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In this work, La2NiO4+δ-xCe0.55La0.45O2-δ (denoted as LNO-xLDC) with various LDC contents (x = 0, 10, 20, 30, and 40 wt%) were prepared and evaluated as bifunctional oxygen electrodes for reversible solid oxide cells (RSOCs). Compared with the pure LNO, the optimum composition of LNO-30LDC exhibited the lowest polarization resistance (Rp) of 0.53 and 0.12 Ω·cm2 in air at 650 and 750 ℃, respectively. The enhanced electrochemical performance of LNO-30LDC oxygen electrode was mainly attributed to the extended triple phase boundary and more oxygen ionic transfer channels. The hydrogen electrode supported single cell with LNO-30LDC oxygen electrode displayed peak power densities of 276, 401, and 521 mW·cm-2 at 700, 750, and 800 ℃, respectively. Moreover, the electrolysis current density of the single cell demonstrated 526.39 mA·cm-2 under 1.5 V at 800 ℃, and the corresponding hydrogen production rate was 220.03 mL·cm-2·h-1. The encouraging results indicated that LNO-30LDC was a promising bifunctional oxygen electrode material for RSOCs.


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Electrochemical performance of La2NiO4+δ-Ce0.55La0.45O2-δ as a promising bifunctional oxygen electrode for reversible solid oxide cells

Show Author's information Pengzhang LIa( )Wei YANGaChuanjin TIANaWenyan ZHAOaZhe LÜbZhipeng XIEa,cChang-An WANGa,c
School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, China
School of Physics, Harbin Institute of Technology, Harbin 150001, China
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Abstract

In this work, La2NiO4+δ-xCe0.55La0.45O2-δ (denoted as LNO-xLDC) with various LDC contents (x = 0, 10, 20, 30, and 40 wt%) were prepared and evaluated as bifunctional oxygen electrodes for reversible solid oxide cells (RSOCs). Compared with the pure LNO, the optimum composition of LNO-30LDC exhibited the lowest polarization resistance (Rp) of 0.53 and 0.12 Ω·cm2 in air at 650 and 750 ℃, respectively. The enhanced electrochemical performance of LNO-30LDC oxygen electrode was mainly attributed to the extended triple phase boundary and more oxygen ionic transfer channels. The hydrogen electrode supported single cell with LNO-30LDC oxygen electrode displayed peak power densities of 276, 401, and 521 mW·cm-2 at 700, 750, and 800 ℃, respectively. Moreover, the electrolysis current density of the single cell demonstrated 526.39 mA·cm-2 under 1.5 V at 800 ℃, and the corresponding hydrogen production rate was 220.03 mL·cm-2·h-1. The encouraging results indicated that LNO-30LDC was a promising bifunctional oxygen electrode material for RSOCs.

Keywords:

La2NiO4+δ (LNO), oxygen electrode, electrochemical performance, reversible solid oxide cells (RSOCs)
Received: 31 July 2020 Revised: 29 November 2020 Accepted: 14 December 2020 Published: 06 February 2021 Issue date: April 2021
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Publication history

Received: 31 July 2020
Revised: 29 November 2020
Accepted: 14 December 2020
Published: 06 February 2021
Issue date: April 2021

Copyright

© The Author(s) 2020

Acknowledgements

The authors gratefully acknowledge financial support from the Science and Technology Project of Jiangxi Provincial Education Department (GJJ190734) and the National Natural Science Foundation of China (51962015).

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