Electrochemical Properties of a Dual-Ion Semiconductor-Ionic Co0.2Zn0.8O-Sm0.20Ce0.80O2−δ Composite for a High-Performance Low-Temperature Solid Oxide Fuel Cell,ACS Applied Energy Materials

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Electrochemical Properties of a Dual-Ion Semiconductor-Ionic Co0.2Zn0.8O-Sm0.20Ce0.80O2−δ Composite for a High-Performance Low-Temperature Solid Oxide Fuel Cell
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-01-11 , DOI: 10.1021/acsaem.0c02095
Sajid Rauf ₁ , M. A. K. Yousaf Shah ₂ , Bin Zhu ₃ , Zuhra Tayyab ₁ , Nasir Ali ₄ , Sanam Attique ₅ , Chen Xia ₁ , Rabia Khatoon ₆ , Changping Yang ₁ , Muhammad Imran Asghar _{1,

7} , Peter D. Lund ₇

Affiliation

Semiconductor heterostructures offer a high ionic conduction path enhanced by built-in electric field at the interface, which helps to avoid electronic conduction in low-temperature solid oxide fuel cells (LT-SOFCs). In this study, we synthesized a semiconductor heterostructure based on Co-doped ZnO and Sm_0.2Ce_0.8O_2–δ (SDC) for LT-SOFC application. First, we optimized the composition of the Co-doped ZnO by varying the doping concentration. The cell with Co_0.2Zn_0.8O composition (σ_i = 0.158 S cm^–1) yielded the best performance of 664 mW cm^–2 at 550 °C. This optimized composition of Co-doped ZnO was mixed with a well-known ionic conductor Sm_0.2Ce_0.8O_2−δ (SDC) to further improve the ionic conductivity and performance of the cell. The heterostructure formed between these two semiconductor materials improved the ionic conductivity of this composite material to 0.24 S cm^–1 at 550 °C, which is 2 orders higher in magnitude than that of bulk SDC. The fuel cells fabricated with this promising semiconductor-ionic heterostructure material produced an outstanding power density of 928 mW cm^–2 at 550 °C. Our further investigation shows protonic conduction (H⁺) in the Co_0.2Zn_0.8O-SDC composite, which exhibited protonic conduction 0.088 S cm^–1 with a power density of 388 mW cm^–2 at 550 °C. A detailed characterization of the material and the fuel cells is performed with the help of different electrochemical (electrochemical impedance spectroscopy (EIS)), spectroscopic (X-ray diffraction (XRD), UV–vis spectroscopy, X-ray photoelectron spectroscopy (XPS)), and microscopic techniques (scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), energy-dispersive X-ray spectrometry (EDX)). The stability of the cell was tested for 35 h to ensure stable operation of these devices. This semiconductor-ionic heterostructure composite provides insight into the development of electrolyte membranes for advanced SOFCs.

中文翻译：

高性能低温固体氧化物燃料电池双离子半导体-离子Co _0.2 Zn _0.8 O-Sm _0.20 Ce _0.80 O2 _-δ复合材料的电化学性能

半导体异质结构通过界面处的内置电场增强了高离子传导路径，这有助于避免低温固体氧化物燃料电池（LT-SOFC）中的电子传导。在这项研究中，我们合成了一种基于Co掺杂的ZnO和Sm _0.2 Ce _0.8 O _2–δ（SDC）的半导体异质结构，用于LT-SOFC应用。首先，我们通过改变掺杂浓度来优化Co掺杂ZnO的成分。用Co小区_0.2的Zn _0.8 O的合成物（σ_我= 0.158小号厘米^-1）得到的664的最佳性能毫瓦厘米^-2在550°C下。将这种优化的Co掺杂ZnO成分与众所周知的离子导体Sm _0.2 Ce _0.8 O2 _-δ（SDC）混合，以进一步改善电池的离子电导率和性能。这两种半导体材料之间形成的异质结构在550°C的温度下将这种复合材料的离子电导率提高到0.24 S cm ^–1，其大小比本体SDC高2个数量级。用这种有前途的半导体离子异质结构材料制造的燃料电池在550°C时产生了928 mW cm ^–2的出色功率密度。我们的进一步研究表明Co _0.2 Zn _0.8中的质子传导（H ⁺）O-SDC复合材料在550°C时表现出质子传导0.088 S cm ^–1，功率密度为388 mW cm ^–2。借助不同的电化学（电化学阻抗谱（EIS）），光谱（X射线衍射（XRD），UV可见光谱，X射线光电子能谱（XPS））对材料和燃料电池进行详细的表征）和显微镜技术（扫描电子显微镜（SEM），高分辨率透射电子显微镜（HR-TEM），能量色散X射线光谱仪（EDX））。测试电池的稳定性35小时，以确保这些设备的稳定运行。这种半导体-离子异质结构复合材料为开发高级SOFC的电解质膜提供了见识。

更新日期：2021-01-25

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