Invariant nature of substituted element in metal-hexacyanoferrate

Niwa, Hideharu; Kobayashi, Wataru; Shibata, Takayuki; Nitani, Hiroaki; Moritomo, Yutaka

doi:10.1038/s41598-017-13719-z

Cited by 27 publications

(16 citation statements)

References 26 publications

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“…PBAs, denoted as Na x M [Fe(CN) 6 ] y ( M is a transition metal), show three‐dimensional (3D) cyano‐bridged transition metal network, ‐ M ‐NC−Fe‐CN‐ M ‐, with cubic nanopores of 5 Å on each side . Most of PBAs have face‐centered cubic ( Fm

\overline{3}

m ; Z =4) or trigonal ( R

\overline{3}

m ; Z =3) structures . The reduction/oxidization process of the network causes intercalation/deintercalation of Na + into/from the nanopores.…”

Section: Introductionmentioning

confidence: 99%

Improved Thermal Cyclability of Tertiary Battery Made of Prussian Blue Analogues

et al. 2019

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Tertiary battery is charged by the environmental heat, not by the electric energy, by using the difference (Δα) in the thermal coefficient (α=dV/dT) of redox potential (V) between the anode and cathode materials. The thermal cyclability is not good in the prototypical NaxCo[Fe(CN)6]0.71 (NCF71)/NaxCo[Fe(CN)6]0.90 (NCF90) tertiary battery. Here, we significantly improved the thermal cyclability of the tertiary battery with using Ni‐substituted NaxNi[Fe(CN)6]0.68 (NNF68). The Ni‐substituted NNF68/NCF90 tertiary battery shows good thermal cyclability: both the cell voltage and capacity essentially unchanged up to the 10th thermal cycles.

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\overline{3}

m ; Z =4) or trigonal ( R

\overline{3}

m ; Z =3) structures . The reduction/oxidization process of the network causes intercalation/deintercalation of Na + into/from the nanopores.…”

Section: Introductionmentioning

confidence: 99%

Improved Thermal Cyclability of Tertiary Battery Made of Prussian Blue Analogues

et al. 2019

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“…The cobalt Prussian blue analogue (Co-PBA; Na x Co[Fe(CN) 6 ] y ) is a promising cathode material for Li + /Na + secondary battery [12][13][14] . Co-PBA have face-centered cubic (fcc) (Fm3m; Z = 4) or trigonal (R3m; Z = 3) structures 15 , consisting of a three-dimensional (3D) jungle-gym-type host framework with guest Li + /Na + ions. Figure 1 shows schematic structure of Co-PBA.…”

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confidence: 99%

Energy harvesting thermocell with use of phase transition

Shibata

Iwaizumi

Fukuzumi

et al. 2020

Sci Rep

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A thermocell that consists of cathode and anode materials with different temperature coefficients (α = dV/dT) of the redox potential (V) can convert environmental thermal energy to electric energy via the so-called thermal charging effect. The output voltage Vcell of the current thermocell, however, is still low (several tens mV) and depends on temperature, which are serious drawbacks for practical use of the device as an independent power supply. Here, we report that usage of phase transition material as electrode qualitatively improve the device performance. We set the critical temperature (Tc) for the phase transition in cobalt Prussian blue analogue (Co-PBA; NaxCo[Fe(CN)6]y) to just above room temperature, by finely adjusting the Fe concentration (y = 0.82). With increase in the cell temperature (Tcell), Vcell of the NaxCo[Fe(CN)6]0.82 (NCF82)/NaxCo[Fe(CN)6]0.9 (NCF90) cell steeply increases from 0 mV to ~120 mV around 320 K. Our observation indicates that the thermocell with use of phase transition is a promising energy harvesting device.

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“…The background subtraction, normalization and analyses of EXAFS spectra were performed using the ATHENA program and EXAFS analyses were performed using the ARTEMIS programs 23 as described elsewhere 18,20 . First, the oscillatory components were extracted using the ATHENA program after background subtraction and normalization of the absorption spectra.…”

Section: Local Structural Analysis By Exafsmentioning

confidence: 99%

Aggregation tendency of guest Fe in NaCo1−xFexO2 (x < 0.1) as investigated by systematic EXAFS analysis

Moriya

Niwa

Nitani

et al. 2020

Sci Rep

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in transition metal (M) compounds, the partial substitution of the host transition metal (M h) to guest one (M g) is effective to improve the functionality. To microscopically comprehend the substitution effect, degree of distribution of M g is crucial. Here, we propose that a systematic EXAFS analysis against the M g concentration can reveal the spatial distribution of M g. We chose NaCo 1−x fe x o 2 as a prototypical M compound and investigated the local intermetal distance around the guest Fe [d fe-M (x)] against Fe concentration (x). d fe-M (x) steeply increased with x, reflecting the larger ionic radius of high-spin Fe 3+. The x-dependence of d fe-M (x) was analyzed by an empirical equation, d Fe−M (x) = sxd Fe−Fe + (1 − sx)d Fe−Co , where d fe-fe and d fe-co are the fe-fe and co-fe distances, respectively. The parameter s represents degree of distribution of Fe; s = 1, > 1, < 1 are for random, attractive, and repulsive distribution, respectively. The obtained s value (= 4.8) indicates aggregation tendency of guest Fe.

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Invariant nature of substituted element in metal-hexacyanoferrate

Cited by 27 publications

References 26 publications

Improved Thermal Cyclability of Tertiary Battery Made of Prussian Blue Analogues

Improved Thermal Cyclability of Tertiary Battery Made of Prussian Blue Analogues

Energy harvesting thermocell with use of phase transition

Aggregation tendency of guest Fe in NaCo1−xFexO2 (x < 0.1) as investigated by systematic EXAFS analysis

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