Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
Publication date: 11th July 2022
Carbon nanostructured materials such as nanodiamonds and graphene are useful for various applications, but low-energy production technologies are incredibly challenging. Herein, the formation of nanodiamonds by an in-situ electrochemical reduction of acetic acid at room temperature on Ag electrocatalysts was investigated with various Ag(NO3) concentrations in the range of 0.005-0.05 M in the presence of water and [BMIM]+[BF4]- ionic liquid. As revealed by XRD, Raman, and TEM-SAED, nanodiamond with an average crystallite size of ~ 27 nm was clearly evidenced in the nanocrystalline carbon layers, which were grown on the crystallographic planes of the electrodeposited Ag clusters. Under the conditions used, the deposited Ag clusters became negatively charged and were responsible for reducing acetic acid and crystalline carbon growth. Increasing Ag concentration not only resulted in higher amounts of Ag being deposited but also created significant local pressure in atomistic level where the crystalline carbon was formed, which induced re-ordering of carbon atoms into nanodiamond structure. The in-situ electrochemical reduction has shown to be an effective ultra-low energy strategy to produce nanodiamonds under ambient conditions.
The PhD scholarship for N.H. from the Second Century Fund (C2F) Chulalongkorn University is gratefully acknowledged. The authors would like to thank the Research Team Promotion grant from the National Research Council of Thailand (NRCT), the Royal Society-Newton Mobility Grant, and the PMU-B for the e-Asia Joint Research Program.
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