Novel approaches for high efficiency electrochemical energy storage devices based on DNAs and nanomaterials

J. Bae
Gachon University,
Korea

Keywords: DNAs, nanomaterials, lithium ion battery, supercapacitors

Summary:

In this talk, we present our approaches to realize high efficiency, high performance, next generation electrochemical energy storage devices based on DNAs and various nanomaterials. Firstly, novel electrochemical, battery-like capacitors using DNA-wrapped MWCNTs (denoted as CNT@DNA) as electrode materials are demonstrated. By using CNT@DNA, which were successfully assembled through a facial sonication treatment. as template, a NiCo2O4 nanoparticle-anchored composite NiCo2O4-CNT@DNA was fabricated through situ precipitation coating process. Subsequently, the NiCo2O4-CNT@DNA and NiCo2O4-CNT (prepared without DNA) were used as the cathode materials to fabricate supercapacitors with high capacitive performance. The result of electrochemical test shows a high specific capacitance of NiCo2O4-CNT@DNA electrode of 760.0 F/g at 5 mV/s, which is higher than that of NiCo2O4-CNT electrode. The cycling performance of the NiCo2O4-CNT@DNA electrode displays a capacitance retention of 96.2% after 5000 cycles at the current density of 5 A/g. Moreover, the NiCo2O4-CNT@DNA//AC asymmetric supercapacitor using NiCo2O4-CNT@DNA and activated carbon as the positive and negative electrode show a specific capacitance of 223.7 F/g and the maximum energy density of 69.7 Wh/kg at power density of 373.9 W/kg. The NiCo2O4-CNT@DNA//AC asymmetric supercapacitors integrated in series powered 5mm red, yellow and green light-emitting diode (LED). The results demonstrate that the DNA nanocomposites can be used as novel electrode materials for high performance electrochemical energy storages. Secondly, it is critical to explore various nanomaterials physically and chemically composited with DNAs to realize next generation energy devices. Our recent works on novel nanomaterials (nanocones, TiC nanostrucutres, and graphene quantum dots etc) which could maximize the performance of DNA-based energy devices will be presented.