Related Experiment Video
Updated: Jul 16, 2025
09:04
A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump
Published on: June 1, 2022
3.1K
High Hydrovoltaic Power Density Achieved by Universal Evaporating Potential Devices
Fei Yu1, Jialun Li1, Yi Jiang2
1Key Laboratory of Advanced Structural Materials, Ministry of Education & Advanced Institute of Materials Science, Changchun University of Technology, Changchun, 130012, P.R. China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|September 15, 2023
Summary
This study presents a novel hydrovoltaic device integrating capacitors and evaporation for sustainable electricity. It achieves high power density, enabling self-powered portable electronics through evaporating potential.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Hydrovoltaic electrical energy generation offers a sustainable alternative for electricity production.
- Key challenges include low output power density and unclear working mechanisms.
Purpose of the Study:
- To develop a stable power supply for portable electronics using hydrovoltaic technology.
- To investigate the underlying mechanism of hydrovoltaic devices.
Main Methods:
- Integration of capacitors with water evaporation devices.
- Fabrication of a green and sustainable device structure utilizing only water and air.
- Experimental characterization of output power density and device performance.
Main Results:
- Achieved a power density of 142.72 µW cm⁻².
- Demonstrated stable power output sufficient for portable electronic devices.
- Identified evaporating potential as the primary working mechanism, distinct from streaming potential.
Conclusions:
- The proposed hydrovoltaic device offers a viable solution for self-driving portable appliances.
- The study provides theoretical support and experimental validation for practical applications.
- This advancement contributes to the field of sustainable energy generation.
Related Concept Videos
02:47Voltaic/Galvanic Cells
57.5K
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
57.5K
01:15Van de Graaff Generator
1.7K
Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...
1.7K
01:16Voltammograms: Overview
237
Voltammograms are current plots as a function of applied potential, offering insights into electrochemical systems. The shape of a voltammogram depends on how the current is measured and whether convection (heat transfer by fluid movement) is present or absent.
Shapes of Voltammograms
Shapes of Voltammograms
237
03:02Standard Electrode Potentials
44.2K
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
44.2K
01:21DC Battery
824
A conductor needs to be a component of a path that creates a closed loop or full circuit to have a continuous current flowing through it. A current starts to flow if an electric field is created inside an isolated conductor that is not part of a full circuit. The conductor quickly develops a net positive charge at one end and a net negative charge at the other. These charges generate an electric field opposite the direction of the applied electric field, which reduces the current. Eventually,...
824
01:26Thermodynamic Potentials
873
Thermodynamic potentials are state functions that are extremely useful in analyzing a thermodynamic system. They have dimensions of energy. The four important thermodynamic potentials are internal energy, enthalpy, Helmholtz free energy, and Gibbs free energy. These thermodynamic potentials can be expressed using two of the following variables: pressure, volume, temperature, and entropy. These two variables are expressed as the rate of change of the thermodynamic potential with respect to other...
873