Three-Dimensional Nanoarchitecture of BiFeO3 Anchored TiO2 Nanotube Arrays for Electrochemical Energy Storage and Solar Energy Conversion

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• 作者：Ayan Sarkar ; Ashutosh K. Singh ; Debasish Sarkar ; Gobinda Gopal Khan ; Kalyan Mandal
• 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：2254-2263
• 全文大小：652K
• ISSN：2168-0485

文摘

Here, we report the synthesis of TiO₂/BiFeO₃ nanoheterostructure (NH) arrays by anchoring BiFeO₃ (BFO) nanoparticles on TiO₂ nanotube surface and investigate their pseudocapacitive and photoelectrochemical properties considering their applications in green energy fields. The unique TiO₂/BFO NHs have been demonstrated both as energy conversion and storage materials. The capacitive behavior of the NHs has been found to be significantly higher than that of the pristine TiO₂ NTs, which is mainly due to the anchoring of redox active BFO nanoparticles. A specific capacitance of about 440 F g^鈥? has been achieved for this NHs at a current density of 1.1 A g^鈥? with 鈭?0% capacity retention at a current density of 2.5 A g^鈥?. The NHs also exhibit high energy and power performance (energy density of 46.5 Wh kg^鈥? and power density of 1.2 kW kg^鈥? at a current density of 2.5 A g^鈥?) with moderate cycling stability (92% capacity retention after 1200 cycles). Photoelectrochemical investigation reveals that the photocurrent density of the NHs is almost 480% higher than the corresponding dark current and it shows significantly improved photoswitching performance as compared to pure TiO₂ nanotubes, which has been demonstrated based the interfacial type-II band alignment between TiO₂ and BFO.