Abstract
Abstract 1D α-hematite nanorods synthesized by a simple, scalable and novel green chemistry method exhibit fast kinetics of the interfacial Faradaic redox reaction yielding a specific capacitance of 140 F·g−1 when used as a battery-type electrode in a supercapacitor. Ample supply and environmental compatibility of the raw material suggest the use of this material. Insufficient stability suggest further investigations.
Highlights
Green chemistry routes to one-dimensional (1D) iron oxidebased nanomaterials are attractive because of their low environmental impact and the superior physicochemical properties of the products compared to two-dimensional (2D) and three-dimensional (3D) iron oxide nanoparticles. 1D iron oxides are categorized into nanorods, nanotubes, nanoneedles, nanofibers and nanowires
1D α-hematite nanorods synthesized by a simple, scalable and novel green chemistry method exhibit fast kinetics of the interfacial Faradaic redox reaction yielding a specific capacitance of 140 F·g−1 when used as a batterytype electrode in a supercapacitor
Rice starch acting as soft template in the fabrication process of the α-hematite nanorods was added at different percentages 0, 5, 10, 15 and 20% in solution
Summary
Green chemistry routes to one-dimensional (1D) iron oxidebased nanomaterials are attractive because of their low environmental impact and the superior physicochemical properties of the products compared to two-dimensional (2D) and three-dimensional (3D) iron oxide nanoparticles. 1D iron oxides are categorized into nanorods, nanotubes, nanoneedles, nanofibers and nanowires. Using a sol-gel process, Shivakumar et al [16] prepared porous hematite providing a capacitance of 193 F·g−1 with 92% capacitance retention after 1000 cycles. Various hematite morphologies were obtained by a solution-based precipitation process starting with iron oxalate [17] In this case, a maximum specific capacitance of 116.25 F·g−1 and moderate cycling stability were found. Carbon-coated hematite nanoparticles prepared in a one-step self-assembly process by Yan et al [27] provided a specific capacitance of 406.9 F·g−1 with 90.7% retention after 2000 cycles. Gannavarapu and Dandamudi [28] obtained a nano iron oxide supported on activated carbon composite showing a capacitance of 898 F·g−1 with 95% capacitance retention after 10000 cycles. A report on the green synthesis and extensive characterization of the material examined here has been provided elsewhere [36]
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