碳化钛作为Nafion基质中的可持续填充剂稳定的二氧化铈改善了质子交换膜燃料电池的机械完整性，电化学耐久性和氢不渗透性：填充剂含量的影响。,ACS Applied Materials & Interfaces

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碳化钛作为Nafion基质中的可持续填充剂稳定的二氧化铈改善了质子交换膜燃料电池的机械完整性，电化学耐久性和氢不渗透性：填充剂含量的影响。
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-01-22 , DOI: 10.1021/acsami.9b18059
Mohanraj Vinothkannan ₁ , S Ramakrishnan ₁ , Ae Rhan Kim ₂ , Hong-Ki Lee ₃ , Dong Jin Yoo _{1,

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Affiliation

当修饰质子交换膜燃料电池（PEMFC）的Nafion基体时，氧化铈锚定的碳化钛（CeO2-TiC）被实现为潜在的无机填料。采用水热法合成高结晶度的CeO2-TiC作为填料，以减轻质子交换膜（PEM）的问题。通过采用溶液浇铸法，将重量比为0.5、1、1.5或2％的CeO2-TiC掺入Nafion基质中以形成杂化物。由于存在TiC，增强强度可增强PEM的拉伸强度，而CeO2的添加可通过清除自由基来提高PEM的耐久性。PEM的微观结构，热机械，物理化学和电化学特性，包括接触角，吸水率，吸水率和质子传导率，被广泛研究。与原始Nafion相比，CeO2-TiC在Nafion基质中的随机分散改善了热稳定性，拉伸强度和吸水率，同时保持了质子传导性。结果，与原始的Nafion相比，优化的Nafion / CeO2-TiC（1 wt％）在不改变PEMFC性能的情况下，在60°C和100％的相对湿度下运行该设备。此外，Nafion / CeO2-TiC（1 wt％）在相同条件下运行200 h时仅经历了0.6 mV h-1的降解。与Nafion / CeO2-TiC（1 wt％）相比，原始的Nafion和Nafion-212表现出加速的降解和相当的降解（原始的Nafion为1.3 mV h-1； Nafion-212的为0.4 mV h-1）。耐久性测试后，检查了PEMFC的功率输出，氢渗透性和样品的形态；结果表明，Nafion / CeO2-TiC（1 wt％）非常稳定。由于已经报道了各种Nafion混合动力汽车为高度耐用的PEM，因此这项研究有望为扩展其应用开辟新的视野，尤其是在可持续PEMFC技术中。

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Ceria Stabilized by Titanium Carbide as a Sustainable Filler in the Nafion Matrix Improves the Mechanical Integrity, Electrochemical Durability, and Hydrogen Impermeability of Proton-Exchange Membrane Fuel Cells: Effects of the Filler Content.

Cerium oxide-anchored titanium carbide (CeO2-TiC) is realized as a potential inorganic filler when modifying the Nafion matrix of a proton-exchange membrane fuel cell (PEMFC). A hydrothermal strategy was employed to synthesize CeO2-TiC of high crystallinity as a filler to mitigate the problematic properties of a proton-exchange membrane (PEM). CeO2-TiC with a weight ratio of 0.5, 1, 1.5, or 2% was incorporated into a Nafion matrix to form a hybrid by adopting a solution-casting procedure. Reinforcement owing to the presence of TiC provides increased tensile strength to PEM, and the addition of CeO2 improves the durability of PEM by scavenging free radicals. The microstructural, thermomechanical, physiochemical, and electrochemical properties of PEM, including contact angle, water sorption, water uptake, and proton conductivity, were extensively studied. Random dispersion of CeO2-TiC in the Nafion matrix improves the thermal stability, tensile strength, and water uptake while retaining proton conductivity, as compared with those of pristine Nafion. As a result, optimized Nafion/CeO2-TiC (1 wt %) achieved undiminished PEMFC performance compared to that of pristine Nafion while operating the device at 60 °C and 100% relative humidity. In addition, Nafion/CeO2-TiC (1 wt %) experienced the degradation of merely 0.6 mV h-1 during 200 h operation under identical conditions. Compared to that of Nafion/CeO2-TiC (1 wt %), pristine Nafion and Nafion-212 displayed accelerated and comparable degradation (for pristine Nafion, 1.3 mV h-1; for Nafion-212, 0.4 mV h-1). PEMFC power output, hydrogen permeability, and morphology of samples were examined after the durability test; the results indicate that Nafion/CeO2-TiC (1 wt %) is extremely stable. Since various Nafion hybrids have been reported as highly durable PEMs, this study is expected to open up new perspectives to expanding their applications, especially in sustainable PEMFC technology.

更新日期：2020-01-23

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