(यह छवि केवल उदाहरण के लिए बनाई गई है)
एक प्रोटॉन-विनिमय झिल्ली ईंधन सेल (PEMFC) uses a solid polymer membrane, such as Nafion, as its electrolyte. This membrane selectively conducts protons ([latex]H^+[/latex]) from the anode to the cathode. PEMFCs operate at low temperatures (typically 50-100°C), enabling rapid start-up and a compact design. They require high-purity hydrogen as fuel to avoid poisoning the platinum-based उत्प्रेरक.
The heart of the PEMFC is the membrane electrode assembly (MEA), which consists of the proton-exchange membrane sandwiched between two catalyst-coated electrodes. At the anode, hydrogen gas is split into protons and electrons: [latex]H_2 \rightarrow 2H^+ + 2e^-[/latex]. The solid polymer membrane, which is an electrical insulator, allows only the protons to pass through to the cathode. The electrons are forced to travel through an external circuit, generating the electrical current. At the cathode, oxygen from the air, the protons from the membrane, and the electrons from the external circuit combine to form water: [latex]O_2 + 4H^+ + 4e^- \rightarrow 2H_2O[/latex].
A critical aspect of PEMFC operation is water management. The membrane must remain hydrated to maintain its proton conductivity, but excess water at the cathode (product water) can block the flow of oxygen to the उत्प्रेरक sites, a phenomenon known as ‘flooding’. The low operating temperature makes PEMFCs susceptible to catalyst poisoning, particularly from carbon monoxide (CO) present in reformed hydrogen, which binds strongly to the platinum catalyst sites. This necessitates the use of very pure हाइड्रोजन ईंधनजिससे परिचालन लागत में वृद्धि होती है।
प्रोटॉन-एक्सचेंज मेम्ब्रेन फ्यूल सेल (PEMFC)
(यदि तिथि अज्ञात है या प्रासंगिक नहीं है, उदाहरण के लिए "द्रव यांत्रिकी", तो इसके उल्लेखनीय उद्भव का एक अनुमानित आंकड़ा प्रदान किया गया है)
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