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Bhande, Sambhaji S.,Ambade, Rohan B.,Shinde, Dipak V.,Ambade, Swapnil B.,Patil, Supriya A.,Naushad, Mu.,Mane, Rajaram S.,Alothman, Z. A.,Lee, Soo-Hyoung,Han, Sung-Hwan American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.45
<P>Here we report functionalized multiwalled carbon nanotubes (<I>f</I>-MWCNTs)–CdSe nanocrystals (NCs) as photosensitizer in photoelectrochemical cells, where <I>f</I>-MWCNTs were uniformly coated with CdSe NCs onto SnO<SUB>2</SUB> upright standing nanosheets by using a simple electrodeposition method. The resultant blended photoanodes demonstrate extraordinary electrochemical properties including higher Stern–Volmer constant, higher absorbance, and positive quenching, etc., caused by more accessibility of CdSe NCs compared with pristine SnO<SUB>2</SUB>–CdSe photoanode. Atomic and weight percent changes of carbon with <I>f</I>-MWCNTs blending concentrations were confirmed from the energy dispersive X-ray analysis. The morphology images show a uniform coverage of CdSe NCs over <I>f</I>-MWCNTs forming a core–shell type structure as a blend. Compared to pristine CdSe, photoanode with <I>f</I>-MWCNTs demonstrated a 257% increase in overall power conversion efficiency. Obtained results were corroborated by the electrochemical impedance analysis. Higher scattering, more accessibility, and hierarchical structure of SnO<SUB>2</SUB>-<I>f</I>-MWCNTs-blend–CdSe NCs photoanode is responsible for higher (a) electron mobility (6.89 × 10<SUP>–4</SUP> to 10.89 × 10<SUP>–4</SUP> cm<SUP>2</SUP> V<SUP>–1</SUP> S<SUP>1–</SUP>), (b) diffusion length (27 × 10<SUP>–6</SUP>), (c) average electron lifetime (32.2 ms), and transit time (1.15 ms).</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-45/acsami.5b05385/production/images/medium/am-2015-05385e_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b05385'>ACS Electronic Supporting Info</A></P>
DSSCs synergic effect in thin metal oxide layer-functionalized SnO<sub>2</sub> photoanodes
Bhande, S.S.,Shinde, D.V.,Tehare, K.K.,Patil, S.A.,Mane, R.S.,Naushad, Mu.,Alothman, Z.,Hui, K.N.,Han, S.H. Elsevier Sequoia 2014 Journal of photochemistry and photobiology Chemist Vol.295 No.-
DSSCs synergic effect, for reducing charge recombination and energizing charge transfer, in SnO<SUB>2</SUB> photoanodes functionalized with thin layers of several metal oxides including ZrO<SUB>2</SUB>, MgO, CaCO<SUB>3</SUB> and ZnO etc., for boosting overall dye-sensitized solar cells (DSSCs) performance is investigated. The SnO<SUB>2</SUB> photoanodes composed with upright-standing nanosheets were initially fabricated using a simple and cost-effective wet chemical method. Both pristine and functionalized SnO<SUB>2</SUB> photoanodes were explored in DSSCs application in addition to other photoelectrochemical properties where, functionalized photoanodes exhibited remarkably improved light-to-electrical power conversion efficiencies compared to that of pristine one. To corroborate synergic effect and for probing the charge transport properties including charge transfer resistance and electron life time in thin metal oxide functionalized SnO<SUB>2</SUB> photoanodes, electrochemical impedance spectroscopy measurement was undertaken.
