Nanocomposite electrodes for high current density over 3 A cm-2 in solid oxide electrolysis cells
Nanocomposite electrodes for high current density over 3 A cm-2 in solid oxide electrolysis cells
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DOI：
10.1038/s41467-019-13426-5
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发表时间：
2019-11-28
影响因子：
16.6
通讯作者：
Fujishiro, Yoshinobu
中科院分区：
文献类型：
--
作者：
Shimada, Hiroyuki;Yamaguchi, Toshiaki;Fujishiro, Yoshinobu
固体氧化物电解电池理论上可以实现较高的能量转换效率，但必须进一步提高电流密度以提高产氢率，这是实现广泛应用的关键。在这里，我们报告了一种固体氧化物电解电池的结构技术，可以实现高于3 a cm（-2）的电流密度，这超过了最先进的电解槽。采用纳米尺度的Sm0.5Sr0.5CoO3-delta和Ce0.8Sm0.2O1.9高度分散，亚微米尺度的粒子形成具有宽孔道的导电网络，开发了双峰结构的纳米复合氧电极。该结构是通过喷雾热解从原料粉状物料阶段制备电极结构实现的。采用纳米复合电极的固体氧化物电解电池在蒸汽电解操作中表现出较高的电流密度（例如，在1.3 V下），在750℃下达到3.13 A cm(-2)，在800℃下达到4.08 A cm(-2)，对应的产氢速率分别为1.31和1.71 L h(-1) cm（-2）。
Solid oxide electrolysis cells can theoretically achieve high energy-conversion efficiency, but current density must be further increased to improve the hydrogen production rate, which is essential to realize widespread application. Here, we report a structure technology for solid oxide electrolysis cells to achieve a current density higher than 3 A cm(-2), which exceeds that of state-of-the-art electrolyzers. Bimodal-structured nanocomposite oxygen electrodes are developed where nanometer-scale Sm0.5Sr0.5CoO3-delta and Ce0.8Sm0.2O1.9 are highly dispersed and where submicrometer-scale particles form conductive networks with broad pore channels. Such structure is realized by fabricating the electrode structure from the raw powder material stage using spray pyrolysis. The solid oxide electrolysis cells with the nanocomposite electrodes exhibit high current density in steam electrolysis operation (e.g., at 1.3 V), reaching 3.13 A cm(-2) at 750 degrees C and 4.08 A cm(-2) at 800 degrees C, corresponding to a hydrogen production rate of 1.31 and 1.71 L h(-1) cm(-2) respectively.