Skip to main content

Questions tagged [electrochemistry]

Electrochemistry is the branch of physical chemistry that studies the relationship between electricity, as a measurable and quantitative phenomenon, and identifiable chemical change, with either electricity considered an outcome of a particular chemical change or vice versa. These reactions involve electric charges moving between electrodes and an electrolyte (or ionic species in a solution).

Filter by
Sorted by
Tagged with
3 votes
3 answers
506 views

Simulation of a battery with lifting up and role of salt bridge

Usually for explanation of the mechanism of a battery, it is modelled by lifting a mass from lower to higher position. The attached figure shows a mass that goes down due to the gravitational ...
H. Khani's user avatar
  • 303
1 vote
1 answer
19 views

When an element near the star surface absorbs the discrete frequency of star's em radiation do this absorbed photons ought to accumulate?

We all know about emittion lines that are empty from a discrete em freqency depending on the element that absorbs that frequency band near the star which we observe when looking at these astrophysical ...
Krešimir Bradvica's user avatar
-1 votes
1 answer
95 views

Are electrons still present in dead batteries?

After the end of chemical reaction in battery which makes voltage and flow of current, do the electrons existing in copper wire remain there or not?
RUCHI Goyal's user avatar
0 votes
1 answer
26 views

Atomic Level Explanation of Active Cathodic Protection

I was trying to understand why active current cathodic protection doesn't work for cars and I realized I don't really understand what's going on with cathodic protection at an atomic level. I ...
Peter Gerdes's user avatar
0 votes
1 answer
54 views

Can a Transformer Last until the Heath Death of the Universe if Made with Inorganic Insulation? [closed]

Transformers have no moving parts in direct contact with other solids, do not rely on non-reversible chemical reactions, and do not rely on nuclear reactions. So, with inert materials, the atomic ...
CoastCity Lapse 00crashtest's user avatar
1 vote
1 answer
51 views

Capacity loss in a battery

It is often said how to the health of a battery gets worse as you charge and discharge it through numerous cycles. So, the maximum available cell capacity a battery can have after recharging reduces ...
risa's user avatar
  • 27
0 votes
1 answer
58 views

Potential difference between electrolyte and electrodes in terms of electrostatics concept

As a high school student studying electrostatics, I understand that the electric potential at a point closer to a charged particle, is nearly infinite, then why there exist a finite potential ...
Hufaiza Hufaiza's user avatar
0 votes
0 answers
13 views

Aqueous electrons in electrochemical cells

In the context of a zinc-copper electrochemical cell, zinc atoms at the anode are oxidized, releasing electrons and forming zinc ions that dissolve into the solution ($Zn(\text{s}) \rightarrow Zn^{2+}(...
Kris's user avatar
  • 841
0 votes
0 answers
35 views

Phenomenon causing Voltage in Batteries

I have a simple question: you can think of a charged particle as a particle with mass, and hence there will be an electric field surrounding the charge, which causes electric potential energy (if ...
V T Naveen Mugundh's user avatar
0 votes
1 answer
64 views

What is current density and is it a material property?

Current density has the units (Ampere/cm2) so by that is the total current flowing through a cross-section divided by the area of that cross-section. I'm working on developing a water electrolyzer ...
MJ392891's user avatar
0 votes
1 answer
55 views

Fuel Cell Operating Pressure

I have seen anecdotal testing of fuel cell stacks. Intended to demonstrate that their power output can be improved through the addition of a centrifugal blower. What are the limits associated with ...
Slartibartfast's user avatar
0 votes
0 answers
11 views

Effects of an electrode in a microchannel flow

I am working on modeling the effects of an electrode in a microchannel flow. I am a little confused about how to model this. I have two electrodes on the boundary. Do I add the electric field effects ...
Dilawar Niazi's user avatar
1 vote
4 answers
391 views

What is the true motivation behind diffusion of components in solution?

I am very well aware that chemical potential or concentration is typically said to be the reason for molecular diffusion but consider a case, We have a cube filled with gas containing minor amount of ...
Qwerty's user avatar
  • 719
0 votes
0 answers
15 views

Any method for measuring hydroxyl and hydroperoxyl radicals in water?

I am looking to irradiate water containing some amounts of iron and would like to measure the amount of hydroperoxyl and hydroxyl radicals produced in real time as a result of the irradiation. Is ...
Bon's user avatar
  • 1
0 votes
1 answer
84 views

How to determine the open circuit voltage of solar cells?

I am reading this paper which is about dye sensitized solar cell, but I do not understand its statement about the open circuit voltage of the cell (page 2242): In page 2242, the paper says that: The ...
蕭力諶's user avatar
  • 123
0 votes
0 answers
28 views

What determines the relevant surface area of the electrical conduction?

