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Thread: Photoswitchable supercapacitor

  1. #1 Photoswitchable supercapacitor 
    Forum Freshman
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    Apr 2013
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    Hi. I've recently read a paper on photoswitchable microsupercapacitor but I don't understand how capacitance is being altered by the photoswitching molecule (dairylethene). Specifically I want to understand the following sentences :
    "Employing terahertz (THz) spectroscopy, we further reveal that the reversible modulation of the capacitance is accompanied by reversible shift of charge equilibrium at the DAE/graphene
    interface upon photoisomerization. We propose that, alongside
    the charge equilibrium process, a static dipole is generated
    across the DAE−graphene interface, which reduces the charge
    injection barrier in the capacitor and thus enhances the
    capacitance of the system."

    The paper is linked below. I don't know if I should attach the pdf version of it since it is a paid journal and I accessed it through University server.

    Please know that I have a background of electronics so I don't understand chemistry as well as you all.

    Thanks.

    http://pubs.acs.org/doi/abs/10.1021/jacs.7b04491


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  3. #2  
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    Quote Originally Posted by fine View Post
    Hi. I've recently read a paper on photoswitchable microsupercapacitor but I don't understand how capacitance is being altered by the photoswitching molecule (dairylethene). Specifically I want to understand the following sentences :
    "Employing terahertz (THz) spectroscopy, we further reveal that the reversible modulation of the capacitance is accompanied by reversible shift of charge equilibrium at the DAE/graphene
    interface upon photoisomerization. We propose that, alongside
    the charge equilibrium process, a static dipole is generated
    across the DAE−graphene interface, which reduces the charge
    injection barrier in the capacitor and thus enhances the
    capacitance of the system."

    The paper is linked below. I don't know if I should attach the pdf version of it since it is a paid journal and I accessed it through University server.

    Please know that I have a background of electronics so I don't understand chemistry as well as you all.

    Thanks.

    http://pubs.acs.org/doi/abs/10.1021/jacs.7b04491
    If your background in electronics is sufficiently strong, then you know how a dielectric material increases capacitance -- it allows more charge to be stored per volt by reducing the electric field for a given quantity of charge. A dielectric accomplishes this feat by the use of the dipoles making up the material. The positive end is attracted to the negative plate, and the negative end is attracted to the positive plate.

    The only difference between traditional dielectrics and the one you describe appears simply to be that the dipoles can be induced to appear when hit with a suitable flux of photons.


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