I have prepared composite materials based on metal oxide and graphene nanostructures. These materials are in powder form. I want to make a film on a substrate to perform cyclic voltammetry.
What would be the suitable substrate?
The working electrode can be prepared by coating the active material onto stainless steel sheets (1cm X 1cm) previously polished with sand paper and ultrasonicated in ethanol for an hour. 70 wt% active material can be mixed with 20 wt% of carbon black and 10 wt% PVDF binder (ratio:7:2:1) in an argate motar in NMP (N-methyl pyrrolidinone) solvent and ground using a pestle. The resulting slurry can then be spread on to the polished stainless steel surface and allowed to dry in a vacuum oven for 24 hours at around 80C. Try to achieve a thickness of over 30 um which is the thickness used in commercial supercaps. See the first two publications for the preparation of electrodes. And check the third one on explanation for the thickness effect. Remember quite contrary to what people believe it is not the mass that impose problems on scaling up the properties it si the thickness that plays the most important problem by limiting the diffusion rate.
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The working electrode can be prepared by coating the active material onto stainless steel sheets (1cm X 1cm) previously polished with sand paper and ultrasonicated in ethanol for an hour. 70 wt% active material can be mixed with 20 wt% of carbon black and 10 wt% PVDF binder (ratio:7:2:1) in an argate motar in NMP (N-methyl pyrrolidinone) solvent and ground using a pestle. The resulting slurry can then be spread on to the polished stainless steel surface and allowed to dry in a vacuum oven for 24 hours at around 80C. Try to achieve a thickness of over 30 um which is the thickness used in commercial supercaps. See the first two publications for the preparation of electrodes. And check the third one on explanation for the thickness effect. Remember quite contrary to what people believe it is not the mass that impose problems on scaling up the properties it si the thickness that plays the most important problem by limiting the diffusion rate.
Article Globular reduced graphene oxide-metal oxide structures for e...
Article Comparison of GO, GO/MWCNTs composite and MWCNTs as potentia...
Article High-Performance Multifunctional Graphene Yarns: Toward Wear...
Hi Abdul Majeed
I suggest for you to make a film on a substrate to perform cyclic voltammetry by coating the active materials
With best regards
Dear Abdul Majeed,
It depends on your final application. But what you can try for your concern is that you disperse your composite material in suitable solvent that finally results in uniform and fine dispersion. Then you need to chose one substrate ( people use different substrates, e.g., ITO, FTO and/or carbon electrode depending upon the final application). You need to dip this electrode into the dispersed solution and make sure that the other arrangements like the counter electrode and reference electrode are fine. Then turn on CV and enjoy :)
Good luck!
You can prepare a slurry of your activae material, PTFE poweder and a background liquid and then spray this slurry on the carbon paper. Selecting the background liquid is too important since your active material should dispers as uniform as possible in this liquid.
Can anyone tell what could be the dimension of an disc electrode? If the sensing part is a disc how it gets conductivity in the electrode design.
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