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RISS 인기검색어
- 검색키워드
- 저자 : Sumon Ganguli (검색결과 2 건)
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Chakraborty, Ashok Kumar,Ganguli, Sumon,Bera, Sandipan,Lee, Wan In Elsevier 2018 Journal of photochemistry and photobiology Chemist Vol.364 No.-
<P><B>Abstract</B></P> <P>An efficient visible-light-harvesting (λ ≥ 420 nm) three component system heterojunction photocatalyst, CdS/BiOCl/Bi<SUB>2</SUB>O<SUB>3</SUB> was prepared by anchoring of CdS nanoparticles on the surface of BiOCl/Bi<SUB>2</SUB>O<SUB>3</SUB> composite. The effect of CdS nanoparticles on the surface of BiOCl/Bi<SUB>2</SUB>O<SUB>3</SUB> composite photocatalyst had been justified in enhancing photocatalytic activity towards the degradation of organic pollutants in gas as well as aqueous phase. With the loading of CdS on to the BiOCl/Bi<SUB>2</SUB>O<SUB>3</SUB> heterojunction composite photocatalyst, the photocatalytic activity of the CdS/BiOCl/Bi<SUB>2</SUB>O<SUB>3</SUB> composite structure has been appreciably improved for the decomposition of 2-propanol (IPA) in gas phase and salicylic acid (SA) in aqueous phase under visible light irradiation (λ ≥ 420 nm). The amount of loading of CdS nanoparticles was optimized to 2 mol% CdS/BiOCl/Bi<SUB>2</SUB>O<SUB>3</SUB>. Compare to bare BiOCl/Bi<SUB>2</SUB>O<SUB>3</SUB> photocatalyst, CdS/BiOCl/Bi<SUB>2</SUB>O<SUB>3</SUB> heterojunction demonstrated 2 times decomposition of IPA in gas phase and 1.8 times of SA in aqueous phase after 120 min. of visible light irradiation. At the same time, with this composition the evolution of CO<SUB>2</SUB> from degradation of IPA was 1.9 times higher than that of BiOCl/Bi<SUB>2</SUB>O<SUB>3</SUB> composite. The enhanced photocatalytic efficiency is deduced from the electron (eˉ) and hole (h<SUP>+</SUP>) transfer among the component semiconductor nanoparticles Bi<SUB>2</SUB>O<SUB>3</SUB>, BiOCl and CdS due to their relative energy band positions. Several experimental evidences were also provided to confirm the electron-hole transfer among the semiconductors and a mechanistic way has been proposed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CdS has been successfully anchored on to the surface of BiOCl/Bi<SUB>2</SUB>O<SUB>3</SUB> composite photocatalyst. </LI> <LI> CdS/BiOCl/Bi<SUB>2</SUB>O<SUB>3</SUB> composite photocatalyst demonstrated higher absorption towards visible light. </LI> <LI> Recombination of photoexcited electrons (e<SUP>−</SUP>) and holes (h<SUP>+</SUP>) has been effectively inhibited. </LI> <LI> Photoinduced hole (h<SUP>+</SUP>) and hydroxyl radical (OH) has been experimentally proved. </LI> <LI> Photocatalytic activity has been remarkably enhanced under visible light. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Performance of Natural Dyes in Dye-Sensitized Solar Cell as Photosensitizer
Sujan Kumar Das,Sumon Ganguli,Humayun Kabir,Jahirul Islam Khandaker,Farid Ahmed 한국전기전자재료학회 2020 Transactions on Electrical and Electronic Material Vol.21 No.1
In this research work five types of titanium dioxide (TiO 2 ) nanocrystalline sol–gel paste with three diff erent types of dye have been prepared and layered on Indium Tin-Oxide coated glass to fabricate dye-sensitized solar cells. The dyes extracted from Malabar spinach seeds (MSS), Red spinach and Pomegranate burgs were used as photosensitizer. All the electrical properties investigated by LCR meter were found to be improved with MSS dye but sample with 0.3 M HNO 3 (sample-3) exhibited the best electrical properties. The current–voltage characteristics for all the samples showed ideal behavior. The highest maximum power of 176.3 μW and efficiency of 9.23% was found for sample-3 with MSS dye. The smallest crystallite size was found to be 28.82 nm for sample-3 by XRD data which was also supported by the SEM results. Thus, this study reveals that MSS dye has the great potential to be used as photosensitizer.
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