What is electrochemically active surface area?
Surface area measurements. To be clear, the electrochemically active surface area represents the area of the electrode material that is accessible to the electrolyte that is used for charge transfer and/or storage.
How do you calculate electrochemically active surface area?
You can integrate the adsorption-desorption peak from CV (around 0 to 0.3 V Vs RHE), it will be the charge of the double-layer, then divide by the scan rate and use the relation: 1 square cm of ECSA is equal to 210X10-6C (Coulomb) [1cm2/210X10-6C]. After that, you can divide by miligrams of your sample.
How to determine ECSA?
The most widely used method to quantify the ECSA is hydrogen underpotential deposition (HUPD). Here, the hydrogen desorption charge from a cyclic voltammogram is used to calculate the ECSA. CO stripping is another well-established way to measure the ECSA.
How do you find the double layer capacitance?
Take the current width of the CV (in amps, pick a point in the CV where there is no faradaic process occurring) and divide that by the scan rate of the CV (V/s). Amps is Coulombs/s divided by Volts/s = Coulombs / Volt which is Farrads.
What does cyclic voltammetry measure?
Cyclic voltammetry is an electrochemical technique for measuring the current response of a redox active solution to a linearly cycled potential sweep between two or more set values.
What is BET surface?
From Wikipedia, the free encyclopedia. Brunauer–Emmett–Teller (BET) theory aims to explain the physical adsorption of gas molecules on a solid surface and serves as the basis for an important analysis technique for the measurement of the specific surface area of materials.
What is electrochemically active?
Electrochemically active microorganisms (EAMs) are a group of microorganisms which are able to release electrons from inside their cells to an electrode or accept electrons from an electron donor. The way in which EAMs do this is called ‘extracellular electron transfer’ (EET).
What is Helmholtz double-layer?
Helmholtz double layer (HDL) refers to the structural representation of the accumulation of electrical charges present at the boundary of an electrode and electrolyte when they are in contact with each other. HDL is most readily identifiable in fluid-based mixture systems, such as paints used for corrosion prevention.
What is double-layer supercapacitor?
Supercapacitors, or electric double-layer capacitors (EDLCs), are the new generation of energy storage devices to store electrical charges and provide high power densities and long cyclic life compared to other storage devices (e.g., Li-ion, lead acid, and alkaline batteries).
What is the basic principle of cyclic voltammetry?
Cyclic Voltammetry: Principles, Setup, and Applications. Cyclic voltammetry is an electrochemical technique for measuring the current response of a redox active solution to a linearly cycled potential sweep between two or more set values.
What is the importance of cyclic voltammetry?
Cyclic voltammetry (CV) is a powerful and popular electro- chemical technique commonly employed to investigate the reduc- tion and oxidation processes of molecular species. CV is also invaluable to study electron transfer-initiated chemical reactions, which includes catalysis.
What is Langmuir surface area?
BET surface area is measured by specific surface area of the adsorbent. BET surface area is measured by using non-corrosive gases like N2, CO2, Ar etc. BET surface area depends on size and number of gas molecules adsorbed. Langmuir surface area depends on adsorption capacity of the adsorbent.
How to determine the electrochemically active surface area?
The ECSA value obtained from the hydrogen adsorption in the cathodic scan must agree with the value obtained from the hydrogen desorption in the anodic scan. After applying the CO-baseline correction, we found a ratio of ECSA ads /ECSA des = (0.93 ± 0.04).
What kind of voltammetry is used for ECSA?
With these modifications, H upd and CO stripping voltammetry can be used for metal-oxide supported platinum to yield true, reproducible and consistent values for the ECSA.
How is cyclic voltammogram recorded in co saturated electrolyte?
It was found that the cyclic voltammogram recorded in CO saturated electrolyte gives an improved baseline for the H upd analysis. For CO stripping, a novel baseline method was developed by performing a “CO stripping simulation” (COSS) experiment in CO-free electrolyte.
What is the electrochemically active surface area of platinum?
2 Electrochemical Society Active Member. The electrochemically active surface area (ECSA) of metal-oxide supported platinum catalysts as obtained from hydrogen underpotential deposition (H upd) and from carbon monoxide stripping experiments was investigated.