Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [electrochemical]

10 questions
8
votes
7 answers

A battery is not connected to anything. Is there a voltage between its plus and minus poles?

Here's one mental picture of a battery: The electro-chemical reactions inside the battery happen only when there's a closed circuit. When you place a voltmeter across the poles, then you create a closed circuit (with very low current) - the…
John
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3
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2 answers

How can I make a huge ceramic chip resistor?

I'm an EE, not a physicist or chemist, so please forgive if this question is dumb. I need a resistor that can dissipate many kW for 10 us, followed by > 10 ms off time. Since the duty cycle is ~0.1%, I could use a wirewound rated for > 100 W, but…
James Strieter
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3
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2 answers

Why do positive terminals on DC devices exposed to water corrode more than negative terminals?

I'm a glaciologist working in Patagonia where everything is always wet. Often water makes its way into instruments, radios and other devices and I feel that always the positive terminals of batteries (and the circuitry connected to it) corrodes more…
Camilo Rada
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2
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1 answer

Best way to measure microvolt potentials in an electrolyte solution?

I wish to measure microvolt-level fluctuations in a small volume of electrolyte solution, currently saltwater. My existing setup works but has some strange data so I'm hoping someone with more experience can help me sort it out. Equipment I'm using…
drc
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1
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How to control the potential in multiple-electrodes (3 or more) in electrochemical cells?

Usually, in most cell designs, the concept of two-electrode design is the baseline. The two electrodes are anode and cathode where the electron transfer happens between them. However, I have been reading about 3 electrodes and 4 electrodes designs…
Anwar Elhadad
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1
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Why do sensors or biosensors use AC excitation signal and not square wave signal?

I have recently started looking into transducers to measure a natural physical phenomena. The sensors I read about, especially electrochemical sensors like interdigital electrodes use a sinusoidal signal to enable the sensor electrodes. I came…
David Norman
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What is the working principle of a potentiostat? What role does the reference electrode play?

I am trying to understand the working principle of a potentiostat instrument, which is used as impedance analyzer in a three-electrode cell system setup. By referring on the circuit below, any current contribution due to redox reaction is…
Idix
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Calculate complex impedance value from voltage in time domain waveform

I have problem. I was doing an electrochemical impedance spectroscopy (EIS) test on my Randles cell. simulate this circuit – Schematic created using CircuitLab The data from potensiostat's output is written in a .csv file. If we plot the .csv, it…
Prayander Sahatma Siahaan
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1 answer

Noise when measuring OCV in a battery using Arduino and Adafruit ADC

I want to measure the Open Circuit Voltage of an electrochemical battery. When I measure this voltage using a multimeter, I get the measure correctly (around 1.12 V and without noise). However, when I use an Arduino Mega with an Adafruit ADC1115, I…
bardulia
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How to block DC offset voltage on a potentiostat output?

I have an AUTOLAB potentiostat: working electrode (WE, Pt wire), counter electrode (CE, Pt wire), reference electrode (RE, Ag/AgCl solid state). I would like to capacitively couple the potentiostat and the three electrode cell system through the…
Ryksa
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