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Ionic conducting properties and fuel cell performance developed by band structures

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journal contribution
posted on 26.03.2019, 14:28 by K. Sivajee Ganesh, Baoyuan Wang, Jung-Sik Kim, Bin Zhu
: The layer-structure transition-metal oxides have good triple H+ / O2−/e− charge transport which can promote redox reactions and enhance fuel cell performance. This work has developed ionic transport property based on the layer-structure LiCoO2 (LCO) by tuning the energy band structure with Mg doping also applied for the electrolyte in high-performance lowtemperature solid oxide fuel cells (LT-SOFCs). Mg-doped LiCoO2 exhibited a hexagonal-layered structure with the R3m space group. By doping LiCoO2, its band gap was reduced from 2.65 to 2.24 eV. Electrochemical impedance analysis revealed that Mg-doped LCO (LMCO) significantly reduces the polarization loss (charge-transfer resistance) from 0.85 to 0.5 Ω cm2 at 600 °C; the power output of the fuel cell devices improved from 0.5 to 0.7 W/cm2 , resulting also in better operation durability. Various characterizations on structural and electrochemical properties were conducted. The mechanism was further discussed in relation with the band structure

Funding

The authors thank the financial support from the National Natural Science Foundation of China (grant 51772080 and 51502084), the Swedish Research Council (VR, contract no. 621-2011-4983), and the EC FP7 TriSOFC project (contract no. 303454).

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

The Journal of Physical Chemistry C

Volume

123

Issue

14

Pages

8569–8577

Citation

GANESH, K.S. ... et al., 2019. Ionic conducting properties and fuel cell performance developed by band structures. The Journal of Physical Chemistry C, 123 (14), pp.8569–8577.

Publisher

© American Chemical Society (ACS)

Version

AM (Accepted Manuscript)

Publisher statement

This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpcc.8b11914

Publication date

2019-02-05

ISSN

1932-7447

eISSN

1932-7455

Language

en

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Keywords

Exports