menu
bartleby
search
close search
Hit Return to see all results

20. What is the purpose of the PEM in a fuel cell?a. to prevent the hydrogen protons from passingthrough to the oxygen and forming waterb. to prevent the oxygen protons from passingthrough to the hydrogen and forming waterc. to prevent the electrons from passing directlyfrom the positive side of the fuel celld. to prevent the electrons from passing directlyto the positive side of the fuel cell

Question
20. What is the purpose of the PEM in a fuel cell?
a. to prevent the hydrogen protons from passing
through to the oxygen and forming water
b. to prevent the oxygen protons from passing
through to the hydrogen and forming water
c. to prevent the electrons from passing directly
from the positive side of the fuel cell
d. to prevent the electrons from passing directly
to the positive side of the fuel cell
help_outline

Image Transcriptionclose

20. What is the purpose of the PEM in a fuel cell? a. to prevent the hydrogen protons from passing through to the oxygen and forming water b. to prevent the oxygen protons from passing through to the hydrogen and forming water c. to prevent the electrons from passing directly from the positive side of the fuel cell d. to prevent the electrons from passing directly to the positive side of the fuel cell

fullscreen
check_circleAnswer
Step 1

All the kinds of fuel cells work in a similar way and basically consists of three segments, that is, anode, electrolyte and the cathode and two chemical reactions occur at the interfaces of these segments. The fuel is used by these chemical reactions to form water, carbon dioxide and the electric current.

Step 2

In case of hydrogen-oxide proton-exchange membrane (PEM) fuel cell, there exists a layer in between the cathode and the anode which consists of an electrolyte solution and allow protons to pass through it. The hydrogen reacts with the catalyst on the anode side to form proton and electron. The protons react with the oxidants to form the proton membranes which allows the protons to pass through it but not the electrons because the membrane is electrically insulating.

Whereas, on the cathode side, the oxygen from the air reacts with the electrons coming from the external circuit and the protons coming from the membranes to result in water.

Electron Flow
Hydrogen
Oxygen
Hydrogen lons
Excess hydrogen Anode Electrolyte Cathode
Water
help_outline

Image Transcriptionclose

Electron Flow Hydrogen Oxygen Hydrogen lons Excess hydrogen Anode Electrolyte Cathode Water

fullscreen
Step 3

The membrane looks like a kitchen wrap and only allows the positively charged ions but not electrons to pass thro...

Electric current
Fuel in
Air in
н*
н"
Unused
air, water
H2O and heat
Excess
fuel out
Anode Electrote Cathode
help_outline

Image Transcriptionclose

Electric current Fuel in Air in н* н" Unused air, water H2O and heat Excess fuel out Anode Electrote Cathode

fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Our solutions are written by experts, many with advanced degrees, and available 24/7

See Solution
Tagged in

Engineering

Electrical Engineering

Related Electrical Engineering Q&A

Find answers to questions asked by student like you

Show more Q&A add
question_answer

Q: Feedback Control of Dynamic Systems (7th edition) - Problem 7.19

A: Click to see the answer

question_answer

Q: When you are converting an instantaneous current to a phasor, how does the phase angle being positiv...

A: The overall solution depends on the phase angle or epoch (initial phase) of the instantaneous form o...

question_answer

Q: 11- Find i (t) in the following circuit. You may employ any method you wish t = 0 22 22 24 V (t)

A: First calculate the current just after the switch is closed.Capacitor behaves as a short circuit jus...

question_answer

Q: The figure attached to this question shows the 1 line diagram of a simple three bus power system wit...

A: Convert the line impedances into admittances, using Y=1/Z 

question_answer

Q: A substation receives 6000 kVA at 6 kV, 0.8 p.f. lagging on low voltage side of a transformer from a...

A: The single line diagram of the system is shown below:

question_answer

Q: Feedback Control of Dynamic Systems (7th edition) - Problem 7.39

A: Hi there!! Since there are four parts in the question, I will be answering only the first two parts....

question_answer

Q: .il Verizon LTE 7:42 PM ร์ 100%- Done 3- In the following circuit find vc(t) andi,(t) given; v,(1)-2...

A: From the given circuit, the switch is connected to v1(t) at t < 0. As the supply v1(t) is connect...

question_answer

Q: Q3. By using the method of images, prove that the capacitance between conductor and earth, taking in...

A: From the diagram shown below, we can say that:

question_answer

Q: Convert the following numbers to scientific notation.Following these Question and answer.29) 5000 KΩ...

A: We need to convert the numbers given below into scientific notations.

Sorry about that. What wasn’t helpful?