High performance air electrode for solid oxide regenerative fuel cells fabricated by infiltration of nano-catalysts
High performance air electrode for solid oxide regenerative fuel cells fabricated by infiltration of nano-catalysts
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DOI：
10.1016/j.jpowsour.2013.10.123
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发表时间：
2014-03
影响因子：
9.2
通讯作者：
S. Lee;Jeonghee Kim;Ji-won Son;Jong-Ho Lee;Byung‐Kook Kim;Hae-June Je;H. Lee;Huesup Song;K. Yoon
中科院分区：
文献类型：
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作者：
S. Lee;Jeonghee Kim;Ji-won Son;Jong-Ho Lee;Byung‐Kook Kim;Hae-June Je;H. Lee;Huesup Song;K. Yoon
研究了高温固体氧化物再生燃料电池(SORCs)用高活性纳米催化剂浸渍多孔支架制备的高性能空气电极。将Sm0.5Sr0.5CoO3(SSC)催化剂的硝酸盐前驱体溶液浸渍到多孔La0.6Sr0.4Co0.2Fe0.803(LSCF)-GdO_2掺杂CeO_2(GDC)复合骨架中，通过尿素分解诱导的均匀成核，在SORFC运行初期通过原位结晶均匀地合成了超细的SSC纳米颗粒。SSC纳米催化剂的尺寸在40-80 nm之间，在750℃下SORFC运行时抗粗化性能稳定。在发电和制氢模式下，SSC纳米催化剂的加入都显著提高了电化学性能。交流阻抗谱的系统分析表明，纳米催化剂对空气电极的表面修饰显著促进了O2还原和O2−氧化的表面化学交换反应，这是制约SORFC性能的主要过程。
A high performance air electrode fabricated by infiltration of highly active nano-catalysts into a porous scaffold is demonstrated for high-temperature solid oxide regenerative fuel cells (SORFCs). The nitrate precursor solution for Sm0.5Sr0.5CoO3(SSC) catalyst is impregnated into a porous La0.6Sr0.4Co0.2Fe0.8O3(LSCF)–gadolinia-doped ceria (GDC) composite backbone, and extremely fine SSC nano-particles are uniformly synthesized byin-situcrystallization at the initial stage of SORFC operation via homogeneous nucleation induced by urea decomposition. The SSC nano-catalysts are in the size range of 40–80 nm and stable against coarsening upon the SORFC operation at 750 °C. The electrochemical performance is significantly improved by incorporation of SSC nano-catalysts in both power generation and hydrogen production modes. Systematic analysis on the impedance spectra reveals that the surface modification of the air electrode with nano-catalysts remarkably accelerates the chemical surface exchange reactions for both O2reduction and O2−oxidation, which are the major limiting processes for SORFC performance.