Proton Shuttles in CeO2/CeO2−δ Core–Shell Structure,ACS Energy Letters

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Proton Shuttles in CeO2/CeO2−δ Core–Shell Structure
ACS Energy Letters ( IF 19.3 ) Pub Date : 2019-10-09 , DOI: 10.1021/acsenergylett.9b01829
Yueming Xing ₁ , Yan Wu ₁ , Lingyao Li ₁ , Quan Shi ₁ , Jing Shi ₂ , Sining Yun ₃ , Muhammad Akbar ₄ , Baoyuan Wang ₄ , Jung-Sik Kim ₅ , Bin Zhu _{1,

5}

Affiliation

We report a confined proton transportation in the CeO₂/CeO_2−δ core–shell structure to build up proton shuttles, leading to a super proton conductivity of 0.16 S cm^–1 for the electrolyte and advanced fuel cell performance, 697 mW cm^–2 at 520 °C. The semiconductor nature of the CeO₂ (i-type) core and the CeO_2−δ (n-type) shell reveals a unique proton transport mechanism based on the charged layers formed at the interface of the CeO_2−δ/CeO₂ heterostructure. Two key factors of this structure confine proton transport to the particle surface. The first is the high concentration of oxygen vacancies in the surface layer, which benefits proton conduction. The second is a depletion region created by the core–shell interface that allows proton migration only on the surface layer rather than into the bulk CeO₂. The constrained surface region of the CeO_2−δ builds up continuous proton shuttles. This work presents a new methodology and understanding for proton transport in general oxides and a new generation proton ceramic fuel cells.

中文翻译：

CeO ₂ / CeO _2−δ核-壳结构中的质子穿梭

我们以CeO报告密闭运输质子₂ /负责人_2-δ核壳结构，建立质子班车，导致0.16小号厘米的超级质子传导^-1的电解质和先进的燃料电池的性能，697毫瓦厘米^{- 2}在520°C下。CeO ₂（i型）核和CeO _2−δ（n型）壳的半导体性质揭示了基于在CeO _2−δ / CeO ₂界面处形成的带电层的独特质子传输机制。异质结构。这种结构的两个关键因素限制了质子向粒子表面的传输。首先是表面层中高浓度的氧空位，这有利于质子传导。第二个是由核-壳界面形成的耗尽区，该质子区仅允许质子迁移到表面层，而不能迁移到块状CeO _2中。CeO _2-δ的受约束表面区域建立了连续的质子穿梭。这项工作为质子在一般氧化物中的传输和新一代质子陶瓷燃料电池提供了一种新的方法和理解。

更新日期：2019-10-10

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