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固体氧化物燃料电池是一种有应用前景的绿色能源转化装置,目前得到了广泛关注,然而传统的Ni基金属陶瓷阳极容易因积碳而失活是固体氧化物燃料电池商业化的一个发展瓶颈.本研究基于低成本的中温固体氧化物燃料电池,发展了一种稳健的具有纳米网状结构的Ni-Ti O2-δ阳极材料,以潮湿的甲烷为燃料展现了良好的电化学性能和长期稳定性.结合X射线衍射、X射线光电子能谱、电子顺谱共振及高分辨透射电镜等测试结果,揭示了Ni Ti O3阳极支撑体原位还原形成了具有纳米网状结构的Ni/Ti O2-δ新型阳极,可以吸附大量的水,从而可以通过水重整过程有效地实现积碳转移.密度泛函理论计算解释了积碳转移过程,在阳极的三相界面处,被Ti O2-δ吸附的水解离的OH与Ni吸附积碳发生电化学反应生成CO和H,进而氧化成CO2和H2O.
Solid oxide fuel cell is an promising green energy conversion device and has drawn much attention at present. However, the traditional Ni-based cermet anode is easily deactivated by carbon deposition, which is a bottleneck for the commercialization of solid oxide fuel cells Based on a low-cost, mid-temperature solid oxide fuel cell, this study developed a robust Ni-Ti O2-δ anode material with a nanostructured network that exhibits good electrochemical performance over long-term Stability.According to the results of X-ray diffraction, X-ray photoelectron spectroscopy, electron resonance spectroscopy and high-resolution transmission electron microscopy, the Ni Ti O3 anode support was reduced in situ to form Ni / Ti O2 -δ novel anode, which can adsorb large amount of water, so that carbon transfer can be effectively achieved through water reforming process. The density functional theory calculations explain the carbon deposition process. At the anode interface, Ti O2-δ Adsorbed water OH and Ni adsorption carbon deposition occurs electrochemical reaction of CO and H, and then oxidized to CO2 and H2O.