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The research presents an in-depth analysis of Nafion ionomer thin films, focusing on the structural and electrochemical characteristics crucial for optimizing fuel cell performance. Utilizing advanced characterization techniques, namely Grazing Incidence Wide-Angle X-ray Scattering (GIWAXS) and Grazing Incidence Small-Angle X-ray Scattering (GISAXS), we have explored the intricate morphology and molecular arrangement within Nafion films of varying thicknesses. Our research underscores the pivotal role of annealing in tailoring the microstructure of these films. Through controlled annealing processes, we observed significant modifications in the interchain packing and crystallinity of the Nafion films, which in turn, markedly influenced their electrochemical interface properties. The GIWAXS analysis provided valuable insights into the crystalline domains and their orientation, revealing a correlation between the degree of crystallinity and the film thickness. GISAXS, on the other hand, offered a detailed view of the larger-scale structures, including the distribution and size of ionic domains within the film. The combination of these techniques has enabled a comprehensive understanding of how structural nuances at both the micro and meso-scale contribute to the electrochemical behavior of Nafion films. This study not only enhances the fundamental understanding of ionomer thin films but also paves the way for the development of more efficient and robust membrane materials for fuel cell applications, highlighting the importance of structural control in achieving desired electrochemical properties.
Prof. Gao, who completed his studies at Kyoto University, contributes to the field of electrochemistry and material science with a focus on electrochemical interfaces and high-energy X-ray applications. Prof. Gao's research is centered around electrochemical interfaces, a crucial element in energy storage and conversion technologies like batteries and fuel cells. He is particularly skilled in advanced characterization techniques, including Grazing Incidence Wide-Angle X-ray Scattering (GIWAXS), Grazing Incidence Small-Angle X-ray Scattering (GISAXS), and X-ray Absorption Fine Structure (XAFS), making him a leading expert in structural analysis of materials at the molecular level. Prof. Gao's dedication transcends academic research, as he is deeply committed to the development and structural analysis of clean energy materials. Recognizing the urgent need for sustainable energy solutions, his work focuses on creating environmentally friendly materials that are both efficient and effective. His contributions have significantly advanced both academic and practical applications in clean energy, earning him international recognition and respect. Prof. Gao's journey from Kyoto University to becoming a key contributor to sustainable energy solutions exemplifies his commitment, expertise, and significant impact in the realms of material science and electrochemistry.