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Shi, Xinjian,Cai, Lili,Choi, Il Yong,Ma, Ming,Zhang, Kan,Zhao, Jiheng,Kim, Jung Kyu,Kim, Jong Kyu,Zheng, Xiaolin,Park, Jong Hyeok The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.40
<P>Charge carrier dynamics and light harvesting ability are most important for the performance of a photoanode in photoelectrochemical (PEC) systems. In this work, through a facile flame surface treatment process in a reducing atmosphere, oriented WO3 nanoneedles are grown on pre-formed vertically aligned nanohelices. Nanohelices have excellent light harvesting abilities on their own; however, the addition of nanoneedles to the top of nanohelices increases the light harvesting abilities even further. More importantly, the reducing atmosphere for the post-treatment process enhances the metallic properties of WO3, changes the band position to facilitate hole transport, and modifies the flat band potential, all of which contribute to an improved performance in terms of photocurrent density and onset. The as-fabricated WO3 nanohelices/nanoneedles with a metallic interface have also been used for heterojunction photoanode fabrication for water oxidation through two- and four-electron pathways for H2O2 and O2 production, respectively.</P>
Shi, Xinjian,Zhang, Kan,Shin, Kahee,Moon, Jun Hyuk,Lee, Tae-Woo,Park, Jong Hyeok The Royal Society of Chemistry 2013 Physical chemistry chemical physics Vol.15 No.28
<P>In this study, we constructed an inverse opal structured hematite (IOS α-Fe<SUB>2</SUB>O<SUB>3</SUB>) as the photoanode of a photoelectrochemical (PEC) cell for efficient solar water splitting <I>via</I> a simple electrochemical process. At the same time, a series of affecting factors (template particle size, electrodeposition time and annealing temperature) to construct the IOS α-Fe<SUB>2</SUB>O<SUB>3</SUB> photoanode on the photoelectrochemical water splitting were considered. Optimized PEC efficiency was observed for the IOS α-Fe<SUB>2</SUB>O<SUB>3</SUB> photoanode annealed at 400 °C using the 250 nm sized-polystyrene (PS) colloid template and 9 minutes of electrodeposition time for the given specific Fe precursor solution. This resulted in the highest photocurrent density compared to other crossed conditions, which significantly achieved 3.1 mA cm<SUP>−2</SUP> at 0.5 V <I>vs.</I> Ag/AgCl reference electrode. The synthesis of the IOS α-Fe<SUB>2</SUB>O<SUB>3</SUB><I>via</I> an easy-to-control electrochemical process is described for first time that opens a possibility for constructing other oxide semiconductor photoanodes (not only well-known Si, Ti and Zr) with inverse opal structure.</P> <P>Graphic Abstract</P><P>A novel three-dimensional inverse opal structured α-Fe<SUB>2</SUB>O<SUB>3</SUB> was fabricated by a steady electrodeposition method with controlling of different variables. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cp50459j'> </P>
Photoelectrochemical cells with tungsten trioxide/Mo-doped BiVO<sub>4</sub> bilayers
Zhang, Kan,Shi, Xin-Jian,Kim, Jung Kyu,Park, Jong Hyeok The Royal Society of Chemistry 2012 Physical chemistry chemical physics Vol.14 No.31
<P>Mo-doped BiVO<SUB>4</SUB> nanocrystals with low bandgap energy were embedded into the surface of WO<SUB>3</SUB> film, resulting in WO<SUB>3</SUB>/BiV<SUB>0.95</SUB>Mo<SUB>0.05</SUB>O<SUB>4</SUB> photoanodes, which were tested in photoelectrochemical cells for water splitting. Bilayer photoelectrochemical cells showed enhanced photocurrent density: three times that shown by a cell with a pure WO<SUB>3</SUB> photoanode and 1.5 times that of a cell with a WO<SUB>3</SUB>/BiVO<SUB>4</SUB> bilayer photoanode. BiVO<SUB>4</SUB> showed poor charge carrier mobility; the performance of photoelectrochemical cells can be improved only when BiVO<SUB>4</SUB> is combined with a WO<SUB>3</SUB> bottom layer, even after Mo doping and tailoring its transition energies by atomic doping.</P> <P>Graphic Abstract</P><P>High photocurrent density was achieved by WO<SUB>3</SUB>/Mo-doped BiVO<SUB>4</SUB> (BiV<SUB>0.95</SUB>Mo<SUB>0.05</SUB>O<SUB>4</SUB>) bilayers in which the Mo atoms increased charge generation, resulting in improved photocurrent density. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp40991g'> </P>
