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What is an alternative to platinum?
White gold is a popular alternative to platinum because it looks like its pricy cousin but costs about 45 percent less.
Do hydrogen fuel cells need platinum?
The fuel cells typically use a platinum catalyst to speed up the reaction at the oxygen electrode, but platinum is expensive. The start-up and operation of the fuel cell also introduces side reactions that damage the efficacy of the catalyst.
What are the electrodes made of in a hydrogen fuel cell?
The membrane electrode assembly (MEA) is referred to as the heart of the PEMFC and is usually made of a proton-exchange membrane sandwiched between two catalyst-coated carbon papers.
Which electrodes are used in fuel cell?
A fuel cell consists of two electrodes—a negative electrode (or anode) and a positive electrode (or cathode)—sandwiched around an electrolyte. A fuel, such as hydrogen, is fed to the anode, and air is fed to the cathode.
What is the alternative of platinum in fuel cells?
Cobalt may substitute platinum in fuel cells.
Does platinum react with hydrogen?
Hydrogen molecules will adsorb to the platinum surface. The energy of the interaction between the hydrogen atoms and the platinum surface contributes to the breaking of the bond between the hydrogen atoms.
What is the cathode in the hydrogen fuel cell chegg?
Cathode: The cathode is also a platinum catalyst. The hydroxide ions in the electrolyte are produced by the oxygen supplied to the cathode which reacts with water to gain electrons. A reduction reaction takes place at the cathode.
How does hydrogen work as a fuel?
Hydrogen fuel cells produce electricity by combining hydrogen and oxygen atoms. The hydrogen reacts with oxygen across an electrochemical cell similar to that of a battery to produce electricity, water, and small amounts of heat. Many different types of fuel cells are available for a wide range of applications.
What happens in a hydrogen fuel cell?
In a fuel cell, hydrogen and oxygen are combined to generate electricity, heat, and water. The protons pass through the porous electrolyte membrane, while the electrons are forced through a circuit, generating an electric current and excess heat.