I'm using a four-probe system (nextron) to measure the voltage between the two points of my sample. Sample has a cylindrical shape and it's placed on its base inside the instrument. The probes are ...
Dario Mirić's user avatar
0 votes
1 answer
62 views

Pn junction and the structure of diodes

I've read the part about pn-junction from Manfred Albach's "Elektrotechnik" book and I've seen some resources online as well. However, there are a few questions that bother me and prevent me ...
Electricity's user avatar
1 vote
0 answers
26 views

What ionic compound has the lowest boiling point?

Defining a molecule as "ionic" when it has a net electronegativity difference greater than 1.7 on Pauling's scale, which ionic compound has the lowest boiling point? And when it evaporates, ...
Robert Goddard-Wright's user avatar
0 votes
0 answers
45 views

Interpretation of non-spontaneous Gibbs free energy

Good day guys, I was reading some books on physical thermodynamics, they explain that for system undergoing a chemical reaction whose $\Delta G < 0$ indicating that the reaction can then provide us ...
STOI's user avatar
  • 286
0 votes
1 answer
108 views

How do I calculate the electrical resistance for a sodium chloride solution? [closed]

Im doing a paper on how the concentration of sodium chloride in water affects the electrical resistivity of the solution. My teacher told me that I may not be able to use $R = V/I$ for this as sodium ...
Alejo Ricarte's user avatar
1 vote
0 answers
31 views

Measurement of dipole electric field generated by a polar molecule

I'm trying to understand the nature of polar molecules. Have there been experiments where we can say to have actually measured the dipole electric field generated by a polar molecule such as hydrogen ...
Rudyard's user avatar
  • 780
-1 votes
1 answer
91 views

Why sodium ion is able to atract negative charges? [closed]

Why is the sodium ion able to attract negative charges? even though it has 1 excess proton, its electrosphere is further away than the nucleus, wouldn't it be possible to counterbalance the effect of ...
Gabriel Rocha Furtado's user avatar
1 vote
2 answers
192 views

Why chemical energy is doing the work on the electrons to move them from cathode to anode and not some kind of force?

We say that in an electrolytic cell the redox reactions occuring on the electrodes are exothermic and that chemical energy does work on electrons to move them from cathode to anode and this work done ...
Sukriti Sharma's user avatar
-4 votes
1 answer
127 views

Do chargeable batteries break the third law of newton? [closed]

When you charge a lithium battery for instance the electron momentum that coming out of the source is stored in the battery. The problem is that the direction of the electron might change when ...
daniel's user avatar
  • 149
0 votes
1 answer
34 views

How does Electron flow in Daniell cells in series look like?

After taking a look at this question: What causes the flow of electrons from anode to cathode in a Daniell cell? i was quite satisfied with answer provided there. One question that remained for me was ...
Hanni's user avatar
  • 1
0 votes
3 answers
325 views

Inverse relationship between salinity and conductivity?

I have a salt solution that is saturated at 40C, I measured conductivity and got 440 ms/cm. I then increased the temp to 50C, add more salt until the solution is saturated again, and measure ...
Hellocrystals's user avatar
0 votes
0 answers
15 views

Characteristics of melanin based semiconductors built from polydopamine

I am curious to know if the relatively newly developed melanin-based semiconductor materials made with polydopachrome have been able to create films or crystals which visually reflect blue, purple or ...
Upish's user avatar
  • 1
1 vote
1 answer
123 views

Why do my Milwaukee batteries weigh different amounts when charged vs uncharged

We use m12 small sized Milwaukee battery’s and I noticed when I use them I feel like they weigh different when using them sometimes while using them and then I read a article about batteries loosing ...
Kelton Clay's user avatar
0 votes
0 answers
42 views

Is anode to cathode ion movement due to binding energy and electrostatic field?

I'm trying to understand exactly what chemical and physical effects oxidise the Li atoms and make Li$^+$ ions move from anode to cathode on discharge, and to find numbers in terms of electrode ...
JWT239's user avatar
  • 11
0 votes
0 answers
135 views

Which electrode potentials govern Lithium-ion batteries?

I have a very basic question on why Li+ ions move from anode to cathode during discharge of lithium-ion batteries. Others have asked, but the explanations don't give electrode potentials. what ...
JWT239's user avatar
  • 11
2 votes
0 answers
40 views

How the potential difference (PD) between two electrodes changes with electrolyte concentration and distance? [closed]

I set up the following experiment I keep the black probe fixed to the left electrode. I moved the red probe at different points. I measure a voltage, basically the potential difference (PD) between ...
Krivan Semlani's user avatar
0 votes
2 answers
364 views

Salty water impedance vs. frequency

I was experimenting with measuring the dielectric constant of tap-water and also water with salt added. The measurement was done by submerging a simple cylinder capacitor into a container with the ...
JakobJ's user avatar
  • 101
0 votes
4 answers
107 views

What do these lines mean?

