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RISS 인기검색어
- 검색키워드
- 저자 : Hooch Antink, Wytse (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Hooch Antink, Wytse,Choi, Yejung,Seong, Kwang-dong,Piao, Yuanzhe Elsevier 2018 Sensors and actuators. B Chemical Vol.255 No.2
<P><B>Abstract</B></P> <P>In this work, a CuO/Ag composite electrode was fabricated using precursor type ink. The hybrid ink contains both Ag and Cu precursors and fully decomposes at 150°C in ambient atmosphere and was used to make a CuO/Ag electrode. The addition of the copper precursor to the silver ink resulted in an improvement of the electrocatalytic performance towards the reduction of hydrogen peroxide (H<SUB>2</SUB>O<SUB>2</SUB>). The fabricated electrodes were used to make an amperometric sensor which showed a linear response in a wide range and a low detection limit of 4.0μM (S/N=3). Additionally, the sensor displayed good anti-interference properties, repeatability and stability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CuO/Ag composite electrodes were prepared using a hybrid ink containing two precursors. </LI> <LI> The CuO/Ag electrodes were used for the electrochemical detection of H<SUB>2</SUB>O<SUB>2</SUB>. </LI> <LI> The Cu and Ag precursor ratio was optimized for a low limit of detection. </LI> <LI> The ink-based approach allows for a simple fabrication of electrodes. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Kim, Dongwon,Kim, Jong Min,Jeon, Youngmoo,Lee, Jeongyeon,Oh, Jiseop,Hooch Antink, Wytse,Kim, Daekyu,Piao, Yuanzhe Elsevier 2018 Sensors and actuators. B, Chemical Vol.259 No.-
<P><B>Abstract</B></P> <P>The determination of the concentration of acetaminophen (AC) in the human body is of significant importance to carefully monitor and regular drug safety and public health. However, most conventional methods are insufficient due to their time-consuming, expensive and complicated nature. In this study, we report a novel two-step activation of biomass-derived carbon for the electrochemical determination of AC. The electrode material is prepared by a two-step activation process, which involves the initial activation of kelp powder with ZnCl<SUB>2</SUB>, followed by an activation step with KOH. The activation procedure greatly increased the overall pore volume and specific surface area. The characterizations of ZnCl<SUB>2</SUB>-KOH activated kelp carbon (ZKAKC) were conducted with scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, Brunauer-Emmett-Teller (BET) surface area analysis, and electrochemical impedance spectroscopy (EIS). The electrochemical characterization of ZKAKC was performed with cyclic voltammetry (CV) analysis of potassium ferricyanide. The sensing ability of ZKAKC/GCE toward acetaminophen was conducted using CV analysis and differential pulse voltammetry (DPV). The modified electrode showed high sensitivity, selectivity and a good detection limit for the determination acetaminophen with the detection limit of 0.004 μM. Also, the modified electrode showed good result toward acetaminophen even in the presence of ascorbic acid and dopamine with the detection limit of 0.007 μM. For the evaluation of sensing ability as an actual electrochemical sensor, a real sample test was conducted. The electrochemical performance was enhanced due to the increased physical and electrochemical surface area, which occurred during the two-step activation process. This approach for producing activated carbon is crucial for future development and can be applied to different carbon source materials.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Activated carbon was prepared with a novel two-step activation process. </LI> <LI> Kelp is used as source material for the biomass-derived activated carbon. </LI> <LI> The modified electrode was used for the electrochemical determination of acetaminophen. </LI> <LI> High sensitivity toward acetaminophen and a low detection limit were achieved. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Hwang, Minsik,Kang, Jeongmin,Seong, Kwang-dong,Kim, Dae Kyom,Jin, Xuanzhen,Antink, Wytse Hooch,Lee, Chaedong,Piao, Yuanzhe Elsevier 2018 ELECTROCHIMICA ACTA Vol.270 No.-
<P><B>Abstract</B></P> <P>Ni-Co hydroxide nanoneedles embedded in graphene hydrogel are fabricated using an efficient two-step method and further explored as a binder-free electrode for high-performance asymmetric supercapacitors. First, freestanding graphene hydrogel is prepared via reduction in a mild condition. Second, Ni-Co hydroxide nanoneedles embedded in graphene hydrogel are obtained using a simple hydrothermal method. The existence of many hydrophilic functional groups in graphene hydrogel results in the generation of well-dispersed Ni-Co hydroxide nanoneedles throughout the graphene nanosheet. Moreover, the freestanding property of graphene hydrogel allows it to be used as a binder-free electrode, which can improve the energy density of the asymmetric supercapacitor without inhibiting its high power capabilities. The composite shows an excellent capacity of 544 C g<SUP>−1</SUP> at 2 A g<SUP>−1</SUP> in a three-electrode system. Moreover, the binder-free asymmetric supercapacitor achieves excellent performance with an energy density of 32.74 Wh kg<SUP>−1</SUP> at a power density of 320 W kg<SUP>−1</SUP> and good cycling stability with 85% capacitance retention at a current density of 10 mA cm<SUP>−2</SUP> after 5000 cycles. Therefore, the Ni-Co hydroxide nanoneedles embedded in graphene hydrogel have immense potential as electrochemically active materials for the development of high-performance supercapacitors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ni-Co hydroxide nanoneedles embedded in 3D graphene hydrogel were prepared by an efficient two-step method. </LI> <LI> The nanocomposite of Ni-Co hydroxide/graphene hydrogel was used as a binder-free supercapacitor electrode. </LI> <LI> The nanocomposite shows a high capacity of 544 C g<SUP>−1</SUP> at 2 A g<SUP>−1</SUP> in a three-electrode system. </LI> <LI> The asymmetric supercapacitor prepared by using the nanocomposite shows excellent power/energy density and cycling stability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The paper reported the Ni-Co hydroxide nanoneedles embedded in graphene hydrogel using facile two-step method. The asymmetric supercapacitor prepared by using the nanocomposite shows excellent energy density and cycling stability.</P> <P>[DISPLAY OMISSION]</P>
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