Riegraf Matthias, Amaya-Dueñas Diana M, Sata Noriko, Friedrich K Andreas, Costa Rémi
Institute of Engineering Thermodynamics German Aerospace Center (DLR), Pfaffenwaldring 38-40, 70569, Stuttgart, Germany.
Institute for Building Energetics, Thermotechnology and Energy Storage, University of Stuttgart, Pfaffenwaldring 31, 70569, Stuttgart, Germany.
ChemSusChem. 2021 Jun 8;14(11):2401-2413. doi: 10.1002/cssc.202100330. Epub 2021 May 7.
Ni-doped chromite anodes were integrated into electrolyte-supported cells (ESC) with 5×5 cm size and investigated in fuel cell mode with H /H O fuel gas. Both a stoichiometric and a nominally A-site deficient chromite anode material showed promising performance at 860 °C approaching the ones of state-of-the-art Ni/Gd-doped ceria (CGO) anodes. While the difference in polarization resistance was small, an increased ohmic resistance of the perovskite anodes was observed, which is related to their limited electronic conductivity. Increasing the chromite electrode thickness was shown to enhance performance and stability considerably. Degradation increased with current density, suggesting its dependency on the electrode potential, and could be reversed by redox cycling. Sulfur poisoning with 20 ppm hydrogen sulfide led to rapid voltage drops for the chromite anodes. It is discussed that Ni nanoparticle exsolution facilitates hydrogen dissociation to the extent that it is not rate-limiting at the investigated temperature unless an insufficiently thick electrode thickness is employed or sulfur impurities are present in the feed gas.
将镍掺杂的亚铬酸阳极集成到尺寸为5×5 cm的电解质支撑型电池（ESC）中，并在以H₂/H₂O为燃料气体的燃料电池模式下进行研究。化学计量比的和名义上A位缺陷的亚铬酸阳极材料在860 °C时均表现出良好的性能，接近最先进的镍/钆掺杂二氧化铈（CGO）阳极的性能。虽然极化电阻差异很小，但观察到钙钛矿阳极的欧姆电阻增加，这与其有限的电子电导率有关。结果表明，增加亚铬酸电极厚度可显著提高性能和稳定性。降解随电流密度增加，表明其对电极电位的依赖性，并且可以通过氧化还原循环逆转。20 ppm硫化氢导致的硫中毒会使亚铬酸阳极的电压迅速下降。讨论了镍纳米颗粒的析出促进了氢的解离，以至于在所研究的温度下它不是速率限制因素，除非采用的电极厚度不足或原料气中存在硫杂质。
