Question

Mention the Difference between zn and N2​

Answer 1

Answer:

Identification of active sites is one of the main obstacles to rational design of catalysts for diverse applications. Fundamental insight into the identification of the structure of active sites and structural contributions for catalytic performance are still lacking. Recently, X-ray absorption spectroscopy (XAS) and density functional theory (DFT) provide important tools to disclose the electronic, geometric and catalytic natures of active sites. Herein, we demonstrate the structural identification of Zn-N2 active sites with both experimental/theoretical X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectra. Further DFT calculations reveal that the oxygen species activation on Zn-N2 active sites is significantly enhanced, which can accelerate the reduction of oxygen with high selectivity, according well with the experimental results. This work highlights the identification and investigation of Zn-N2 active sites, providing a regular principle to obtain deep insight into the nature of catalysts for various catalytic applications

Explanation:

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Answer 2

Results

Synthesis and structural characterization

Figure 1 shows typical structures of active sites of TMNC catalysts. With different coordination environments, the electronic and geometric structures of the active sites are largely different. Importantly, differences of the electronic and geometric structures can lead to diverse adsorption behaviours, which play key roles in the performance of catalysts. To begin with, Zn-based TMNC material (ZnNC) was prepared by thermal treatment of Zn-containing hybrid precursor in an argon atmosphere at 800 °C for 6 h (Supplementary Fig. 1). According to reported works, prolonged higher temperature pyrolysis can result in the vanish of Zn22.