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Insight into the Electrospinning Process for SOFC Cathode Nanofibers
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2021-03-26 , DOI: 10.1021/acs.jpcc.1c00317 Junyi Gong 1 , Peichen Wu 1 , Zhichuan Bai 1 , Jianjun Ma 1 , Tao Li 2 , Yali Yao 3 , Cairong Jiang 1
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2021-03-26 , DOI: 10.1021/acs.jpcc.1c00317 Junyi Gong 1 , Peichen Wu 1 , Zhichuan Bai 1 , Jianjun Ma 1 , Tao Li 2 , Yali Yao 3 , Cairong Jiang 1
Affiliation
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La1–xSrxCo1–yFeyO3-δ (LSCF) and La1–xSrxMnO3-δ (LSM) are typical cathode materials for solid oxide fuel cells (SOFC). The nanofibers of these materials prepared by electrospinning technology show excellent electrochemical performance. In this work, the electrospinning process for these two materials was investigated in detail. The viscosity and the conductivity of the electrospinning solution were tested. The focus was on evaluating the effect of nitrate concentration on the minimum voltage for a nondripping drop (Vmin). A model of the electrospinning process was proposed to understand the electrospinning process intuitively. The results show that adding LSCF and LSM nitrate to the electrospinning solution affects the solution viscosity by increasing it 3-fold compared to the nitrate-free solution, followed by increases in conductivity and Vmin. This results in a difference in the size and morphology of the nanofibers, probably depending on the types of element, the valence state, and the content of metal ions per unit volume. It is found that 470.6–2267 mP·s and 7.69–17.07 mS/cm are the appropriate values for the viscosity and conductivity, respectively, to obtain relative uniform nanofibers by applying a Vmin in the range of 17–26 kV. The results in this work are expected to serve as a reference for the industrialization of LSM/LSCF nanofiber electrodes and the preparation of other SOFC nanofiber cathodes by electrospinning.
中文翻译：
深入了解SOFC阴极纳米纤维的静电纺丝工艺
La 1– x Sr x Co 1– y Fe y O3 -δ（LSCF）和La 1– x Sr x MnO3 -δ（LSM）是固体氧化物燃料电池（SOFC）的典型阴极材料。通过静电纺丝技术制备的这些材料的纳米纤维表现出优异的电化学性能。在这项工作中，对这两种材料的静电纺丝工艺进行了详细研究。测试了电纺丝溶液的粘度和电导率。重点是评估硝酸盐浓度对无滴降（V min）的最小电压的影响）。提出了静电纺丝过程的模型以直观地了解静电纺丝过程。结果表明，将LSCF和LSM硝酸盐添加到电纺丝溶液中会比无硝酸盐溶液增加3倍，进而增加电导率和V min，从而影响溶液粘度。这导致纳米纤维的尺寸和形态上的差异，这可能取决于元素的类型，化合价态和每单位体积中金属离子的含量。发现470.6–2267 mP·s和7.69–17.07 mS / cm分别是粘度和电导率的适当值，以通过施加V min获得相对均匀的纳米纤维。范围为17–26 kV。这项工作的结果有望为LSM / LSCF纳米纤维电极的工业化以及通过静电纺丝制备其他SOFC纳米纤维阴极提供参考。
更新日期：2021-04-08
中文翻译：
深入了解SOFC阴极纳米纤维的静电纺丝工艺
La 1– x Sr x Co 1– y Fe y O3 -δ（LSCF）和La 1– x Sr x MnO3 -δ（LSM）是固体氧化物燃料电池（SOFC）的典型阴极材料。通过静电纺丝技术制备的这些材料的纳米纤维表现出优异的电化学性能。在这项工作中，对这两种材料的静电纺丝工艺进行了详细研究。测试了电纺丝溶液的粘度和电导率。重点是评估硝酸盐浓度对无滴降（V min）的最小电压的影响）。提出了静电纺丝过程的模型以直观地了解静电纺丝过程。结果表明，将LSCF和LSM硝酸盐添加到电纺丝溶液中会比无硝酸盐溶液增加3倍，进而增加电导率和V min，从而影响溶液粘度。这导致纳米纤维的尺寸和形态上的差异，这可能取决于元素的类型，化合价态和每单位体积中金属离子的含量。发现470.6–2267 mP·s和7.69–17.07 mS / cm分别是粘度和电导率的适当值，以通过施加V min获得相对均匀的纳米纤维。范围为17–26 kV。这项工作的结果有望为LSM / LSCF纳米纤维电极的工业化以及通过静电纺丝制备其他SOFC纳米纤维阴极提供参考。
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