Until a couple of weeks ago, many people may not have even heard of Nyquist. However, if you are an electrochemist the name Nyquist has a meaning unknown to many. The Nyquist frequency is named after electronic engineer Harry Nyquist.
“Whilst electrochemistry has been around for a long time it is a powerful tool for nanotechnology because it’s so finely tuneable” A simple electrochemical method has been used to tune the electrical and mechanical properties of graphene. AsianScientist (Aug. 11,
Detects Diseases, Measures Biomarkers, Costs $25 In advanced industrialized nations most diagnostic tests that check body fluids for markers of disease make use of specialized sensors and devices that, although they deliver accurate results, can be very expensive. Now researchers
Take two different metals, place an ion transporting medium between them, wire them up to be connected outside the electrolyte solution (perhaps to a voltmeter or potentiostat) and you’ve made a battery. With the ever-increasing demand for portable power, batteries
Ohio University Electrochemical Engineering Research Center Receives $379,000 NIST Grant .S. Department of Commerce and National Institute of Standards and Technology (NIST). The award will be used to establish a consortium to support, sustain, and enhance U.S. manufacturing capacity in
Room temperature ionic liquids or simply ionic liquids (some even call them molten salts) can act as a great solvent for electrochemistry but they bring along a challenge of what to use for the reference electrode. Traditional saturated calomel or
A Common Potentiostat Design This style of I/E Converter is well suited to potentiostats with output currents of a few tenths of an ampere up to several amperes. This scheme has been used by Gamry, PAR, Solartron, and perhaps others.
The Classical Potentiostat The schematic at the right is the classical potentiostat design shown in nearly every modern electrochemistry textbook. It has three basic features. The Working electrode is at Virtual Ground. The working electrode is at the same potential
In the previous post (Electrochemical Corrosion Measurements Primer) we pointed out that Icorr cannot be measured directly. In many cases, you can estimate it from current versus voltage data. You can measure a log current versus potential curve over a
Most metal corrosion occurs via electrochemical reactions at the interface between the metal and an electrolyte solution. A thin film of moisture on a metal surface forms the electrolyte for atmospheric corrosion. Wet concrete is the electrolyte for reinforcing rod
The Quartz Crystal Microbalance (QCM) is an exciting tool for the electrochemist. With it, the researcher can now follow not only the current that flows, but the weight changes of the electrode, too! This is a valuable tool when studying
One guideline that I have heard recommended (although I cannot give a reference for it) is that data over a decade range of frequency is required to support each circuit component. All curve-fitting software should report some measure of the