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RISS 인기검색어
- 검색키워드
- 저자 : Fray, Derek John (검색결과 4 건)
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Kim, Hyun-Kyung,Kamali, Ali Reza,Roh, Kwang Chul,Kim, Kwang-Bum,Fray, Derek John The Royal Society of Chemistry 2016 ENERGY AND ENVIRONMENTAL SCIENCE Vol.9 No.7
<P>A facile and scalable high-temperature molten salt method was used to synthesize a high-quality hierarchical carbon nanostructure consisting of graphene nanosheets and nanoscrolls with an interconnected network and high electrical conductivity. During the process, the intercalation of lithium and hydrogen from molten LiCl into graphite led to the formation of a coexisting graphene sheetscroll nanostructure. An electrode using the fabricated interconnected carbon nanostructure showed a highly reversible specific capacitance of 213 F g(-1) at 1 A g(-1), excellent capacitance retention (84.5% of the initial specific capacitance (1 A g(-1)) at 50 A g(-1)), and good cyclability (97.9% after 10000 cycles). Such remarkable electrochemical performance is desirable for supercapacitor/ultracapacitor applications.</P>
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Kamali, Ali Reza,Kim, Hyun-Kyung,Kim, Kwang-Bum,Vasant Kumar, R.,Fray, Derek J. The Royal Society of Chemistry 2017 Journal of materials chemistry. A, Materials for e Vol.5 No.36
<▼1><P>High quality graphene nanosheets produced in molten salts were found to be capable of wrapping silicon nanoparticles, leading to the fabrication of graphene encapsulated silicon nanoparticles with an excellent stable electrochemical performance as anode material for Li-ion batteries.</P></▼1><▼2><P>Graphite, which is commercially used as anode material in Li-ion batteries, has a low theoretical capacity of 372 mA h g<SUP>−1</SUP>, and therefore should be replaced by an alternative with high capacity and cyclability for the automotive and other applications. The new material should also be capable of being fabricated by energy efficient non-polluting methods at a reasonable cost. This paper reports on the fabrication of a graphene–silicon nanocomposite which meets all these characteristics. High quality graphene was scalably produced by exfoliation of graphite in molten lithium chloride. Graphene nanosheets produced were found to be capable of wrapping silicon nanoparticles injected into the molten salt, leading to the fabrication of graphene encapsulated silicon nanoparticles with a controllable chemical composition. The electrochemical performance of graphene encapsulated silicon nanoparticles was evaluated and compared with that of Si nanoparticles and mechanically blended Si/graphene. The graphene encapsulated silicon nanoparticles exhibited an excellent stable electrochemical lithiation/delithiation performance with the capacity value of about 2000 mA h per gram of silicon at a high current density of 0.5 A g<SUP>−1</SUP>. The nanocomposite sample containing 50 wt% Si showed a reversible capacity of 981 mA h g<SUP>−1</SUP> after 260 cycles. By increasing the amount of Si content of the nanocomposite to 91 wt%, the reversible stable capacity increased to 2217 mA h g<SUP>−1</SUP>, demonstrating the capability of the molten salt method to correlate the cost and electrochemical performance of the graphene–silicon nanocomposite product.</P></▼2>
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Electrochemical Reduction of Plutonium Oxide in Molten CaCl2-CaO
Arfon H. Jones,Robert Watson,Tim Paget,Rob Campbell-Kelly,Tom Caldwell,Derek J. Fray 한국방사성폐기물학회 2015 방사성폐기물학회지 Vol.13 No.S
Electrochemical reduction has previously been reported for uranium oxide and mixed oxide nuclear fuel (uranium oxide, plutonium oxide). The laboratory scale electrochemical reduction of plutonium oxide powder is demonstrated in CaCl2- 1wt%CaO. The plutonium oxide contained within a permeable steel basket cathode is sacrificed during the process. A graphite anode is also employed during the reduction, leading to a significant contamination of the product.
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A biocompatible implant electrode capable of operating in body fluids for energy storage devices
Chae, Ji Su,Heo, Nam-Su,Kwak, Cheol Hwan,Cho, Wan-Seob,Seol, Geun Hee,Yoon, Won-Sub,Kim, Hyun-Kyung,Fray, Derek John,Vilian, A.T. Ezhil,Han, Young-Kyu,Huh, Yun Suk,Roh, Kwang Chul Elsevier 2017 Nano energy Vol.34 No.-
<P><B>Abstract</B></P> <P>Implantable electronic medical devices (IEMDs) can potentially be used to solve various clinical problems including the monitoring of chronic diseases and electro-organ transplantation. Several recently introduced techniques based on implantable devices that exploit novel metal- or carbon-based hybrid materials are biocompatible owing to their encapsulation in nontoxic polymers. However, such techniques limit the correct functioning of implantable devices, resulting in frequent replacement, difficult miniaturization, and inflammatory side effects in the body. Here, we describe a new technique for application to IEMDs that is capable of providing energy storage using the natural ions of body fluids as electrolytes in a supercapacitor (or ultracapacitor). The system is constructed with a solar cell for energy harvesting and a supercapacitor for energy storage. We assembled IEMDs with two biocompatible electrodes, specifically, MnO<SUB>2</SUB> nanoparticles affixed to multi-walled carbon nanotubes as the positive electrodes and phosphidated activated carbon as the negative electrodes. From the obtained result, this work can be further extended to the use of rats. This technique avoids the problems of performance degradation and toxicity that normally limits the reaction that is permissible in extracellular fluid. We present this concept schematically. The two biocompatible electrodes were successfully implanted into the subcutaneous layer of a rat's skin with both electrodes showing stable performance in use as parts of a supercapacitor. These findings establish a platform for potential biocompatible materials for implantable energy storage devices.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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