An Efficient Construction of Nano-interfaces Enables the Excellent Coking Tolerance of Cermet Anodes

Kang Xu, Hua Zhang, Yangsen Xu, Feng Zhu, Fan He, Ying Liu, Sasaki Kotaro, YongMan Choi*, Yu Chen*

*此作品的通信作者

研究成果: Article同行評審

摘要

Solid oxide fuel cells (SOFCs) are promising energy conversion devices for the effective and convenient utilization of hydrocarbons (for example, methane) to electricity. However, the development of direct methane SOFCs is primarily hindered by the poor coking tolerance of the state-of-the-art Ni-based cermet anodes. Herein, we efficiently construct nano-interfaces in the anode by infiltrating a Ni0.6Y0.064Zr0.336O2-δ (NYZ) catalyst onto the traditional Ni-based cermet anode to effectively enhance the coking tolerance. After being reduced in H2, Ni and Y0.16Zr0.84O2-δ (YSZ) nanoparticles (NPs) are in situ formed on the surface of the Ni-YSZ substrate. The roughened anode demonstrates significantly improved fuel oxidation activity and coking tolerance, due likely to the formation of nano-interfaces. Specifically, when applied in the Ni-YSZ-based anode-supported SOFCs, a high peak power density of 1.785 W cm−2 and a stable operation of ∼ 240 h with no observable degradation is achieved at 750 °C in nearly dry methane (3 % H2O). A density functional theory study suggests that the excellent coking tolerance is attributed to the formation of OH species on Ni/YSZ nano-interfaces, which would further interact with intermediate carbon species to generate COH intermediates.
原文American English
期刊Materials Today
DOIs
出版狀態E-pub ahead of print - 3 8月 2024

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