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• W4386854562 abstract "Introduction In order to achieve carbon neutrality by 2050, not only the CO 2 capture and storage (CCS) but also the CO 2 capture and utilization (CCU) is necessary. Here, electrochemical CO 2 conversion technology in molten salt is considered to be one of the promising candidates for CCU [1,2]. In this study, we aimed to convert CO 2 into diamond, which is one of the most valuable carbon materials. As a first step, we investigated the electrochemical synthesis of diamond in molten LiCl-KCl systems containing K 2 CO 3 and KOH, based on the premise that CO 2 dissolves as CO 3 2- in molten salts containing O 2- . As a result, micro-Raman spectroscopy and scanning electron microscopy (SEM) confirmed that a part of the deposits obtained by electrolysis were diamonds. As a second step, we attempted the electrochemical synthesis of diamond using CO 2 as the actual raw material. Here, H 2 O was also bubbled in the molten salt in order to produce KOH. The deposits obtained by electrolysis were then analyzed by micro-Raman spectroscopy and SEM, which confirmed the synthesis of diamond. Experimental Cyclic voltammetry and potentiostatic electrolysis were performed after adding K 2 CO 3 and KOH to LiCl-KCl eutectic melts under an Ar atmosphere at 973 K. The working electrode was a Ni flag (Φ 3 × 0.1 mm) or Ni plate (5 mm × 10 mm × 0.1 mm), the counter electrode was a glass-like carbon rod, and the reference electrode was an Ag + /Ag electrode. The potential was calibrated with Li + /Li potential. After electrochemical measurements were performed, samples were prepared by potentiostatic electrolysis using the Ni plate electrodes. In the case where CO 2 was used as a raw material, LiCl-KCl eutectic molten salt containing Li 2 O was prepared, and CO 2 and H 2 O were bubbled into it in predetermined amounts, respectively. After electrochemical measurements, potentiostatic electrolysis was performed to prepare samples. The obtained samples were analyzed by SEM, EDX, and micro-Raman spectroscopy. Result and Discussion First, electrochemical measurements in baths containing only K 2 CO 3 , only KOH, or both indicated that carbon deposition and hydrogen evolution proceed simultaneously in the potential range more negative than 1.2 V. Then, samples were prepared by potentiostatic electrolysis using Ni plate electrodes at 1.0 to 1.2 V (vs. Li + /Li). The charge density was unified at 10 C cm -2 . As an example, the surface SEM image of a deposit obtained at 1.1 V in a bath containing 0.05 mol% K 2 CO 3 and 1.0 mol% KOH is shown in Fig. 1(a). The EDX analysis of this area showed that only C and Ni from the substrate were detected. The result of micro-Raman spectroscopy of the sample is shown in Fig. 1(b), which shows a spectrum characteristic of diamond with a sharp peak at 1332 cm -1 . Based on the results of these three analyses, the electrochemically synthesized angular particles were identified as diamond. On the day of the meeting, we will also present the results of electrolysis using CO 2 as the raw material. Acknowledgment A part of this work was supported by JSPS KAKENHI Grant Number 21K19024. References [1] H. Yin, X. Mao, D. Tang, W. Xiao, L. Xing, H. Zhu, D. Wang, D. R. Sadoway, Energy Environ. Sci. , 6 , 1538 (2013). [2] Y. Chen, M. Wang, J. Zhang, J. Tu, J. Ge, and S. Jiao, J. Mater. Chem. A , 9 , 14119 (2021) Figure 1" @default.
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• W4386854562 date "2023-08-28" @default.
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• W4386854562 title "(Invited) Electrochemical Synthesis of Diamond from Carbon Dioxide in Molten Lithium Chloride-Potassium Chloride Systems" @default.
• W4386854562 doi "https://doi.org/10.1149/ma2023-01211525mtgabs" @default.
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