Niobium Oxyhydroxide‐Polyoxometalate Composite as an Efficient Proton‐Conducting Solid Electrolyte,ChemElectroChem

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Niobium Oxyhydroxide‐Polyoxometalate Composite as an Efficient Proton‐Conducting Solid Electrolyte
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-03-09 , DOI: 10.1002/celc.201800055
Yi-Di Wang ₁ , Jia-Xuan Wang ₁ , Mei-Jie Wei ₁ , Bai-Ling Liu ₁ , Hong-Ying Zang ₁ , Hua-Qiao Tan ₁ , Yong-Hui Wang ₁ , Yang-Guang Li ₁

Affiliation

It is still challenging to develop new and low‐cost proton‐conductive solid electrolytes using a simple synthetic procedure. Herein, a new proton‐conducting material was synthesized for the first time through a sol‐gel method by merging niobium oxyhydroxide with polyoxometalate (POM). NbO₂(OH)‐PW₁₂ exhibited higher proton conductivity than that of niobium oxyhydroxide with varying humidity. Additionally, the molar ratio of Nb:{PW₁₂} played a vital role in the proton conductivity and, when the molar ratio of Nb:{PW₁₂} was 67 : 1, the material showed the maximum proton conductivity with a value of 7.25 mS cm⁻¹ at 77 °C under 97 % RH, which was 10000 times higher than that of niobium oxyhydroxide. To the best of our knowledge, this is the first niobium‐oxyhydroxide‐based intrinsic proton conductor with such high proton conductivity below 100 °C. The kinetics study suggested that the proton conduction mechanism of NbO₂(OH)‐PW₁₂ might follow the Grotthuss mechanism.

中文翻译：

羟基氧化铌-多金属氧酸铌复合材料作为高效的质子传导固体电解质

使用简单的合成方法来开发新型且低成本的质子传导性固体电解质仍然具有挑战性。在此，通过将羟基氧化铌与多金属氧酸盐（POM）合并，通过溶胶-凝胶法首次合成了一种新的质子传导材料。NbO ₂（OH）-PW _12的质子传导性高于不同湿度下的羟基氧化铌。此外，Nb：{PW ₁₂ }的摩尔比在质子传导率中起着至关重要的作用，当Nb：{PW ₁₂ }的摩尔比为67：1时，该材料显示出最大的质子传导率，值为7.25 mS cm ^-1在77°C和97％相对湿度下，比羟基氧化铌高10000倍。据我们所知，这是第一款在100°C以下具有如此高质子传导率的基于羟基氧化铌的质子导体。动力学研究表明，NbO ₂（OH）-PW ₁₂的质子传导机制可能遵循格罗索斯机制。

更新日期：2018-03-09

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