"Less is more" is a word spoken by the famous German architect Meevan Vidal. This “less is more†design concept was borrowed from the electrocatalytic hydrogen evolution material design work. Recently, the electrocatalytic hydrogen evolution was completed by Deng Mingsen, associate professor of the Key Laboratory of Nanomaterials Simulation and Computation in Guizhou province, and Xiong Yujie and Jiang Jun team of China University of Science and Technology. The breakthrough in material design: Less is more was recently published in the German Journal of Applied Chemistry, Angewandte Chemie, and it was introduced in a closed form.
The electrocatalytic hydrogen evolution reaction is a cathodic process of hydrogen deposition corrosion on the surface of a metal electrode and is an important process for producing hydrogen in a reversible hydrogen fuel cell. Metal platinum is the most catalytically active metal material in this series of reactions, but its high cost has motivated people to find ways to reduce the amount of platinum. To date, the industry has not yet been able to develop technologies that reduce platinum levels and maintain high electrocatalytic activity.
Deng Mingsen, Xiong Yujie, and Jiang Jun team studied the interface of platinum and palladium by theoretical simulation methods and found that the difference in the work function between these two metals will lead to polarization on the surface of the platinum metal, thus accumulating negative charges on the surface of the metal and facilitating hydrogen evolution. The reaction occurred. Further size-dependent studies have shown that the polarization decreases as the thickness of the platinum layer increases, so the electrocatalytic hydrogen evolution performance can be regulated through platinum layer thickness control. Based on this finding, the researchers designed a platinum-palladium-graphene laminar composite structure and developed a synthetic method for accurately controlling the thickness of the platinum layer to produce a series of composite structures with adjustable platinum layers. As predicted by theoretical simulations, this series of composite structures exhibits tunable performance in the electrocatalytic hydrogen evolution reaction. When the platinum layer thickness is controlled within 4 atomic layers, the highest performance value is achieved, and the current at −300 mV is reached. Density 791 mA cm-2 and Tafel slope 10 mV decade-1 are far superior to current commercially available platinum carbon electrode materials.
According to reports, this breakthrough progress will enable the industry to greatly increase the electrocatalytic hydrogen evolution activity while reducing the amount of platinum metal used, paving the way for the development of low-cost, high-performance electrocatalytic materials. The findings of the study will help to deepen people's understanding of charge polarization behavior and mechanism in composite materials and also play an important role in the rational design of composite structure electrocatalysts. (Reporter Liu Zhiqiang)
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