Effect of a deposition container on the nanostructural growth and DSSC application of rutile TiO2
Tehare, Kailas K.,Zate, Manohar K.,Bhande, Sambhaji S.,Patil, Supriya A.,Gaikwad, Sanjay L.,Yoon, Seong Joon,Mane, Rajaram S.,Lee, Soo-Hyoung,Han, Sung-Hwan The Royal Society of Chemistry 2014 Journal of Materials Chemistry A Vol.2 No.2
Patil, Supriya A.,Shinde, Dipak V.,Lim, Iseul,Cho, Keumnam,Bhande, Sambhaji S.,Mane, Rajaram S.,Shrestha, Nabeen K.,Lee, Joong Kee,Yoon, Tae Hyun,Han, Sung-Hwan The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.15
<▼1><P>A solution based ion exchange mediated strategy for constructing 1-D arrays of porous CoS1.0365 nanorod film from analogous 1-D array of Co3O4 film derived from pyrolysis of nanostructured cobalt hydroxycarbonate film.</P></▼1><▼2><P>Based on a coordination chemistry approach, the present work reports on the synthesis of thin films of various cobalt hydroxycarbonate nanostructures such as nanobeams, nanoneedles, and bending nanorods using three different cobalt precursors <I>viz.</I> Cl<SUP>−</SUP>, NO3<SUP>−</SUP> and CH3COO<SUP>−</SUP>. After pyrolysis in air, the hydroxycarbonate nanostructures are transferred into 1-D arrays of Co3O4 nanorods. The obtained 1-D Co3O4 nanostructures are then transformed into the corresponding analogous shaped 1-D arrays of porous cobalt sulfide (CoS1.0365) nanostructures using a wet chemical transformation method based on an ion exchange approach. The nanostructured films before and after the ion exchange reaction are characterized using field emission electron scanning microscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy (TEM), and inductively coupled plasma mass spectroscopy (ICP-MS) measurements. As a proof-of-concept demonstration for the application, various shaped CoS1.0365 nanorod films synthesized are investigated as a Pt-free counter electrode in dye-sensitized-solar cells (DSSCs). The influence of three different counter anions of the cobalt precursors on the structural, textural, and morphological aspects, and thereby their influence on electronic and electrochemical properties, has been investigated. A correlation among electrical conductivity, charge transfer resistance and electrocatalytic performance of various CoS1.0365 nanorod films obtained from different cobalt precursors has been established. Among the various nanostructures, the thicker nanorod film synthesized using a chloride precursor has demonstrated the best electrocatalytic behavior toward triiodide reduction, which led to a short circuit current density of 18.04 mA cm<SUP>−2</SUP> and energy conversion efficiency of 7.4% of the DSSC. This photovoltaic performance is highly competitive to a current density of 18.26 mA cm<SUP>−2</SUP> and energy conversion efficiency of 7.7% exhibited by the standard Pt counter electrode.</P></▼2>
Promising ZnO-based DSSC performance using HMP molecular dyes of high extinction coefficients
Ganesh, T.,Nguyen, Hong-Minh,Mane, Rajaram S.,Kim, Nakjoong,Shinde, Dipak V.,Bhande, Sambhaji S.,Naushad, Mu.,Hui, K. N.,Han, Sung Hwan The Royal Society of Chemistry 2014 Dalton Transactions Vol.43 No.29
<P>Employing newly synthesized di-substituted tri-phenyl amine (HMP-9) and carbazole (HMP-11) dyes (with limited acidic carboxyl anchor groups), a power conversion efficiency as high as 7.03% in ZnO nanocrystallite (NC)-based dye-sensitized solar cells (DSSCs) is achieved. The specific molecular designs of HMP-09 and HMP-11 consisting of with and without hexyloxy spacer groups, and added tri-phenyl amine or 9-phenyl-9<I>H</I>-carbazole donor groups, respectively, attached on the ancillary ligands are advantageous, evidenced from electrochemical impedance spectroscopy measurements, for ZnO NC-based DSSCs.</P> <P>Graphic Abstract</P><P>Employing newly synthesized di-substituted tri-phenyl amine (HMP-9) and carbazole (HMP-11) dyes, a power conversion efficiency as high as 7.03% in ZnO nanocrystallite-based dye-sensitized solar cells under AM 1.5 G illumination is achieved. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4dt01179a'> </P>
INVERTIBLE AND ISOMETRIC COMPOSITION OPERATORS ON VECTOR-VALUED HARDY SPACES
Sharma, S.D.,Bhand, Udhey Korean Mathematical Society 2004 대한수학회보 Vol.41 No.3
Invertible and isometric composition operators acting on vector-valued Hardy space $H^2$(E) are characterized.