An Up-scalable, Infiltration-Based Approach for Improving the Durability of Ni/YSZ Electrodes for Solid Oxide Cells

Xiaofeng Tong, Peter Vang Hendriksen, Anne Hauch, Xiufu Sun, Ming Chen*

*Corresponding author for this work

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In solid oxide electrolysis cells (SOECs), considerable degradation of the Ni/YSZ electrode during long-term electrolysis operation at high current densities (-1 A cm(-2) or above) has been an ongoing challenge. In this work we report on a method alleviating the problem based on infiltrating nano-sized electrocatalysts into the Ni/YSZ electrode of a full cell after it has been reduced in a "one-atmosphere-reduction" process. The performance and durability of infiltrated and non-infiltrated cells are evaluated at full test-cell size of 4 x 4 cm(2) level. The infiltrated cell exhibits significantly enhanced durability when operated for steam electrolysis at 750 degrees C under high current densities, with cell voltage degradation rates of 0.028 V kh(-1) (2.0% kh(-1)) for 800 h at -1.25 A cm(-2) and 0.010 V kh(-1) (0.8% kh(-1)) for 300 h at -1.00 A cm(-2). These degradation rates are similar to 14 times and similar to 25 times smaller than those of the non-infiltrated cell, respectively. The infiltrated cell also shows superior durability to the non-infiltrated cell during reversible operation. These results demonstrate the great potential of boosting the durability of state-of-the-art Ni/YSZ fuel electrodes for electrolysis operation via this infiltration-based approach. (c) 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.
Original languageEnglish
Article number024519
JournalJournal of the Electrochemical Society
Issue number2
Number of pages10
Publication statusPublished - 2020

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