In-SituRaman光谱研究MCFC中NiO阴极溶解破坏机理

Investigations on Dissolution Mechanism of the NiO Cathode Materialsin MCFC by In-situ Raman Spectroscopy

采用一种新的原位Ｒａｍａｎ光谱技术对ＣＯ２在熔融碳酸盐燃料电池中的ＮｉＯ阴极的溶解过程中的微观作用进行初步研究．结果表明,ＣＯ２气体极易吸附于ＮｉＯ阴极的表面,在含氧气氛及熔融碳酸盐的条件下,吸附的ＣＯ２与活化态Ｏ２相互作用形成碳酸根,并进入熔盐电解质．ＮｉＯ表面的脱附态ＣＯ２也可与ＮｉＯ中的晶格氧作用,导致ＮｉＯ的溶解破坏．

The investigation of dissolution and degradation mechanism of NiO cathode in Molten CarbonateFuel Cell (MCFC) has recently attracted considerable attention. In this work a novel in-situ Raman spec-troscopic technique were developed to study the CO2 microscopic action in the dissolution of NiO. The re-sults indicate that CO2 tend to adsorb on the surface of NiO, and the adsorbing CO2 is prone to being des-orbed in molten carbonate under O2 contained atmosphere, due to the strong reaction between the adsordedCO2 and active O2 on the NiO surface.