固体氧化物燃料电池的热力学及电化学应用基础

固体氧化物燃料电池是一种典型的电化学装置,可以把燃料气和空气（或氧气）的化学能直接转化为电能。电池的整个反应过程可以根据还原剂和氧化剂反应自由焓来进行热力学计算。对于最简单的氢气和氧气的反应来说,可以根据可逆反应平衡方程式计算电池的可逆功,而且SOFC系统和外部环境的热交换也是可逆的。SOFC作为一种伴生热能的发电装置,对热力学的理解必不可少。所以本文将首先介绍一下SOFC的热力学基础,而作为一种电化学发电装置,需要系统了解SOFC的电化学基础,其中重点介绍SOFC的电化学分析曲线——i-V曲线。

Thermodynamic and Electrochemistry Foundation of Solid Oxide Fuel Cell

Solid oxide fuel cell(SOFC) is a typical electrochemical device,which can directly and efficiently convert chemical energy in fuel and air(or oxygen) to electricity.The overall reaction process of SOFC can be explained by thermodynamic calculation based on the reaction free enthalpy of reductor and oxidant.For the simplest reaction of hydrogen and oxygen,the reversible work of cell can be calculated based on the reversible reaction balance equation,and heat exchange between SOFC system and external environment is also reversible.It is necessary to understand the thermodynamic of SOFC as an electricity device with thermal generation.Thermodynamic foundation of SOFC was presented firstly,and electrochemistry foundation and analysis curve—i-V curve were systematically introduced.