Jianquan Kan,Hui Shi,Xiong Liu,Zongdao Chen 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.6
Effects of sweet potato proteoglycans (SPG) inrats fed high lipid diets were investigated. Serum lipidindices for SPG were evaluated. SPG had hypolipidemiceffects that were correlated with dosage. There were nosignificant (p>0.05) differences in hypolipidemic effectsbetween SPG varieties of different molecular weights. SPG-1 (Mw value: 508.3 kDa) significantly (p<0.05)reduced serum total cholesterol (TC), triacylglyceride(TAG), low density lipoprotein cholesterol (LDL-C), andapolipoprotein (Apo) B levels, and the arteriosclerosisindex (AI), and induced serum high density lipoproteincholesterol (HDL-C), ApoA-I, lecithin cholesterol acyltransferase(LCAT), and liver lipoprotein lipase (LPL)activities, compared with controls. The whole blood viscosityand red blood cell (RBC) membrane microviscosity werealso decreased. Hypolipidemic effects were mediated viaelevation of the serum HDL-C concentration by inductionof LACT activity, an increased ApoA-I concentration, anda reduction in the serum lipid concentration due toregulation of LPL activity.
Inverse opal structured α-Fe2O3 on graphene thin films: enhanced photo-assisted water splitting.
Zhang, Kan,Shi, XinJian,Kim, Jung Kyu,Lee, Jae Sung,Park, Jong Hyeok RSC Pub 2013 Nanoscale Vol.5 No.5
<P>A graphene interlayer was successfully inserted into inverse opaline hematite (α-Fe(2)O(3)) photoanodes for solar water splitting using the template assisted electrodeposition method. Finding the optimal thermal annealing temperature is crucial for the successful attainment of the inverse opaline hematite nanostructure on a graphene thin film. This is because an appropriate temperature is required to convert pre-deposited Fe(0) into hematite with optimum crystalline structure and to simultaneously remove the soft polystyrene template without thermal degradation of the graphene film on a transparent conductive substrate. Different from the conventional strategies based on graphene-semiconductor systems, this novel mechanism has been proposed whereby the graphene interlayer can act as both an electron transfer layer and an electrolyte blocking barrier, by which it not only reduces the charge recombination at the substrate-electrolyte interface but also helps electron transportation from α-Fe(2)O(3) to the substrate of the photoanode. Therefore, both photocurrent density and incident photon-to-current efficiency (IPCE) have been remarkably improved, which are several times higher than those of the pure inverse opaline hematite photoanode.</P>
Zhang, Kan,Kim, Hwan-Jin,Lee, Jeong-Taik,Chang, Gee-Woo,Shi, Xinjian,Kim, Wanjung,Ma, Ming,Kong, Ki-jeong,Choi, Jae-Man,Song, Min-Sang,Park, Jong Hyeok Wiley-VCH 2014 ChemSusChem Vol.7 No.9