I am currently reading about emf and internal resistance and I came across this paragraph. What does this mean?
Sanjit Vignesh's user avatar
0 votes
2 answers
93 views

If earth water were pure, would the atmosphere still produce lightning?

Like the title says: If Earth’s water were composed of pure H2O molecules, without anything else dissolved in it, would the atmosphere still produce lightning? I remember that distilled water is not a ...
Alexander Xylona's user avatar
1 vote
1 answer
115 views

Galvanic cell - when do we get electric potential?

In the galvanic cell in this image (2nd one with salt bridge): Link Before putting the copper wire into the solution, do the Zn metal electrons have potential energy with respect to Cu2+'s electric ...
Omar Shekriladze's user avatar
28 votes
4 answers
5k views

How do batteries lose capacity in winter?

One problem of electric vehicles is that the battery capacity often shrinks under low temperatures. Some batteries can lose as much as 50% of capacity in winter. What I don’t quite understand is how ...
哲煜黄's user avatar
  • 1,455
0 votes
2 answers
54 views

How can I concentrate ions in a very small area?

I am interested in concentrating ions in a very small area, so the ion density of that region is elevated above normal levels. What is the field of study, or term, that describes what I am talking ...
Young Jun Lee's user avatar
0 votes
1 answer
170 views

Voltage and electron flow in battery

I just had a few confusions with battery voltage and overall how it worked. I tried searching online but the answers were so general they didn't explain "why". To start when we are using up ...
user avatar
12 votes
3 answers
3k views

Can we call rusting of iron a combustion reaction?

In case of rusting of iron the chemical reaction is not fast enough. The oxygen used is not molecular oxygen from the atmosphere but it is the oxygen from water molecule. The reaction is not rapid and ...
Shinnaaan's user avatar
  • 1,357
4 votes
0 answers
97 views

Gibbs-Duhem equation and homogeneous function of mixed Euler order

My question is related to this article by Sorensen and Compan. The usual definition of an homogeneous function of order $\mathcal M$ is by the equation $f(\lambda \mathbf{x}) = \lambda^{\mathcal M} f(\...
hyportnex's user avatar
  • 19.7k
0 votes
1 answer
85 views

Confusion regarding the definition of electrochemical potential

I am having trouble understanding the concept of the electrochemical potential $\mu$. In my textbook the electrochemical potential is defined as $\mu=\frac{\partial G}{\partial n}$. It seems to me as ...
Kani Pen's user avatar
  • 331
0 votes
2 answers
59 views

Ni-Cd Battery discharge circuit model [closed]

I am struggling with deriving a set of equations to represent mathematical model of Ni-Cd battery, so would you give me a through explanation and proper textbook/reference articles.
2 votes
2 answers
2k views

What is the difference between ionic conductivity and electrical conductivity in an electrolyte?

If we apply an AC current to a conductor it creates an associated alternating magnetic field around it. That's the theory. Additionally, when a current passes through the conductor, there is some ...
Physther's user avatar
  • 564
1 vote
1 answer
121 views

Electrical resistance of sodium chloride solutions with varying temperature

I am doing an experiment where if I try to increase the temperature of the sodium chloride solution I have and then measure resistance, I would expect that the resistance will increase as there are ...
Aurora Borealis's user avatar
1 vote
1 answer
446 views

About a battery's positive terminal

Does the positive terminal of the battery mean that the concentration of electrons is more there. In some places people say that current moves from positive to negative and they call it a convention ...
KP Asks's user avatar
  • 13
2 votes
1 answer
287 views

What causes water to be non-ohmic?

Its been a while since I posted here about what I have been trying to find out regarding resistance of water at high voltages. I may seem oddly obsessed with this, but it is forming a big part of a ...
effectivedragon's user avatar
0 votes
0 answers
17 views

Pressure Drop as a Predictor of Degree of Electrochemical Machining?

I'm trying to get my head around the concept of electrochemical machining and if it would be possible to measure the pressure drop across a pipe as the process is ongoing at a given flow rate to ...
Linus's user avatar
  • 1
0 votes
1 answer
156 views

How water affects the resistance of a material at different voltages?

as I said before in recent science projects I have been studying the effect of water on the electrical resistance of materials that absorb water such as wood and sponge (the reason for the majority of ...
MasterofPhysics65's user avatar
1 vote
1 answer
80 views

How electrolytes conducts electricity?

While studying electrochemistry, I came across two key points that I'm unable to understand. why does DC alone break down the electrolytic liquid and b) Why doesn't AC do the same?
math and physics forever's user avatar
0 votes
1 answer
65 views

Force on a test charge inside a cell

Considering test charge inside a cell. Let the cell be in an open circuit. I know that a potential difference will develop between the two electrodes of the cell. If I take a test charge and place it ...
manjit singh's user avatar

1
2 3 4 5 6