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Updated: Jan 13, 2026

High-pressure Sapphire Cell for Phase Equilibria Measurements of CO2/Organic/Water Systems
Published on: January 24, 2014
Understanding the Roles of Double- and Triple-Phase Boundaries in High-Temperature CO2 Electrolysis
Xiwen Tan1, Tongbao Wang1, Quan Chen1
1State Key Laboratory of Bioinspired Interfacial Materials Science, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren'ai Road, Suzhou, Jiangsu 215123, China.
Abstract:
High-temperature solid oxide electrolysis cells are promising for CO2-to-CO conversion with high selectivity and energy efficiency. However, the correlation between the electrolysis performance and electrode interface structure remains poorly understood. Here, in a Ni/ceria system, we demonstrate that the segregation-free Ni-doped ceria forms double-phase boundaries (DPBs) with CO2, offering a CO outlet concentration of 83.0 ± 0.2%. By contrast, carbon deposition was seen in controls with triple-phase boundaries (TPBs) formed by segregated Ni and ceria interfacing with CO2. The electrochemical activity strongly correlates with oxygen vacancy (Ov) concentrations in Ni/ceria. The segregation-free Ni/ceria catalyst achieves 1.4 A cm-2 at 1.65 ± 0.01 V and operates stably at 600 mA cm-2 for 220 h without any decay in activity. The results indicate that enriching Ov at DPBs promotes high-temperature CO2 electrolysis, with a more influential role than TPBs for these ceria-based catalysts.
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