Fuel cell (fc) is a device that uses fuel (such as hydrogen or containing fuel) and oxidant (such as pure oxygen or oxygen in the air) to generate electricity directly and continuously. Since it avoids the limitation of Carnot cycle, this kind of power generation device is not only efficient (the conversion efficiency of electrochemical reaction can be as high as 40% or more), but also free of pollutant gas emission, so it is a future efficient and clean power generation mode. Many domestic and foreign companies are committed to developing PEM fuel cells suitable for mobile phones and laptops. Once put into use, its economic benefits are enormous.

　　Sealed Lead–acid battery is a kind of Lead–acid battery.

　　The following new green battery technologies and related industries have developed particularly rapidly.

　　1. Hydrogen storage materials and nickel metal hydride battery Nickel–metal hydride battery

　　2. Lithium ion embedded materials and liquid electrolyte lithium-ion batteries

　　3. Polymer electrolyte lithium battery or lithium-ion battery

　　4. Zinc–air battery and pem fuel cell

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