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Monolayer Hexagonal Boron Nitride Nanosheets as Proton-Conductive Gas Barriers for Polymer Electrolyte Membrane Water Electrolysis
ACS Applied Nano Materials ( IF 5.9 ) Pub Date : 2021-09-15 , DOI: 10.1021/acsanm.1c01691
Taeeun Kim 1, 2 , Youngho Sihn 1 , In-Ho Yoon 1 , Sang Jun Yoon 3 , Kwangse Lee 4 , Jae Hwan Yang 2, 5 , Soonyong So 3 , Chan Woo Park 1
Affiliation  

In a proton exchange membrane (PEM) water electrolyzer, the poor gas barrier property of conventional perfluorosulfonic acid (PFSA) membranes results in membrane degradation and safety-related explosion issues. In this report, we investigate the potential of monolayer hexagonal boron nitride (hBN) as an effective hydrogen gas barrier for PEMs in a water electrolyzer. An hBN/Nafion composite membrane is prepared by transferring large-area monolayer hBN (∼25 cm2), which is prepared using chemical vapor deposition, onto Nafion 117. This one-atom-thick monolayer hBN, which is known as an impermeable material to most molecules except protons, significantly enhances the hydrogen barrier property of Nafion 117, even at high temperatures, and increases the mechanical stability of the membrane. Although a trade-off between proton conductivity and hydrogen barrier properties is observed, the water electrolysis efficiency of the cell containing the composite membrane is improved by increasing the operating temperature while minimizing the decrease in proton conductivity. By employing monolayer hBN, hydrogen permeability is significantly reduced by approximately 40%, and the corresponding electrolysis efficiency decreases by 19% compared to that of pristine Nafion. Furthermore, the enhanced gas barrier property of the composite shows slightly higher long-term (100 h) stability than that of Nafion 117.

中文翻译:

单层六方氮化硼纳米片作为聚合物电解质膜水电解的质子传导气体屏障

在质子交换膜 (PEM) 水电解槽中,传统全氟磺酸 (PFSA) 膜的气体阻隔性差导致膜降解和安全相关的爆炸问题。在本报告中,我们研究了单层六方氮化硼 (hBN) 作为水电解槽中 PEM 的有效氢气屏障的潜力。hBN/Nafion 复合膜是通过转移大面积单层 hBN (~25 cm 2),它是使用化学气相沉积制备的,在 Nafion 117 上。这种一个原子厚的单层 hBN,被称为除质子外的大多数分子的不可渗透材料,即使在高温下也能显着提高 Nafion 117 的氢阻隔性能,并增加膜的机械稳定性。尽管观察到质子传导性和氢阻隔性能之间的权衡,但是通过提高操作温度同时使质子传导性的降低最小化,包含复合膜的电池的水电解效率得到改善。通过采用单层 hBN,与原始 Nafion 相比,氢渗透率显着降低了约 40%,相应的电解效率降低了 19%。此外,
更新日期:2021-09-24
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