期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 6, 期 12, 页码 16255-16266出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b03119
关键词
Deep eutectic solvents; Cobalt vanadate (CoV2O6); Metal speciation; Electrocatalyst; Oxygen evolution
资金
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [NRF-2016R1C1B2008694]
- Ministry of Education [2009-0093816]
- Nano-Material Fundamental Technology Development through NRF - Ministry of Science, ICT and Future Planning [2016M3A7B4909370]
In this study, the deep eutectic solvent (DES)-aided synthesis of gamma-CoV2O6 under modest reaction conditions using 1:1 choline chloride malonic acid was reported. In the presence of DES, the reaction occurred at a lower temperature (500 degrees C) compared with that of the respective conventional solid-state synthesis of metal oxides and also with the calcination process involving the metal salts, thereby decreasing the overall formation energy. Differential scanning calorimetry revealed a 2-fold decrease in the endo effect of the thermodestruction of DES, which was observed at a low temperature. The structural pathway taken during the phase and morphology formation was investigated by in situ and ex situ X-ray diffraction (XRD) analysis, Raman spectroscopy, and scanning electron microscopy. The in situ XRD results confirmed the presence of high-temperature alpha-CoV2O6, which was finally converted to alpha-CoV2O6. On account of the metal speciation in DES similar to the biotemplate, well-defined octahedral CoV2O6 nanocrystals were obtained, which exhibited a remarkable OER catalytic activity at current density of 10 mA/cm(2) with an overpotential of a mere 324 mV, with excellent durability for greater than 24 h. Thus, a designer DES solvent with characteristics of biodegradability, cost-effectiveness, and renewability demonstrates potential for the synthesis of noble-metal-free oxygen evolution reaction (OER) catalysts, which allows the present synthesis route to fit well within the merits of green chemistry.
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