<br>用于低温陶瓷燃料电池的复合异质结构电解质的开发：CaSnO3-ZnO 半导体设计与优化,ACS Applied Energy Materials

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用于低温陶瓷燃料电池的复合异质结构电解质的开发：CaSnO3-ZnO 半导体设计与优化
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2023-11-25 , DOI: 10.1021/acsaem.3c01512
Yiwang Dong ₁ , M.A.K. Yousaf Shah _{2,

3} , Muhammad Yousaf ₂ , Naveed Mushtaq ₄ , Yuzheng Lu ₅ , Changhong Deng ₁

Affiliation

近年来，人们对开发用于低温固体氧化物燃料电池（LT-SOFC）的半导体电解质产生了浓厚的兴趣，并且半导体异质结构由于其快速和高离子传导特性而受到越来越多的关注。为此，本研究研究了由钙钛矿 CaSnO ₃ 和 ZnO 组成的半导体异质结构作为 LT-SOFC 电解质的潜力。电化学分析表明，合成的CaSnO ₃ -ZnO异质结构复合材料是一种混合离子电子导体，在550 °C时表现出0.16 S cm ^–1 的高离子电导率。此外，与该电解质集成的CaSnO ₃ –ZnO燃料电池显示出1.06 V的高开路电压，并在550°时实现了850 mW cm ^–2 可接受的峰值功率输出C。我们提出了界面处的 p-n 体异质结效应来解释 CaSnO ₃ -ZnO 在使用燃料电池膜时增强离子传导并阻止电流的工作原理。此外，CaSnO ₃ 和 ZnO 界面处的能带排列可以产生内建电场，这进一步有助于促进离子传导。我们的研究结果证明了为 LT-SOFC 设计高功能复合电解质的潜力。

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Development of a Composite Heterostructure Electrolyte for Low-Temperature Ceramic Fuel Cells: CaSnO3–ZnO Semiconductor Design and Optimization

In recent years, notable interest in developing semiconductor electrolytes for low-temperature solid oxide fuel cells (LT-SOFCs) has been made, and semiconductor heterostructure has shown growing interest due to its fast and high ion-conducting properties. To this end, this study investigates the potential of a semiconductor heterostructure composed of perovskite CaSnO₃ and ZnO as an electrolyte for LT-SOFCs. Electrochemical analysis revealed that the synthesized CaSnO₃–ZnO heterostructure composite is a mixed ion-electron conductor, exhibiting a high ionic conductivity of 0.16 S cm^–1 at 550 °C. Furthermore, a CaSnO₃–ZnO fuel cell integrated with this electrolyte displayed a high open-circuit voltage of 1.06 V and achieved an acceptable peak power output of 850 mW cm^–2 at 550 °C. We propose a p–n bulk-heterojunction effect at the interface to explain the working principle of the CaSnO₃–ZnO for boosting the ionic conduction and blocking the electrical current when using the membrane of a fuel cell. Moreover, the energy band alignment at the interface of CaSnO₃ and ZnO could produce the built-in electric field, which further helps promote ionic conduction. Our findings demonstrate the potential of designing highly functional composite electrolytes for LT-SOFCs.

更新日期：2023-11-25

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