【Frontiers in HaiChuan Technology】New \"armor\" for catalysts in electrocatalytic glycerol oxidation – copper ions boost conversion efficiency

Thread Content

According to the Institute of Metals, Chinese Academy of Sciences, its research team has made a breakthrough in the electrocatalytic oxidation of glycerol at industrial current densities. By adding trace amounts of copper ions to the reaction mixture, it is possible to effectively overcome the problem of catalyst failure under high industrial current densities, thereby significantly improving the efficiency and stability of the products. The relevant research findings were published on the 21st in the international academic journal Nature Sustainability. Glycerin, as a by-product of the biodiesel industry, can be upgraded through oxidation to become an important raw material for pharmaceuticals, food, skincare products, and fabrics. Traditional thermal-catalytic oxidation of glycerol is associated with significant pollution and high energy consumption. In contrast, electrocatalytic glycerol oxidation utilizes water as the oxidant and green electricity as the energy source, thus providing a new pathway for the eco-friendly upgrading of glycerol oxidation. However, the industrial application of electrocatalytic glycerol oxidation technology faces a major bottleneck: at industrial-level high current densities, common metal oxide catalysts such as cobalt and nickel tend to undergo oxidative amorphization, causing their surfaces to become loose and disordered, as if they had been \"electrolytically glued\" together. This not only significantly reduces the efficiency of producing the target product, but also wastes electrical energy and raw materials. To address this challenge, the research team added trace amounts of copper ions to the reaction solution. During the reaction, these copper ions can switch flexibly between two valence states; acting like a “dynamic armor,” they effectively maintain the crystalline structure on the catalyst surface, thereby preventing amorphization. Tests have shown that the introduction of copper ions significantly improves the yield of glycerol oxidation; on an electrode with a surface area of 6×6 square centimeters, 13.2 grams of oxidized products can be produced per hour, and the system can operate continuously and stably for over 100 hours, indicating its potential for industrial application on a large scale.