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Related Concept Videos

Potential-Energy Criterion for Equilibrium01:16

Potential-Energy Criterion for Equilibrium

Potential energy or potential function plays an essential role in determining the stability of a mechanical system. If a system is subjected to both gravitational and elastic forces, the potential function of the system can be expressed as the algebraic sum of gravitational and elastic potential energy. If the system is in equilibrium and is displaced by a small amount, then the work done on the system equals the negative of the change in the system's potential energy from the initial to the...
Conservation of Energy: Application01:12

Conservation of Energy: Application

When solving problems using the energy conservation law, the object (system) to be studied should first be identified. Often, in applications of energy conservation, we study more than one body at the same time. Second, identify all forces acting on the object and determine whether each force doing work is conservative. If a non-conservative force (e.g., friction) is doing work, then mechanical energy is not conserved. The system must then be analyzed with non-conservative work. Third, for...
Free Energy01:21

Free Energy

Free energy—abbreviated as G for the scientist Gibbs who discovered it—is a measurement of useful energy that can be extracted from a reaction to do work. It is the energy in a chemical reaction that is available after entropy is accounted for. Reactions that take in energy are considered endergonic and reactions that release energy are exergonic. Plants carry out endergonic reactions by taking in sunlight and carbon dioxide to produce glucose and oxygen. Animals, in turn, break down the...
Free Energy Changes for Nonstandard States03:25

Free Energy Changes for Nonstandard States

The free energy change for a process taking place with reactants and products present under nonstandard conditions (pressures other than 1 bar; concentrations other than 1 M) is related to the standard free energy change according to this equation:
Power and Energy01:12

Power and Energy

The power and energy delivered to an element are subjects of great significance in the field of electrical engineering. It is a well-known fact that a 100-watt light bulb emits more light than a 60-watt one. Therefore, power and energy calculations play a crucial role in the analysis of electrical circuits.
Power, defined as the time rate of expending or absorbing energy, is quantified in units called watts (W). The relation between power and energy is mathematically given as
Energy Conservation and Bernoulli's Equation01:16

Energy Conservation and Bernoulli's Equation

Applying the conservation of energy principle or the work-energy theorem to an incompressible, inviscid fluid in laminar, steady, irrotational flow leads to Bernoulli's equation. It states that the sum of the fluid pressure, potential, and kinetic energy per unit volume is constant along a streamline.
All the terms in the equation have the dimension of energy per unit volume. The kinetic energy per unit volume is called the kinetic energy density, and the potential energy per unit volume is...

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Updated: Jun 1, 2026

Membraneless Hydrogen Peroxide Fuel Cells as a Promising Clean Energy Source
06:39

Membraneless Hydrogen Peroxide Fuel Cells as a Promising Clean Energy Source

Published on: October 20, 2023

Peer reviewed: toward a nonpolluting energy system.

R U Ayres, P Frankl

    Environmental Science & Technology
    |June 10, 2011
    PubMed
    Summary

    Advances in fuel cell and photovoltaic technology make renewable energy goals more achievable. These innovations are key to developing sustainable energy solutions for the future.

    Area of Science:

    • Energy Science
    • Materials Science
    • Engineering

    Background:

    • The transition to renewable energy sources is a critical global challenge.
    • Existing energy technologies face limitations in efficiency and scalability.
    • Technological advancements are crucial for achieving sustainable energy targets.

    Purpose of the Study:

    • To assess the impact of recent technological progress on renewable energy goals.
    • To evaluate the feasibility of current energy targets in light of new innovations.

    Main Methods:

    • Review of advancements in fuel cell technology.
    • Analysis of progress in photovoltaic (solar cell) technology.
    • Assessment of the integration potential of these technologies.

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    Evaluation of Integrated Anaerobic Digestion and Hydrothermal Carbonization for Bioenergy Production

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    Solar-Driven Electrochemical Green Fuel Production from CO2 and Water Using Ti3C2Tx MXene-Supported CuZn and NiCo Catalysts

    Published on: November 7, 2025

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    Last Updated: Jun 1, 2026

    Membraneless Hydrogen Peroxide Fuel Cells as a Promising Clean Energy Source
    06:39

    Membraneless Hydrogen Peroxide Fuel Cells as a Promising Clean Energy Source

    Published on: October 20, 2023

    Evaluation of Integrated Anaerobic Digestion and Hydrothermal Carbonization for Bioenergy Production
    07:34

    Evaluation of Integrated Anaerobic Digestion and Hydrothermal Carbonization for Bioenergy Production

    Published on: June 15, 2014

    Solar-Driven Electrochemical Green Fuel Production from CO2 and Water Using Ti3C2Tx MXene-Supported CuZn and NiCo Catalysts
    10:15

    Solar-Driven Electrochemical Green Fuel Production from CO2 and Water Using Ti3C2Tx MXene-Supported CuZn and NiCo Catalysts

    Published on: November 7, 2025

    Main Results:

    • Significant improvements in fuel cell efficiency and cost-effectiveness.
    • Enhanced performance and reduced manufacturing costs for photovoltaic cells.
    • Increased viability of renewable energy systems due to these technological strides.

    Conclusions:

    • The integration of advanced fuel cells and photovoltaic technology makes ambitious renewable energy goals more attainable.
    • Continued innovation in these areas is essential for a sustainable energy future.