Fudan University announced on the 26th that the team of Wu Renbing and Professor Fang Fang from the Department of Materials Science of the school has made new progress in high-efficiency non-precious metal hydrogen evolution electrocatalysts. Related research results have recently been published in the international journal "Advanced Materials".
Hydrogen energy is rich in raw materials, high in combustion value, and has zero pollution. It has high expectations from scientists and the public. To develop hydrogen energy technology, an indispensable step is to convert water into hydrogen through an electrochemical reaction. This is the hydrogen evolution reaction. However, the overpotential required for the hydrogen evolution reaction is higher, and it is necessary to add a catalyst to reduce the overpotential and increase the reaction rate. At present, precious metal platinum is the most outstanding catalyst, but it is difficult to enter large-scale applications. However, the transition group metal elements such as iron, cobalt, and nickel have a large catalytic gap compared with platinum, and the effect of this type of catalyst is not satisfactory.
The research team broke through the existing bottleneck of using transition metal nanomaterials to develop highly active hydrogen evolution electrocatalysts, and creatively prepared zero-dimensional cobalt nanoparticles, one-dimensional nitrogen-doped carbon nanotubes and two-dimensional graphene coupling graded Composite structure system to solve the problems of transition metals such as iron, cobalt and nickel nanoparticles that have strong adsorption of hydrogen atoms and are not easy to desorb, particles are easy to agglomerate, low specific surface area, and are unstable in the operating environment of electrolytes. The research results of catalytic activity and stability close to that of precious metal platinum are presented.
The system has high conductivity, rich porosity, high dispersion of cobalt nanoparticles and fully exposed active sites (cobalt-nitrogen-carbon), which makes it as an electrocatalyst for hydrogen evolution reaction in acid and alkaline electrolytes. The catalytic activity of hydrogen evolution is close to that of precious metal platinum-based catalysts.
Experts said that the breakthrough in the research of electrocatalysts for hydrogen evolution reaction has not only produced an important promotion of the optimization of hydrogen production technology by electrolyzed water, but also provided the possibility of extracting higher purity hydrogen on a large scale at low cost. The new results will provide more scientific research with a direction to replace expensive elements with cheap elements, and will also have a far-reaching impact on the clean energy industry, especially the field of hydrogen energy utilization. (Reporter Wang Chun from Zhong Chenzhou)
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