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Self‐Healing Proton‐Exchange Membranes Composed of Nafion–Poly(vinyl alcohol) Complexes for Durable Direct Methanol Fuel Cells
Advanced Materials ( IF 27.4 ) Pub Date : 2018-04-30 , DOI: 10.1002/adma.201707146 Yixuan Li 1 , Liang Liang 2 , Changpeng Liu 2 , Yang Li 1 , Wei Xing 2 , Junqi Sun 1
Advanced Materials ( IF 27.4 ) Pub Date : 2018-04-30 , DOI: 10.1002/adma.201707146 Yixuan Li 1 , Liang Liang 2 , Changpeng Liu 2 , Yang Li 1 , Wei Xing 2 , Junqi Sun 1
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Proton‐exchange membranes (PEMs) that can heal mechanical damage to restore original functions are important for the fabrication of durable and reliable direct methanol fuel cells (DMFCs). The fabrication of healable PEMs that exhibit satisfactory mechanical stability, enhanced proton conductivity, and suppressed methanol permeability via hydrogen‐bonding complexation between Nafion and poly(vinyl alcohol) (PVA) followed by postmodification with 4‐carboxybenzaldehyde (CBA) molecules is presented. Compared with pure Nafion, the CBA/Nafion–PVA membranes exhibit enhanced mechanical properties with an ultimate tensile strength of ≈20.3 MPa and strain of ≈380%. The CBA/Nafion–PVA membrane shows a proton conductivity of 0.11 S cm−1 at 80 °C, which is 1.2‐fold higher than that of a Nafion membrane. The incorporated PVA gives the CBA/Nafion–PVA membranes excellent proton conductivity and methanol resistance. The resulting CBA/Nafion–PVA membranes are capable of healing mechanical damage of several tens of micrometers in size and restoring their original proton conductivity and methanol resistance under the working conditions of DMFCs. The healing property originates from the reversibility of hydrogen‐bonding interactions between Nafion and CBA‐modified PVA and the high chain mobility of Nafion and CBA‐modified PVA.
中文翻译：
由Nafion-聚乙烯醇复合物组成的自修复质子交换膜，用于耐用的直接甲醇燃料电池
可以治愈机械损伤以恢复原始功能的质子交换膜（PEM）对于制造耐用且可靠的直接甲醇燃料电池（DMFC）至关重要。介绍了一种可修复的PEM的制造，该材料具有令人满意的机械稳定性，增强的质子传导性以及通过Nafion和聚乙烯醇（PVA）之间的氢键络合并随后用4-羧基苯甲醛（CBA）分子进行后改性的方式抑制了甲醇的渗透性。与纯Nafion相比，CBA / Nafion–PVA膜具有增强的机械性能，极限拉伸强度约为20.3 MPa，应变约为380％。CBA / Nafion–PVA膜的质子传导率为0.11 S cm -1在80°C下，比Nafion膜高1.2倍。结合使用的PVA使CBA / Nafion–PVA膜具有出色的质子传导性和耐甲醇性。在DMFC的工作条件下，所得的CBA / Nafion-PVA膜能够修复数十微米大小的机械损伤，并恢复其原始的质子传导性和耐甲醇性。愈合性能源自Nafion和CBA改性的PVA之间氢键相互作用的可逆性以及Nafion和CBA改性的PVA的高链迁移性。
更新日期：2018-04-30
中文翻译：
由Nafion-聚乙烯醇复合物组成的自修复质子交换膜，用于耐用的直接甲醇燃料电池
可以治愈机械损伤以恢复原始功能的质子交换膜（PEM）对于制造耐用且可靠的直接甲醇燃料电池（DMFC）至关重要。介绍了一种可修复的PEM的制造，该材料具有令人满意的机械稳定性，增强的质子传导性以及通过Nafion和聚乙烯醇（PVA）之间的氢键络合并随后用4-羧基苯甲醛（CBA）分子进行后改性的方式抑制了甲醇的渗透性。与纯Nafion相比，CBA / Nafion–PVA膜具有增强的机械性能，极限拉伸强度约为20.3 MPa，应变约为380％。CBA / Nafion–PVA膜的质子传导率为0.11 S cm -1在80°C下，比Nafion膜高1.2倍。结合使用的PVA使CBA / Nafion–PVA膜具有出色的质子传导性和耐甲醇性。在DMFC的工作条件下，所得的CBA / Nafion-PVA膜能够修复数十微米大小的机械损伤，并恢复其原始的质子传导性和耐甲醇性。愈合性能源自Nafion和CBA改性的PVA之间氢键相互作用的可逆性以及Nafion和CBA改性的PVA的高链迁移性。
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