What is the energy density of fuel cell?

In electrical terms, the energy density of hydrogen is equal to 33.6 kWh of usable energy per kg, versus diesel which only holds about 12–14 kWh per kg. What this really means is that 1 kg of hydrogen, used in a fuel cell to power an electric motor, contains approximately the same energy as a gallon of diesel.

What material has the highest energy density?

Liquid hydrocarbons (fuels such as gasoline, diesel and kerosene) are today the most dense way known to economically store and transport chemical energy at a large scale (1 kg of diesel fuel burns with the oxygen contained in ≈15 kg of air).

How do we get energy from fuel cells?

A fuel cell is a device that generates electricity through an electrochemical reaction, not combustion. In a fuel cell, hydrogen and oxygen are combined to generate electricity, heat, and water.

Which battery has highest energy density?

Li-ion batteries
What are some advantages of Li-ion batteries? Compared to the other high-quality rechargeable battery technologies (nickel-cadmium or nickel-metal-hydride), Li-ion batteries have a number of advantages. They have one of the highest energy densities of any battery technology today (100-265 Wh/kg or 250-670 Wh/L).

Is High energy density good?

High energy density means that there are a lot of calories in a little food. Low energy density means there are few calories in a lot of food. That is, you want to eat a greater volume of food that’s lower in calories. This helps you feel fuller on fewer calories.

What is the symbol of energy density?

symbol u
or energy density (energy per volume) symbol u or η (eta) or ε (epsilon).

How long do fuel cells last?

The fuel cell stacks are designed to last the lifetime of the vehicle, about 150,000–200,000 miles. At the end of its lifespan, the fuel cell will be disassembled and the materials recycled, similar to what happens with vehicle components today.

What are the disadvantages of fuel cells?

Disadvantages of using fuel cells in cars These include: hydrogen is in the gas state at room temperature and pressure, so it is difficult to store in the car. fuel cells and electric motors are less durable than petrol engines and diesel engines, so they are not so long-lasting. fuel cells are very expensive.

What is the most powerful battery in the world?

The Saft Ni-Cd battery comprises 4 strings of 3,440 high- rate cells, each rated at 920Ah. Operating up to 5,230V on high-rate charge, not only is this the world’s most powerful battery, it is also by far the world’s highest voltage battery.

How much energy does a fuel cell provide?

Compressed hydrogen and fuel cells can provide electricity to a vehicle traction motor with weights that are between eight to 14 times less than current. 2 . The compressed hydrogen tanks and fuel cell data are based on the following parameters: fuel cell power of 60 kW, FC specific power of 0.94 kW/kg, FC power density of 1.6 kW/liter, 50% FC

How are fuel cells more efficient than combustion engines?

Fuel cells can operate at higher efficiencies than combustion engines, and can convert the chemical energy in the fuel to electrical energy with efficiencies of up to 60%.

What kind of materials are used in fuel cells?

Scientists are currently exploring corrosion-resistant materials for components as well as fuel cell designs that double cell life from the current 40,000 hours (~5 years) without decreasing performance. Solid oxide fuel cells (SOFCs) use a hard, non-porous ceramic compound as the electrolyte.

Are there any fuels with lower energy densities than gasoline?

Beyond gasoline and diesel, other fuels like compressed propane, ethanol, and methanol offer energy densities per unit volume that are less than gasoline and diesel, and energy densities per unit weight that are less than or equal to that of gasoline.