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Transpiration Driven Electrokinetic Power Generator.

Tae Gwang Yun1, Jaehyeong Bae1, Avner Rothschild2

  • 1Department of Materials Science and Engineering , Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro , Yuseong-gu, Daejeon 34141 , Republic of Korea.

ACS Nano
|October 17, 2019
PubMed
Summary
This summary is machine-generated.

A novel transpiration-driven electrokinetic power generator (TEPG) uses water flow in carbon black-coated fabric. This device generates electricity from plant transpiration, powering small electronics.

Keywords:
capillary flowcotton fabricelectrical double layerpower generatorpseudostreaming currentscalabilitytranspiration

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Plant Physiology

Background:

  • Transpiration is a vital plant process involving water transport from roots to leaves.
  • Sustainable energy generation is crucial for powering small electronic devices.
  • Electrokinetic phenomena, like streaming potential, can convert mechanical energy into electrical energy.

Purpose of the Study:

  • To develop a transpiration-driven electrokinetic power generator (TEPG).
  • To investigate the potential of using plant transpiration for sustainable power generation.
  • To characterize the performance of the TEPG based on material properties.

Main Methods:

  • Fabricating a TEPG using asymmetrically wetted cotton fabric coated with carbon black.
  • Exploiting the capillary flow of water during transpiration.
  • Utilizing the electrical double layer at the carbon black/water interface to generate a potential difference.
  • Measuring the voltage, current, and energy density of the TEPG.

Main Results:

  • The TEPG generates a potential difference due to proton accumulation at the solid/liquid interface.
  • The carbon black coating facilitates current flow via the pseudostreaming mechanism.
  • A 90 mm × 30 mm × 0.12 mm TEPG achieved a maximum voltage of 0.53 V and current of 3.91 μA.
  • The energy density reached up to 1.14 mWh cm⁻³.
  • Multiple TEPGs could power a light-emitting diode or charge a supercapacitor.

Conclusions:

  • The TEPG effectively converts the energy from plant transpiration into electrical power.
  • The device demonstrates potential for self-powered sensors and low-power electronics in various applications.
  • Optimization of carbon black loading can enhance the power generation capabilities of the TEPG.