Electrochemical Hydrogenation
Electrochemical Hydrogenation - Related Videos
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Electrochemical biosensors detect the binding of a target molecule by sensing an oxidation-reduction event. These sensors paved the way for modern biosensing after the invention of the glucose biosensor. This video will introduce electrochemical biosensing, show the workings of the glucose biosensor, and discuss how electrochemical biosensors are used in cancer detection.
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Hydrogenation
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2023
Source: Vy M. Dong and Zhiwei Chen, Department of Chemistry, University of California, Irvine, CA This experiment will demonstrate the hydrogenation of chalcone as an example of an alkene hydrogenation reaction (Figure 1). In this experiment, palladium on carbon (Pd/C) will be used as a heterogeneous catalyst for the process. A balloon will be used to supply the hydrogen atmosphere. Figure 1: Diagram showing the hydrogenation of chalcone to 3-phenylpropiophenone.
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We demonstrate the extraction of ammonium from an ammonium-rich stream using an electrochemical and a bioelectrochemical system. The reactor setup, operation and data analysis are discussed.
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Electrochemical Measurements of Supported Catalysts Using a Potentiostat/Galvanostat
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2023
Source: Laboratory of Dr. Yuriy Román — Massachusetts Institute of Technology A potentiostat/galvanostat (often referred to as simply a potentiostat) is an instrument that measures current at an applied potential (potentiostatic operation) or measures potential at an applied current (galvanostatic operation) (Figure 1). It is the most commonly used instrument in the electrochemical characterization of anode and cathode materials for fuel cells, electrolyzers, batteries, and supercapacitors.
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Electrochemical Impedance Spectroscopy
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2023
Source: Kara Ingraham, Jared McCutchen, and Taylor D. Sparks, Department of Materials Science and Engineering, The University of Utah, Salt Lake City, UT Electrical resistance is the ability of an electrical circuit element to resist the flow of electricity. Resistance is defined by Ohm's Law: (Equation 1) Where is the voltage and is the current. Ohm's law is useful for determining the resistance of ideal resistors. However, many circuit elements are more complex and can't be described by...
FAQs
At the cathode, the applied potential supplies the driving force for electron transfer to the substrate. Protons or water then act as sources of hydrogen equivalents, allowing the unsaturated bond to be reduced without treating hydrogen gas as the sole hydrogen source. This coupling of electron delivery and hydrogen supply determines whether conversion can proceed under the selected reaction conditions.
Electrocatalysts help govern both kinetics and selectivity. By facilitating the relevant interfacial reaction, they can influence how rapidly the substrate is converted and which functional group is reduced preferentially. Their role also affects energy efficiency, so catalyst choice is not merely a rate consideration. In practice, catalyst behavior must be matched to the substrate and operating conditions.
Unlike a process that depends solely on pressurized hydrogen gas, electrochemical hydrogenation uses an applied potential to provide the reducing force. This makes the electrical input a controllable reaction variable, while protons or water supply hydrogen equivalents. When electricity comes from renewable energy, the approach can connect chemical synthesis with renewable-energy-driven transformations, supporting sustainable chemistry.
The supported substrate range includes alkenes, alkynes, carbonyl compounds, and other functional groups. These targets do not necessarily respond identically, so the selected potential, hydrogen-equivalent source, electrocatalyst, and reaction conditions must be matched to the substrate. Such tailoring is important when the desired outcome is selective reduction rather than broad, uncontrolled conversion.
A basic experimental design brings together a cathode, the substrate, an applied electrical potential, a source of hydrogen equivalents such as protons or water, and an electrocatalyst. The electrolyte is part of the reaction environment, while the potential and other conditions are adjusted for the chosen substrate. These elements collectively determine reaction rate, selectivity, and energy efficiency.
Its applications include sustainable chemical synthesis, biomass upgrading, pharmaceutical intermediate production, and industrial chemistry. The method is especially relevant when researchers want to reduce unsaturated compounds while using electrical input as part of the reaction design. Its connection to renewable-energy-driven transformations also gives it importance in efforts to link synthesis with alternative energy sources.