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Kurian, Sajith,Seo, Hyungtak,Jeon, Hyeongtag American Chemical Society 2013 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.117 No.33
<P>Band gap tuning of the wide band gap semiconductor, TiO<SUB>2</SUB>, has great importance due to its versatile properties in solar cell applications. Visible light activity of TiO<SUB>2</SUB> can enhance the efficiency of the third-generation solar cells by acting itself as light absorbing material. In this study, we demonstrate a surface structure modification and band gap tuning of TiO<SUB>2</SUB> nanotube arrays (TNTA) by anodization accompanied by a short-term, quick annealing process. This TNTA shows absorption both in the UV and entire visible range (400–700 nm, an increase by 350%). The effective band gap is found to be 1.7 eV. Through a detailed analysis we show that the significantly enhanced visible light absorption in the entire visible range is due to the substitutional and interstitial carbon atoms on the surface which introduces a structural disorder and localized states at the surface compared to the bulk. Based on the results from photoemission spectra, the probable band gap modeling shows a band bending at the surface. This behavior points to the excessive electronic conduction at the surface which has both merits and demerits in the applications of TNTAs in photocatalytic and photovoltaics in terms of surface recombination. This is confirmed by a solar cell device fabrication and testing.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2013/jpccck.2013.117.issue-33/jp405207e/production/images/medium/jp-2013-05207e_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp405207e'>ACS Electronic Supporting Info</A></P>
Kurian, Noble K.,Bhat, Sarita G. The Korean Society for Applied Biological Chemistr 2018 Applied Biological Chemistry (Appl Biol Chem) Vol.61 No.2
Melanins are one of the most common pigments produced in nature and distributed throughout the biological kingdom. Vibrio alginolyticus strain BTKKS3 produced DOPA-melanin was used in the study. BTKKS3 melanin inhibited biofilm formation by pathogenic bacteria and effectively decreased the activity of four inflammatory enzymes tested viz. cyclooxygenase, lipoxygenase, myeloperoxidase and nitric oxide synthase. Melanin proved to be less cytotoxic to mouse fibroblast cells with an $IC_{50}$ value of $134.98{\mu}g/mL$. The sun protection factor value of commercial sunscreens was enhanced by 3.42 units by DOPA-melanin.
Kuttiyiel, Kurian A.,Choi, YongMan,Hwang, Sun-Mi,Park, Gu-Gon,Yang, Tae-Hyun,Su, Dong,Sasaki, Kotaro,Liu, Ping,Adzic, Radoslav R. Elsevier 2015 Nano energy Vol.13 No.-
<P><B>Abstract</B></P> <P>Given the harsh operating conditions in hydrogen/oxygen fuel cells, the stability of catalysts is one of the critical questions affecting their commercialization. We describe a distinct class of oxygen reduction (ORR) core–shell electrocatalysts comprised of nitride metal cores enclosed by thin Pt shells that is easily synthesized. The synthesis is reproducible and amenable to scale up. Our theoretical analysis and the experimental data indicate that metal nitride nanoparticle cores could significantly enhance the ORR activity as well as the durability of the core–shell catalysts as a consequence of combined geometrical, electronic and segregation effects on the Pt shells. In addition to its fuel cells application, this class of catalysts holds promise to significantly contribute in resolving the problem of platinum scarcity and furthermore indicates the guidelines for future research and development.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The non-precious metal nitrided core changes the geometric and electronic structure of PtMN/C catalysts. </LI> <LI> Nitriding increases the stability of the core-shell catalyst. </LI> <LI> DFT calculations have shown PtNiN/C at the top of the volcano curve. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kuttiyiel, Kurian A.,Choi, YongMan,Sasaki, Kotaro,Su, Dong,Hwang, Sun-Mi,Yim, Sung-Dae,Yang, Tae-Hyun,Park, Gu-Gon,Adzic, Radoslav R. Elsevier 2016 Nano energy Vol.29 No.-
<P><B>Abstract</B></P> <P>Platinum monolayer electrocatalyst are known to exhibit excellent oxygen reduction reaction (ORR) activity depending on the type of substrate used. Here we demonstrate a relationship between the ORR electrocatalytic activity and the surface electronic structure of Pt monolayer shell induced by various IrM bimetallic cores (M=Fe, Co, Ni or Cu). The relationship is rationalized by comparing density functional theory calculations and experimental results. For an efficient Pt monolayer electrocatalyst, the core should induce sufficient contraction to the Pt shell leading to a downshift of the <SMALL>D</SMALL>-band center with respect to the Fermi level. Depending on the structure of the IrM, relative to that of pure Ir, this interaction not only alters the electronic and geometric structure but also induces segregation effects. Combined these effects significantly enhance the ORR activities of the Pt monolayer shell on bimetallic Ir cores electrocatalysts.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Core-shell structured IrM nanoparticles are better substrates than alloyed counterparts for Pt monolayer electrocatalyst. </LI> <LI> Geometric, electronic, and segregation effects together are crucial to understand the increase in ORR activity. </LI> <LI> DFT calculations demonstrate a volcano type behavior with Pt<SUB>ML</SUB>IrNi/C at the top of the curve. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Noble K. Kurian,Sarita G. Bhat 한국응용생명화학회 2018 Applied Biological Chemistry (Appl Biol Chem) Vol.61 No.2
Melanins are one of the most common pigments produced in nature and distributed throughout the biological kingdom. Vibrio alginolyticus strain BTKKS3 produced DOPA-melanin was used in the study. BTKKS3 melanin inhibited biofilm formation by pathogenic bacteria and effectively decreased the activity of four inflammatory enzymes tested viz. cyclooxygenase, lipoxygenase, myeloperoxidase and nitric oxide synthase. Melanin proved to be less cytotoxic to mouse fibroblast cells with an IC50 value of 134.98 lg/mL. The sun protection factor value of commercial sunscreens was enhanced by 3.42 units by DOPA-melanin.