Lo que es
PEM handles variable renewable power well, which is exactly what a hydrogen project needs. The catch is iridium: world production is a few tonnes a year and PEM needs it on every anode.
La lista de materiales
Escálelo →Las cantidades son per MW of capacityrango indicativo
| Material | Bajo | Alto | Unidad | Base |
|---|---|---|---|---|
| Copper crítico | 500.0 | 1,500 | kg | Very high-current power delivery |
| Titanium crítico | 200.0 | 600.0 | kg | Bipolar plates and porous transport layers |
| Iridium crítico Loadings are falling but remain the binding constraint. | 0.3 | 0.7 | kg | Anode catalyst loading |
| Platinum crítico | 0.1 | 0.3 | kg | Cathode catalyst |
Indicative range compiled from published technology studies and chemistry; verify against a manufacturer specification before use. Las filas marcadas como «traza» contienen el material en cantidades demasiado pequeñas para expresarse de forma útil como masa; la restricción allí es la pureza o el número de proveedores, no el tonelaje.
Las alternativas
La sustitución es la fuerza más subestimada en materiales. Cuando un metal se encarece o resulta políticamente problemático, los ingenieros diseñan soluciones alternativas — y la demanda de una mina entera puede desvanecerse.
Alkaline Electrolyser
The century-old design: steel, nickel and potassium hydroxide, with no precious metals at all.
HVDC Transmission Cable
High-voltage direct-current cable, the technology used to move power hundreds of kilometres with low loss.
Pressurised Water Reactor
The most common reactor design: enriched uranium fuel in zirconium tubes, water as both coolant and moderator.
Three-Way Catalytic Converter
The ceramic honeycomb in an exhaust that converts three pollutants at once, coated in platinum-group metals.