Electrochemical performance of La2NiO4+δ-Ce0.55La0.45O2−δ as a promising bifunctional oxygen electrode for reversible solid oxide cells
Pengzhang Li, Wei Yang, Chuanjin Tian, Wenyan Zhao, Zhe Lü, Zhipeng Xie, Chang‐An Wang
Abstract
Abstract In this work, La 2 NiO 4+ δ - x Ce 0.55 La 0.45 O 2− δ (denoted as LNO- x LDC) 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 ( R p ) of 0.53 and 0.12 Ω·cm 2 in air at 650 and 750 °C, 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 °C, respectively. Moreover, the electrolysis current density of the single cell demonstrated 526.39 mA·cm −2 under 1.5 V at 800 °C, 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.