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Jeon, Tae Hwa,Choi, Wonyong,Park, Hyunwoong American Chemical Society 2011 The Journal of Physical Chemistry Part C Vol.115 No.14
<P>Nanocrystalline hematite particles (α-Fe<SUB>2</SUB>O<SUB>3</SUB>) were electrodeposited on the TiO<SUB>2</SUB> nanotube (TiNT) arrays that were fabricated via anodization of Ti foils. The short precontact time (1 h) of aqueous ferric ions (Fe<SUP>3+</SUP>) on TiNT resulted in formation of hematite particles selectively on the mouth surface of TiNT (hematite@1 h/TiNT), whereas the long precontact time (24 h) resulted in complete filling of the TiNT inside and an even full-covering of the TiNT top surface with the hematite particles (hematite@24 h/TiNT). For comparison, hematite particles were also electrodeposited on TiO<SUB>2</SUB>-nanoparticulate films obtained via oxidative annealing of Ti foil resulting in hematite fully covered TiO<SUB>2</SUB> nanoparticles (hematite/TiNP). Photoelectrochemical (PEC) study with AM 1.5 light (UV + Vis) indicated that the PEC activity of TiNT decreased by ca. 40% and almost completely vanished when hematite covered the full surface of TiNT (hematite@ 24 h/TiNT) and loaded on the mouth surface of TiNT (hematite@1 h/TiNT), respectively. The relatively higher PEC activity of hematite@24 h/TiNT was further observed under varying visible light conditions (400 nm < λ < 500 nm). Hematite/TiNP also has ca. 40%-reduced PEC activity as compared to TiNP under AM 1.5 light, the tendency of which is similar to hematite@24 h/TiNT. Photocatalytic (PC) activities of TiNT and hematite/TiNT for degradation of aqueous phenol under AM 1.5-light were also compared, which indicates that the PC activity of TiNT vanishes almost completely with hematite@1 h/TiNT, whereas it is recovered at a moderate level with hematite@24 h/TiNT. All of these PEC and PC behaviors of TiNT and hematite/TiNT were discussed in terms of hematite-induced charge recombination due to an energy level mismatch between TiO<SUB>2</SUB> and hematite, as well as surface-specific photoactivity of TiNT (i.e., mouth surface vs interwall and/or underlying base layer). Various surface analysis techniques (XRD, XPS, TEM, UV−vis diffuse reflectance) were employed to understand the surface states of TiNT and hematite/TiNT. Finally, more detailed charge transfer mechanism was proposed.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2011/jpccck.2011.115.issue-14/jp201215t/production/images/medium/jp-2011-01215t_0002.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp201215t'>ACS Electronic Supporting Info</A></P>
Jeon, Tae Hwa,Moon, Gun-hee,Park, Hyunwoong,Choi, Wonyong unknown 2017 Nano energy Vol.39 No.-
<P><B>Abstract</B></P> <P>Ultrahigh-efficiency photoelectrochemical water oxidation using modified hematite (α-Fe<SUB>2</SUB>O<SUB>3</SUB>) nanorod arrays is reported. The hematite nanorod arrays are synthesized using chemical bath deposition and further modified by hydrogen treatment, loading of a ~ 3.5-nm-thick TiO<SUB>2</SUB> overlayer, and deposition of a cobalt phosphate (CoPi) catalyst. Although each modification method is well known, an elaborate optimization of the combined modification methods achieves a stable photocurrent density of ~ 6mAcm<SUP>−2</SUP> at 1.23V vs. RHE over 100h under AM 1.5G irradiation (100mWcm<SUP>−2</SUP>) with the stoichiometric O<SUB>2</SUB> and H<SUB>2</SUB> evolutions at ~ 95% of Faradaic efficiency. To the best of our knowledge, this is the highest photocurrent density obtained using a hematite-based photoanode, and such long-term durability coupled with this level of efficiency has been rarely reported. The modified-hematite photoanodes are thoroughly characterized using various spectroscopic and electrochemical techniques. While the hydrogen treatment enhances the electrical conductivity, the ultrathin TiO<SUB>2</SUB> overlayer reduces the surface charge recombination and effectively preserved the integrity of the hydrogen-treated hematite electrode.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hematite nanorod arrays doped with hydrogen and coated with an ultrathin TiO<SUB>2</SUB> layer are synthesized. </LI> <LI> An optimized hematite exhibits unprecedented photocurrents of ~ 6mAcm<SUP>−2</SUP> at 1.23V over 100h. </LI> <LI> O<SUB>2</SUB> is linearly produced from water with a current efficiency of 100% without deactivation for 100h. </LI> <LI> A stoichiometric amount of H<SUB>2</SUB> was simultaneously produced. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Hepatotoxic Effects of 1-Furan-2-yl-3-pyridin-2-yl-propenone, a New Anti-Inflammatory Agent, in Mice
