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

54 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

UN SDGs

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",

month = may,

day = "31",

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

language = "English",

volume = "459",

journal = "Journal of Power Sources",

issn = "0378-7753",

publisher = "Elsevier B.V.",

}

TY - JOUR

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

UR - http://www.scopus.com/inward/record.url?scp=85082185421&partnerID=8YFLogxK

U2 - 10.1016/j.jpowsour.2020.228017

DO - 10.1016/j.jpowsour.2020.228017

M3 - Article

AN - SCOPUS:85082185421

SN - 0378-7753

VL - 459

JO - Journal of Power Sources

JF - Journal of Power Sources

M1 - 228017

ER -