• 제목/요약/키워드: Electrocatalytic

검색결과 219건 처리시간 0.025초

양자점 감응 태양전지의 Cu2S 상대 전극 제작조건 최적화 (Optimization of Fabrication Conditions for Cu2S Counter Electrodes of Quantum Dot-Sensitized Solar Cells)

  • 정성목;하승범;서주원;김재엽
    • 한국수소및신에너지학회논문집
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    • 제32권6호
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    • pp.663-668
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    • 2021
  • For the development of highly efficient quantum dot-sensitized solar cells (QDSCs), it is important to enhance the electrocatalytic activity of the counter electrodes (CEs). Herein, a fabrication process of Cu2S CEs are optimized for the development highly efficient QDSCs. The surface of brass film is treated with HCl solution to prepare the Cu2S CEs, and the concentraion as well as the temperature of HCl solution are controlled. It is found that the uniformity for the thickness of prepared Cu2S CEs is enhanced when the diluted HCl solution is used, compared to the HCl solution of standard concentration. In addition, the electrocatalytic activity of the Cu2S CEs is also increased with the modificed process, which is confirmed by impedance data and Tafel polarization curves. As a result, the photoconversion efficiency of QDSCs is improved from 4.49% up to 5.73%, when the concentraion and temperature of the HCl treatment are efficiently optimized.

High-valence Mo doping for promoted water splitting of Ni layered double hydroxide microcrystals

  • Kyoungwon Cho;Seungwon Jeong;Je Hong Park;Si Beom Yu;Byeong Jun Kim;Jeong Ho Ryu
    • 한국결정성장학회지
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    • 제33권2호
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    • pp.78-82
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    • 2023
  • The oxygen evolution reaction (OER) is the primary challenge in renewable energy storage technologies, specifically electrochemical water splitting for hydrogen generation. We report effects of Mo doping into Ni layered double hydroxide (Ni-LDH) microcrystal on electrocatalytic activities. In this study, Mo doped Ni-LDH were grown on three-dimensional porous nicekl foam (NF) by a facile solvothermal method. Homogeneous LDH structure on the NF was clearly observed. However, the surface microstructure of the nickel foam began to be irregular and collapsed when Mo precursor is doped. Electrocatalytic OER properties were analyzed by Linear sweep voltammetry (LSV) and Electrochemical impedance spectroscopy (EIS). The amount of Mo doping used in the electrocatalytic reaction was found to play a crucial role in improving catalytic activity. The optimum Mo amount introduced into the Ni LDH was discussed with respect to their OER performance.

Pt-Ru@TiO2-H 나노구조체촉매의 합성 및 전기화학적 특성평가 (Electrocatalytic activity of the bimetallic Pt-Ru catalysts doped TiO2-hollow sphere nanocomposites)

  • 이인호;권해두;최성호
    • 분석과학
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    • 제26권1호
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    • pp.42-50
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    • 2013
  • 이 논문은 센서 및 연료전지에 사용할 수 있는 $Pt-Ru@TiO_2-H$ 나노구조체촉매의 제조 및 전기화학적 촉매의 특성에 대한 것이다. 이 $Pt-Ru@TiO_2-H$ 나노구조체촉매는 주형제인 폴리스틸렌볼(PSB)을 제조하고, 이 주형제의 표면에 졸-겔 반응을 통해 $TiO_2$를 코팅한 후, $Pt^{4+}$$Ru^{3+}$의 환원에 의해 제조하였다. 제조된, $Pt-Ru@TiO_2-H$ 나노구조체촉매는 전자투과현미경(TEM), X-선 회절(XRD)와 원소분석에 의해 특성평가 하였고, $Pt-Ru@TiO_2-H$의 전기화학적 촉매특성은 에탄올, 메탄올, 도파민, 아스크로브 산, 프로말린과 글루코오즈의 산화-환원 능력에 의해 평가 하였다. 이 $Pt-Ru@TiO_2-H$ 나노구조체촉매는 바이오분자에 대해 전기화학적촉매 특성을 나타내어, 연료전지 전극 또는 비효소바이오센서에 사용 될 것으로 기대된다.

Electrocatalytic Reduction of Hydrogen Peroxide at Nanoporous Gold Surfaces

  • Park, You-Hoon;Kim, Jong-Won
    • 전기화학회지
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    • 제13권4호
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    • pp.251-255
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    • 2010
  • We report on the electrocatalytic reduction of hydrogen peroxide at nanoporous gold (NPG) surfaces. Various NPG surfaces with different surface structure were prepared by changing the conditions of electrodeposition for Ag-Au layers such as the concentration ratios of $KAu(CN)_2$ over $KAg(CN)_2$ and deposition charges. The effects of different electrochemical conditions on the electrocatalysis of $H_2O_2$ reduction were investigated. The NPG surfaces exhibited sensitive amperometric responses for $H_2O_2$ reduction, from which calibration plots with higher sensitivity than a bare Au surface were obtained.

Electrochemical Immunosensor Using the Modification of an Amine-functionalized Indium Tin Oxide Electrode with Carboxylated Single-walled Carbon Nanotubes

  • Aziz, Md.Abdul;Yang, Hae-Sik
    • Bulletin of the Korean Chemical Society
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    • 제28권7호
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    • pp.1171-1174
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    • 2007
  • We have developed an electrochemical immunosensor that combines the electrocatalytic property of carbon nanotube and the low background current of indium tin oxide (ITO) electrode. A partial monolayer of carboxylated single-walled carbon nanotube (CCNT) is covalently formed on an ITO electrode modified with amine-terminated phosphonic acid. Nonspecifically adsorbed avidin on the hydrophobic sidewalls of CCNT is used to immobilize biotinylated antibody and to reduce the nonspecific binding to CCNT. The biotinylated antimouse IgG bound on avidin and the antimouse IgG conjugated with alkaline phosphatase (ALP) sandwiches a target mouse IgG. ALP catalyzes the conversion of p-aminophenyl phosphate monohydrate into p-aminophenol, which is electrocatalytically oxidized to p-quinone imine on CCNT surface. Moderate electrocatalytic electrode obtained with the combination of CCNT and ITO allows low detection limit (0.1 ng/ mL).

Pyrocatechol Violet Modified Graphite Pencil Electrode for Flow Injection Amperometric Determination of Sulfide

  • Emir, Gamze;Karakaya, Serkan;Dilgin, Yusuf
    • Journal of Electrochemical Science and Technology
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    • 제11권3호
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    • pp.248-256
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    • 2020
  • In this study, pyrocatechol violet (Pcv) is proposed for the first time as an efficient electrocatalyst for oxidation of sulfide and flow injection analysis (FIA) of sulfide. A graphite pencil electrode (GPE) was modified with Pcv via immersion of the GPE into 0.01 M Pcv solution for 15 min. Cyclic voltammograms (CVs) demonstrated that Pcv/GPE exhibits a good electrocatalytic performance due to shift in the potential from +400 at bare GPE to +70 mV at Pcv/GPE and obtaining an enhancement in the peak current compared with the bare GPE. A linear range between 0.25 and 250 μM sulfide with a detection limit of 0.07 μM was obtained from the recorded current-time curves in Flow Injection Analysis (FIA) of sulfide. Sulfide in water samples was also successfully determined using the proposed FI amperometric methods.