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Tailoring the Oxygen Vacancy to Achieve Fast Intrinsic Proton Transport in a Perovskite Cathode for Protonic Ceramic Fuel Cells
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-04-22 00:00:00 , DOI: 10.1021/acsaem.0c00486
Rongzheng Ren 1 , Zhenhua Wang 1, 2 , Xingguang Meng 1 , Xinhua Wang 1 , Chunming Xu 1 , Jinshuo Qiao 1 , Wang Sun 1 , Kening Sun 1, 2
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-04-22 00:00:00 , DOI: 10.1021/acsaem.0c00486
Rongzheng Ren 1 , Zhenhua Wang 1, 2 , Xingguang Meng 1 , Xinhua Wang 1 , Chunming Xu 1 , Jinshuo Qiao 1 , Wang Sun 1 , Kening Sun 1, 2
Affiliation
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Protonic ceramic fuel cells (PCFCs) are receiving increasing attention because of their high energy conversion efficiency. However, traditional mixed oxygen-ionic and electronic conductors (MOECs) show sluggish oxygen reduction kinetics when used in PCFCs because of their intrinsic low protonic conductivity. Herein, it is reported that cooperatively regulating the concentration and basicity of oxygen vacancies can result in fast proton transport in MOECs, which is demonstrated in a Zr4+-doped Sr2Fe1.5Mo0.5O6−δ (SFMZ) perovskite. The so-obtained SFMZ perovskite renders plentiful oxygen vacancies and strong hydration ability, which can boost the formation of protonic defects. Furthermore, the chemical diffusion coefficient of protons (DH,chem) is established first to determine the proton mobility of the cathode. The results indicate that SFMZ exhibits improved proton diffusion kinetics with a DH,chem value of 8.71 × 10–7 cm2 s–1 at 700 °C, comparable to the diffusion coefficient of the commonly used protonic electrolyte BaZr0.1Ce0.7Y0.1Yb0.1O3−δ of 1.84 × 10–6 cm2 s–1. A low polarization resistance of 0.169 Ω cm2 and a peak power density as high as 0.79 W cm–2 were achieved at 700 °C with the SFMZ cathode. Such excellent performance suggests that rationally tailoring the oxygen vacancy is a feasible strategy to promote proton diffusion in perovskite-structured electrode materials as efficient PCFC cathodes.
中文翻译：
定制氧空位，以在质子陶瓷燃料电池用钙钛矿阴极中实现快速的本征质子传输。
质子陶瓷燃料电池（PCFC）由于其高能量转换效率而受到越来越多的关注。但是，传统的混合氧离子和电子导体（MOEC）在PCFC中使用时，由于其固有的低质子传导性而显示出缓慢的氧还原动力学。在本文中，据报道，其协作地调节氧空位的浓度和碱度可导致MOECs快速质子运输，这是体现在将Zr 4+掺杂的Sr 2的Fe 1.5沫0.5 ø 6-δ（SFMZ）钙钛矿。如此获得的SFMZ钙钛矿提供了大量的氧空位和强大的水合能力，可促进质子缺陷的形成。此外，首先确定质子的化学扩散系数（D H，chem），以确定阴极的质子迁移率。结果表明，SFMZ表现出改善的质子扩散动力学，其D H在700°C下的化学值为8.71×10 –7 cm 2 s –1，与常用的质子电解质BaZr 0.1 Ce 0.7 Y 0.1的扩散系数相当。Yb 0.1 O 3−δ为1.84×10–6 cm 2 s –1。使用SFMZ阴极在700°C时可实现0.169Ωcm 2的低极化电阻和高达0.79 W cm -2的峰值功率密度。如此优异的性能表明，合理地调整氧空位是促进钙钛矿结构电极材料作为高效PCFC阴极中质子扩散的可行策略。
更新日期：2020-04-22
中文翻译：
定制氧空位，以在质子陶瓷燃料电池用钙钛矿阴极中实现快速的本征质子传输。
质子陶瓷燃料电池（PCFC）由于其高能量转换效率而受到越来越多的关注。但是，传统的混合氧离子和电子导体（MOEC）在PCFC中使用时，由于其固有的低质子传导性而显示出缓慢的氧还原动力学。在本文中，据报道，其协作地调节氧空位的浓度和碱度可导致MOECs快速质子运输，这是体现在将Zr 4+掺杂的Sr 2的Fe 1.5沫0.5 ø 6-δ（SFMZ）钙钛矿。如此获得的SFMZ钙钛矿提供了大量的氧空位和强大的水合能力，可促进质子缺陷的形成。此外，首先确定质子的化学扩散系数（D H，chem），以确定阴极的质子迁移率。结果表明，SFMZ表现出改善的质子扩散动力学，其D H在700°C下的化学值为8.71×10 –7 cm 2 s –1，与常用的质子电解质BaZr 0.1 Ce 0.7 Y 0.1的扩散系数相当。Yb 0.1 O 3−δ为1.84×10–6 cm 2 s –1。使用SFMZ阴极在700°C时可实现0.169Ωcm 2的低极化电阻和高达0.79 W cm -2的峰值功率密度。如此优异的性能表明，合理地调整氧空位是促进钙钛矿结构电极材料作为高效PCFC阴极中质子扩散的可行策略。
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