Description
Springer Polymer Electrolyte Fuel Cell Durability by Buchi Felix N. Et.Al
This Book Covers A Significant Number Of R&D Projects Performed Mostly After 2000 Devoted To The Understanding And Prevention Of Performance Degradation Processes In Polymer Electrolyte Fuel Cells (Pefcs). The Extent And Severity Of Performance Degradation Processes In Pefcs Were Recognized Rather Gradually. Indeed The Recognition Overlapped With A Significant Number Of Industrial Dem- Strations Of Fuel Cell Powered Vehicles Which Would Suggest A Degree Of Technology Maturity Beyond The Resaolution Of Fundamental Failure Mechanisms. An Intriguing Question Therefore Is Why Has There Been This Apparent Delay In Addressing Fun- Mental Performance Stability Requirements. The Apparent Answer Is That Testing Of The Power System Under Fully Realistic Operation Conditions Was One Prerequisite For Revealing The Nature And Extent Of Some Key Modes Of Pefc Stack Failure. Such Modes Of Failure Were Not Exposed To A Similar Degree Or Not At All In Earlier Tests Of Pefc Stacks Which Were Not Performed Under Fully Relevant Conditions Parti- Larly Such Tests Which Did Not Include Multiple On-Off And/Or High Power-Low Power Cycles Typical For Transportation And Mobile Power Applications Of Pefcs. Long-Term Testing Of Pefcs Reported In The Early 1990S By Both Los Alamos National Laboratory And Ballard Power Was Performed Under Conditions Of C- Stant Cell Voltage Typically Near The Maximum Power Point Of The Pefc.Show More