Carbon deposition behaviour in metal-infiltrated gadolinia doped ceria electrodes for simulated biogas upgrading in solid oxide electrolysis cells
Carbon deposition behaviour in metal-infiltrated gadolinia doped ceria electrodes for simulated biogas upgrading in solid oxide electrolysis cells
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DOI：
10.1016/j.jpowsour.2015.06.003
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发表时间：
2015-10
影响因子：
9.2
通讯作者：
V. Duboviks;M. Lomberg;R. Maher;L. Cohen;N. Brandon;G. Offer
中科院分区：
文献类型：
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作者：
V. Duboviks;M. Lomberg;R. Maher;L. Cohen;N. Brandon;G. Offer
可逆固体氧化物电池（SOC）的一个引人注目的应用是通过高温电解将CO2转化为CO，这对于沼气提质特别重要。为了提高沼气的利用率，可以通过电解将CO2成分转化为燃料。SOC在沼气上运行的一个重要问题是碳诱导的催化剂失活。由于成本和性能的原因，镍被广泛用于SOC电极中，但其对碳沉积的耐受性低。本工作基于原位拉曼测量提出了镍基电极上碳形成的两种不同模式，这与以前的研究一致。虽然已知铜对碳形成具有抗性，但是两个显著的问题阻碍了其在SOC电极中的应用，即其相对低的熔化温度，抑制高温烧结，以及对氢氧化的低催化活性。在这项研究中，通过低温金属渗透技术制备的电极。由于金属渗透技术避免了高烧结温度，因此制造并测试了Cu-Ce 0. 9 Gd 0. 1 O2 −δ（Cu-CGO）电极作为Ni-CGO电极的替代品。我们证明了Cu-CGO电极的性能与Ni-CGO电极相当，而在沼气混合物上操作时，碳的形成被完全抑制。
One of the attractive applications for reversible Solid Oxide Cells (SOCs) is to convert CO2into CO via high temperature electrolysis, which is particularly important for biogas upgrading. To improve biogas utility, the CO2component can be converted into fuel via electrolysis. A significant issue for SOC operation on biogas is carbon-induced catalyst deactivation. Nickel is widely used in SOC electrodes for reasons of cost and performance, but it has a low tolerance to carbon deposition. Two different modes of carbon formation on Ni-based electrodes are proposed in the present work based onex-situRaman measurements which are in agreement with previous studies. While copper is known to be resistant towards carbon formation, two significant issues have prevented its application in SOC electrodes – namely its relatively low melting temperature, inhibiting high temperature sintering, and low catalytic activity for hydrogen oxidation. In this study, the electrodes were prepared through a low temperature metal infiltration technique. Since the metal infiltration technique avoids high sintering temperatures, Cu–Ce0.9Gd0.1O2−δ(Cu-CGO) electrodes were fabricated and tested as an alternative to Ni-CGO electrodes. We demonstrate that the performance of Cu-CGO electrodes is equivalent to Ni-CGO electrodes, whilst carbon formation is fully suppressed when operated on biogas mixture.