Effectively Improving the Electrocatalytic Activity of PrBaMn2O5+δ Anode by Doping Co， Ni and Fe

doi:10.19894/j.issn.1000-0518.220048

Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (10): 1543-1553.DOI: 10.19894/j.issn.1000-0518.220048

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Effectively Improving the Electrocatalytic Activity of PrBaMn₂O₅₊_δ Anode by Doping Co， Ni and Fe

Ya-Wei TANG¹^,², Lan-Lan XU¹, Xiao-Juan LIU¹^,²()

^1.State Key Laboratory of Rare Earth Resource Utilization，Changchun Institute of Applied Chemistry，Chinese Academy of Sciences，Changchun 130022，China
^2.University of Science and Technology of China，Hefei 230026，China

Received:2022-02-22 Accepted:2022-04-27 Published:2022-10-01 Online:2022-10-05
Contact: Xiao-Juan LIU
About author:lxjuan@ciac.ac.cn
Supported by:
the China Academy of Engneering Phycics NSAF Joiut Fund of National Natural Science Foundation of China(U2130114)

Abstract

Abstract:

The development of efficient anode materials plays an important role in the large-scale commercialization of solid oxide fuel cell （SOFC）. Based on the design concept of component engineering， PrBaMn_1.6X_0.4O₅₊_δ （PBMX，X = Co，Ni，Fe） layered perovskite anodes are synthesized by simple B-site doping transition metals into Pr_0.5Ba_0.5MnO_3-_δ . The effect of doping with different transition metals on the microstructure and electrochemical properties of PrBaMn₂O₅₊_δ_{（PBMO） is systematically investigated， and the effect of A-site defects on the PBMX anodes is further analyzed. The results show that the doping effect of Co and Ni is obviously better than that of Fe， PrBaMn_1.6Co_0.4O₅₊_δ （PBMC） and PrBaMn_1.6Ni_0.4O₅₊_δ （PBMN） will generate more oxygen vacancies during the reduction process， and the electrochemical properties of the materials are better. Among them， PBMC has the highest catalytic activity as an anode material， with a polarization resistance of 0.170 Ω·cm² and a peak power density of 874 mW/cm² at 800 ℃ in H₂， showing that the enhancement of the electrochemical activity is due to the enhancement of the surface roughness and the increase of oxygen vacancies. In addition， the introduction of A-site deficiency can improve the performance of PBMX， the polarization resistance of P0.6BMC is only 0.090 Ω·cm² and the peak power density is 952 mW/cm² at 800 ℃.}

Key words: Element-doped, Surface oxygen vacancy, Solid oxide fuel cell, Anode

CLC Number:

O643.3

Ya-Wei TANG, Lan-Lan XU, Xiao-Juan LIU. Effectively Improving the Electrocatalytic Activity of PrBaMn₂O₅₊_δ Anode by Doping Co， Ni and Fe[J]. Chinese Journal of Applied Chemistry, 2022, 39(10): 1543-1553.

Figures/Tables 11

Fig.1 （A）XRD patterns of Pr0.5Ba0.5Mn0.8X0.2O3-δ anode materials and （B） those reduced at 650 ℃ in 5% H2/Ar

Fig.2 SEM images of Pr0.5Ba0.5Mn0.8X0.2O3-δ before and after reduction at 800 ℃ for 2 h in H2， PBMC （A， E）， PBMN （B， F）， PBMF （C， G） and PBMO （D， H）

Fig.3 XPS spectra of O1s for the PBMC， PBMN， PBMF and PBMO

Table 1 Proportion of Olattice andOnonlattice of PBMC， PBMN， PBMF and PBMO

样品 Sample	晶格氧面积 Area of O_lattice	非晶格氧面积 Area of O_nonlattice	非晶格氧的占比 O_nolattice/（O_nonlattice+O_lattice）/%
PBMC	18 617.49	21 489.18	53.58
PBMN	19 596.53	22 957.11	53.18
PBMF	20 224.41	21 626.43	51.60
PBMO	37 951.47	14 066.15	27.04

Fig.4 （A-D）EIS spectra of PBMC， PBMN， PBMF and PBMO in humidified H2 at different temperature，（E）comparison of the ASRs and （F）corresponding Arrhenius plots

Fig.5 （A） Cross-sectional SEM image of single cell with PBMC after being electrochemical tested，（B-E） typical I?V?P curves of the single cells in wet H2 at various temperatures and （F） the comparison of peak power densities

Fig.6 （A）XRD patterns of Pr0.3 Ba0.5Mn0.8X0.2O3-δ anode materials and （B） those reduced at 650 ℃ in 5% H2/Ar

Fig.7 XPS spectra of O1s for the P0.6BMC， P0.6BMN， P0.6BMF and P0.6BMO

Table 2 Proportion of Olattice andOnonlattice of P0.6BMC， P0.6BMN， P0.6BMF and P0.6BMO

样品 Sample	晶格氧面积 Area of O_lattice	非晶格氧面积 Area of O_nonlattice	非晶格氧的占比 O_nolattice/（O_nonlattice+O_lattice）（%）
P0.6BMC	26 296.69	78 212.60	74.84
P0.6BMN	30 872.16	89 567.72	74.37
P0.6BMF	40 258.33	64 907.88	61.72
P0.6BMO	64 458.21	49 644.89	43.51

Fig.8 （A-C）EIS spectra of P0.6BMC， P0.6BMN and P0.6BMF in H2 at different temperature and （D） comparison of the ASRs

Fig.9 （A-D） I?V?P curves of P0.6BMX│SDC│LSGM│LSCF single cells in wet H2

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Effectively Improving the Electrocatalytic Activity of PrBaMn₂O₅₊_δ Anode by Doping Co， Ni and Fe

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