Energy harvesting thermocell with use of phase transition
Energy harvesting thermocell with use of phase transition
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DOI：
10.1038/s41598-020-58695-z
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发表时间：
2020-02-04
影响因子：
4.6
通讯作者：
Moritomo, Yutaka
中科院分区：
文献类型：
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作者：
Shibata, Takayuki;Iwaizumi, Hiroki;Moritomo, Yutaka
由具有不同氧化还原电位（V）温度系数（α =dV/dT）的阴极和阳极材料组成的热电池可以通过所谓的热充电效应将环境热能转化为电能。然而，当前热电池的输出电压V-cell仍然很低（几十mV），并且取决于温度，这对于实际使用该装置作为独立电源是严重的缺点。在这里，我们报告说，使用相变材料作为电极定性地提高了器件的性能。我们通过精细调节Fe浓度（y=0.82），将钴普鲁士蓝类似物（Co-PBA; NaxCo[Fe（CN）（6）]（y））中相变的临界温度（T-c）设置为略高于室温。随着电池温度（T电池）的升高，NaxCo[Fe（CN）（6）]（0.82）（NCF 82）/NaxCo[Fe（CN）（6）]（0.9）（NCF 90）电池的V电池在320 K附近从0 mV急剧增加到接近120 mV。我们的观察表明，利用相变的热电池是一种很有前途的能量收集装置。
A thermocell that consists of cathode and anode materials with different temperature coefficients (alpha=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 V-cell 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 (T-c) 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 (T-cell), V-cell of the NaxCo[Fe(CN)(6)](0.82) (NCF82)/NaxCo[Fe(CN)(6)](0.9) (NCF90) cell steeply increases from 0mV to similar to 120mV around 320K. Our observation indicates that the thermocell with use of phase transition is a promising energy harvesting device.