质子传导型固体氧化物燃料电池BaZr0.1Ce0.7Y0.1Yb0.1O3电解质的氟化研究

doi:10.15541/jim20240535

摘要/Abstract

摘要： 质子传导型固体氧化物燃料电池(H⁺-SOFC)因温度依赖性弱和能量转换效率高而备受关注。本工作通过氟化诱导提高了电解质BaZr_0.1Ce_0.7Y_0.1Yb_0.1O₃(BZCYYb)的质子传导性。在450~800 ℃温区,氟化后的BaZr_0.1Ce_0.7Y_0.1Yb_0.1O_2.9F_0.1 (BZCYYbF)钙钛矿在干氢气中的电导率(σ)为4.59×10^-3~2.14×10^-2S/cm,高于未氟化BZCYYb电解质的电导率(σ=3.99×10^-3~1.86×10^-2 S/cm)。电解质氟化可以明显降低阳极对氢氧化反应的极化阻抗,700 ^oC条件下从氟化前的2.50 Ω·cm²降低到1.94 Ω·cm²,并700 ℃条件下300 μm厚电解质支撑单电池(BSCN|电解质|LSFMN)的总阻抗从氟化前的1.54 Ω·cm²降低到氟化后的1.45 Ω·cm²)。因此,电解质氟化的单电池输出功率要明显高于电解质未氟化的全电池。700 ℃时,氟化电解质支撑单电池的最大输出功率密度P_max=172 mW·cm^-2,明显高于未氟化电解质支撑全电池(P_max=144 mW·cm^-2)。追本溯源,这是由于电解质氟化不但提高了电解质质子传导能力,而且强化了阳极侧三相界面对氢燃料的吸附/解离和扩散速率。综上,氟化能明显改善BZCYYb电解质的质子传导能力,有助于提升H⁺-SOFC的电化学性能。

关键词: 质子传导型固体氧化物燃料电池(H⁺-SOFC), 质子导电电解质, 氟化, 导电性, 电化学性能

Abstract: Proton-conducting solid oxide fuel cells (H⁺-SOFC) have gained great attention due to weak temperature dependence and high energy conversion efficiency. In this work, a fluorination strategy based on the BaZr_0.1Ce_0.7Y_0.1Yb_0.1O₃(BZCYYb) electrolyte was proposed to improve the proton conductivity. It was found that the conductivity (σ) of the fluorinated BZCYYbF, BaZr_0.1Ce_0.7Y_0.1Yb_0.1O_2.9F_0.1 (BZCYYbF), is 4.59×10^-3-2.14×10^-2 S/cm at 450~800 ℃ in dry H₂, higher than that of primitive BZCYYb electrolyte (σ=3.99×10^-3-1.86×10^-2 S/cm). It is found that the electrolyte fluorination significantly reduces the anode polarization resistance (R_p) for hydrogen oxidation reaction from 2.5 Ω·cm² to 1.94 Ω·cm², and the total resistance (R_tot) of the single cell with 300-μm-thick electrolyte supporting from 1.54 Ω·cm² to 1.45 Ω·cm², respectively. Therefore, the BZCYYbF single cell shows much higher maximum power density (172 mW·cm^-2) than the BZCYYb single cell (144 mW·cm^-2) at 700 ℃. This result is attributed to the fact that the electrolyte fluorination not only improves the proton conduction capacity but also enhances the rates of H₂ diffusion and adsorption/dissociation on the anode sides. In conclusion, the fluorination of BZCYYb electrolyte can significantly improve its proton conductivity and thereby contributes to superior electrochemical performance of H⁺-SOFC.

Key words: proton conducting solid oxide fuel cell (H⁺-SOFC), proton conducting electrolyte, fluorination, conductivity, electrochemical performance

中图分类号:

TQ15

姜玥宏, 宋云峰, 张磊磊, 马季, 宋昭远, 龙文. 质子传导型固体氧化物燃料电池BaZr_0.1Ce_0.7Y_0.1Yb_0.1O₃电解质的氟化研究[J]. 无机材料学报, DOI: 10.15541/jim20240535.

JIANG Yuehong, SONG Yunfeng, ZHANG Leilei, MA Ji, SONG Zhaoyuan, LONG Wen. Fluorination of BaZr0.1Ce0.7Y0.1Yb0.1O3 as Electrolyte Material for Proton Conducting Solid Oxide Fuel Cell[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20240535.

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质子传导型固体氧化物燃料电池BaZr_0.1Ce_0.7Y_0.1Yb_0.1O₃电解质的氟化研究

Fluorination of BaZr0.1Ce0.7Y0.1Yb0.1O3 as Electrolyte Material for Proton Conducting Solid Oxide Fuel Cell

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