Desing and Fabrication of multi-cell Solid Polymer Electrolyte（SPE-Type）Hydrogen Generator and It’s Performance Analysis
Date Issued
2006
Date
2006
Author(s)
Tsai, Ming-Chang
DOI
zh-TW
Abstract
This study is focused on developing a multi-cell, solid-polymer-electrolyte type hydrogen generator. The characteristics of the SEP hydrogen generator are: (1) non- corrosive electrolyte is used, (2) higher purity of hydrogen gas was obtained without extra purification, (3) higher energy conversion efficiency was achieved at high current densities, (4) stack is fabricated by bipolar plate to improve the hydrogen generation rate. The MEA was fabricated by coating the catalyst on the surface of membrane directly, which allowing the uniform coating of catalyst, and consequently the surface of membrane could be kept smooth. The optimum flow field geometry was selected in accordance with the simulation result of CFD. The effect of temperature and volumetric rate of water, gaseous pressure in stack, distance between two electrodes, and catalyst loading on performance of SEP hydrogen generator, was investigated experimentally.
Experimental results of single-cell electrolyzer and five-cell electrolyzer show that the energy conversion efficiency could be significantly improved by increasing the water temperature to 70℃. Hydrogen content of producer gas can be achieved up to 99.7% if the cathode and anode was both equipped with an O-ring, respectively.
The optimum performance of the SPE electrolyzer made in this study is:
(1) single cell: 2.47V@200mA/cm2，H2 generation rate 70ml/min，energy conversion efficiency 55.66%，Faraday efficiency 92%。
(2) stack:12.94V@200mA/cm2，H2 generation rate 355ml/min，energy conversion efficiency 52.85%，Faraday efficiency 94.1%。
Subjects
質子交換膜
多電極組
雙極板
Nafion 117
stack
bipolar plate
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-95-R93522317-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):36bd55af72e017eefd7ef3a472c73caa