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Porous an hollow nanofibers for solid oxide fuel cell electrodes

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Abstract

Among the diverse approaches for improving the electrode performance of solid oxide fuel cells operating at intermediate temperatures, the use of nanofiber-based electrodes has provided large improvement owing to their large specific surface area, continuous conduction pathway, and highly porous structure. However, the low thermal stability at increased temperature often limits the process compatibility and sustainability during operation. In this study, we fabricated nanofiber-based electrodes with a high porosity and hollow shape using one-step electrospinning with a hydrogel polymer, which exhibited largely improved performance and excellent thermal stability. A porous-nanofiber-based cell exhibits a polarization resistance of 0.021 Ωcm2 and maximum power density of 1.71 W/cm2 at 650 °C, which is an improvement of 34.3% and 14.7% compared to that of a solid-nanofiber-based cell, respectively. Comprehensive analyses of the microstructures and chemistry indicate that the performance increase is mainly attributable to the enhanced surface oxygen exchange reactions owing to the extended reaction sites with lower energy barriers by the high porosity and enriched oxygen vacancies in the nanofibers.

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Abbreviations

Ea :

activation energy [eV]

Ea, o :

activation energy for the ohmic resistance [eV]

Ea, p :

activation energy for the polarization resistance [eV]

Ea, t :

activation energy for the total resistance [eV]

Ro :

ohmic resistance [Ωcm2]

Rp :

polarization resistance [Ωcm2]

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Acknowledgements

This research was supported by the Basic Science Research Program through the National Research Foundation (NRF) grant funded by the Korea government (MSIP), and Future Planning (Grant No. 2019R1A2C4070158, 2017R1E1A1A01075353), by the Global Frontier R&D program on Center for Multiscale Energy System funded by the NRF under the Ministry of Science, ICT, and Future Planning, Korea (Grant No. NRF-2014M3A6A7074784), and by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20173010032170), and by the Technology Development Program to Solve Climate Changes (2017M1A2A2044927).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Sungkyunkwan University, Suwon, 16419, Korea

    Minwoo Ahn, Sangyeon Hwang, Seungwoo Han, Mingi Choi, Doyoung Byun & Wonyoung Lee

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  1. Minwoo Ahn
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  2. Sangyeon Hwang
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Correspondence to Doyoung Byun or Wonyoung Lee.

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Ahn, M., Hwang, S., Han, S. et al. Porous an hollow nanofibers for solid oxide fuel cell electrodes. Korean J. Chem. Eng. 37, 1371–1378 (2020). https://doi.org/10.1007/s11814-020-0610-6

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  • DOI: https://doi.org/10.1007/s11814-020-0610-6

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