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Jo, Yimhyun,Cheon, Jae Yeong,Yu, Jeonghun,Jeong, Hu Young,Han, Chi-Hwan,Jun, Yongseok,Joo, Sang Hoon The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.65
<P>We report the preparation of highly interconnected ordered mesoporous carbon–carbon nanotube nanocomposites which show Pt-like dye-sensitized solar cell (DSSC) efficiency and remarkable long-term durability as DSSC counter electrodes.</P> <P>Graphic Abstract</P><P>Nanocomposites of OMC and CNTs are prepared for Pt-free, highly efficient counter electrodes of DSSCs. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc30923h'> </P>
Kim, Jin Hyun,Jo, Yimhyun,Kim, Ju Hun,Jang, Ji Wook,Kang, Hyun Jun,Lee, Young Hye,Kim, Dong Suk,Jun, Yongseok,Lee, Jae Sung American Chemical Society 2015 ACS NANO Vol.9 No.12
<P>A stand-alone, wireless solar water splitting device without external energy supply has been realized by combining in tandem a CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> perovskite single junction solar cell with a cobalt carbonate (Co-Ci)-catalyzed, extrinsic/intrinsic dual-doped BiVO<SUB>4</SUB> (hydrogen-treated and 3 at% Mo-doped). The photoanode recorded one of the highest photoelectrochemical water oxidation activity (4.8 mA/cm<SUP>2</SUP> at 1.23 V<SUB>RHE</SUB>) under simulated 1 sun illumination. The oxygen evolution Co-Ci co-catalyst showed similar performance to best known cobalt phosphate (Co-Pi) (5.0 mA/cm<SUP>2</SUP> at 1.23 V<SUB>RHE</SUB>) on the same dual-doped BiVO<SUB>4</SUB> photoanode, but with significantly better stability. A tandem artificial-leaf-type device produced stoichiometric hydrogen and oxygen with an average solar-to-hydrogen efficiency of 4.3% (wired), 3.0% (wireless) under simulated 1 sun illumination. Hence, our device based on a D4 tandem photoelectrochemical cell represents a meaningful advancement in performance and cost over the device based on a triple-junction solar cell-electrocatalyst combination.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-12/acsnano.5b03859/production/images/medium/nn-2015-03859j_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b03859'>ACS Electronic Supporting Info</A></P>
Saji, Viswanathan S,Jo, Yimhyun,Moon, Hoi Ri,Jun, Yongseok,Song, Hyun-Kon Springer 2011 Nanoscale research letters Vol.6 No.1
<P>There are many practical difficulties in direct adsorption of polymers onto nanocrystalline inorganic oxide surface such as Al<SUB>2</SUB>O<SUB>3 </SUB>and TiO<SUB>2 </SUB>mainly due to the insolubility of polymers in solvents or polymer agglomeration during adsorption process. As an alternative approach to the direct polymer adsorption, we propose surface-bound polymerization of pre-adsorbed monomers. 6-(3-Thienyl)hexanoic acid (THA) was used as a monomer for poly[3-(5-carboxypentyl)thiophene-2,5-diyl] (PTHA). PTHA-coated nanocrystalline TiO<SUB>2</SUB>/FTO glass electrodes were prepared by immersing THA-adsorbed electrodes in FeCl<SUB>3 </SUB>oxidant solution. Characterization by ultraviolet/visible/infrared spectroscopy and thermal analysis showed that the monolayer of regiorandom-structured PTHA was successfully formed from intermolecular bonding between neighbored THA surface-bound to TiO<SUB>2</SUB>. The anchoring functional groups (-COOH) of the surface-crawling PTHA were completely utilized for strong bonding to the surface of TiO<SUB>2</SUB>.</P>
박명관(MyoungKwan Park),장운정(Woonjung Jang),조임현(Yimhyun Cho),김기윤(Ki-Yoon Kim),이주환(Ju-Hwan Lee) 한국HCI학회 2017 한국HCI학회 학술대회 Vol.2017 No.2
폭발적으로 성장하고 있는 가상현실(VR)관련 기술산업이 성공적으로 안착하여 대중화되기 위해서는 사용자의 필요와 욕구를 충족시키는 다양한 콘텐츠 서비스를 확보해야 한다. 본 연구에서는 기존의 슈팅게임 등 엔터인먼트 분야에 치중되어있는 가상현실 콘텐츠의 흐름에서 벗어나, 가상공간의 공유와 소셜 인터랙션 측면에 집중하여 새로운 콘텐츠 서비스이자 하나의 비즈니스 모델로서의 가상현실(VR) 데이트 플랫폼인 ‘리얼데이트’ 서비스를 제안하고, 그 구체적인 세부구성과 사용 시나리오를 소개하고자 한다. 이를 통해 가상현실이 갖는 본질적 가치인 가상적 공간에 대한 현실감, 공유공간으로의 공존감 등의 효과를 시공간의 제약으로 제한된 사회적 상호작용의 가능성, 특히 감정 교류를 통해 인터랙션하는 소셜 네트워크 데이팅의 가능성을 탐색해본다.
High-Temperature–Short-Time Annealing Process for High-Performance Large-Area Perovskite Solar Cells
Kim, Minjin,Kim, Gi-Hwan,Oh, Kyoung Suk,Jo, Yimhyun,Yoon, Hyun,Kim, Ka-Hyun,Lee, Heon,Kim, Jin Young,Kim, Dong Suk American Chemical Society 2017 ACS NANO Vol.11 No.6
<P>Organic inorganic hybrid metal halide perovskite solar cells (PSCs) are attracting tremendous research interest due to their high solar-to-electric power conversion efficiency with a high possibility of cost-effective fabrication and certified power conversion efficiency now exceeding 22%. Although many effective methods for their application have been developed over the past decade, their practical transition to large-size devices has been restricted by difficulties in achieving high performance. Here we report on the development of a simple and cost-effective production method with high-temperature and short-time annealing processing to obtain uniform, smooth, and large size grain domains of perovskite films over large areas. With high-temperature short-time annealing at 400 degrees C for 4 s, the perovskite film with an average domain size of 1 pm was obtained, which resulted in fast solvent evaporation. Solar cells fabricated using this processing technique had a maximum power conversion efficiency exceeding 20% over a 0.1 cm(2) active area and 18% over a 1 cm(2) active area. We believe our approach will enable the realization of highly efficient large-area PCSs for practical development with a very simple and short-time procedure. This simple method should lead the field toward the fabrication of uniform large-scale perovskite films, which are necessary for the production of high-efficiency solar cells that may also be applicable to several other material systems for more widespread practical deployment.</P>