The effect of an anode functional layer on the steam electrolysis performances of protonic solid oxide cells
The effect of an anode functional layer on the steam electrolysis performances of protonic solid oxide cells
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DOI：
10.1039/d1ta02848k
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发表时间：
2021-06
影响因子：
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通讯作者：
Chunmei Tang;K. Akimoto;Ning Wang;L. Fadillah;Sho Kitano;H. Habazaki;Y. Aoki
中科院分区：
文献类型：
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作者：
Chunmei Tang;K. Akimoto;Ning Wang;L. Fadillah;Sho Kitano;H. Habazaki;Y. Aoki
基于BaZrxCe0.8−xYb0.1Y0.1O3−δ质子导体的质子固体氧化物蒸汽电解电池（P-SOECs）有望在中温下从可再生能源中生产“绿色”氢气。在此，我们证明了具有高Zr含量电解质BaZr0.6Ce0.2Y0.1Yb0.1O3−δ（BZCYYb 6211）的电池的电解性能可以通过使用La0.5Sr0.5CoO3−δ（LSC）薄膜（约90 nm）作为阳极功能层（AFL）来显著改善。电化学测量表明，LSC-AFL显着降低了在气体-电解质-电极三相边界的电化学质子掺入反应的势垒高度。因此，BZCYYb 6211电池的欧姆电阻和极化电阻分别从0.52和0.98 Ω cm 2降低到0.26和0.57 Ω cm 2，其中LSC-AFL在600 °C下。此外，BZCYYb 6211电池在1.3 V下实现了1.22 A cm−2的高电解电流，法拉第效率约为80%，这相当于使用最先进电解质BaZr0.1Ce0.7Y0.1Yb 0.1O3 −δ（BZCYYb 1711）的电池的法拉第效率（1.13 A cm−2）。BZCYYb 6211与LSC-AFL显示出良好的耐久性在500 °C下，在高蒸汽条件下，施加电流为1 A cm−2，持续100小时。这些结果表明，AFL的引入是获得具有优异性能和耐久性的P-SOEC的有效方法。
Protonic solid oxide steam electrolysis cells (P-SOECs) based on BaZrxCe0.8−xYb0.1Y0.1O3−δ proton conductors are promising to produce “green” hydrogen from renewable energy at intermediate temperatures. Herein, we demonstrate that the electrolysis performances of a cell with a high-Zr-content electrolyte, BaZr0.6Ce0.2Y0.1Yb0.1O3−δ (BZCYYb6211), can be significantly improved by using a La0.5Sr0.5CoO3−δ (LSC) thin film (∼90 nm) as an anode functional layer (AFL). Electrochemical measurements indicated that LSC-AFL significantly reduced the barrier height for the electrochemical proton incorporation reaction at the gas–electrolyte–electrode triple-phase boundary. Hence, both the ohmic and polarization resistances of the BZCYYb6211 cell decreased from 0.52 and 0.98 Ω cm2 to 0.26 and 0.57 Ω cm2, respectively, with the LSC-AFL at 600 °C. In addition, the BZCYYb6211 cell achieved a high electrolysis current of 1.22 A cm−2 at 1.3 V with a Faraday efficiency of approximately 80%, which was equivalent to that (1.13 A cm−2) of the cell with a state-of-the-art electrolyte BaZr0.1Ce0.7Y0.1Yb0.1O3−δ (BZCYYb1711). BZCYYb6211 with LSC-AFL showed good durability at 500 °C under high steam conditions with an applied current of 1 A cm−2 for 100 h. These results revealed that the introduction of an AFL is an effective method to obtain P-SOECs with excellent performances and durability.