La2NiO4+δ (LNO), oxygen electrode, electrochemical performance, reversible solid oxide cells (RSOCs)
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.
Tsinghua University Press
Pengzhang LI, Wei YANG, Chuanjin TIAN, Wenyan ZHAO, Zhe LÜ, Zhipeng XIE, Chang-An WANG. Electrochemical performance of La2NiO4+δ-Ce0.55La0.45O2-δ as a promising bifunctional oxygen electrode for reversible solid oxide cells. Journal of Advanced Ceramics 2021, 10(2): 328-337.