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Electrode polarization and energy conversion efficiency in fuel cells

Electrode polarization and energy conversion efficiency in fuel cells

(1) Electrode polarization. When the battery is working (with current passing through the electrodes), the phenomenon that the electrode potential deviates from the reversible potential is called electrode polarization. The larger the deviation value, the more severe the polarization. The degree of polarization of the electrode can be represented by the overpotential n, and the […]

Reversible electromotive force and electrochemical reaction rate of fuel cells

Reversible electromotive force and electrochemical reaction rate of fuel cells

(1) The reversible electromotive force of the battery. The heat-electric energy conversion relationship followed by the fuel cell is ΔG=-nFEr     (1-1) When the activities of the substances participating in the reaction are all equal to 1, rewrite as ΔGΘ=-nFErΘ     (1-2) In the formula: Er is the reversible electromotive force (or reversible potential) of the battery reaction; ΔG […]

Cell reactions of fuel cells

Cell reactions of fuel cells

A fuel cell is an isothermal electrochemical unit that directly converts the chemical energy stored in the fuel and oxidant into electrical energy, and an energy conversion device that directly converts the chemical energy of the supplied fuel into electrical energy. It is a power generation device that can continuously obtain electric power by continuously […]

Characteristics of nuclear energy

Nuclear power is a clean energy

In nature, in addition to organic fuels, nuclear energy, hydropower, wind, solar, geothermal, and tidal energy are all available energy sources. Water power is a pollution-free energy source and should be fully developed and used. However, water power resources are ultimately limited and restricted by geographical conditions. The amount of hydroelectric power generation varies greatly […]

Other components of the nuclear reactor system

Other components of the nuclear reactor system

1. Moderator The moderators currently widely used in thermal neutron reactors are ordinary water, heavy water and graphite. Graphite is a black and soft anisotropic carbon body, which is stable in a wide temperature range. It has good mechanical properties, thermal stability, and low price; its nuclear performance is slightly inferior to heavy water, and […]

Nuclear fuel and coolant for nuclear reactor systems

Nuclear fuel and coolant for nuclear reactor systems

1. Nuclear fuel Nuclear fuel refers to materials containing fissile nuclides (uranium-235, plutonium-239, uranium-233). It can realize self-sustained nuclear fission chain reaction under certain conditions. Currently, the most widely used nuclear fuel is uranium. It is divided into natural uranium (0.72% uranium-235 content), low-enriched uranium (0.7%-20% uranium-235 content) and highly enriched uranium (uranium-235 content 20%-90%) according […]

Nuclear reaction

Nuclear reaction

The huge binding energy of each nucleus and the fact that the probability of collision between different nuclei is very small, so that the nuclear reaction between nuclei that we can see in our daily life is minimal compared to the chemical reaction between atoms. However, the progress of modern science and technology has made it […]

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