( Tae Won Jeon ),( Chun Hwa Kim ),( Sang Kyu Lee ),( Sil Shin ),( Jae Ho Choi ),( Won Ku Kang ),( Sang Kyun Kim ),( Mi Jeong Kang ),( Eung Seok Lee ),( Tae Cheon Jeong ) 한국응용약물학회 2009 Biomolecules & Therapeutics(구 응용약물학회지) Vol.17 No.3
Immunotoxicological Investigation of 1-furan-2-yl-3-pyridin-2-yl-propenone in Female BALB/c Mice
( Tae Won Jeon ),( Chun Hwa Kim ),( Sang Kyu Lee ),( Gyu Sub Ko ),( Jin Woo Yoo ),( Hyun Woo Ha ),( Won Ku Kang ),( Hye Gwang Jeong ),( Mi Jeong Kang ),( Eung Seok Lee ),( Tae Cheon Jeong ) 한국응용약물학회 2009 Biomolecules & Therapeutics(구 응용약물학회지) Vol.17 No.4
Photoelectrochemical Water Oxidation Using ZnO Nanorods Coupled with Cobalt-Based Catalysts
Jeon, Tae-Hwa,Choi, Sung-Kyu,Jeong, Hye-Won,Kim, Seung-Do,Park, Hyun-Woong The Korean Electrochemical Society 2011 Journal of electrochemical science and technology Vol.2 No.4
Photoelectrochemical performances of ZnO electrodes are enhanced by coupling with cobalt-based catalyst (CoPi) in phosphate electrolyte (pH 7). For this study, hexagonal pillar-shaped ZnO nanorods are grown on ZnO electrodes through a chemical bath deposition, onto which CoPi is deposited with different photodeposition times (10-30 min). A scanning electron microscopic study indicates that CoPi deposition does not induce any change of ZnO morphology and an energy-dispersive X-ray spectroscopic analysis shows that inorganic phosphate ions (Pi) exist on ZnO surface. Bare ZnO electrodes generate the current of ca. $0.36mA/cm^2$ at a bias potential of 0.5 V vs. SCE, whereas ZnO/CoPi (deposited for 10 min) has ca. 50%-enhanced current ($0.54mW/cm^2$) under irradiation of AM 1.5G-light ($400mW/cm^2$). The excess loading of CoPi on ZnO results in decrease of photocurrents as compared to bare ZnO likely due to limited electrolyte access to ZnO and/or CoPi-mediated recombination of photogenerated charge carriers. The primary role of CoPi is speculated to trap the photogenerated holes and thereby oxidize water into molecular oxygen via an intervalency cycle among Co(II), Co(III), and Co(IV).
Jeon, Tae Hwa,Bokare, Alok D.,Han, Dong Suk,Abdel-Wahab, Ahmed,Park, Hyunwoong,Choi, Wonyong Elsevier 2017 Applied catalysis. B, Environmental Vol.201 No.-
<P><B>Abstract</B></P> <P>Porous hematite (α-Fe<SUB>2</SUB>O<SUB>3</SUB>) films doped with Sn(IV) and coated with an ultrathin (∼2nm thick) Nb<SUB>2</SUB>O<SUB>5</SUB> passivation layer were synthesized, and the photoelectrochemical (PEC) water oxidation performance and durability of the hematite were examined in detail. As compared to hematite samples modified by either doping or passivation, dual-modified hematite exhibited a promising PEC water oxidation performance under AM 1.5 irradiation. A stable photocurrent was maintained under prolonged irradiation over 24h, while O<SUB>2</SUB> was produced from water with a Faradaic efficiency of over 80% without showing any sign of deactivation. This performance and durability could be decoupled into separate effects of Sn doping and Nb<SUB>2</SUB>O<SUB>5</SUB> layer via in-depth surface characterization and electrochemical analyses. Sn doping increased the donor density (<I>N</I> <SUB>d</SUB>) of bare hematite by a factor of 20 and significantly improved its conductivity, leading to enhanced charge transfer efficiency. The Nb<SUB>2</SUB>O<SUB>5</SUB> layer exerted an effect similar to Sn doping because of the diffusion of a fraction of Nb(V) into the hematite lattice during the annealing process at 700°C. The primary effect of the Nb<SUB>2</SUB>O<SUB>5</SUB> layer is to passivate the hematite surface and make the surface more reactive toward the oxygen evolution through water oxidation. These effects are synergistically combined in the dual-modified hematite electrode.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hematite doped with Sn(IV) and coated with an ultrathin Nb<SUB>2</SUB>O<SUB>5</SUB> layer are synthesized. </LI> <LI> Dual-modified hematite exhibits remarkably high photoelectrochemical efficiencies. </LI> <LI> A stable photocurrent is maintained under prolonged irradiation over 24h. </LI> <LI> O<SUB>2</SUB> is linearly produced from water with an efficiency of >80% without deactivation. </LI> <LI> The effect is in-depth studied in terms of charge separation and injection. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
