Tungsten Oxide Electrocatalytic Hydrogen Evolution

Hydrogen production hydrogen reaction speed depends very much on the electrocatalyst. To adapt to industrial production, electrocatalysts not only have a low overpotential, but also to the low price, rich in content and to have good cycle stability and catalytic stability. Tungsten oxide is one of the materials commonly used as a hydrogen evolution reaction electrocatalyst. Compared with Pt and other metals, it is cheap and rich in content. And tungsten oxide can form tungsten bronze with high electron and proton conductivity in a sulfuric acid electrolyte.

Tungsten oxide electrocatalytic hydrogen evolution process is also divided into two steps: First, tungsten oxide adsorption of hydrogen ions and electrons, and then decompose to generate hydrogen. Like when used as a photocatalyst, conventional tungsten oxide used as an electrocatalyst has some disadvantages. Therefore, through the morphology control, heteroatom doping, the formation of oxygen vacancies and other ways, the tungsten oxide material has more active sites and proton transport channels. At the same time, it can reduce its overpotential and enhance its electrocatalytic hydrogen evolution performance. Ion doping also contributes to improve the electrocatalytic hydrogen evolution activity of tungsten oxide materials. Sub-stoichiometric tungsten oxide also enhances the electrocatalytic hydrogen evolution activity due to the presence of oxygen vacancies.

Tungsten oxide samples exhibit higher electrocatalytic hydrogen evolution activity because of the oxygen vacancies contained in the tungsten oxide structure. Promote the transport of electrons and ions diffusion, is conducive to hydrogen adsorption and desorption. The special nanowire structure allows the tungsten oxide sample to have a large specific surface area, thereby providing more active sites.

• < Prev
• Next >