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Synthesis of cerium and nickel doped titanium nanofibers for hydrolysis of sodium borohydride
Tamboli, Ashif H.,Gosavi, S.W.,Terashima, Chiaki,Fujishima, Akira,Pawar, Atul A.,Kim, Hern Elsevier 2018 CHEMOSPHERE - Vol.202 No.-
<P><B>Abstract</B></P> <P>A recyclable titanium nanofibers, doped with cerium and nickel doped was successfully synthesized by using sol-gel and electrospinning method for hydrogen generation from alkali free hydrolysis of NaBH<SUB>4</SUB>. The resultant nanocomposite was characterized to find out the structural and physical-chemical properties by a series of analytical techniques such as FT-IR (Fourier transform infrared spectroscopy), XRD (X-ray diffraction), SEM (scanning electron microscope), EDX (energy-dispersive X-ray spectroscopy),N<SUB>2</SUB> adsorption-desorption and BET (Brunauer–Emmett–Teller), etc. The results revealed that cerium and nickel nanoparticles were homogeneously distributed on the surface of the TiO<SUB>2</SUB> nanofibers due to having similar oxidation state and atomic radium of TiO<SUB>2</SUB>nanofibers with CeO<SUB>2</SUB> and NiO for the effective immobilization of metal ions. The NiO doped catalyst showed superior catalytic performance towards the hydrolysis reaction of NaBH<SUB>4</SUB> at room temperature. These catalysts have ability to produce 305 mL of H<SUB>2</SUB> within the time of 160 min at room temperature. Additionally, reusability test revealed that the catalyst is active even after five runs of hydrolytic reaction, implying the as-prepared NiO doped TiO<SUB>2</SUB> nanofibers could be considered as a potential candidate catalyst for portable hydrogen fuel system such as PEMFC (proton exchange membrane fuel cells).</P> <P><B>Highlights</B></P> <P> <UL> <LI> A recyclable metal doped TiO<SUB>2</SUB> electrospun nanofibers was successfully synthesized. </LI> <LI> Beadles nanofibers and uniform distribution of doped metal facilitate stability to catalyst. </LI> <LI> The metal doped catalyst showed superior activity for hydrolysis of NaBH<SUB>4</SUB>. </LI> <LI> The metal doped TiO<SUB>2</SUB> catalyst could be used repeatedly without significant loss in activity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Sudhagar, P.,Devadoss, Anitha,Song, Taeseup,Lakshmipathiraj, P.,Han, Hyungkyu,Lysak, Volodymyr V.,Terashima, C.,Nakata, Kazuya,Fujishima, A.,Paik, Ungyu,Kang, Yong Soo The Royal Society of Chemistry 2014 Physical chemistry chemical physics Vol.16 No.33
<P>We demonstrate one-step gold nanoparticle (AuNP) coating and the surface nitridation of TiO<SUB>2</SUB> nanowires (TiO<SUB>2</SUB>-NWs) to amplify visible-light photon reflection. The surface nitridation of TiO<SUB>2</SUB>-NW arrays maximizes the anchoring of AuNPs, and the subsequent reduction of the band gap energy from 3.26 eV to 2.69 eV affords visible-light activity. The finite-difference time-domain (FDTD) simulation method clearly exhibits the enhancement in the strengths of localized electric fields between AuNPs and the nanowires, which significantly improves the photocatalytic (PC) performance. Both nitridation and AuNP decoration of TiO<SUB>2</SUB>-NWs result in beneficial effects of high (e<SUP>−</SUP>/h<SUP>+</SUP>) pair separation through healing of the oxygen vacancies. The combined effect of harvesting visible-light photons and reducing recombination in Au/N-doped TiO<SUB>2</SUB>-NWs promotes the photocatalytic activity towards degradation of methyl orange to an unprecedented level, ∼4 fold (1.1 × 10<SUP>−2</SUP> min) more than does TiO<SUB>2</SUB>-NWs (2.9 × 10<SUP>−3</SUP> min<SUP>−1</SUP>). The proposed AuNP decoration of nitridated TiO<SUB>2</SUB>-NW surfaces can be applied to a wide range of n-type metal oxides for photoanodes in photocatalytic applications.</P> <P>Graphic Abstract</P><P>Maximizing the Au nanoparticle decoration on TiO<SUB>2</SUB> nanowire through nitrogen doping for simultaneous enhancement in visible light scattering and electron–hole charge separation. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp02009j'> </P>
Infrared pseudogap in cuprate and pnictide high-temperature superconductors
Moon, S. J.,Lee, Y. S.,Schafgans, A. A.,Chubukov, A. V.,Kasahara, S.,Shibauchi, T.,Terashima, T.,Matsuda, Y.,Tanatar, M. A.,Prozorov, R.,Thaler, A.,Canfield, P. C.,Bud'ko, S. L.,Sefat, A. S.,Mandrus, American Physical Society 2014 Physical review. B, Condensed matter and materials Vol.90 No.1
Choi, J.,Sudhagar, P.,Kim, J.,Kwon, J.,Kim, J.,Terashima, C.,Fujishima, A.,Song, T.,Paik, U. Royal Society of Chemistry 2017 Physical chemistry chemical physics Vol.19 No.6
<P>We demonstrate the dual advantages of graded photoabsorbers in mesoporous metal oxide-based hetero interfacial photoanodes in improving photogenerated charge carrier (e(-)/h(+)) separation for the solar light-driven water-oxidation process. The pre-deposition of sol-gel-derived, tungsten-doped bismuth vanadate (W:BiVO4) onto a primary BiVO4 water oxidation layer forms graded interfaces, which facilitate charge transfer from the primary photoabsorber to the charge transport layer, thereby superseding the thickness-controlled charge recombination at the BiVO4 water oxidation catalyst. As a result, the WO3/BiVO4 hetero photoanode containing the photoactive W: BiVO4 interfacial layer showed 130% higher photocurrent than that of the interfacial layer-free hetero photoelectrode owing to the enhanced charge separation led water oxidation process.</P>
Devadoss, Anitha,Sudhagar, P.,Das, Santanu,Lee, Sang Yun,Terashima, C.,Nakata, K.,Fujishima, A.,Choi, Wonbong,Kang, Yong Soo,Paik, Ungyu American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.7
<P>We report the fabrication of graphene–WO<SUB>3</SUB>–Au hybrid membranes and evaluate their photocatalytic activity towards glucose oxidase mediated enzymatic glucose oxidation. The dual-functionality of gold nanoparticles in the reinforcement of visible light activity of graphene–WO<SUB>3</SUB> membranes and improving the catalytic activity of immobilized enzymes for unique photoelectrochemical sensing application is demonstrated. This work provides new insights into the fabrication of light-sensitive hybrid materials and facilitates their application in future.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-7/am4058925/production/images/medium/am-2013-058925_0011.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am4058925'>ACS Electronic Supporting Info</A></P>