| Diamond is the most important superhard material with many unique properties. Synthesis of diamond is a persistent topic in material research, and many research concerns have been paid to the synthesis of diamond. This paper first reviewed the important progresses in the synthesis of diamond with emphasis on electrochemical synthesis of diamond.This paper studied the possibility of electrodeposition of diamond or diamond-like materials from NaCl-CCl4-[BMIM]BF4(ionic liquid) and CHC13— [BMIM]BF4 system by potentiostatic electrolysis method using a three-electrode configuration. The working electrode and the counter electrode are all Pt foil. The possibility of electrochemical synthesis of diamond from NaCl—CCl4—[BMIM]BF4 system under ambient temperature and pressure was first testified using linear sweeping voltammetry (LSV), X-ray diffraction(XRD), and Raman spectroscopy. It was found by LSV that CCl4 could be directly reduced on platinum working electrode without NaCl serving as electron medium. Through potentiostatic electrolysis, substance with black color formed on platinum working electrode. The three characteristic diffraction peaks of diamond could be observed in the XRD pattern with another compound of unknown composition also distinguishable. In the Raman spectrum, the characteristic absorbance peak of diamond at 1332 cm-1 was also detected. This suggested that diamond can be synthesized from CCl4— [BMIM]BF4 system electrochemically under ambient temperature and pressure. Although the linear sweeping voltammetry and other experiment phenomena confirmed the direct reduction of C2Cl6 on the working electrode, no solid product was obtained from electrolysis of C2C16—[BMIM]BF4. The products of CHCl3— [BMIM]BF4 system are sticky and soft. The three characteristic diffraction peaks of diamond could not be observed in the XRD pattern, and most of products are amorphous. This suggested that hydrogen in the hydrogen-containing precursor such as CHCl3 made the reduction...
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