关键词: 燃料电池, 电子材料, 电化学, 制氢

Abstract:

Reversible solid oxide fuel cell (RSOC) is all-solid-state electrochemical energy conversion device integrating functions of solid oxide fuel cell (SOFC) and solid oxide electrolysis cell (SOEC), in which chemical energy stored in fuel gases and electric energy can be efficiently reverted reversibly into each other. Based on the operating processes and electrocatalytic mechanism appeared in RSOC, various critical issues (e.g., delamination between oxygen electrode and electrolyte) are outlined and discussed for oxygen electrode materials. In terms of simple perovskites (Mn-based, Co-based and Fe-based), double perovskites and non-perovskites respectively, research status on preparation methods are highlighted and evaluated for these materials, as well as the effects on the electrochemical performance and charge-discharge characteristics of the unit cell employing different materials for the electrolytes and fuel electrodes. Onto avoid the delamination issues appeared between the oxygen electrode and electrolyte layers, some suggestions are proposed, e.g., preparing the intermediate transition layers, developing new types of the oxygen electrode materials with the super oxygen stoichiometry, high oxygen ion conductivity and diffusion coefficient, as well as integrated structures for RSOC functional layers. It is also suggested that the double perovskites materials can be used as one of the promising candidates for the RSOC oxygen electrodes. This work will serve as an important foundation for designing, preparing and optimizing RSOC oxygen electrodes.

Key words: fuel cells, electronic materials, electrochemistry, hydrogen production