Fabrication and analysis of multi-cell Hydrogen Generator System with proton exchange membrane water electrolyzer
Date Issued
2007
Date
2007
Author(s)
Fang, I-Le
DOI
zh-TW
Abstract
In this study, the main point is to develop and improve the efficiency of a SPE-type water electrolyzer. The design process starts with choosing the type of flow field and the material of electrode. First, verify the flow field by CFD software-FLUENT the grid type flow field forms a uniform flow field; Second, according to electrochemistry, a non-corrosive electrode has to be used in the electrolysis process. Titanium is a good electrode material that can stand in acid enviroment and anti-oxidation. So, the titanium plate with grid type flow field has been chosen.
In the single-cell test, this study discuss the performance of the electrolyzer with different thickness of the proton exchange membrane, different nafion loading in the catalyst layer, different locking type of titanium plate and different catalyst loading on anode. The performance will be verified by voltage efficiency, Faraday efficiency and energy conversion efficiency.
The multi-cell electrolyzer is designed on the basis of single-cell electrolyzer. A three-cell electrolyzer is built. Each cell’s performance has been shown by its IV-Curve. The product (hydrogen gas) has the purity 99.84%, which is tested by gas chromatograph(GC) and the Faraday efficiency is up to 98%. From the result of high purity and high Faraday efficiency of product gas, good sealing and unhindered flow field can be confirmed. The optimum performance of the electrolyzer in this study is:
Single cell: 200mA/cm2@2V, voltage efficiency 74%, hydrogen production rate 76ml/min, Faraday efficiency 98.55%, energy conversion efficiency 73.16%
Three-cell stack: 200mA/cm2@6.91V, voltage efficiency 64.25%, hydrogen production rate 228ml/min, Faraday efficiency 98.83%, energy conversion efficiency 63.47%
Subjects
純水電解器
固態電解質
氫氣產生器
water electrolyzer
solid polymer electrolyte
hydrogen generator
SDGs
Type
thesis