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- 저자 : Gülten Atun (검색결과 2 건)
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Seda Polat,Gülten Atun 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-
The high capacitive, cost-effective, non-toxic nickel–cobalt layered double hydroxide nanofoampseudocapacitive electrode materials doped with aluminium (NiCoAl-LDH) have been hydrothermallysynthesized on the electrochemically modified graphite (G) substrate with zinc and copper (Zn/G and Cu/Zn/G). The Al3+ diffusion in the LDH during the hydrothermal synthesis resulted in an ultrathin nanofoammorphological structure well adapted to the entire surface of Zn/G and Cu/Zn/G. The high arealcapacitance of the best efficient NiCoAl-LDH/Cu/Zn/G electrode of 2.17 F cm 2 at 5 mA cm 2 decreases to1.83 mF cm 2 at 75 mA cm 2 showing an excellent rate capability of 84%. An asymmetric supercapacitor(ASC) designed with graphite as negative electrode exhibits an energy density of 29.3 Wh kg 1 at a powerdensity of 575 W kg 1. It still remains at 5.6 Wh kg 1 at a higher power density of 3477 W kg 1 at adischarge time of 5.8 s indicating ultra-fast energy storage ability of the G//NiCoAl-LDH/Cu/Zn/G device. Its cyclic tests were also made by constructing a coin-cell-type device for industrial applications. Thecapacitance of the coin-cell operating within 1.6 V was protected around 100% even after over 10,000charge–discharge cycles at the current densities up to 1.8 mA cm 2.
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Sibel Yazar,Ebru Kurtulbaş,Sinem Ortaboy,Gülten Atun,Selin Şahin 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.7
Olive leaves were extracted with homogenizer-assisted extraction (HAE). Box-Behnken (BBN) design was employed through response surface approach (RSA) to achieve the optimum conditions. Bioactivity of the extract was assessed by its oleuropein, total biophenol (TBC) and total flavonoid (TFC) content along with its antioxidant activity determined by DPPH and CUPRAC assays. A new nanocomposite was developed using reduced graphene oxide (rGO) modified with TiOx (Ti-rGO) for trace amount determination of oleuropein in olive leaf extract. Structural characterization of the electrode was clarified using atomic force microscopy (AFM) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) techniques. Cyclic voltammetry (CV) and square wave voltammetry (SWV) techniques were performed to investigate electrochemical behavior of oleuropein using three electrode configurations. Results of CV and SWV showed that quasi-reversible reaction occurred on electrode/electrolyte interface and a linear concentration range of 5-30 nM was obtained with a detection limit of 0.57 nM for oleuropein.
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