Enhancing the Mechanical Strength of Electrolyte-Supported Solid Oxide Cells with Thin and Dense Doped-Ceria Interlayers,ACS Applied Materials & Interfaces

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Enhancing the Mechanical Strength of Electrolyte-Supported Solid Oxide Cells with Thin and Dense Doped-Ceria Interlayers
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-10-13 , DOI: 10.1021/acsami.1c13899
Matthias Riegraf ₁ , Ilaria Bombarda ₂ , Ferdinand Dömling ₂ , Tom Liensdorf ₂ , Carolin Sitzmann ₂ , Nico Langhof ₂ , Stefan Schafföner ₂ , Feng Han ₁ , Noriko Sata ₁ , Christian Geipel ₃ , Christian Walter ₃ , Rémi Costa ₁

Affiliation

The penetration of fuel cells and electrolyzers in energy systems calls for their scale-up to the gigawatt (GW) level. High temperature solid oxide cells (SOC) offer unrivaled efficiencies in both electrolysis and fuel cell operation. However, they are made of ceramics and are brittle by nature. Consequently, a high mechanical strength to avoid failure during stacking is essential to achieve a high manufacturing yield. Here, we show that without changing the materials of the state-of-the-art cells, thin and dense ceria interlayers enable comparable power densities and durability in fuel cell operation. The sole tuning of the morphology and processing of the interlayers reduce the residual stress in the cell significantly which increases its mechanical strength by up to 78%. These results promise performance gains of similar magnitude by enabling a substantial decrease of the electrolyte thickness while maintaining robustness. This stress engineering approach presents a way to increase the volumetric power density and material efficiency of SOC systems.

中文翻译：

用薄而密的掺杂二氧化铈中间层提高电解质支撑的固体氧化物电池的机械强度

燃料电池和电解槽在能源系统中的渗透要求将其放大到千兆瓦 (GW) 级别。高温固体氧化物电池 (SOC) 在电解和燃料电池运行方面都具有无与伦比的效率。然而，它们是由陶瓷制成的，本质上很脆。因此，避免堆叠过程中出现故障的高机械强度对于实现高制造产量至关重要。在这里，我们展示了在不改变最先进技术的材料的情况下电池、薄而致密的氧化铈夹层可在燃料电池操作中实现可比的功率密度和耐用性。中间层的形态和加工的唯一调整显着降低了电池中的残余应力，使其机械强度提高了 78%。这些结果通过在保持稳健性的同时显着降低电解质厚度，保证了类似幅度的性能提升。这种应力工程方法提供了一种提高 SOC 系统体积功率密度和材料效率的方法。

更新日期：2021-10-27

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