Proton conducting Zn-doped BaZr0.1Ce0.7Y0.1Zn0.1O3−δ electrolyte with enhanced ionic conductivity for durable CH4 fueled solid oxide fuel cells

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2025-04-03 DOI:10.1016/j.ijhydene.2025.03.365

Jialu Wei, Fanghui Mi, Wei Zhang, Chunwen Sun

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Abstract

BaCeO₃-based proton conductors exhibit high ionic conductivity but suffer from poor chemical stability and high sintering temperatures, limiting their application in protonic ceramic fuel cells (PCFCs). This study demonstrates that Zn doping in BaZr_0.1Ce_0.7Y_0.2O_3−δ (BZCY) enhances both chemical stability and ionic conductivity. BaZr_0.1Ce_0.7Y_0.1Zn_0.1O_3−δ (BZCYZn) achieves higher proton conductivities of 0.022 S cm⁻¹ in humid H₂ and 0.019 S cm⁻¹ in CH₄ at 750 °C, surpassing those of BZCY. Zn doping improves conductivity in both the bulk and grain boundaries. An anode-supported single cell using BZCYZn as the electrolyte delivers peak power densities of 1324.63 mW cm⁻² in H₂ and 647.49 mW cm⁻² in CH₄, significantly outperforming BZCY. The electrochemical performance and mass transport properties of BZCYZn are further analyzed using distribution of relaxation times (DRT) analysis.

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.