Jin Xiaoqian, Gao Cui, Liu Zhi, Dong Wenjing, Xia Chen, Wang Baoyuan, Wang Hao, Wang Xunying
School of Microelectronics, Hubei University Wuhan 430062 China
Hubei Yangtze Memory Laboratories Wuhan 430205 China.
RSC Adv. 2022 Oct 26;12(47):30557-30563. doi: 10.1039/d2ra05665h. eCollection 2022 Oct 24.
The LaSrCoFeO (LSCF)-WO semiconductor composite was applied as an electrolyte for low-temperature solid oxide fuel cells (LTSOFCs). The study results revealed that the fuel cell could output a maximum power density ( ) of 812 mW cm when the weight ratio of LSCF to WO was 8 : 2 (8LSCF-2WO), and its open-circuit voltage (OCV) was higher than 1.0 V. This indicated that there was no short circuit problem in this fuel cell device and 80 wt% LSCF existed in the electrolyte layer. This was mainly due to the suppressed electronic conductivity and increased ionic conductivity of the composite as compared with LSCF due to the introduction of the WO wide band semiconductor. The oxygen ionic conductivity of the 8LSCF-2WO electrolyte was 0.337 S cm, which is much higher than that of the pure LSCF material. According to the XPS analysis results, a higher oxygen vacancy content at the heterointerface between LSCF and WO contributed to the increased ionic conductivity.
LaSrCoFeO（LSCF）-WO半导体复合材料被用作低温固体氧化物燃料电池（LTSOFCs）的电解质。研究结果表明，当LSCF与WO的重量比为8∶2（8LSCF-2WO）时，该燃料电池可输出最大功率密度（ ）812 mW cm ，其开路电压（OCV）高于1.0 V。这表明该燃料电池装置不存在短路问题，且电解质层中存在80 wt%的LSCF。这主要是由于引入WO宽带半导体后，复合材料的电子传导性受到抑制，离子传导性相较于LSCF有所增加。8LSCF-2WO电解质的氧离子传导率为0.337 S cm ，远高于纯LSCF材料。根据XPS分析结果，LSCF与WO之间异质界面处较高的氧空位含量有助于提高离子传导率。
