The analysis of energy efficiency in water electrolysis under high temperature and high pressure

2017 International Conference on New Energy and Future Energy System

Hourng, L.W.^1 ; Tsai, T.T.^1 ; Lin, M.Y.^2

Department of Mechanical Engineering, National Central University, Taoyuan, Taiwan^1

Department of Mechanical Engineering, Army Academy, Taoyuan, Taiwan^2

关键词: Activation over potentials;    Activation polarization;    Concentration polarization;    Effects of temperature;    High Pressure and High Temperature conditions;    High temperature and high pressure;    Ohmic polarization;    Reaction mechanism;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/93/1/012035/pdf
DOI  :  10.1088/1755-1315/93/1/012035

来源: IOP

【 摘 要 】

This paper aims to analyze the energy efficiency of water electrolysis under high pressure and high temperature conditions. The effects of temperature and pressure on four different kinds of reaction mechanisms, namely, reversible voltage, activation polarization, ohmic polarization, and concentration polarization, are investigated in details. Results show that the ohmic and concentration over-potentials are increased as temperature is increased, however, the reversible and activation over-potentials are decreased as temperature is increased. Therefore, the net efficiency is enhanced as temperature is increased. The efficiency of water electrolysis at 350°C/100 bars is increased about 17%, compared with that at 80°C/1bar.