Electrocatalytic Oxygen Production Performance of LaCoO3 System Optimizing the catalytic performance of transition metal oxides to achieve efficient electrolyzed water is a research difficulty in the current field of energy chemistry; regulating the spin states of electrons in conjunction with transition metal oxides is a classical subject in condensed matter physics. When the two meet, will you come across a "spark"? Recently, Zhou Shiming's research group and Zeng Jie's research group of the University of Science and Technology of China have worked closely with the research team of Hu Zhenluo of Nankai University to create opportunities for them in perovskite cobalt oxides and successfully capture the "sparks" they collided with. Relevant results were published in the Nature News (Nature Communications 7, 11510, 2016) published on May 17. Studies have shown that the catalytic performance of the electrolyzed water of transition metal oxides is closely related to its crystal structure and electronic structure. In particular, for transition metal oxides having a perovskite structure, the electrocatalytic oxygen generation performance is closely linked to the effective number of orbits in the 3d electrons of transition metal ions. When the effective electron filling of the eg orbit is about 1.2, its catalytic performance is best. As a typical electronic strong correlation system, perovskite transition metal oxides often exhibit a variety of strange electronic states, and their lattices, charges, spins, and orbits depend on each other. Moreover, the interaction between these degrees of freedom is quite similar in energy, and its electronic state is susceptible to various external fields such as magnetic fields, electric fields, temperature fields, pressure fields, etc., thus exhibiting the controllability of the external field of the electronic state. Researchers have provided ideas for regulating the electronic states of perovskite transition metal oxides. Based on this, Zhou Shiming's research group, Zeng Jie's research group and Hu Zhenyu's research group worked together to build a bridge between the spin state transition of LaCoO3 system and the optimization of the electrolysis water catalytic performance. By changing the size of the LaCoO3 nanoparticles, the researchers were able to fine-tune the spin-state transition behavior and successfully controlled the effective electron-filling of Co ions from 1.0 to 1.3. Especially when the particle size is about 80 nm, its orbital electron number is about 1.2, at which point the oxygen production catalytic performance is optimal, and it is comparable to other reported high performance catalysts with eg1.2 electron configuration. Peer review gave a high evaluation of the work, saying that “the task force is very interesting and the strategy for regulating catalytic performance is simple and clear, providing new ideas for optimizing the electrolyzed water catalytic performance by changing the electronic structure of the materialâ€. The study was supported by national major scientific research projects and the National Natural Science Foundation. PCM Home Appliance Color-Coated Sheet Construction Pcm Board,Pcm Color-Coated Sheet,Steel Pcm Board,Pcm For Home Appliance Shandong Wofeng New Material Co., Ltd. , https://www.wofengcoil.com
China University of Science and Technology, etc. based on fine tuning of spin states to achieve high efficiency electrolytic water catalytic oxygen production