Most research on ceramic-based cells (SOCs or PCCs) is deeply oriented to reduce energetic cost, while keeping reasonable electrical performance and mechanical strength of the system under dynamic operation. It is usually well admitted in the community that decreasing the operating temperature below 600°C and/or incorporating ultrathin electrolytes of ceramic-based cells benefits by a strict reduction of manufacturing cost and stressing environment. Until now, most of the common SOCs based on anionic conducting materials such as yttrium-stabilized zirconia (YSZ), samaria-doped ceria (SDC), and La1-xSrxGa1-yMgyO3-0.5(x+y) (LSGM) require to operate at temperatures higher than 600°C, challenging the risk of using expensive and more complex engineering materials and processes. In this context, the last decades revealed a renewed interest in the study of protonic ceramic conductors in the domain. The main reason comes from the specific properties of a PCC (operation ability below 600°C, proton kinetics transport, etc.) and the significant improvements obtained both in terms of performances and the fundamental understanding of proton transport through such material (see Chapter 1). As developed in Chapters 2 and 3, many studies are made to lower electrical resistance and cost of PCCs by different strategies of innovation and architecture: ∑ Improving the intrinsic proton transport and physicochemical properties of common ionic-conducting ceramics ∑ Finding novel electrode materials and reliable interfaces microstructure with high catalytic activity and chemical compatibility ∑ Favoring easy and reproducible scalable processes from cell to stack design Thus, several industrial routes more and more employed are promoting solid-state proton conductors in several domains, especially in (a) sensors, (b) separators, (c) fuel cells, (d) (co-)electrolysis, (e) ammonia synthesis, and (f) heterogeneous catalytic reactors. This chapter relates main progress results of electrochemical performances and reliability and proposes orientations and pros-pects of PCC devices applied in such applications. 4.1 Proton-Conducting Material: An 18.104.22.168 Electrochemical performance As described in Fig. 4.1, a fuel cell is a device that converts the chemical energy from a hydrogen source as the fuel into electricity through a electrochemical reaction with oxygen or another oxidizing agent. In this sense, fuel cell devices differ from batteries since they can produce electricity continually as long as inlet gases are supplied. In such an operation, a protonic ceramic cell (PCC) device proposes several intrinsic advantages, in particular the nondilution of the fuel at the hydrogen electrode side since water is produced at the air side (in contrast with what is observed in common solid oxide cell [SOC] device).
All Science Journal Classification (ASJC) codes
- 化学 (全般)