http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Oh, Kyu Hyun,Gund, Girish Sambhaji,Park, Ho Seok The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.44
<P>We demonstrate nickel cobaltite@reduced graphene oxide (NiCo2O4@rGO) hybrid architectures directly deposited on nickel-foam (NF). The rGO interlayers restrict the growth of NiCo2O4 nanoneedles into smaller and thinner dimensions compared to NiCo2O4 without rGO layers, providing kinetic and structural stability for hybrid architectures. Accordingly, the NiCo2O4@rGO hybrid on NF achieves a specific capacitance of 1427 F g<SUP>−1</SUP> at 8 A g<SUP>−1</SUP>, a coulombic efficiency of 96.2%, and a capacitance retention of 83.8% over 10 000 cycles, which are greater than 1036 F g<SUP>−1</SUP>, 89.1%, and 40.8% of NiCo2O4 on NF in an aqueous 2 M KOH electrolyte. In order to enlarge the potential window of the aqueous system, hybrid supercapacitors (HSCs) are configured using the NiCo2O4@rGO hybrid on NF as a positive electrode and rGO on NF as a negative electrode. The HSCs exhibit a good cycling stability of 81.1% over 10 000 cycles, delivering maximum energy and power densities of 25.24 W h kg<SUP>−1</SUP> and 21.42 kW kg<SUP>−1</SUP>.</P>
Supriya Bapurao Jambure,Girish Sambhaji Gund,Deepak Prakash Dubal,Sujata Sureshrao Shinde,Chandrakant Dnyandev Lokhande 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.5
Synthesis of titanium dioxide (TiO2) nanograins using economical successive ionic layer adsorption and reaction(SILAR) method has been carried out. TiO2 thin films are studied for their structural, compositional, optical andmorphological properties. A layer by layer process leads to the formation of 2.4 μm thick nanocrystalline TiO2film. The heat treated TiO2 thin films are hydrophilic in nature with contact angle of 67°. The interconnectednanograins are employed for dye sensitized solar cells (DSSC) using inexpensive Rose Bengal (RB) dye. RB dyesensitization resulted into shifting of absorption peak from UV to visible region. The photoresponce of the dyesensitized solar cell is evaluated in the polyiodide electrolyte (0.1 M KI + 0.01 M I2) at 40 mWcm−2 illuminationintensity. The TiO2 nanograins accompanied with RB sensitizer showed the conversion efficiency (η) of 0.89%. These results depict the strong assurance of TiO2 nanograins for DSSC application.
Surface and diffusive capacity controlled electrochemistry in nickel boride/nickel borate
Vinit Kaluram Kanade,Chaitanya Kaluram Kanade,Rahul B. Pujari,Dong-Weon Lee,Girish Sambhaji Gund,김태성 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
Electrochemical energy storage devices have attracted considerable attention because of their ability tosupply high energy and power in energy management systems. In this work, we synthesized highly electrochemicallyactive nickel boride/nickel borate (NixB/NiBxOy) composite materials using a chemicalcoprecipitation method. The variation of precursor solution’s concentration controlled the chemical, morphological,surface area and structural properties of composite material. The electrochemical measurementsof NixB/NiBxOy material display a high charge storage capacity of 201.5 mAh/g at 5 mV s1scan rate amongst the different concentration. The charge storage capacity, rate capability and cycle stabilityof NixB/NiBxOy materials were effectively controlled by the material composition, structure, size,surface area and porosity feature through the charge kinetics, surface and diffusive capacity contributionand the battery–type charge storage mechanism. These findings provide an important insight to controlelectrochemical properties by optimizing the physical and chemical features of battery–type material.