Publication date: 10th April 2024
For decades, much effort has been devoted to developing proton conductors applicable to electrochemical devices at intermediate temperatures. However, promising materials that possess sufficient conductivity have not been realized yet. This study demonstrates the development of novel proton conductors that are operative at intermediate temperatures, especially 300–400 °C, through the simple ion-exchange method. The Li+/H+ ion-exchange process was conducted for Li(14−2x)/4Zn(1+x)/4GeO4 (lithium super ionic conductors, LISICONs) in non-aqueous solutions. The chemical formula of the resultant sample was determined as Li3.13H0.37Zn0.25GeO4. The electrical conductivity of this material was evaluated to be 87.0 mS cm−1, 39.0 mS cm−1, and 5.5 mS cm−1 at 400 °C, 300 °C, and 200 °C, respectively, in 10% H2O–90% N2. Furthermore, the main charge carrier in this electrolyte was identified as a proton from the H/D isotopic exchange study. These findings open up the possibility of realizing new electrochemical devices that are operative at 200–400 °C.
This paper is based on results obtained from the projects commissioned by the New Energy and Industrial Technology Development Organization (NEDO), JSPS KAKENHI Grant Number JP20H02841 (Grant-in-Aid for Scientific Research (B)), and JST-Mirai Program Grant Number JPMJMI22E7, Japan.
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