연구논문 : 생명과학 ; 마우스 및 랫드에서 botulinum toxin type A의 단회 및 28일 반복투여 독성시험
전태원 ( Tae Won Jeon ),김지영 ( Ji Young Kim ),현선희 ( Sun Hee Hyun ),김남희 ( Nam Hee Kim ),이상규 ( Sang Kyu Lee ),김춘화 ( Chun Hwa Kim ),우희동 ( Hee Dong Woo ),양기혁 ( Gi Hyeok Yang ),정현호 ( Hyun Ho Jung ),정태천 ( Tae C 영남대학교 약품개발연구소 2004 영남대학교 약품개발연구소 연구업적집 Vol.14 No.-
JUNG, CHANG HWA,AHN, JIYUN,JEON, TAE-IL,KIM, TAE WAN,HA, TAE YOUL D.A. Spandidos 2012 Experimental and therapeutic medicine Vol.4 No.3
<P>Numerous medicinal plants and their derivatives have been reported to prevent obesity and related diseases. Although <I>Syzygium aromaticum</I> has traditionally been used as an anodyne, carminative and anthelmintic in Asian countries, its potential in the prevention and treatment of obesity has not yet been explored. Therefore, the present study investigated the anti-obesity effect of <I>S. aromaticum</I> ethanol extract (SAE) both <I>in vitro</I> and <I>in vivo</I>. To evaluate the anti-obesity potential of SAE <I>in vitro</I>, the effect of SAE treatment on adipocyte differentiation in 3T3-L1 cells was investigated. To evaluate its potential <I>in vivo</I>, mice were assigned to three groups: a group fed the American Institute of Nutrition AIN-76A diet (normal group), an experimental group fed a high-fat diet (HFD group) and an experimental group fed an HFD supplemented with 0.5% (w/w) SAE (HFD + SAE group). After 9 weeks of feeding, the body weight; white adipose tissue (WAT) mass; serum triglyceride (TG), total cholesterol (TC), high-density lipoprotein (HDL) cholesterol, glucose, insulin and leptin; hepatic lipid accumulation; and levels of lipid metabolism-related genes in the liver and WAT were measured. <I>In vitro</I> investigation of the effect of SAE treatment on 3T3-L1 cells revealed that it had efficiently inhibited the conversion of cells into adipocytes in a dose-dependent manner. <I>In vivo</I> investigation revealed that SAE supplementation had significantly decreased HFD-induced increases in the body weight, liver weight, WAT mass, and serum TG, TC, lipid, glucose, insulin and leptin levels. Consistent with its effects on liver weight and WAT mass, SAE supplementation was found to have suppressed the expression of lipid metabolism-related proteins, including SREBP-1, FAS, CD36 and PPARγ in the liver and WAT, in addition to downregulating mRNA levels of transcription factors including Srebp and Pparg. SAE inhibits fat accumulation in HFD-fed mice via the suppression of transcription factors integral to adipogenesis and lipogenesis, suggesting its potential in preventing obesity.</P>
Jihoon Oh(Jihoon Oh),Sekye Jeon(Sekye Jeon),Tae Hyon Ha(Tae Hyon Ha),Woojae Myung(Woojae Myung),Seung-Hwan Lee(Seung-Hwan Lee),Young-Hoon Ko(Young-Hoon Ko),Do Hoon Kim(Do Hoon Kim),Hwa-Young Lee(Hwa-Y 대한정신약물학회 2023 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.21 No.2
Objective: Although the effects and safety of transcranial direct current stimulation (tDCS) treatment in depressive patients are largely investigated, whether the self-administration of tDCS treatment at patient’s home is comparable to clinic-based treatment is still unknown. Methods: In this single-arm, multi-center clinical trial, 61 patients with mild to moderate major depressive disorder were enrolled. tDCS treatment was delivered at the patient’s home once a day, 5 to 7 times a week for 6 weeks, and each session lasted for 30 minutes. The primary outcome was a total Beck-Depression Inventory-II score, and no concurrent antidepressants were used. Results: The remission rates in both Full-Analysis (FA) (n = 61) and Per-Protocol (PP) (n = 43) groups were statistically significant (FA: 57.4% [0.44−0.70], PP: 62.8% [0.47−0.77]; percent [95% confidence interval]). The degree of depression- related symptoms was also significantly improved in 2, 4, and 6 weeks after the treatment when compared with baseline. There was no significant association between treatment compliance and remission rate in both FA and PP groups. Conclusion: These results suggest that acute treatment of patient-administered tDCS might be effective in improving the subjective feeling of depressive symptoms in mild to moderate major depressive disorder patients.