Microwave Synthesis of SnWO4 Nanoassemblies on DNA Scaffold: A Novel Material for High Performance Supercapacitor and as Catalyst for Butanol Oxidation

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• 作者：Sivasankara Rao Ede ; Subrata Kundu
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2015
• 出版时间：September 8, 2015
• 年：2015
• 卷：3
• 期：9
• 页码：2321-2336
• 全文大小：1079K
• ISSN：2168-0485

文摘

Self-assembled, aggregated SnWO₄ nanoassemblies are formed by the reaction of Sn(II) salt and Na₂WO₄路2H₂O in the presence of DNA under microwave heating within 6 min. We have emphasized the natural properties of DNA with its ability to scaffold SnWO₄ nanoassemblies and examined the role of starting reagents on the particles鈥?morphology. The diameter of the individual particles is ultrasmall and varies from 鈭?鈥?.5 nm. The potentiality of the SnWO₄ nanoassemblies has been tested for the first time in two different applications, such as an anode material in electrochemical supercapacitor studies and as a catalyst for the oxidation of butanol to butanoic acid. From the supercapacitor study, it was observed that SnWO₄ nanoassemblies with different sizes showed different specific capacitance (C_s) values and the highest C_s value was observed for SnWO₄ nanoassemblies having small size of the individual particles. The highest C_s value of 242 F g^鈥? was observed at a scan rate of 5 mV s^鈥? for small size SnWO₄ nanoassemblies. The capacitor shows an excellent long cycle life along with 85% retention of C_s value even after 4000 consecutive times of cycling at a current density of 10 mA cm^鈥?. From the catalysis studies, it was observed that SnWO₄ nanoassemblies acted as a potential catalyst for the oxidation of butanol to butanoic acid using eco-friendly hydrogen peroxide as an oxidant with 100% product selectivity. Other than in catalysis and supercapacitors, in the future, the material can further be used in sensors, visible light photocatalysis and energy related applications.