用于低温 (450–550 °C) 固体氧化物燃料电池的 A 位缺陷型半导体电解质 Sr1-xCoxFeO3-δ,RSC Advances

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用于低温 (450–550 °C) 固体氧化物燃料电池的 A 位缺陷型半导体电解质 Sr1-xCoxFeO3-δ
RSC Advances ( IF 3.9 ) Pub Date : 2022-08-30 , DOI: 10.1039/d2ra03823d
Yuzheng Lu ₁ , M A K Yousaf Shah ₂ , Naveed Mushtaq ₂ , Muhammad Yousaf ₂ , Peter D Lund ₃ , Bin Zhu ₂ , Muhammad Imran Asghar _{3,

4}

Affiliation

低工作温度下的快速离子传导是固体氧化物燃料电池 (SOFC) 高电化学性能的关键因素。这里提出了一种用于低温固体氧化物燃料电池 (LT-SOFC)的 A 位缺陷型半导体电解质 Sr _{1- x} Co _x FeO _{3- δ 。}Ni/NCAL-Sr _0.7 Co _0.3 FeO _{3− δ} -NCAL/Ni结构的燃料电池在550 ℃下达到了771 mW cm ^{-2的良好性能。}此外，在 A 位适当掺杂钴可增强电荷载流子传输，从而产生 >0.1 S cm ^{-1的离子电导率}在 550 °C。1.05 V 的高 OCV 证实了在准备好的 SOFC 装置的运行过程中没有发生短路和功率损耗。_{Sr 0.5} Co _0.5 FeO _{3- δ}和Sr _0.3 Co _0.7 FeO _{3- δ}的改性组成也分别达到了542和345 mW cm ^-2的良好燃料电池性能。能带隙分析证实，将钴掺杂到所制备的钙钛矿结构的 A 位中可以提高电荷传输效果。此外，XPS 光谱显示了共掺杂到 A 位点如何增强 O 空位，从而改善氧化物离子的传输。目前的工作表明，Sr _0.7 Co_0.3 FeO_{3− δ}是一种有前途的 LT-SOFC 电解质。通过共掺杂来调整能带结构，可以提高其性能。

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A-site deficient semiconductor electrolyte Sr1−xCoxFeO3−δ for low-temperature (450–550 °C) solid oxide fuel cells

Fast ionic conduction at low operating temperatures is a key factor for the high electrochemical performance of solid oxide fuel cells (SOFCs). Here an A-site deficient semiconductor electrolyte Sr_1−xCo_xFeO_3−δ is proposed for low-temperature solid oxide fuel cells (LT-SOFCs). A fuel cell with a structure of Ni/NCAL-Sr_0.7Co_0.3FeO_3−δ–NCAL/Ni reached a promising performance of 771 mW cm⁻² at 550 °C. Moreover, appropriate doping of cobalt at the A-site resulted in enhanced charge carrier transportation yielding an ionic conductivity of >0.1 S cm⁻¹ at 550 °C. A high OCV of 1.05 V confirmed that neither short-circuiting nor power loss occurred during the operation of the prepared SOFC device. A modified composition of Sr_0.5Co_0.5FeO_3−δ and Sr_0.3Co_0.7FeO_3−δ also reached good fuel cell performance of 542 and 345 mW cm⁻², respectively. The energy bandgap analysis confirmed optimal cobalt doping into the A-site of the prepared perovskite structure improved the charge transportation effect. Moreover, XPS spectra showed how the Co-doping into the A-site enhanced O-vacancies, which improve the transport of oxide ions. The present work shows that Sr_0.7Co_0.3FeO_3−δ is a promising electrolyte for LT-SOFCs. Its performance can be boosted with Co-doping to tune the energy band structure.

更新日期：2022-08-30

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