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( Jinyoung Chun ),( Jang H. Chun ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.6
This review article described the electrochemical Frumkin, Langmuir, and Temkin adsorption isotherms of over-potentially deposited hydrogen (OPD H) and deuterium (OPD D) for the cathodic H<sub>2</sub> and D<sub>2</sub> evolution reactions (HER, DER) at Pt, Ir, Pt-Ir alloy, Pd, Au, and Re/normal (H<sub>2</sub>O) and heavy water (D<sub>2</sub>O) solution interfaces. The Frum-kin, Langmuir, and Temkin adsorption isotherms of intermediates (OPD H, OPD D, etc.) for sequential reactions (HER, DER, etc.) at electrode/solution interfaces are determined using the phase-shift method and correlation constants, which have been suggested and developed by Chun et al. The basic procedure of the phase-shift method, the Frumkin, Lang-muir, and Temkin adsorption isotherms of OPD H and OPD D and related electrode kinetic and thermodynamic param-eters, i.e., the fractional surface coverage (0 ≤ θ ≤ 1) vs. potential (E) behavior (θ vs. E), equilibrium constant (K), interaction parameter (g), standard Gibbs energy (ΔG<sub>θ</sub>˚) of adsorption, and rate (r) of change of ΔG<sub>θ</sub>˚ with θ (0 ≤ θ ≤ 1), at the interfaces are briefly interpreted and summarized. The phase-shift method and correlation constants are useful and effective techniques to determine the Frumkin, Langmuir, and Temkin adsorption isotherms and related electrode kinetic and thermodynamic parameters (θ vs. E, K, g, ΔG<sub>θ</sub>˚, r) at electrode/solution interfaces.
Jinyoung Chun,Yang Mo Gu,Jongkook Hwang,Kyeong Keun Oh,Jin Hyung Lee 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Rice husk is a promising abundant bioresource for the production of high value-added silica materialsbecause it has the highest SiO2 content among all plant-based resources. In this study, orderedmesoporous silica with various pore structures are synthesized from rice husk by combining acidleaching, chemical dissolution, and co-assembly with additional surfactants. Depending upon the type ofthe surfactant used and the co-assembly conditions, various mesoporous silica that have controlled porestructures (mesocellular forms and hexagonal nanochannel structures), pore sizes (3–60 nm), largesurface areas (297–895 m2 g 1), and pore volumes (0.81–1.77 cm3 g 1) are successfully synthesized froma sodium silicate solution, which was made from high-purity silica (99.8%) extracted from rice husk. Thesynthesis of high value-added silica from an abundant bioresource can open up new avenues forsustainable and environment-friendly industrial development.
Chun, Jinyoung,Seo, Sang Woo,Jung, Gyoo Yeol,Lee, Jinwoo Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.18
<P>The simple and efficient separation of histidine-tagged (His-tagged) proteins using nickel ferrite (NiFe<SUB>2</SUB>O<SUB>4</SUB>) nanoparticle clusters (NPCs) is described in this article. While nanostructured materials containing Ni<SUP>2+</SUP> ions for efficient separation were generally synthesized <I>via</I> complex synthetic procedures, the NiFe<SUB>2</SUB>O<SUB>4</SUB> nanoparticle clusters used in this work were simply synthesized by a one-pot hydrothermal polyol process. Their large surface area (105.0 m<SUP>2</SUP> g<SUP>−1</SUP>) and pore volume (0.32 cm<SUP>3</SUP> g<SUP>−1</SUP>) provide sufficient sites for the separation of His-tagged proteins. The high magnetic saturation value (41.3 emu g<SUP>−1</SUP>) and superparamagnetic property of these nanoparticle clusters lead to a more efficient magnetically recyclable separation of His-tagged proteins. We confirmed that the binding capacity and selective separation ability seen in the first separation were strongly maintained for up to 7 cycles.</P> <P>Graphic Abstract</P><P>The simple and efficient purification of histidine-tagged (His-tagged) proteins using nickel ferrite (NiFe<SUB>2</SUB>O<SUB>4</SUB>) nanoparticle clusters is described. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0jm04089d'> </P>
Chun, Jinyoung,Lee, Jinwoo WILEY‐VCH Verlag 2010 European journal of inorganic chemistry Vol.2010 No.27
<P><B>Abstract</B></P><P>In this microreview, the recent progress on various synthetic methods for 1D semiconductor nanowires is summarized. The colloidal synthetic method has been popularly employed to prepare various semiconductor nanorods/nanowires such as ZnS and TiO<SUB>2</SUB>. The vapor–liquid–solid (VLS) synthetic method has been used to fabricate Si and ZnO nanowires. For the growth of semiconductor nanowires by the VLS method, metals that can form a eutectic mixture with a target material have been used as catalysts. After the first report on the synthesis of crystalline III–V semiconductor nanowires by the solution–liquid–solid (SLS) method, various kinds ofIII–V and II–VI semiconductor nanowires have been synthesized by the SLS method. Various types of templates, including anodic aluminum oxide (AAO), sacrificial nanowire templates, and self‐assembled surfactants, have been employed to fabricate 1D semiconductor nanowires that resemble the shape of the template employed. Using 1D semiconductor nanowires, high‐performance photovoltaic cells can be fabricated due to facile electron transport within nanowires.</P>
