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P와 B 이온이 함유된 나노 티타니아 광촉매의 광 전기화학적 수소 제조 성능
곽병섭(Byeong Sub Kwak),최희찬(Hee-chan Choi),우재욱(Jae-wook Woo),이주승(Ju-seung Lee),안준범(June-bum An),류시경(Si Gyeong Ryu),강미숙(Misook Kang) 한국청정기술학회 2011 청정기술 Vol.17 No.1
본 연구에서는 보다 효율적인 광 전기화학적 수소제조를 위하여 광촉매로써 티타니아 골격에 positive-type 반도체로써 B 이온, negative-type 반도체로써 P 이온을 삽입하여 고온 고압에서 용매열(solvothermal)법으로 P- 그리고 B-TiO₂ 나노 입자를 제조하였다. 제조한 P-TiO₂와 B-TiO₂의 물리적 특성은 X-ray 회절분석법, 투과전자현미경, 자외선-가시선 분광광도계, 발광분광계를 통해 확인하였다. 메탄올/물 (1:1) 광분해 수소제조 실험 결과, 1.0 mol% B-TiO₂ 광촉매가 순수 anatase TiO₂ 광촉매보다 활성이 향상되었으며, 0.5 g의 1.0 mol% B-TiO₂ 촉매를 사용 한 경우 10시간 반응 시 0.42 mL의 수소가 발생되었다. For effectively photochemical hydrogen production, P (negative semiconductor) and B (positive semiconductor) ions (0.1, 0.2, 0.5, and 1.0 mol%) incorporated TiO₂ (P- and B-TiO₂) nanometer sized particles were prepared using a solvothermal method as a photocatalyst. The characteristics of the synthesized P- and B-TiO₂ photocatalysts were analyzed by X-ray Diffraction (XRD), Transmission electron microscopy (TEM), UV-visible spectroscopy (UV-Vis), and Photoluminescence spectra (PL). The evolution of H₂ from methanol/water (1:1) photo-splitting over B-TiO₂ photocatalysts was enhanced compared to those over pure TiO₂ and P-TiO₂ photocatalysts; 0.42 mL of H₂ gas was evolved after 10 h when 0.5 g of a 1.0 mol% B-TiO₂ catalyst was used.
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Ngo, Yen-Linh Thi,Hur, Seung Huyn Elsevier 2016 Materials research bulletin Vol.84 No.-
<P><B>Abstract</B></P> <P>The fabrication of highly sensitive gas sensors that can monitor environmental toxic gases, such as nitrogen dioxide (NO<SUB>2</SUB>), which is one the most harmful gases to human health, attracts considerable attention. In this study, a hybrid structure composed of reduced graphene oxide (rGO) and a p-type NiO hierarchical structure (NiO-rGO) is fabricated using a facile solution process. The morphology and surface properties are analyzed by Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy. The NO<SUB>2</SUB> sensitivity is enhanced by the high surface to volume ratio of the NiO hierarchical structures as well as the enhanced charge transfer of NiO to rGO. The fabricated sensor with a hierarchical NiO and rGO hybrid structure exhibiting high sensitivity and selectivity at a low temperature (100°C) with a rapid response time.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Low temperature operable and highly sensitive gas sensors were fabricated. </LI> <LI> The rGO plays important roles in effective charge transfer from NiO. </LI> <LI> The well-developed NiO flower structures on the rGO surface enhanced the sensitity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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홍성수,( Trinh Duy Nguyen ),이근대,안병현 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
In this study, monoclinic-tetragonal heterostructured BiVO4 was successfully synthesized by an EGME-H2O mixed solvothermal method and characterized by XRD, Raman, FE-SEM, TEM and UV-vis DRS. The results shown that the present of EGME play an important factor not only in the control of crystal morphology but also in the formation crystal phase of BiVO4. BiVO4 crystal with monoclinic-tetragonal heterophase structure could promote the separation of photogenerated electron-hole pairs, which shows high photocatalytic activitsy towards RhB photodecomposition under visible light irradiation, much better than single-phase monoclinic scheelite BiVO4. Besides, the surface morphology, crystalline phase, optical properties and photocatalytic activity of BiVO4 can be tuned by controlling the EGME/H2O volume ratio.
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