Fe_1.5Mo_0.4In_0.1O_6-_δ	~26.0	0.023	1.470	[S6]
Sr₂Co_1.5Fe_0.4Ta_0.1O₅₊_δ	~12.0	0.030(700 ℃)	0.656(700 ℃)	[S7]
NdBa_0.9Ca_0.1Co₂O₅₊_δ	~490.0	0.048	1.286	[S8]
PrBaCo₂O₅₊_δ	~670.0	0.026	1.088	[S9]

Table 4. Fe-O bond lengths of PBF and PBF_x
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Table 4. Fe-O bond lengths of PBF and PBF_x
Sample L₁/nm L₂/nm L₃/nm
PBF 0.1847 0.1981 0.1810
PBF_0.01 0.2833 0.1786 0.2083
PBF_0.02 0.2829 0.1787 0.2079
PBF_0.04 0.2809 0.1792 0.2061

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Ke XUE, Changkun CAI, Manyi XIE, Shuting LI, Shengli AN. Pr₁₊_xBa_1-_xFe₂O₅₊_δ Cathode Materials for Solid Oxide Fuel Cells: Preparation and Electrochemical Performance [J]. Journal of Inorganic Materials, 2025, 40(4): 363

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Paper Information

Category:

Received: Sep. 9, 2024

Accepted: --

Published Online: Sep. 2, 2025

The Author Email: Shengli AN (shengli_an@126.com)

DOI:10.15541/jim20240404

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Rietveld refinement results of room temperature XRD for PBF and PBFx powders

Table 1. Rietveld refinement results of room temperature XRD for PBF and PBFx powders

Table 1. Lattice strain, lattice dislocation density and specific values of the parameters used in this study

Table 1. Lattice strain, lattice dislocation density and specific values of the parameters used in this study

Table 2. Average binding energies of PBF and 0.01 (in molar) excessive Pr at different substitutional positions in PBF lattice

Table 2. Average binding energies of PBF and 0.01 (in molar) excessive Pr at different substitutional positions in PBF lattice

Table 2. Polarization resistance of symmetric cells for PBF, PBF0.01, PBF0.02, and PBF0.04

Table 2. Polarization resistance of symmetric cells for PBF, PBF0.01, PBF0.02, and PBF0.04

Table 3. Contents of Pr3+/Pr4+, Fe3+/Fe4+, Olat/Oads, and Balat/Basur on the surfaces of cathode materials PBF and PBFx

Table 3. Contents of Pr3+/Pr4+, Fe3+/Fe4+, Olat/Oads, and Balat/Basur on the surfaces of cathode materials PBF and PBFx

Table 3. Activation energies (Ea/eV) of surface oxygen exchange and oxygen diffusion

Table 3. Activation energies (Ea/eV) of surface oxygen exchange and oxygen diffusion

Table 4. Comparison of conductivity, ASR and peak power density of PBF with other SOFC cathode materials[S3-S9]

Table 4. Comparison of conductivity, ASR and peak power density of PBF with other SOFC cathode materials[S3-S9]

Table 4. Fe-O bond lengths of PBF and PBFx

Table 4. Fe-O bond lengths of PBF and PBFx

Table 1. Rietveld refinement results of room temperature XRD for PBF and PBF_x powders

Table 1. Rietveld refinement results of room temperature XRD for PBF and PBF_x powders

Table 2. Polarization resistance of symmetric cells for PBF, PBF_0.01, PBF_0.02, and PBF_0.04

Table 2. Polarization resistance of symmetric cells for PBF, PBF_0.01, PBF_0.02, and PBF_0.04

Table 3. Contents of Pr³⁺/Pr⁴⁺, Fe³⁺/Fe⁴⁺, O_lat/O_ads, and Ba_lat/Ba_sur on the surfaces of cathode materials PBF and PBF_x

Table 3. Contents of Pr³⁺/Pr⁴⁺, Fe³⁺/Fe⁴⁺, O_lat/O_ads, and Ba_lat/Ba_sur on the surfaces of cathode materials PBF and PBF_x

Table 3. Activation energies (E_a/eV) of surface oxygen exchange and oxygen diffusion

Table 3. Activation energies (E_a/eV) of surface oxygen exchange and oxygen diffusion

Table 4. Comparison of conductivity, ASR and peak power density of PBF with other SOFC cathode materials^[S3-S9]

Table 4. Comparison of conductivity, ASR and peak power density of PBF with other SOFC cathode materials^[S3-S9]

Table 4. Fe-O bond lengths of PBF and PBF_x

Table 4. Fe-O bond lengths of PBF and PBF_x