Recently, Professor Guo Wanlin, director of the Institute of Nanoscience of Nanjing University of Aeronautics and Astronautics, and his team used the excellent properties of graphene two-dimensional atomic crystals to discover the new electrokinetic effect of the potential generated by the coupling of graphene and fluid interface. They call it "fluctuation" and show the technology that uses this effect to generate electricity. This research has broken through the traditional understanding of the classical electrokinetic theory of solid-liquid interface for more than two hundred years, creating a new space for pushing graphene two-dimensional materials to daily applications. Related research papers were published in the journal Nature Communications.
Unlike the pressure difference emphasized by the classical electrokinetic theory, Guo Wanlin and his team found in experiments that even under normal pressure, when the surface of liquids such as seawater, which usually contain ions, moves along the graphene surface, it will be produced in graphene. The voltage along the direction of movement of the liquid surface. The researchers used a piece of ruler-sized (20 cm2) graphene sheet into a common ionic solution to produce a voltage of about 0.1 volts or a current of 10 microamperes.
Guo Wanlin introduced that the key to generating electricity in the experiment is to cross the gas-liquid interface during the immersion of graphene, causing the movement of the boundary of the electric double layer along the graphene at the liquid surface. The boundary of the motion of this electric double layer induces charge transfer in graphene, which is equivalent to a local generator, which produces a so-called wave potential in graphene below the liquid. The generated voltage and the velocity of the liquid surface along the surface of the graphene and the length of the graphene inserted into the water are proportional, but the voltage decreases significantly with the increase of the number of graphene layers, which indicates that the graphene of the monoatomic layer is important for the formation of the fluctuating potential. Sex.
The study found that the wave potential in graphene is a new electrokinetic effect, and the theory of double-layer dynamic boundary breaks through the classical electrokinetic theory. The study found the door to new technologies such as graphene-based seawater power generation, sensing and new surface electrochemical parametric measurements.
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