BIVO4/TIO2/GRAPHENE NANOCOMPOSITE PHOTOANODE FOR ENHANCED PHOTOELECTROCHEMICAL PERFORMANCE

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YOUSEFZADEH S.; MOSHFEGH A.Z.

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Seminar Paper

Paper Information

Seminar: ANNUAL ELECTROCHEMISTRY SEMINAR OF IRAN
Year:2014 | Issue:10

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Title

BIVO4/TIO2/GRAPHENE NANOCOMPOSITE PHOTOANODE FOR ENHANCED PHOTOELECTROCHEMICAL PERFORMANCE

Author(s)

YOUSEFZADEH S. | MOSHFEGH A.Z. | Issue Writer Certificate

Keywords

PHOTOCURRENT DENSITY

VISIBLE ACTIVITY

MULTIPLE ELECTRON TRANSFER

LIGHT HARVESTING

Abstract

GROWTH OF THE WORLD POPULATION AND SHORTAGE OF FOSSIL FUELS MANDATE OUR SOCIETY TO SEARCH FOR ALTERNATIVE CLEAN ENERGY USING APPROPRIATE PHOTOCATALYST. TIO2 HAS BEEN PROVEN TO BE THE MOST ACTIVE PHOTOELECTRODE FOR PHOTOELECTROCHEMICAL (PEC) APPLICATIONS BUT ITS WIDE BAND GAP LIMITS ITS USAGE IN UV REGION OF SOLAR SPECTRUM [1]. TO HARVEST THE UV/VISIBLE PORTION OF THE SOLAR SPECTRUM AND IMPROVE ITS CARRIER ELECTRICAL CONDUCTIVITY, THE PHOTOANODE CAN CONSIST OF TIO2 ACCOMPANIED WITH A VISIBLE ACTIVE NARROWER BAND GAP SEMICONDUCTOR SUCH AS BIVO4 AND GRAPHENE AS A MATERIAL WITH HIGH ELECTRON MOBILITY AND SURFACE AREA. IN THIS PAPER, WE HAVE USED BAND ENERGETIC CALCULATION TO DESIGN VISIBLE ACTIVE BIVO4/TIO2/GRAPHENENANOCOMPOSITE THIN FILM AND THEN SYNTHESIZED IT AS PHOTOANODE IN PEC CELL. THE PEC PERFORMANCE OF THE BIVO4/TIO2/GRAPHENENANOCOMPOSITE WAS COMPARED WITH PURE TIO2 AND TIO2/GRAPHENE PHOTOELECTRODE UNDER SIMILAR CONDITIONS. TIO2/GRAPHENE SOLUTION WAS PREPARED BY COUPLING TIO2 NANOPARTICLES SYNTHESIZED BY SOL-GEL METHOD ON GRAPHENE OXIDE (GO) SHEET VIA PHOTOCATALYTIC PROCESS AND THEN IT COATED ON TRANSPARENT CONDUCTING OXIDE SUBSTRATE (IN HERE FTO) BY SPIN COATING AND SUBSEQUENTLY ANNEALED UNDER ARGON GAS AT 350OC. AN EFFICIENT BIVO4 LAYER WAS FORMED BY DIPPING THE DEPOSITED TIO2/GRAPHENE THIN FILM ELECTRODE IN AN AQUEOUS NITRIC ACID SOLUTION OF BI (NO3)3 AND NH4VO3. SURFACE ANALYTICAL TECHNIQUES SUCH AS SEM, AFM, XPS ANALYSIS AND UV/VIS SPECTROSCOPY WERE USED TO DETERMINE CHEMICAL AND PHYSICAL PROPERTIES OF ALL INVESTIGATED FILMS. A THREE-ELECTRODE GALVANOSTAT/POTENTIOSTAT (AUTOLABPGSTAT302) WITH A PLATINUM AS COUNTER ELECTRODE, AG/AGCL AS REFERENCE ELECTRODE AND THE PREPARED THIN FILM SAMPLES AS WORKING ELECTRODE, 0.1M K2SO4 AQUEOUS SOLUTION AS ELECTROLYTE AND A XENON SHORT ARC LAMP (OSRAM 5000W HBM/OFR AS VISIBLE IRRADIATION SOURCE WITH THE INTENSITY OF ABOUT 1 SUN WERE USED TO EVALUATE THEIR PEC ACTIVITY. FIG.1 DEPICTS THE PHOTOCURRENT DENSITY OF DIFFERENT SAMPLES OBTAINED IN THE CHOPPED I-T CURVES AT CONSTANT APPLIED POTENTIAL OF 0.8 V VERSUS AG/AGCL REFERENCE ELECTRODE. AS SEEN, THE BIVO4/TIO2/GRAPHENENANOCOMPOSITEPHOTOELECTRODE EXHIBITS THE HIGHTESTPHOTOACTIVITY AT ABOUT 3 A/M2 AS COMPARED WITH THE TIO2 AND TIO2/GRAPHENEPHOTOELECTRODES. VISIBLE LIGHT ABSORPTION OF BIVO4, HIGH ELECTRON ACCEPTANCE OF THE GRAPHENE AND THE MULTISTEP ELECTRON TRANSFER ARE BELIEVED TO BE RESPONSIBLE FOR THE OBSERVED PHOTOENHANCEMENT.

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APA: Copy

YOUSEFZADEH, S., & MOSHFEGH, A.Z.. (2014). BIVO₄/TIO₂/GRAPHENE NANOCOMPOSITE PHOTOANODE FOR ENHANCED PHOTOELECTROCHEMICAL PERFORMANCE. ANNUAL ELECTROCHEMISTRY SEMINAR OF IRAN. SID. https://sid.ir/paper/917300/en

Vancouver: Copy

YOUSEFZADEH S., MOSHFEGH A.Z.. BIVO₄/TIO₂/GRAPHENE NANOCOMPOSITE PHOTOANODE FOR ENHANCED PHOTOELECTROCHEMICAL PERFORMANCE. 2014. Available from: https://sid.ir/paper/917300/en

IEEE: Copy

S. YOUSEFZADEH, and A.Z. MOSHFEGH, “BIVO₄/TIO₂/GRAPHENE NANOCOMPOSITE PHOTOANODE FOR ENHANCED PHOTOELECTROCHEMICAL PERFORMANCE,” presented at the ANNUAL ELECTROCHEMISTRY SEMINAR OF IRAN. 2014, [Online]. Available: https://sid.ir/paper/917300/en

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