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Analysis of solid oxide membrane (SOM) electrolyzer with liquid metal anode.

机译：带有液态金属阳极的固体氧化物膜（SOM）电解槽的分析。

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摘要

Concerns about the depletion of fossil fuel reserves and increase in atmospheric carbon dioxide and temperature make hydrogen based energy systems an attractive alternative energy source. However, a cleaner, reliable, and cheaper hydrogen production route, which is independent of fossil fuel, is necessary for hydrogen to be used extensively as a fuel. In this work, the performance of a novel, energy-efficient, solid oxide membrane (SOM) electrolyzer for production of high purity hydrogen from steam and various reductants including hydrocarbon waste is analyzed and modeled to assist in scaling up of this technology.;The SOM electrolyzer consists of an oxygen-ion-conducting yttria-stabilized zirconia (YSZ) electrolyte with a dip coated Ni-YSZ cermet cathode on one side and liquid metal anode on the other side. The SOM electrolyzer is operated at 800-1100°C by feeding a steam-rich gas to the Ni-YSZ cermet cathode and a reductt (coal, natural gas, hydrocarbon waste) into the liquid metal anode. Along with electrolytic production of hydrogen, AC impedance spectroscopy and potentiodynamic scans are performed to characterize the various polarization losses (ohmic and non-ohmic) in the electrolyzer and understand the fundamental nature of the electrode reactions. The long term performance of the SOM electrolyzer is evaluated using chronoamperometric measurements. Further, the durability of the liquid metal anode and Ni-YSZ cathode are evaluated employing symmetrical half cells.;Based on the results obtained from the experimental study and theoretical modeling, the design of a cathode-supported commercial SOM electrolyzer producing 25 kg/day of hydrogen is proposed. Energy analysis of the proposed electrolyzer shows that hydrogen can be generated at an efficiency of nearly 75% employing carbon as reductant. Finally, future research is proposed for successful implementation of the SOM electrolyzer technology utilizing different types of wastes.
机译：对化石燃料储量的枯竭以及大气中二氧化碳和温度升高的担忧使基于氢的能源系统成为有吸引力的替代能源。但是，要使氢气广泛用作燃料，就必须有一种更清洁，可靠和便宜的氢气生产路线，该路线与化石燃料无关。在这项工作中，分析和建模了一种新型的高效节能的固体氧化物膜（SOM）电解槽的性能，该电解槽可从蒸汽和各种还原剂（包括碳氢化合物废物）生产高纯度氢气，以帮助扩大该技术的规模。 SOM电解槽的组成是：传导氧离子的氧化钇稳定的氧化锆（YSZ）电解质，一侧为浸涂Ni-YSZ金属陶瓷阴极，另一侧为液态金属阳极。通过将富蒸汽的气体供入Ni-YSZ金属陶瓷阴极并将还原剂（煤，天然气，碳氢化合物废物）供入液态金属阳极，SOM电解器可在800-1100°C的温度下运行。随着氢气的电解生产，还进行了交流阻抗谱和电位动力学扫描，以表征电解槽中的各种极化损耗（欧姆和非欧姆），并了解电极反应的基本性质。使用计时安培测量法评估SOM电解槽的长期性能。此外，采用对称的半电池评估了液态金属阳极和Ni-YSZ阴极的耐久性。基于实验研究和理论建模获得的结果，设计了日产量为25 kg的阴极支撑型SOM电解槽的设计。提出了氢气。所提议的电解器的能量分析表明，使用碳作为还原剂，可以近75％的效率产生氢气。最后，为成功实施利用不同类型废物的SOM电解技术提出了未来的研究。

著录项

  • 作者

    Pati, Soobhankar.;

  • 作者单位

    Boston University.;

  • 授予单位 Boston University.;
  • 学科 Engineering Chemical.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 154 p.
  • 总页数 154
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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