Modifying the electrode-electrolyte interface of anode supported solid oxide fuel cells (SOFCs) by laser-machining
Modifying the electrode-electrolyte interface of anode supported solid oxide fuel cells (SOFCs) by laser-machining
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通过激光加工改变阳极支持的固体氧化物燃料电池（SOFC）的电极-电解质界面
DOI：
10.1016/j.enconman.2018.06.044
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发表时间：
2018-09
影响因子：
10.4
通讯作者：
Guo Lucun
中科院分区：
文献类型：
--
作者：
Zhang Yanli;Cai Guifan;Gu Yiheng;Ge Lin;Zheng Yifeng;Chen Han;Guo Lucun
采用激光加工技术在介观尺度上对流延法制备的NiO-Y稳定氧化锆(YSZ)阳极基板进行了电极-电解液界面改性。采用了两种不同的表面处理方法：(I)用连续的轨迹扫描整个表面，以产生更粗糙的表面；(Ii)在基片表面上雕刻斑点，形成“凹坑阵列”。研究了基于这些阳极衬底的电池的微观结构和电性能。共聚焦激光扫描显微镜(CLSM)图像显示，对于扫描的阳极，表面粗糙度随激光强度的增加而增大。单电池的扫描电子显微镜(SEM)图像显示电极-电解液界面接触面积增大。与未改性电池相比，采用“较粗”阳极基板的电池在800 °C时的最大功率密度提高了47%。对于第二种情况，单电池横截面的扫描电子显微镜图像显示电极-电解液界面呈波浪状，导致电化学活性区域增大。研究发现，电池性能的提高程度与凹坑的大小有关，需要合适的凹坑直径和深度。在800 °C时，“坑阵列”电池的最大功率密度提高了55%。在这两种情况下，电化学阻抗谱结果表明，改进后单电池的欧姆电阻和极化电阻都有所降低。
The NiO-yttrium stabilized zirconia (YSZ) anode substrates prepared by tape casting are modified via laser-machining technique in mesoscale for electrode-electrolyte interface modification. Two different surface processing methods are applied: (i) scanning the whole surface with continuous tracks to produce a “coarser” surface; (ii) engraving spots on the substrates surface forming “pits array”. The microstructure and electrical performance of the cells based on these anode substrates are investigated. For the scanned anode, confocal laser scanning microscope (CLSM) images show that the surface roughness increases with the laser intensity. The scanning electron microscopy (SEM) images of single cells show that electrode-electrolyte interface contact area is increased. Compared with the unmodified cell, the maximum power density of the cells fabricated with “coarser” anode substrates is improved by 47% at 800 °C. For the second case, the SEM images of cross-section of single cells show that the electrode-electrolyte interface is wavy, resulting increase in the electrochemically active area. It’s found that the degree of performance enhancement of the cells is related to the pits size, and a suitable diameter and depth of the pits are needed. The highest power density of the cells with “pits array” increases by 55% at 800 °C. In both cases, electrochemistry impedance spectroscopy (EIS) results show that ohmic and polarization resistances of single cells are decreased after modification.
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