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Proton Shuttles in CeO2/CeO2−δ Core–Shell Structure

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journal contribution
posted on 10.10.2019 by Yueming Xing, Yan Wu, Lingyao Li, Quan Shi, Jing Shi, Sining Yun, Muhammad Akbar, Baoyuan Wang, Jung-Sik Kim, Bin Zhu

A core-shell structure with a CeO2 core and a non-stoichiometry CeO2-d surface layer built up proton shuttles, leading to a super proton conductivity of 0.15 S cm-1 and advanced fuel cell performance, 661 mW cm-2 at 520 ºC. The surface induced conduction process was investigated through a heat-treatment procedure for CeO2 pellets at different temperatures. The surface layer was observed to experience ordering and disappearing after high temperature treatments. Proton conduction was verified via electrochemical impedance spectra, proton conducting isotopic effect and fuel cell measurement. The isotopic effect provided a direct evidence on proton conduction and proton conduction mechanism was further investigated based on the semiconductor nature with the intrinsic CeO2 (i-type) core and n-type CeO2-δ shell. The charged layers were formed at the interface of CeO2-δ/CeO2 core-shell heterostructure with a positively charged layer located at CeO2-δ side of the interface and negative charged layer located at the intrinsic CeO2. Due to the electrostatic repulsion between protons and the positively charged layer, protons’ transportation is limited at the surface region of the CeO2-δ shell. Thus, continuous “proton shuttles” are formed, resulting in super conductivity. This work presents a new methodology and scientific understanding for fast proton transport in general oxides and advanced proton ceramic fuel cells (PCFCs).

Funding

National Natural Science Foundation of China (NSFC; Grant Nos. 51772080, 51774259, and 51672208).

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

ACS Energy Letters

Volume

4

Pages

2601 - 2607

Publisher

American Chemical Society (ACS)

Version

AM (Accepted Manuscript)

Rights holder

© American Chemical Society

Publisher statement

This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Energy Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsenergylett.9b01829

Acceptance date

03/10/2019

Publication date

2019-10-03

Copyright date

2019

ISSN

2380-8195

eISSN

2380-8195

Language

en

Depositor

Dr Jung-Sik Kim

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