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首页> 外文期刊>Advanced Functional Materials >Careful Choices in Low Temperature Ceramic Processing and Slow Hydration Kinetics Can Affect Proton Conduction in Ceria
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Careful Choices in Low Temperature Ceramic Processing and Slow Hydration Kinetics Can Affect Proton Conduction in Ceria

机译：低温陶瓷加工和缓慢水合动力学的仔细选择可以影响二氧化铈的质子传导

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Low-temperature ceramic proton conductors such as ceria are important for applications ranging from sensors and resistive switches to new devices like implantable solid-oxide glucose fuel cells. Spray pyrolysis offers a promising fabrication route for proton-conducting ceria, with direct liquid-to-solid synthesis and control over crystallinity and grain size. To date, there are conflicting reports on ceria's proton conduction mechanism, particularly whether the interior contributes to proton conduction or transport occurs exclusively along a surface water layer. In this work, proton conductivity is observed in sprayed ceria thin films at 125 degrees C and below. Post-annealed films exhibit higher conductivity than as-deposited films of 3.3 x 10(-5) S cm(-1) at 25 degrees C, which is comparable to previous reports and ascribed to the increase in crystallinity and grain size by post-annealing. This indicates that the interior of ceria in fact contributes to proton conduction. Remarkably slow hydration kinetics of ceria are observed, with time-dependent conductivity equilibrating to 9.53 x 10(-6) S cm(-1) after up to 76 h. This implies kinetics may have suppressed proton conduction in previous studies, explaining the strong fluctuations in reports to date. Slow protonation kinetics must be considered when designing functional ceria ceramics, for example, in electrochemical bio-energy conversion, sensing or neuromorphic computing.
机译：低温陶瓷质子导体如Ceria对于从传感器和电阻开关到植入固体氧化物葡萄糖燃料电池等新装置的应用非常重要。喷雾热解提供用于质子导电的有前途的制造途径，具有直接液体 - 固体合成和控制结晶度和晶粒尺寸。迄今为止，关于Ceria的质子传导机制存在矛盾的报告，特别是内部是否有助于质子传导或传输仅沿着地表水层发生。在这项工作中，在125℃和下方的喷涂的Ceria薄膜中观察到质子电导率。退火后的薄膜在25摄氏度下表现出比3.3×10（-5）厘米（-1）的沉积薄膜更高的电导率，其与之前的报告相当，并且通过后的结晶度和晶粒尺寸的增加退火。这表明Ceria的内部实际上有助于质子传导。观察到多个慢的水合动力学，时间依赖性电导率在高达76小时后平衡至9.53×10（-6）厘米（-1）。这意味着动力学可能会在先前的研究中抑制质子传导，解释迄今为止的报告中的强烈波动。在设计功能性Ceria陶瓷时，必须考虑慢质子化动力学，例如，在电化学生物能量转化，感测或神经形态计算中。

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