Probing oxygen vacancy effect on oxygen reduction reaction of the NdBaCo2O5+δ cathode for solid oxide fuel cells

Chengzhi Sun; Yu Kong; Lin Shao; Kening Sun; Naiqing Zhang

doi:10.1016/j.jpowsour.2020.228017

Probing oxygen vacancy effect on oxygen reduction reaction of the NdBaCo₂O_5+δ cathode for solid oxide fuel cells

Chengzhi Sun, Yu Kong, Lin Shao, Kening Sun, Naiqing Zhang^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

53 Citations (Scopus)

Abstract

In this work, abundant oxygen vacancies are introduced into NdBaCo₂O_5+δ (NBCO) by partial substitution of cobalt to facilitate the electrochemical activity of ORR. The oxygen vacancy concentration of NdBaCo_1.8Sc_0.2O_5+δ (NBCSc-2) is more than twice as that of NdBaCo₂O_5+δ. The increased oxygen surface exchange, bulk diffusion coefficients and adequate conductivity for NBCSc-2 can be responsible for the decrease of oxygen ion transfer activation energy. Consequently, the NBCSc-2 cathode shows a significantly reduced polarization impedance of 0.035 Ω cm² at 700 °C, which is only about 35% of NBCO. We also investigate the influence of the doping strategy on the stability of cathode. Thus, the enhanced ORR kinetics and high durability make NBCSc-2 as potential cathode material for solid oxide fuel cells.

Original language	English
Article number	228017
Journal	Journal of Power Sources
Volume	459
DOIs	https://doi.org/10.1016/j.jpowsour.2020.228017
Publication status	Published - 31 May 2020
Externally published	Yes

Keywords

Oxygen bulk diffusion coefficient
Oxygen surface exchange coefficient
Oxygen vacancy
SOFC cathode

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This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.jpowsour.2020.228017

Cite this

@article{5d085a1141e3411aa854cccbfb0b38d6,

title = "Probing oxygen vacancy effect on oxygen reduction reaction of the NdBaCo2O5+δ cathode for solid oxide fuel cells",

abstract = "In this work, abundant oxygen vacancies are introduced into NdBaCo2O5+δ (NBCO) by partial substitution of cobalt to facilitate the electrochemical activity of ORR. The oxygen vacancy concentration of NdBaCo1.8Sc0.2O5+δ (NBCSc-2) is more than twice as that of NdBaCo2O5+δ. The increased oxygen surface exchange, bulk diffusion coefficients and adequate conductivity for NBCSc-2 can be responsible for the decrease of oxygen ion transfer activation energy. Consequently, the NBCSc-2 cathode shows a significantly reduced polarization impedance of 0.035 Ω cm2 at 700 °C, which is only about 35% of NBCO. We also investigate the influence of the doping strategy on the stability of cathode. Thus, the enhanced ORR kinetics and high durability make NBCSc-2 as potential cathode material for solid oxide fuel cells.",

keywords = "Oxygen bulk diffusion coefficient, Oxygen surface exchange coefficient, Oxygen vacancy, SOFC cathode",

author = "Chengzhi Sun and Yu Kong and Lin Shao and Kening Sun and Naiqing Zhang",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

year = "2020",

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day = "31",

doi = "10.1016/j.jpowsour.2020.228017",

language = "English",

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journal = "Journal of Power Sources",

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T1 - Probing oxygen vacancy effect on oxygen reduction reaction of the NdBaCo2O5+δ cathode for solid oxide fuel cells

AU - Sun, Chengzhi

AU - Kong, Yu

AU - Shao, Lin

AU - Sun, Kening

AU - Zhang, Naiqing

PY - 2020/5/31

Y1 - 2020/5/31

N2 - In this work, abundant oxygen vacancies are introduced into NdBaCo2O5+δ (NBCO) by partial substitution of cobalt to facilitate the electrochemical activity of ORR. The oxygen vacancy concentration of NdBaCo1.8Sc0.2O5+δ (NBCSc-2) is more than twice as that of NdBaCo2O5+δ. The increased oxygen surface exchange, bulk diffusion coefficients and adequate conductivity for NBCSc-2 can be responsible for the decrease of oxygen ion transfer activation energy. Consequently, the NBCSc-2 cathode shows a significantly reduced polarization impedance of 0.035 Ω cm2 at 700 °C, which is only about 35% of NBCO. We also investigate the influence of the doping strategy on the stability of cathode. Thus, the enhanced ORR kinetics and high durability make NBCSc-2 as potential cathode material for solid oxide fuel cells.

AB - In this work, abundant oxygen vacancies are introduced into NdBaCo2O5+δ (NBCO) by partial substitution of cobalt to facilitate the electrochemical activity of ORR. The oxygen vacancy concentration of NdBaCo1.8Sc0.2O5+δ (NBCSc-2) is more than twice as that of NdBaCo2O5+δ. The increased oxygen surface exchange, bulk diffusion coefficients and adequate conductivity for NBCSc-2 can be responsible for the decrease of oxygen ion transfer activation energy. Consequently, the NBCSc-2 cathode shows a significantly reduced polarization impedance of 0.035 Ω cm2 at 700 °C, which is only about 35% of NBCO. We also investigate the influence of the doping strategy on the stability of cathode. Thus, the enhanced ORR kinetics and high durability make NBCSc-2 as potential cathode material for solid oxide fuel cells.

KW - Oxygen bulk diffusion coefficient

KW - Oxygen surface exchange coefficient

KW - Oxygen vacancy

KW - SOFC cathode

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