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Title: Thermostatistical description of small systems in nonequilibrium conditions: Energy conversion and harvesting
Author: Santamaría Holek, Iván
Pérez Madrid, Agustín
Keywords: Histèresi
Conversió directa de l'energia
Termodinàmica estadística
Termodinàmica del desequilibri
Direct energy conversion
Statistical thermodynamics
Nonequilibrium thermodynamics
Issue Date: 30-Jan-2014
Publisher: American Physical Society
Abstract: Hysteresis cycles are very important features of energy conversion and harvesting devices, such as batteries. The efficiency of these may be strongly affected by the physical size of the system. Here, we show that in systems which are small enough, the existence of physical boundaries which produce nonhomogeneities of the interaction potential gives rise to inflections and barriers in the associated free energy. This in turn brings on irreversible processes which can be triggered under suitable external conditions imposed by a heat bath. As an example, by controlling the temperature, the state of a small system may be impelled to oscillate between two different structural configurations or aggregation states avoiding equilibrium coexistence and therefore dissipating energy. This cyclical behavior associated with a hysteresis cycle may be prototypical of energy conversion, storage, or generating nanodevices, as exemplified by Li-ion insertion batteries.
Note: Reproducció del document publicat a:
It is part of: Physical Review E, 2014, vol. 89, p. 012144-1-012144-9
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ISSN: 1539-3755
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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