<P>A 2H-MoS2 (H=hexagonal) ultrathin nanomesh with high defect generation and large porosity is demonstrated to improving electrochemical performance, including in lithium-ion batteries (LIBs) and the hydrogen evolution reaction (HER), with the aid of a 3D reduced graphene oxide (RGO) scaffold as fast electron and ion channels. The 3D defect-rich MoS2 nanomesh/RGO foam (Dr-MoS2 Nm/RGO) can be easily obtained through a one-pot cobalt acetate/graphene oxide (GO) co-assisted hydrothermal reaction, in which GO, cobalt and acetate ions are co-morphology-controlling agents and defect inducers. As an anode material for LIBs, Dr-MoS2 Nm/RGO has only a 9% capacity decay at a 10?C discharge rate versus 0.2?C with stable cyclability at the optimized composition (5?wt% RGO to MoS2 and 2?mol% Co to Mo), and significantly achieves 810?mA?h?g(-1) at a high current density of 9.46?A?g(-1) over at least 150?cycles. Moreover, Dr-MoS2 Nm/RGO exhibits superior activity for the HER with an overpotential as low as 80?mV and a Tafel slope of about 36?mV per decade. In contrast to the MoS2 nanosheet/RGO (MoS2 Ns/RGO), which is synthesized in the absence of cobalt ions, Dr-MoS2 Nm/RGO provides high interconnectivity for efficient lithium-ion transport, and rich defects as electrochemically active sites. DFT is used to prove the existence of rich defects due to anion replacement to become a Co-Mo-S atomic structure, releasing inert basal planes to active sites.</P>
Zhang, Kan,Heo, Nansra,Shi, Xinjian,Park, Jong Hyeok American Chemical Society 2013 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.117 No.45
<P>We report a simple and versatile strategy for hybridizing 1-D silver trimolybdate wires (Ag<SUB>2</SUB>Mo<SUB>3</SUB>O<SUB>10</SUB> Ws) and graphene oxide (GO) by a direct solution process. Because of the photoactive nature of Ag<SUB>2</SUB>Mo<SUB>3</SUB>O<SUB>10</SUB> Ws, Ag particles were uniformly formed on their surfaces with the assistance of solar light. Enriched surface functional groups of GO from chemical activation induce a chemical coordination with these Ag particles. As a result, a uniform ternary hybrid mixture was successfully formed with metallic Ag nanoparticles as a bridge connecting activated GO and Ag<SUB>2</SUB>Mo<SUB>3</SUB>O<SUB>10</SUB> Ws. We found that both excited GO and Ag<SUB>2</SUB>Mo<SUB>3</SUB>O<SUB>10</SUB> could generate electron/hole pairs separated in space by metallic Ag as a solid-state electron mediator. The novel photocatalytic mechanism was confirmed using photocurrents, the electronic-band structure, and photoactivity correlation analysis.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2013/jpccck.2013.117.issue-45/jp407038c/production/images/medium/jp-2013-07038c_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp407038c'>ACS Electronic Supporting Info</A></P>
Manufacture and Performance of Textile-ramie Fiber Reinforced Anionic Polyamide 6 Composites
Hao Shi,Lijian Xia,Zonglei Guo,Abin Sun,Hui Wang,Ze Kan 한국섬유공학회 2019 Fibers and polymers Vol.20 No.8
A vacuum assistant resin infusion moulding (VARIM) was adopted to prepare a new-style and environmentalfriendly thermoplastic composite consisting of anionic polyamide-6 (APA-6) and textile-ramie fiber. However, the intensivepolymerization-inhibition and fiber-discoloration phenomena were found in the reactive processing. In order to overcomethese problems, two methods were used to suppress the reaction between the ramie fiber and APA-6, which are the surfacemodification of ramie fiber and a new initiator with a low activity. Finally, the inhibition and discoloration phenomena weresuppressed significantly, which overcame the major challenge during the preparation of ramie fiber reinforced APA-6composites by reactive processing. The composites showed a good polymerization during VARIM process. The tensilestrength and flexural modulus of the obtained composites were increased by 21 % and 26 % respectively compared with thatof pure APA-6. It is important to find that there were some interactions between APA-6 and ramie fiber, which produced agood interface characters. This work not only opens new avenues for the development of renewable composites, but alsofurther broadens the applications of the natural fibers.