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Recently, Li Yue Group, a researcher in the Department of Micro-Nano Technology and Devices of the Institute of Solid State Physics, Chinese Academy of Sciences, Hefei Research Institute of Materials Science has made new progress in the construction and application of electrocatalytic electrode materials. The relevant research results are published in an international journal Journal of Materials Chemistry. A (J. Mater. Chem. A, 5, 11163-11170 (2017)).
Among the various renewable energy production and storage technologies currently being developed, the energy conversion and storage devices such as electrochemical water splitting and hydrogen production, fuel cells, and metal-air batteries have advantages such as high efficiency, simple structure, environmental friendliness, and wide application range. Widespread concern. Among them, the oxygen evolution reaction (OER) plays an important role in these energy conversion and storage devices. However, the overpotential of the OER process is very high and it needs to consume huge energy. It is necessary to reduce the OER overpotential through the catalyst. At present, the excellent performance of the catalyst is mainly based on germanium-based materials with low overpotential and high current density. However, due to the low content of niobium elements in precious metals, such materials are difficult to obtain large-scale industrial applications. Therefore, the development of efficient catalysts based on non-precious metals is imperative. Theoretical studies have shown that metallic cobalt (Co) and cobalt-based oxides have catalytic oxidation activity close to that of ruthenium-based materials. However, Co-based catalysts with a solid structure have a limited specific surface area and it is difficult to further increase their catalytic activity. Therefore, preparation of a hollow-structured Co-based catalyst is a very promising strategy.
In summary, the researchers of Li Yue's group used polystyrene (PS) spheres as templates to obtain high specific surface area hollow carbon-doped Co/Co3O4 hetero-composite nanomaterials through pyrolysis reduction. The composite material not only retains the spherical structure of polystyrene, but also has a high specific surface area and uniformly dispersed active sites, as shown in the following figure. Further research shows that the composite material constructed by this method has excellent electrical conductivity and catalytic ability, and has good cycle stability. The above research results have important significance for the design, large-scale preparation and application of high-performance energy conversion and storage materials.
The above research was funded by the National Natural Science Foundation of China and the Chinese Academy of Sciences’ technological innovation “crossover and cooperation team†projects.
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