Chun, Jinyoung,An, Sunhyung,Lee, Jinwoo The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.43
<P>Recycling waste iron slag to produce a high value-added product is of crucial importance to the steel industry, in terms of waste management, as well as to other industries searching for more attractive raw materials. Herein, we report a novel and facile approach to synthesize highly mesoporous silicon derived from waste iron slag. Simple acid leaching of iron slag leads to the generation of mesopores, and a subsequent magnesiothermic reaction with sodium chloride converts silica to silicon without the collapse of the nanostructure. Owing to the three-dimensionally interconnected and highly porous structure with a small crystallite size (∼10 nm), the converted mesoporous silicon, when used as a Li-ion battery anode, exhibits superior cycle performance and rate capability, compared with commercial silicon materials. We expect the synthesis of nanostructured silicon by recycling waste iron slag and its successful application to open up new avenues in the field of sustainable industrial development.</P>
Chun, Jinyoung,Jo, Changshin,Sahgong, Sunhye,Kim, Min Gyu,Lim, Eunho,Kim, Dong Hyeon,Hwang, Jongkook,Kang, Eunae,Ryu, Keun Ah,Jung, Yoon Seok,Kim, Youngsik,Lee, Jinwoo American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.51
<P>Metal fluorides (MFx) are one of the most attractive cathode candidates for Li ion batteries (LIBs) due to their high conversion potentials with large capacities. However, only a limited number of synthetic methods, generally involving highly toxic or inaccessible reagents, currently exist, which has made it difficult to produce well-designed nanostructures suitable for cathodes; consequently, harnessing their potential cathodic properties has been a challenge. Herein, we report a new bottom-up synthetic method utilizing ammonium fluoride (NH4F) for the preparation of anhydrous MFx (CuF2, FeF3, and CoF2)/mesoporous carbon (MSU-F-C) nanocomposites, whereby a series of metal precursor nanoparticles preconfined in mesoporous carbon were readily converted to anhydrous MFx through simple heat treatment with NH4F under solventless conditions. We demonstrate the versatility, lower toxicity, and efficiency of this synthetic method and, using XRD analysis, propose a mechanism for the reaction. All MFx/MSU-F-C prepared in this study exhibited superior electrochemical performances, through conversion reactions, as the cathode for LIBs. In particular, FeF3/MSU-F-C maintained a capacity of 650 mAh g(FeF3)(-1) across 50 cycles, which is similar to 90% of its initial capacity. We expect that this facile synthesis method will trigger further research into the development of various nanostructured MFx for use in energy storage and other applications.</P>
Chun, Jinyoung,Jeon, Sang K.,Chun, Jang H. The Korean Electrochemical Society 2013 한국전기화학회지 Vol.16 No.4
At Pt(111), Pt(100), Pt, and Rh interfaces, the Frumkin adsorption isotherm of underpotentially deposited hydrogen (UPD H) and related electrode kinetic data are determined using the standard Gibbs energy of adsorption. The Temkin adsorption isotherm of UPD H correlating with the Frumkin adsorption isotherm of UPD H is readily determined using the correlation constants between the Temkin and Frumkin or Langmuir adsorption isotherms. At the Pt(111), Pt(100), Pt, and Rh interfaces, the lateral repulsive interaction between the UPD H species is interpreted using the interaction parameter for the Frumkin adsorption isotherm. The lateral repulsive interaction between the UPD H species at the Pt(111), Pt(100), Pt, and Rh interfaces is significantly different from the lateral attractive interaction between the overpotentially deposited hydrogen (OPD H) species at Pt, Ir, and Pt-Ir alloy interfaces.
Using waste Li ion batteries as cathodes in rechargeable Li–liquid batteries
Chun, Jinyoung,Chung, Moonsik,Lee, Jinwoo,Kim, Youngsik The Royal Society of Chemistry 2013 Physical chemistry chemical physics Vol.15 No.19
<P>The rechargeable Li–liquid battery was developed using waste Li ion battery materials immersed in water and used as the liquid cathode. Either the Li metal or Li ions (by the formation Li<SUB><I>x</I></SUB>C<SUB>6</SUB> or Li<SUB>4+<I>x</I></SUB>Ti<SUB>5</SUB>O<SUB>12</SUB>) was harvested from waste Li ion source materials such as a waste anode (Li<SUB><I>x</I></SUB>C<SUB>6</SUB>), cathode (Li<SUB><I>x</I></SUB>FePO<SUB>4</SUB>), and electrolyte (LiPF<SUB>6</SUB> in EC:DEC) by charging the cell, which then discharged with the waste products in the liquid cathode solution to produce electric energy. When the Li<SUB>4</SUB>Ti<SUB>5</SUB>O<SUB>12</SUB> was used as the anode with the waste products as the cathode in the proposed battery system, a good cycle-life with high coulombic efficiency was observed.</P> <P>Graphic Abstract</P><P>The rechargeable Li–liquid battery was developed using a waste Li ion battery immersed in water to be used as the liquid cathode. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cp00006k'> </P>