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Shin, Sun,Han, Hyun Soo,Kim, Ju Seong,Park, Ik Jae,Lee, Myeong Hwan,Hong, Kug Sun,Cho, In Sun The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.24
<▼1><P>A tree-like nanoporous tungsten trioxide (WO3) photoanode that largely improves the photoelectrochemical water-oxidation performance was synthesized by a laser ablation method.</P></▼1><▼2><P>We report a tree-like nanoporous tungsten trioxide (WO3) photoanode that largely improves the photoelectrochemical water oxidation performance. These novel WO3 photoanodes were prepared using a pulsed laser deposition method and their porosity was controlled by adjusting the oxygen partial pressure during the deposition process. The tree-like nanoporous WO3 photoanode has a nanoporous structure with a partially preferred alignment of the individual WO3 nanocrystals, which greatly improves the charge transport efficiency. Under simulated solar light illumination, the aforementioned features resulted in ∼9 times higher photocurrent density (1.8 mA cm<SUP>−2</SUP> at 1.23 V <I>vs.</I> RHE) than a dense WO3 photoanode. An incident photon-to-current conversion efficiency of over 70% was also obtained at wavelengths of 350–400 nm.</P></▼2>
Noh, Jun Hong,Cho, In-Sun,Lee, Sangwook,Cho, Chin Moo,Han, Hyun Soo,An, Jae-Sul,Kwak, Chae Hyun,Kim, Jin Yong,Jung, Hyun Suk,Lee, Jung-Kun,Hong, Kug Sun WILEY-VCH Verlag 2009 Physica status solidi. PSS. A, Applications and ma Vol.206 No.9
<P>Epitaxial ZnO and Al-doped ZnO (AZO) thin films were grown on (0001)-sapphire substrates using pulsed laser deposition. The photoluminescence spectrum of the highly conductive (1.3 × 10<SUP>3</SUP> S cm<SUP>−1</SUP>), as-grown AZO shows a poor near band edge (NBE) emission (3.30 eV) and no deep level emission at room temperature. In addition, the peak (3.386 eV) for the free excitons of AZO showed thermal quenching behavior with two activation energies (38.2 and 10.0 meV). The poor NBE emission is attributed to the nonradiative recombination center created by Al doping. Highly conductive (6.0 × 10<SUP>2</SUP> S cm<SUP>−1</SUP>) and intense NBE emitting AZO films could be achieved by the reduction of the nonradiative recombination centers through hydrogen annealing.</P>
SrNb<sub>2</sub>O<sub>6</sub> nanotubes with enhanced photocatalytic activity
Cho, In-Sun,Lee, Sangwook,Noh, Jun Hong,Kim, Dong Wook,Lee, Duk Kyu,Jung, Hyun Suk,Kim, Dong-Wan,Hong, Kug Sun Royal Society of Chemistry 2010 Journal of materials chemistry Vol.20 No.19
<P>SrNb<SUB>2</SUB>O<SUB>6</SUB> having a rhombic nanotubular structure with a diameter of 300 nm, average length of 3 μm and wall thickness of 50 nm was synthesized <I>via</I> a facile hydrothermal route. The prepared powders were characterized using X-ray diffraction, field-emission electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM) and Raman spectroscopy. Compared to the same material prepared by the solid-state reaction method, the rhombic nanotubes of SrNb<SUB>2</SUB>O<SUB>6</SUB> exhibited enhanced photocatalytic activity for the production of H<SUB>2</SUB> from pure water, which was mainly attributed to their higher surface area. Moreover, the increased optical absorption properties resulting from the variation of the crystal structure also contributed to their higher photocatalytic activity.</P> <P>Graphic Abstract</P><P>SrNb<SUB>2</SUB>O<SUB>6</SUB> powder with a nanotubular structure was synthesized <I>via</I> a facile hydrothermal route. This nanotube exhibited enhanced photocatalytic activity for the production of H<SUB>2</SUB> from water splitting compared with the bulk powder. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b926694a'> </P>
Choi, Yun-Hyuk,Kim, Dai-Hong,Han, Hyun Soo,Shin, Sun,Hong, Seong-Hyeon,Hong, Kug Sun American Chemical Society 2014 Langmuir Vol.30 No.3
