Recently, a squad of engineers at UC San Diego led yesteryear professor of mechanical engineering Prab Bandaru in addition to involving Ph.D. students Hidenori Yamada in addition to Rajaram Narayanan, probed inwards detail, both theoretically in addition to experimentally, the specific characteristics of a nanostructured cloth amongst honor to its resultant on accuse transfer. They demonstrated that inwards a one-dimensional nanotube, the electrons are confined to a line, spell inwards two-dimensional graphene, the electrons are confined to a plane. Based on these findings, the researchers await that the restriction on electron motility hinders accuse transfer in addition to electrochemical kinetics. On the other hand, the reduced electron scattering could heighten the kinetics. The squad resolved these issues yesteryear taking payoff of the specific organisation of the electrons inwards the nanostructure. They applied their theories to explicate the experimental variation of the electrochemical charge per unit of measurement constant of unmarried layer graphene.
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| (a) Atomic forcefulness microscopy picture of a department of the unmarried layer graphene (SLG) sample transferred onto a p-Si/SiO2 substrate. The wrinkles on the sample surface corresponding to the delineate scan (white line) are displayed inwards the lower left inset. The Raman spectrum of the transferred SLG is indicated inwards the top correct inset. (b) Schematic of the three-electrode droplet electrochemical jail mobile telephone (actual experimental organisation shown inwards the top correct inset). The SLG working electrode (WE), Pt wire counter electrode (CE) in addition to a reference (REF) saturated calomel electrode are indicated. |
The researchers detailed their findings inwards a recent number of the Journal of Physical Chemistry Letters.
The squad discovered that the accuse transfer charge per unit of measurement may either increase, decrease or stay constant, in addition to that such variation is sensitive to the orientation likewise equally the relevant dimensionality of the nanostructure. As accuse transfer per unit of measurement fourth dimension determines the electrical electrical current that may survive obtained from a given electrode, the UC San Diego written report provides a delineate of piece of occupation solid rationale for the role of nanostructures inwards accuse storage electrodes, amongst applications encompassing solid solid soil battery-related systems, wearable sensors, etc., where electrical electrical current modulations would affect unloose energy in addition to ability delivery.
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| A plot of the accuse transfer related electrochemical charge per unit of measurement constant (k) normalized to the kη=0V equally a business office of the applied voltage (η), considered amongst honor to the redox potential. The experimental information is a piteous tally amongst the theoretical fits expected from conventional Butler-Volmer (B-V) kinetics likewise equally three-dimensional Marcus-Hush-Chidsey (MHC) kinetics, but could survive tally good through a dimensionality subject electrochemical model proposed yesteryear a squad of engineers at UC San Diego. |
Paper: Dimensionality-Dependent Electrochemical Kinetics at the Single-Layer Graphene–Electrolyte Interface, R. Narayanan, H. Yamada, B.C. Marin, A. Zaretski, in addition to P.R. Bandaru, J. Phys. Chem. Lett., 2017, 8 (17), pp 4004–4008. Sumber http://jacobsschoolofengineering.blogspot.com/