高温质子交换膜水电解用Nafion/BN复合膜的制备与性能研究

Preparation and performance investigation of Nafion/BN composite membrane for high temperature proton exchange membrane water electrolysis

在研究高温质子交换膜水电解系统时,膜脱水引致质子传导率降低的情况是造成电解性能较低的主要问题。针对该问题,引入了氮化硼(BN)作为一种无机吸湿改性剂。通过采用掺杂浇铸技术,成功制备了Nafion/BN复合膜。氮化硼的卓越吸湿能力,以及其表面碱性基团与Nafion分子链上磺酸基团之间的酸碱相互作用,共同形成了一个密集的氢键网络,从而推进质子的传递。扫描电子显微镜(SEM)和X射线能量散射光谱(EDS)的分析结果验证了氮化硼在复合膜中的均匀分布。吸水率的测试结果显示,BN的引入显著增强了复合膜的水吸附能力。通过质子电导率的测试,证实BN的掺杂显著提升了复合膜的质子电导率。在130℃的高温条件下,采用Nafion/BN复合膜构建的水电解装置表现出了卓越的电解效能,尤其是在2.0 V电压下,电流密度达到2.04 A/cm^(2),表明Nafion/BN复合膜在高温质子交换膜水电解领域内具有一定的发展潜力。

To circumvent the deleterious effect of water depletion and enhance the protonic conduction at elevated temperatures in proton exchange membrane water electrolysis,Nafion/BN composite membranes have been ingeniously contrived,utilizing boron nitride(BN)as a novel hygroscopic modifier.The inherent alkaline moieties presented on BN’s surface engage in a synergetic acid-base interplay with the sulfonic acid groups of the Nafion matrix,establishing a robust hydrogen-bonded lattice that significantly expedites proton translocation.The scanning electron microscopy(SEM)and X-ray energy dispersive spectroscopy(EDS)assessments affirm the homogeneity of BN’s dispersion within the membrane.Water uptake assays articulate a substantial augmentation in the membrane’s hygroscopicity attributable to BN’s incorporation.Successive evaluations of proton conductivity corroborate BN’s efficacy in elevating the membrane’s ionic conduction capabilities.In practical application,the Nafion/BN composite membrane manifested superior performance in water electrolysis at 130℃,achieving a notable current density of 2.04 A/cm^(2) at a potential of 2.0 V.The findings portend a promising trajectory for Nafion/BN composite membranes within the realm of high-temperature proton exchange membrane water electrolysis.