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Hydrogen evolution reaction (HER) is a chemical reaction that yields H 2. [1] The conversion of protons to H 2 requires reducing equivalents and usually a catalyst. In nature, HER is catalyzed by hydrogenase enzymes. Commercial electrolyzers typically employ supported platinum as the catalyst at the anode of the electrolyzer.
The platinum electrode common to much of electrochemistry is electrocatalytically involved in many reactions. For example, hydrogen is oxidized and protons are reduced readily at the platinum surface of a standard hydrogen electrode in aqueous solution, in a Hydrogen Evolution Reaction.
A schematic of a hydrogen fuel cell. To supply hydrogen, electrocatalytic water splitting is commonly employed. Hydrogen and oxygen can be combined through by the use of a fuel cell. In this process, the reaction is broken into two half reactions which occur at separate electrodes.
In electrochemistry, exchange current density is a parameter used in the Tafel equation, Butler–Volmer equation and other electrochemical kinetics expressions. The Tafel equation describes the dependence of current for an electrolytic process to overpotential.
Photocathode Reaction (Hydrogen Evolution): 2H++ 2e− → H2. 41598 2017 11971. These half-reactions show the fundamental chemistry involved in photoelectrolysis, where the photoanode facilitates oxygen evolution and the photocathode supports hydrogen evolution. Current Research and Technological Advances
In fact, its catalytic activity is more effective than platinum, which is the best-known catalyst for the H 2 evolution reaction. [38] Among three different types of hydrogenases, [FeFe] hydrogenases is considered as a strong candidate for an integral part of the solar H 2 production system since they offer an additional advantage of high TOF ...
Simple scheme of the apparatus for electro-oxidation process. The set-up for performing an electro-oxidation treatment consists of an electrochemical cell.An external electric potential difference (aka voltage) is applied to the electrodes, resulting in the formation of reactive species, namely hydroxyl radicals, in the proximity of the electrode surface. [11]
The Wood–Ljungdahl pathway is a set of biochemical reactions used by some bacteria. It is also known as the reductive acetyl-coenzyme A ( acetyl-CoA ) pathway . [ 1 ] This pathway enables these organisms to use hydrogen ( H 2 ) as an electron donor , and carbon dioxide (CO 2 ) as an electron acceptor and as a building block for biosynthesis .