What type of reaction is responsible for the generation of energy from fuel cells?
When the electrons return from doing work, they react with oxygen in the air and the protons (which have moved through the membrane) at the cathode to form water. This union is an exothermic reaction, generating heat that can be used outside the fuel cell.
How much hydrogen is used in a 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.
How is the reaction between hydrogen and oxygen controlled in a fuel cell?
The oxidation of the fuel (hydrogen) at the anode electrode provides electrons that flow round (via some device e.g. bulb, motor etc.) to the cathode electrode to effect the reduction of the oxygen. So you have simultaneous oxidation and a reduction, therefore overall a redox reaction.
What does a catalyst do in a fuel cell?
In a fuel cell, the catalyst facilitates the reaction of oxygen and hydrogen. It is usually made of platinum powder very thinly coated onto carbon paper or cloth. The catalyst is rough and porous so the maximum surface area of the platinum can be exposed to the hydrogen or oxygen.
What happens in a hydrogen-oxygen fuel cell quizlet?
When hydrogen rich fuels enter a fuel cell, it reacts electrochemically with oxygen to produce water, heat and electric power.
Which type of fuel cell is the most likely to be used to power vehicles?
The most common type of fuel cell for vehicle applications is the polymer electrolyte membrane (PEM) fuel cell. In a PEM fuel cell, an electrolyte membrane is sandwiched between a positive electrode (cathode) and a negative electrode (anode).
What is being reduced at the cathode in the hydrogen fuel cell quizlet?
Explanation: A fuel cell directly converts chemical energy into electrical energy. It has an anode and a cathode reaction like other electrochemical cells. Oxidation occurs at the anode and reduction occurs at the cathode.
What is one of the advantages of a fuel cell quizlet?
More efficient because fuel cells are up to three times more efficient than internal combustion engines.
What is one of the advantages of a fuel cell?
Hydrogen fuel cells do not produce any CO2 emissions during operation, even if their production is not necessarily carbon-free. This gives them an advantage over combustion engine vehicles, which can emit small amounts of poisonous carbon monoxide and require well-ventilated rooms for indoor use.
Which limitation of fuel cells is the most likely reason why people are concerned about using fuel cells in cars?
Which limitation of fuel cells is the most likely reason why people are concerned about using fuel cells in cars? Hydrogen gas is volatile. What is a benefit of fuel cell cars over standard cars?
What is the primary difference between a fuel cell and a battery?
The biggest difference between the two is that a battery stores energy, while a fuel cell generates energy by converting available fuel. A fuel cell can have a battery as a system component to store the electricity it’s generating.
What is the primary difference between a fuel cell and a battery quizlet?
What is the primary difference between a fuel cell and a battery? Fuel cells produce electical energy as long as fuel is supplied; batteries run down and need to be recharged.
Is Fuel Cell A secondary battery?
There are two basic types of batteries: primary and secondary. Examples of secondary batteries include nickel-cadmium (NiCd), lead acid, and lithium ion batteries. Fuel cells are similar to batteries in that they generate an electrical current, but require continuous addition of fuel and oxidizer.
What is the advantage of supercapacitor over battery or fuel cell?
Supercapacitors – pros, cons and typical use It typically stores 10 to 100 times more energy per unit mass or volume than electrolytic capacitors, can accept and deliver charge much faster than batteries, and tolerates many more charge and discharge cycles than rechargeable batteries.
What is difference between primary and secondary battery?
Battery or cells are referred to as the parallel combination of electrochemical cells. The major difference between a primary cell and the secondary cell is that primary cells are the ones that cannot be charged but secondary cells are the ones that are rechargeable.
What is the difference between primary and secondary cell wall?
The primary wall is the cellulose-containing layer laid down by cells that are dividing and growing. To allow for cell wall expansion during growth, primary walls are thinner… Secondary cell walls are responsible for most of the plant’s mechanical support as well as the mechanical properties prized in wood.
What is the law on which secondary cells work?
Answer. Answer: Rechargeable batteries (also known as secondary cells) are batteries that potentially consist of reversible cell reactions that allow them to recharge, or regain their cell potential, through the work done by passing currents of electricity.