Theoretical and Experimental Investigations on K-doped SrCo0.9Nb0.1O3-δ as a Promising Cathode for Proton-Conducting Solid Oxide Fuel Cells,ChemSusChem

当前位置： X-MOL 学术 › ChemSusChem › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Theoretical and Experimental Investigations on K-doped SrCo0.9Nb0.1O3-δ as a Promising Cathode for Proton-Conducting Solid Oxide Fuel Cells
ChemSusChem ( IF 7.5 ) Pub Date : 2021-07-15 , DOI: 10.1002/cssc.202101100
Kang Zhu ₁ , Yi Yang ₁ , Daoming Huan ₁ , Xueyu Hu ₁ , Nai Shi ₁ , Yun Xie ₁ , Xinyu Li ₁ , Changrong Xia ₁ , Ranran Peng _{1,

2,

3} , Yalin Lu _{1,

2,

3,

4}

Affiliation

Improving proton conduction in cathodes is regarded as one of the most effective methods to accelerate the sluggish proton-involved oxygen reduction reaction (P-ORR) for proton-conducting solid oxide fuel cells (P-SOFCs). In this work, K⁺ dopant was used to improve the proton uptake and migration ability of SrCo_0.9Nb_0.1O_3-δ (SCN). K⁺-doped SCN (KSCN) demonstrated great potential to be a promising cathode for P-SOFCs. Density functional theory calculations suggested that doping with K⁺ led to more oxygen vacancies and more negative values of hydration enthalpy, which was helpful for the improvement of proton concentration. Importantly, the proton migration barriers could be depressed, benefiting proton conduction. Electrochemical investigations signified that the cell using KSCN cathode had a peak power density of 967 mW cm⁻² at 700 °C, about 54.1 % higher than that using a SCN cathode. This research highlights the K⁺-doping strategy to improve electrochemical performance of cathodes for P-SOFCs.

中文翻译：

K 掺杂的 SrCo0.9Nb0.1O3-δ 作为质子传导固体氧化物燃料电池的有前途的阴极的理论和实验研究

改善阴极中的质子传导被认为是加速质子传导固体氧化物燃料电池 (P-SOFC) 缓慢的质子参与氧还原反应 (P-ORR) 的最有效方法之一。在这项工作中，K ⁺掺杂剂用于提高 SrCo _0.9 Nb _0.1 O _{3- δ} (SCN)的质子吸收和迁移能力。K ⁺掺杂的 SCN（KSCN）显示出作为 P-SOFC 的有前途的阴极的巨大潜力。密度泛函理论计算表明，掺杂 K ⁺导致更多的氧空位和更多的水合焓负值，这有助于提高质子浓度。重要的是，质子迁移障碍可能会被抑制，有利于质子传导。电化学研究表明，使用 KSCN 阴极的电池在 700°C 下具有 967 mW cm ^-2的峰值功率密度，比使用 SCN 阴极的电池高约 54.1%。这项研究突出了 K ⁺掺杂策略，以提高 P-SOFC 阴极的电化学性能。

更新日期：2021-09-20

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11