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- 저자 : Thotakuri, Rambabu (검색결과 1 건)
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Pareek, Alka,Thotakuri, Rambabu,Dom, Rekha,Kim, Hyun Gyu,Borse, Pramod H. Elsevier 2017 International journal of hydrogen energy Vol.42 No.1
<P><B>Abstract</B></P> <P>An efficient photoanode of Zn–Cu: doped nanostructure CdS film has been fabricated by a very simple and commercially usable <I>chemical bath deposition</I> methodology. The electrodes of various sizes were deposited, those ranged from 10 × 10 mm to 100 × 100 mm. Physico-chemical property of the film is investigated <I>in-depth</I> for the photo-electrochemical (PEC) hydrogen production and electric-power generation application. Especially, we studied the effect of Zn and Cu <I>co</I>-doping in the hexagonal CdS-lattice <I>w.r.t.</I> the structural, optical and PEC properties of the nanostructure film. Zn-doping induces an increase in the absorption of visible light photons. The doping enhances the photocurrent by twice as to the undoped, and generates a net photocurrent of ∼817 μA/cm<SUP>2</SUP>, at a very low applied potential of 0.1 V/SCE, in contrast to 366 μA/cm<SUP>2</SUP> of its undoped counterpart. Electrochemical impedance spectroscopy demonstrated that the reduced <I>e–h</I> recombination is responsible for the superior performance of the electrodes. PEC cell fabricated by these electrodes showed a <I>maximum hydrogen generation</I> rate of ∼6.74 μmol/h as compared to 0.58 μmol/h from undoped counterpart; Further a <I>photo to electric-power</I> conversion efficiency of ∼0.16% has been achieved even at <I>low biasing</I> potential of <I>0.1 V</I>/SCE under AM 1.5 solar simulated illumination. Undoped, Zn doped and Cu <I>co</I>-doped films are highly useful for <I>dual applications</I> of “<I>solar power-generation</I>” and “<I>solar hydrogen-generation</I>”, revealing that the Zn doped PEC solar cell is most efficient system for the hydrogen generation even at a very low voltage bias of 0.1 V/SCE.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Deposition of Zn and Cu <I>co</I>-doped nanostructure films by chemical bath deposition. </LI> <LI> Structural and optical properties are revealed. </LI> <LI> Doping and <I>Co</I>-doping enhances the photocurrent by more than twice in CdS. </LI> <LI> Zn doped CdS shows improved power conversion and STH efficiency of 0.50% and 0.16% respectively. </LI> <LI> Low cost method for fabrication of dual purpose PEC cell. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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