<P>The direct printing synthesis of metal oxide hollow spheres in the form of film on a substrate is reported for the first time. This method offers facile, scalable, high-throughput production and device fabrication processes. The printing was carried out via a doctor-blade method using Cu(II) complex ink with controllable high viscosity based on formate–amine coupling. Following only thermal heating in air, well-defined polycrystalline copper oxide hollow spheres with a submicrometer diameter (≤1 μm) were formed spontaneously while being assembled in the form of a film with good adhesion on the substrate. This spontaneous hollowing mechanism was found to result from the Kirkendall effect during oxidation at elevated temperature. The CuO films with hollow spheres, prepared via direct printing synthesis at 500 °C, led to the creation of a superior p-type gas sensor and photocathode for photoelectrochemical water splitting with completely hollow cores, a rough/porous shell structure, a single phase, high crystallinity, and no organic/polymer residue. As a result, the CuO hollow-sphere films showed high gas responses and permissible response speeds to reducing gases and high photocurrent density compared to conventional CuO powder films and the values previously reported. These results exemplify the successful realization of a high-throughput printing fabrication method for the creation of superior nanostructured devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2014/langd5.2014.30.issue-3/la404098s/production/images/medium/la-2013-04098s_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la404098s'>ACS Electronic Supporting Info</A></P>
Kim, Dong Hoe,Han, Hyun Soo,Cho, In Sun,Seong, Won Mo,Park, Ik Jae,Park, Jong Hoon,Shin, Sun,Park, Gyeong Do,Park, Sangbaek,Lee, Sangwook,Hong, Kug Sun Elsevier 2015 International journal of hydrogen energy Vol.40 No.1
<P><B>Abstract</B></P> <P>We report photoelectrochemical (PEC) properties of single crystalline anatase TiO<SUB>2</SUB> nanowire (NW) arrays which are sensitized with CdS for visible light activity. Photocurrent varies largely with increasing the growth time (from 2 to 24 h) of the TiO<SUB>2</SUB> NWs and also increasing the deposition cycles (from 7 to 13 cycles) of CdS, which are attributed to changes in morphology of the TiO<SUB>2</SUB> NWs and CdS layer. TiO<SUB>2</SUB> NW array grown for 3 h with 9-cycles of CdS deposition exhibits the maximum photocurrent of 3.6 mA/cm<SUP>2</SUP> at 1.23 V vs. reversible hydrogen electrode (RHE) under the 1 SUN solar light. Morphological analysis combined with photoresponse analysis show that the 3 h-grown TiO<SUB>2</SUB> NW array has the most suitable structure for PEC electrode because of large surface area for light absorption and chemical reaction, and that the 9-cycles deposited CdS layer provides the optimum light absorption and electron lifetime.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The PEC properties of 1-D anatase TiO<SUB>2</SUB> NW/CdS electrodes are reported firstly. </LI> <LI> The effects of NW morphology and CdS cycles on properties of PEC were investigated. </LI> <LI> The 3 h growth NW shows vertically well-alignments and no canopy phase. </LI> <LI> The 9 CdS cycles has optimum condition for the charge generation and recombination. </LI> <LI> The 3 h growth NW with 9 CdS SILAR cycles shows the best performance. </LI> </UL> </P>
Noh, Jun Hong,Han, Hyun Soo,Lee, Sangwook,Kim, Dong Hoe,Park, Jong Hun,Park, Sangbaek,Kim, Jin Young,Jung, Hyun Suk,Hong, Kug Sun American Chemical Society 2010 The Journal of Physical Chemistry Part C Vol.114 No.32
<P>We present dye-sensitized solar cells (DSSCs) employing a thermally and chemically stable Nb-doped TiO<SUB>2</SUB> (NTO)/Al-doped ZnO (AZO) multilayer transparent conducting oxide (TCO) thin film. The NTO overlayer was found to block oxygen diffusion into AZO during the air-annealing process for the fabrication process of the DSSCs, thereby exhibiting good thermal stability in electrical conductivity of the multilayer TCO. Moreover, the NTO overlayer suppressed the formation of Zn<SUP>2+</SUP>-dye aggregates at the surface of the AZO. The DSSC employing this multilayer TCO showed a photon to electron conversion efficiency of 3.8% compared to 1.9% for the cell employing the AZO single layer. The optical transmittance and charge transport properties that were measured using electrochemical impedance spectroscopy demonstrate that NTO/AZO is a promising TCO for large scale DSSCs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2010/jpccck.2010.114.issue-32/jp104247t/production/images/medium/jp-2010-04247t_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp104247t'>ACS Electronic Supporting Info</A></P>