ELECTROCHEMICAL SYNTHESIS Aj.pptx

ELECTROCHEMICAL SYNTHESIS Aj.pptx

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  ELECTROCHEMICAL SYNTHESIS ARUN.M 1ST MSC NANOSCIENCE&TECH ALAGAPPAUNIVERSITY KARAIKUDI.
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  ELECTROCHEMICAL CELL Electrods Electrods areusuallymetal/strips wires connectedby an electricallyconductingwire. Anode The electrodewherereductiontakesplace. Cathode Theelectrodewherereductiontakesplace.
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  PRINCIPLE 1.Anelectrochemical synthesiscan bebasicallyinterpretedbypassingan electriccurrentbetweentwo or moreelectrodswhichis calledthe anodeandcathodelocatedin electrode. 2.Inthistechnique, theanodecan be oxidizedto metal ionspecies in the electrodeandthe metal ionisolateronreducedto metal bythe cathode withthe assistanceof stabilizers.
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  Design of synthesis Successfulelectrochemical reaction we need to make suitable choice of a reaction parameters: Possibilityto chooseinert or reactivechoiceof electrodeandits composition. SuitablepH, temperature, electrodeconcentration. Possibilityof cells to be dividedor undivided.
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  Mechanism 1.Electriccurrentis actuallypassing anelectrolytecontainingmetalsaltthemetalsedimented withinthecathode. Currentextensivelyutilized byplatingtechnologiststo fabricatemetal. 2.However, basedon the appliedpotential,typeof theanionandthechosenph of thesolution, differenthappento the cathode.
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  • Product • Anode •Power supply • Cathode
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  Silver Nanoparticles 1.Electrochemicalsynthesisof silvernanoparticlesElectrochemicaldepositionis a techniquethat hasbeenwidelyusedfor the synthesisof metal nanoparticles. 2.Electrochemicaldepositionoccursat the interfaceof an electrolytesolutioncontaining the metalto be depositedandan electricallyconductivemetalsubstrate. 3.Silver nanoparticlesweresynthesizedelectrochemicallyusingan electrolyte containing0.01 mM concentration ofAgNO3..
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  4.Theelectrolytewaspreparedfrom doubledeionised waterandthe volumeof the cellwas100 ml. 5.Theglassycarbonelectrodeandthe silvermetal wereemployedasworking electrodeandcounterelectrodes, respectively. 6.Ag NPsshoweddendriticgrowth andit wasfoundthat high concentrationof the silverion favoursthe aggregationand dendritic formation. 7.Theoverallcathodic reductionof silverions at room temperaturecanoccur in the followingway.
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  Characterization 1.TheformationofAg NPs wasconfirmedby X-raydiffraction techniqueusingdiffractometer. 2.Particlesizeandanisotropicnatureof theAg-NPs werecalculated usingScherrer formulaandWilliamson–Hallequation. 3.Diffusereflectancespectroscopy(DRS)was usedto characterisethe optical propertiesof theAg NPs. 4. ScanningElectronMicroscopywas usedto determinethesizeand morphologyof theAgNPsobtainedfromelectrodepositionmethod.
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  Advantages • Easily fabricatedwith advantages of low cost • Low temperature • High purity • Eco-friendly because it avoids the use of reducer agents that usually are toxic
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  Disadvantages • Mass productionis not possible • Can’t predict the structure • Can’t predict size and shape.