Prussian Blue Analogues as Promising Thermal Power Generation Materials

Yuya Fukuzumi, Kaoru Amaha, Wataru Kobayashi, Hideharu Niwa, Yutaka Mortitomo

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The thermal coefficient (α=dV/dT) of redox potential (V) enables an efficient thermal power generation using waste heat. Actually, a battery-type thermocell, which consists of two kinds of redoxable solids with different α as anode and cathode, is demonstrated to produce electric energy in thermal cycles. To fabricate high performance device, α is systematically investigated in three kinds of Prussian blue analogues (PBAs), NaxCo[Fe(CN)6]0.71 (abbreviated as NCF71), NaxCo[Fe(CN)6]0.90 (NCF90) and NaxMn[Fe(CN)6]0.83 (NMF83), against the Na+ concentration (x). NCF90 shows the highest positive α (=1.4 mV K−1) in the lower-lying plateau while NMF83 shows the highest negative α (=−0.4 mV K−1) in the lower-lying plateau. In addition, the NCF90/NMF83 thermocell produces 5.5 meV/NCF90 in the initial cycle between TL (=286 K) and TH (=313 K). The thermal efficiency (η=2.3 %) reaches 27 % of the Carnot efficiency (ηcarnot=8.7 %). Thus, PBAs are promising materials for thermal power generation.

Original languageEnglish
JournalEnergy Technology
DOIs
Publication statusAccepted/In press - 2018 Jan 1
Externally publishedYes

Keywords

  • Prussian blue analogues
  • thermal coefficient of redox potential
  • thermal power generation

ASJC Scopus subject areas

  • Energy(all)

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