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Boosting performance and durability of Ni/YSZ cathode for hydrogen production at high current densities via decoration with nano-sized electrocatalysts

Abstract

Conventional Ni/yttria stabilized zirconia (YSZ) electrodes in solid oxide cells experience fast degradation when operated for electrolysis of steam at high current densities. This study shows a relatively simple procedure of infiltrating Ce0.8Gd0.2O2-δ (CGO) nanoparticles into the Ni/YSZ electrode to achieve stable cell performance. The long-term durability tests of the cells with a bare Ni/YSZ electrode and with a CGO infiltrated Ni/YSZ electrode were performed at 800 °C and -1.25 A/cm2. The cell stability was followed by measuring cell voltage and recording electro-chemical impedance spectra. The post-mortem analysis of the tested cells was done with scanning and transmission electron microscopy. The CGO nanoparticles infiltration reduced the cell voltage degradation rate from 699 mV/kh for the bare Ni/YSZ electrode to 66 mV/kh for the infiltrated one. The investigation showed that after introducing CGO nanoparticles the steam reduction mechanism was changed and that the electrode degradation itself came from different mechanisms than for the bare Ni/YSZ electrode.

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Publication details

The article was received on 20 Sep 2018, accepted on 09 Feb 2019 and first published on 12 Feb 2019


Article type: Paper
DOI: 10.1039/C8NR07678B
Citation: Nanoscale, 2019, Accepted Manuscript

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    Boosting performance and durability of Ni/YSZ cathode for hydrogen production at high current densities via decoration with nano-sized electrocatalysts

    S. Ovtar, X. Tong, J. R. Bentzen, K. Thyden, S. B. B. Simonsen and M. Chen, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C8NR07678B

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