Effects of interface roughness on a liquid-Sb-anode solid oxide fuel cell
Effects of interface roughness on a liquid-Sb-anode solid oxide fuel cell
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DOI：
10.1016/j.ijhydene.2013.09.134
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发表时间：
2013-11
影响因子：
7.2
通讯作者：
Hongjian Wang;Yixiang Shi;N. Cai
中科院分区：
文献类型：
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作者：
Hongjian Wang;Yixiang Shi;N. Cai
固体氧化物燃料电池中的液态Sb阳极在1073K下进行了检测，电池采用单晶氧化钇稳定的氧化锆(YSZ)电解液。两种具有不同阳极-电解液界面形态的电池在“电池”模式下工作，在阳极室内有干Ar流动，以表征界面粗糙度对金属与氧离子的电化学氧化的影响。当采用极光滑的阳极-电解液界面(Ra=0.69 nm)来减小电解液表面形貌的影响时，通过对Tafel方程的拟合，得到本征交换电流密度为1.5 mA/cm−2。当表面粗糙度增加到Ra=1540 nm时，液态Sb阳极的有效接触面积比光滑电池增加了33%。产物Sb_2O_3作为氧离子导体，可以提高有效反应边界。然而，Sb_2O_3在界面上的积累削弱了表面形貌的影响。
Liquid Sb anodes are examined at 1073 K in solid-oxide fuel cells with single-crystal yttria-stabilized zirconia (YSZ) electrolytes. Two types of cells with different anode–electrolyte interface morphologies are operated in “battery” mode, with dry Ar flow in the anode chamber, to characterize the effects of the interface roughness on the electrochemical oxidation of the metals with oxygen ions. When the effects of the electrolyte surface morphology are minimized by using an extremely smooth (Ra = 0.69 nm) anode–electrolyte interface, the intrinsic exchange current density is found to be 1.5 mA cm−2by fitting the Tafel equation. When the surface roughness is increased to Ra = 540 nm, the effective contact area of the liquid Sb anode increases by 33% compared to the smooth cell. The product Sb2O3can increase the effective reaction boundary by acting as an oxygen ion conductor. However, the accumulation of Sb2O3at the interface weakens the effect of the surface morphology.