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류경범,백건욱,황태원,박성주,한윤수 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
It is well known that TiO<sub>2</sub> nanoparticles have strong adsorption capacities of metal ions. In this study, the metal-ion-adsorbing ability of TiO<sub>2</sub> was utilized to reduce the dye adsorption time in the manufacturing process of solar cells. To incorporate the metal ions on the TiO<sub>2</sub> surface, the bare TiO<sub>2</sub>/FTO was soaked in an aqueous solution of metal salt, then rinsed with water and dried. When the positively charged TiO<sub>2</sub> layer was dipped into dye solution, it could attract negatively charged dyes by electrostatic interaction. Thus, we could reduce the dye-adsorption time without declining the power conversion efficiency of solar cells.
류경범,박성주,성혜경,최근영,윤상훈,김종태,한윤수 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
In our previous report, zinc sulfate (ZS) modification of the photoelectrode surface led to a reduction in the short circuit current (Jsc) value, thereby decreasing the overall power conversion efficiency (PCE) of the dye-sensitized solar cell (DSSC), compared to that of reference device. It was also revealed that the amount of adsorbed dyes was decreased by the presence of ZS on the photoelectrode. We believe that ZS incorporated on the surface of TiO<sub>2</sub> would prevent the adsorption of dyes. Therefore, in order to minimize the reduction of light harvesting efficiency, it is necessary to reduce the amount of ZS on the TiO<sub>2</sub> surface. We thus used a diluted ZS solution to modify the TiO<sub>2</sub> surface, instead of 50mM solution. As a result, without loss of the Jsc value, an enhancement in PCE was achieved in the DSSC, due to an increase in the open circuit voltage.
황태원,류경범,박성주,최주연,여인영,한윤수 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
We have modified TiO<sub>2</sub> surfaces using aqueous sodium hydroxide (NaOH) solution at different solution temperatures and soaking time via a simple dip coating process, and the resulting electrodes (SH-TiO<sub>2</sub>/ FTO) were used as a electron transporting layers of solar cells. The device with bare-TiO<sub>2</sub>/FTO showed the performance with Voc=0.59 V, Jsc=18.84 mA/㎠ and FF=61.28%, which leads to a power conversion efficiency (PCE) of 6.80%, whereas, for the device with SH(40/10)-TiO<sub>2</sub>/ FTO prepared by surface treatment at 40°C for 10 min, the PCE was increased to 7.60% (Voc = 0.72 V, Jsc = 17.52 mA/㎠ and FF = 61.81%) due to an increase in Voc by more than 22%.
2P-518 Fabrication of ZnO μ-rods and photovoltaic properties of solar cells with them
최근영,류경범,박성주,윤상훈,성혜경,조성일,김지영,한윤수 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
ZnO microrods with a thickness of about 8 ~ 18 μm have been prepared by chemical bath deposition technique for applications to photoelectrodes of dye-sensitized solar cells (DSSCs). With increasing the thickness of ZnO microrods, the open circuit voltage (Voc) values of the DSSCs were increased, but a decrease in the short circuit current (Jsc) was observed in over 8hr of dipping time in zinc nitrate solution. By monitoring changes in dark current and electrochemical impedance, it was revealed that the increase in Voc was attributed to the suppression of the charge recombination between injected electrons and I<sub>3</sub><sup>-</sup> ions, probably due to an reduction in the surface area of ZnO microrods. This reduction of the surface area would lead to a decrement of dye contents adsorbed on ZnO microrods, resulting in the decreased Jsc value.
박성주,백건욱,류경범,황태원,이상주,한윤수 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Zinc oxide (ZnO) has a band gap energy of 3.3 eV, which is similar to that of TiO<sub>2</sub> used as a n-type semiconductor in solar cells, and has higher electron mobility than TiO<sub>2</sub>. Thus, ZnO film can act as the n-type semiconductor in solar cells. However, ZnO-based solar cells suffer from low power conversion efficiency, because Zn<sup>2+</sup>/dye complex is formed during prolonged sensitization process. The complex could hinder electron injection from excited dye to ZnO. In this study, electrophoretic technique was applied to increase dye-loading amount in a short sensitization time. The dye-loading amount by electrophoretic method for 20 min was increased by 2.18x10<sup>-5</sup>mol/㎤, compared to that (1.56x10<sup>-5</sup>mol/㎤) by conventional soaking process for the same time. This led to an increase in power conversion efficiency of ZnO-based solar cells.
황태원,백건욱,박성주,류경범,김지영,한윤수 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
The power conversion efficiencies of ZnO-based solar cells are considerably lower than those reported for TiO<sub>2</sub>. It is because Zn<sup>2+</sup>/dye complex is formed during prolonged sensitization process, and it lowers the electron injection efficiency from excited dye to ZnO. Thus, it is necessary to increase dye-adsorption amount in a short time. In this study, we investigated amount of dye-adsorption on metal-cation adsorbed ZnO surface. ZnO nanorods were soaked into aqueous solutions containing metal cations to produce positively charged ZnO surface, and then they were dipped into the dye solution to load dyes. As a result, dye-loading amount was increased by electrostatic interaction between positively charged ZnO and negatively charged dye, compared to that of the simple dipping process.
가교한 PI/PVDF 블렌드로부터 유도된 탄소 나노섬유 전극의 에너지 저장 특성
이도근(Do Geun Lee),류경범(Gyeong Beom Ryoo),정경혜(Kyung-Hye Jung) 한국고분자학회 2021 폴리머 Vol.45 No.6
슈퍼커패시터는 전극과 전해질 계면의 이온 접촉으로 에너지를 저장하기 때문에 전극의 표면적과 다공성이 에너지 저장 특성을 결정하는 주요 요인이다. 전극 물질로 탄소 나노섬유(CNF)가 많이 연구되고 있는데, 주로 전구체 고분자를 전기방사하고 열 처리하여 합성한다. 본 연구에서는 전구체 고분자의 화학 구조 조절을 통하여 탄소나노섬유의 에너지 저장 특성을 개선하였다. 방향족 폴리이미드(PI)와 폴리비닐리덴 플루오라이드(PVDF) 블렌드를 전구체로 사용하였고, 열처리 전 가교 처리를 하여 표면 특성을 개선하였다. 코인 셀을 조립하여 전기화학적 특성을 평가한 결과, 가교한 PI/PVDF로 합성한 CNF전극의 비정전용량이 322 F/g(10 mV/s), 에너지 밀도가 11.6 Wh/kg(0.5 A/g)로 가교를 하지 않은 전극 대비 높은 에너지 저장 특성을 보였다. Supercapacitor stores energy through the interfacial contact of ions between electrodes and electrolytes; thus, the surface area and porosity of electrode materials are critical to determining the energy performance of the supercapacitor. Carbon nanofibers (CNFs) have been widely investigated as supercapacitor electrodes, which are generally synthesized by thermal treatment of electrospun precursor polymer nanofibers. In this study, the energy storage performance of CNFs was improved by modifying the chemical structures of precursor polymers. A blend of aromatic polyimide (PI) and polyvinylidene fluoride (PVDF) was chosen as a precursor and it was crosslinked before thermal treatment to improve the surface properties. Electrochemical properties were measured by assembling coin cells, and CNF electrodes derived from crosslinked PI/PVDF exhibited a specific capacitance of 322 F/g (10 mV/s) and energy density of 11.6 Wh/kg (0.5 A/g), which showed significantly higher energy storage properties than those of non-crosslinked one.