1. Scope

Keywords

Rationale

Fuel cell vehicles require to control the trace impurity content s in hydrogen that affects the performance and life of the battery. The halides in hydrogen have an irreversible effect on the performance of hydrogen fuel cells. The halides are adsorbed on the catalyst layer, reducing the catalytic surface area and batter y performance. Chlorides, for example, promote the dissolution of platinum by forming soluble chloride complexes and subsequently depositing them in fuel cell membranes. Potential sources include refrigerants and process cleaners used in chlormembranes. Potential sources include refrigerants and process cleaners used in chlor--alkali alkali produproduction. Carbon monoxide intermediate may be produced during formic acid adsorption, and ction. Carbon monoxide intermediate may be produced during formic acid adsorption, and will affect the activity of the catalystwill affect the activity of the catalyst. Analysis to part-per-billion (ppb) concentration of individual anion contaminants such as hydrogen chloride, chlorine, hydrogenhydrogen chloride, chlorine, hydrogen bromide and formic acidbromide and formic acid in hydrogen and related fuel cell supply gases is necessary for assuring a feed gas of sufficient purity to satisfy fuel cell system needs. Although not intended for application to gases other than hydrogen and related fuel cell supply gases, techniques within this test method can be applied to other gaseous samples requiring anion analysis.