Thermodynamic and electrochemical analyses of a solid oxide electrolyzer for hydrogen production


ALZAHRANI A. A. , Dincer I.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, cilt.42, ss.21404-21413, 2017 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 42 Konu: 33
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1016/j.ijhydene.2017.03.186
  • Dergi Adı: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
  • Sayfa Sayıları: ss.21404-21413

Özet

In this paper, a modeling of the Solid Oxide Electrolysis Cell (SOEC), through energetic, exergetic and electrochemical modeling approaches, is conducted, and its performance, particularly through exergy efficiency, is analyzed under various operating conditions and state properties for optimum hydrogen production. In a comprehensively performed parametric study, at a single electrolysis cell scale, the effects of varying some operating conditions, such as temperature, pressure, steam molar fraction and the current density on the cell potential and hence the performance are investigated. In addition, at the electrolyzer system scale, the overall electrolyzer performance is investigated through energy and exergy efficiencies, in addition to the system's power density consumption, hydrogen production rate, heat exchange rates and exergy destruction parameters. The present results show that the overall solid oxide electrolyzer energy efficiency is 53%, while the exergy efficiency is 60%. The exergy destruction at a reduced operating temperature increases significantly. This may be overcome by the integration of this system with a source of steam production. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.