Open AccessThermal power generation during heat cycle near room temperature
Author(s) -
Takayuki Shibata,
Yuya Fukuzumi,
Wataru Kobayashi,
Yutaka Moritomo
Publication year - 2017
Publication title -
applied physics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.911
H-Index - 94
eISSN - 1882-0786
pISSN - 1882-0778
DOI - 10.7567/apex.11.017101
Subject(s) - carnot cycle , materials science , thermoelectric effect , waste heat , prussian blue , thermodynamics , battery (electricity) , electrochemistry , thermal , analytical chemistry (journal) , chemistry , power (physics) , electrode , physics , heat exchanger , chromatography
We demonstrate that a sodium-ion secondary battery (SIB)-type thermocell consisting of two types of Prussian blue analogue (PBA) with different electrochemical thermoelectric coefficients (S EC ≡ ∂V/∂T; V and T are the redox potential and temperature, respectively) produces electrical energy during heat cycles. The device produces an electrical energy of 2.3 meV/PBA per heat cycle between 295 K (= T L) and 323 K (= T H). The ideal thermal efficiency (η = 1.0%), which is evaluated using the heat capacity (C = 4.16 meV/K) of ideal Na2Co[Fe(CN)6], reaches 11% of the Carnot efficiency (ηth = 8.7%). Our SIB-type thermocell is a promising thermoelectric device that harvests waste heat near room temperature
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