A triple (e~- /O~(2-)/H~+) conducting perovskite BaCo_(0.4)Fe_(0.4)Zr_(0.1)Y_(0.1)O_(3-δ) for low temperature solid oxide fuel cell

摘要

Low-temperature solid oxide fuel cells (LT-SOFCs) have recently gained enormous attention worldwide with a new research trend focusing on single layer fuel cells (SLFC), which have better cell performance than traditional SOFCs at low operating temperatures. In this study, a triple (e(-)/O2-/H+) conducting perovskite BaCo0.4Fe0.4Zr0.1Y0.1O3-delta (BCFZY) is used as the intermediate layer material for SLFC. A high current density of 994 mA/cm(2) at 0.6 V and a peak power density of 610 mW/cm(2) with an OCV of 1.01 V has been achieved with a cell operating temperature of 550 degrees C, confirming the application feasibility of BCFZY in SLFCs. Furthermore, a typical proton conductor BaZr0.8Y0.2O3-delta (BZY) is introduced into BCFZY to enhance the cell performance. By adjusting the mass ratio of the BCFZY-BZY layer, an optimal power density is obtained, achieving 703 mW/cm(2) with an OCV of 1.03 V at 550 degrees C with an 8BCFZY:2BZY (wt%) ratio. These findings prove that the proposed BCFZY-BZY holds great promise for developing SLFCs to realize low-temperature operation. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.