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High Temperature Fuel Cell System (R&D in Progress)

Hyosung’s High Temperature Fuel Cell Systems, currently in development, feature a high generation efficiency and wider usage range for heat generated than the low temperature PEMFC .

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Description

The general power generation principle of Hyosung’s High Temperature Proton Exchange Membrane Fuel Cell (HT-PEMFC), currently in development, is the same with that of the Low Temperature Proton Exchange Membrane Fuel Cell (LT-PEMFC), however it also features greater power efficiency and a wider range of thermal energy usage.The HT-PEMFC is operated between 100 to 200℃ while the LT-PEMFC is operated between 60 to 80℃

Comparison of HT-PEMFC to LT-PEMFC

Specification

Core Technology		Technology Development Indicator	Development Goal by Steps
Core Technology		Technology Development Indicator	Step 1	Step 2
5kWe HT- PEMFC System (Targeting Spec.)	Maximum electricity/power efficiency	30%LHV	28%	31%
	Maximum total power efficiency	80%LHV	75%	80%
	Operation time	Within 40min.	Within 1hour	Within 40min.
	Performance reduction ratio	0.7%/1000 h	1%/1,000h (operation for 2,000 hours)	0.7%/1,000h (operation for 3,000 hours)

Features

The LT-PEMFC requires expensive and complicated configuration and components due to its complex water management and low durability against CO (less than 10ppm in the fuel). On the other hand, the HT-PEMFC has advantages which include a simpler design and lower cost owing to the reduced number of components as well as the generation of less condensed water and high durability against CO (0.5% or more in the fuel).
With the high temperature feature, the thermal energy usage rate is increased, thereby allowing both cooling/heating services to be provided at the same time as the heat generation.

Features	LT-PEMFC	HT-PEMFC	Merits of HT-PEMFC
Operation Temperature (℃)	70~80	120~170	Enhanced thermal quality
Durability against CO (ppm)	10	3000~5000	Removes the PrOx reactor
Membrane durability (time)	40,000	20,000	(being developing the MEA technique)
Humidification environment	RH 50~100 %	No humidifier	No other humidifier is required
Cross leak (water management)	Ⅹ	○	Enhanced durability
Cold start	Ⅹ (Steam reforming)	○ (Auto thermal reforming)	Simplified system and short start
Poisoning of electrode catalyst	Ⅹ	○	Enhanced tolerance against CO and H₂S
Deterioration by moisture	Ⅹ	○	Enhanced durability
Simplification of system configuration	Ⅹ	○	Low cost and high reliability