Recently, Prof. GAO Minrui's group from the University of Science and Technology of China of the Chinese Academy of Sciences created the Turing structure on inorganic transition metal chalcogenides with the "reaction-diffusion" process for the first time. The results were published in German Applied Chemistry and the study was selected as Back Cover.
A cation exchange method was used by the researchers to produce Turing-type Ag2Se on CoSe2 nanobelts based on diffusion-driven instability.
In the binary solution of diethylenetriamine (DETA) and water, the inhibitor, Ag+ reacts with DETA to form Ag(DETA)+. At the same time, the activator, Co2+ overflows from the surface of the cobalt diselenide (CoSe2) nanobelt. When the rapidly diffused Ag(DETA)+ reaches the Nernst layer on the CoSe2 surface, it interacts with the activator Co2+ diffused on the CoSe2 surface, and finally forms a complex and beautiful Ag2Se Turing pattern on the CoSe2 surface.
This resultant Turing-type Ag2Se-CoSe2 material was an efficient oxygen evolution (OER) electrocatalyst. The intrinsic OER activity was linearly related to the length of Ag2Se-CoSe2 interfaces, indicating that this Turing-type interfaces are more active sites for OER.
The study uses the "reaction-diffusion" theory to construct complex Turing structures on inorganic nanostructured materials for the first time, and provides new ideas for the design of cheap catalysts with higher performance.86-10-68597521 (day)
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