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首页> 外文期刊>International Journal of Electrochemical Science >Catalytic Activity of Ni-YSZ composite as Anode for Methane Oxidation in Solid Oxide Fuel Cells
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Catalytic Activity of Ni-YSZ composite as Anode for Methane Oxidation in Solid Oxide Fuel Cells

机译：Ni-YSZ复合阳极作为固体氧化物燃料电池中甲烷氧化的催化活性

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摘要

Natural gas has been exploited as an available energy source for solid oxide fuel cells in recent years.However, the problem of carbon deposition that forms on nickel-based anodes by using direct methaneresults in performance failure of cells. It is well known that the catalytic partial oxidation of methane isa good solution to suppress carbon formation. Herein, we present an investigation of the catalytic activityof Ni/YSZ cermet anodes as a function of the CH4/O2 flow rate ratio (1 ≤ Rin ≤ 5). The behavior ofmethane catalytic activity was characterized using mass spectrometry (MS) and temperatureprogrammed oxidation (TPO). The catalytic activity of methane oxidation at 700 °C showed that Nioxidation occurred at Rin ≤ 1.67. A basic equilibrium to prevent carbon deposition and Ni oxidationoccurred at Rin = 2.5, which exhibited the best activity among the Ni/YSZ electrodes. Through theelectrochemical measurements and impedance spectroscopy analysis of the cell, it was proved that thecell possessed the lowest ohmic resistance and optimized output performance at Rin = 2.5. In addition, astable cell operation at 0.9 V was guaranteed without serious degradation.
机译：近年来，天然气已被用作固体氧化物燃料电池的可利用能源。然而，通过使用直接甲烷在镍基阳极上形成碳沉积的问题导致了电池性能下降。众所周知，甲烷的催化部分氧化是抑制碳形成的良好解决方案。本文中，我们对Ni / YSZ金属陶瓷阳极的催化活性进行了研究，该催化活性是CH4 / O2流量比（1≤Rin≤5）的函数。使用质谱（MS）和程序升温氧化（TPO）对甲烷催化活性的行为进行了表征。甲烷在700°C氧化的催化活性表明Ni氧化发生在Rin≤1.67处。 Rin = 2.5时发生了防止碳沉积和Ni氧化的基本平衡，在Ni / YSZ电极中表现出最好的活性。通过对该电池的电化学测量和阻抗谱分析，证明该电池在Rin = 2.5时具有最低的欧姆电阻和优化的输出性能。另外，保证了0.9 V的稳定电池工作而没有严重的劣化。

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