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"Less is more" is a word spoken by the famous architect Mies van der Veldow. This "less is more" design concept is to promote simple forms and oppose excessive flashiness, thinking that simple things often bring more people. Enjoyment. Can this design concept have reference value in the field of materials science? Recently, a work completed by Prof. Xiong Yujie’s team at the University of Science and Technology of China fully demonstrated the superiority of the “less is more†design in the design of electrocatalytic hydrogen evolution materials. This result was published in the German Journal of Applied Chemistry.
As we all know, hydrogen energy has a very high energy density and extremely low environmental pollution, which is crucial for the development of the use of clean energy. 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.
Researchers designed a platinum-palladium-graphene lamination composite structure for this bottleneck, and developed a synthetic method for precise control of the thickness of the platinum layer, thereby constructing a series of composite structures with a controlled thickness of the platinum layer. This series of composite structures exhibits tunable performance in the electrocatalytic hydrogen evolution reaction. When the thickness of the platinum layer is controlled in the range of 4 atomic layers, the highest performance value is achieved, and the current density at -300 mV is 791 mA cm-2 and Tafi. The 10mV decade-1 slope is far superior to the current commercial platinum carbon electrode materials.
Professor Jiang Jun of the Chinese University of Science and Technology Group studied the interface of platinum and palladium through theoretical simulation methods and found that the difference in the work function between the two metals could lead to polarization on the surface of the platinum metal, thereby accumulating negative charges on the surface of the metal and facilitating hydrogen evolution. The reaction occurred. Further size-dependent studies show that the polarization decreases with the increase of the thickness of the platinum layer, so the electrocatalytic hydrogen evolution performance can be regulated through the thickness control of the platinum layer in the experiment.
This advancement 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.
The above research work has been funded by the Ministry of Science and Technology's "973" program, the National Natural Science Foundation, the National Youth 1000-person Program, and the 100-person plan of the Chinese Academy of Sciences.
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