Rodríguez Lagar Pablo, Concheso Alejandro, Barreda Daniel, González Zoraida, Montes-Morán Miguel A, Menéndez J Angel, Blanco Clara, Santamaría Ricardo, Rocha Victoria G
Instituto de Ciencia y Tecnología del Carbono, INCAR-CSIC, C/Francisco Pintado Fe, 26, Oviedo, 33011, Spain.
Adv Sci (Weinh). 2025 Jun;12(22):e2417641. doi: 10.1002/advs.202417641. Epub 2025 May 15.
Redox flow batteries are attractive systems for large-scale energy storage due to their capability to uncouple energy and power but still need to make several improvements to reach full commercial scale. The need to search for better components, including electrode materials that allow the internal flow of electrolytes and have optimal electrochemical performance is a hot topic in the development of this kind of battery. The use of direct ink writing technology to engineer complex electrode materials both in the architecture and chemical composition opens a new field of research to optimize electrode performance. In this study, several formulations are prepared using graphite, multiwall carbon nanotubes, and two different Polyacrylonitrile (PAN)-based short carbon fibers. Furthermore, a graphitizable binder is added to the formulation to help consolidate the printed object into a highly conductive (3000-8000 Sm) and mechanically resistant carbon electrode after a moderate heat treatment (800 °C). The 3D electrodes are successfully tested in an all vanadium redox flow cell showing a competitive performance when compared to benchmark electrodes (graphite felts).
氧化还原液流电池因其能够将能量和功率解耦，是大规模储能的有吸引力的系统，但仍需要进行若干改进才能达到完全商业化规模。寻找更好的组件的需求，包括允许电解质内部流动并具有最佳电化学性能的电极材料，是这类电池开发中的一个热门话题。使用直接墨水书写技术在结构和化学成分上设计复杂的电极材料，为优化电极性能开辟了一个新的研究领域。在本研究中，使用石墨、多壁碳纳米管和两种不同的聚丙烯腈（PAN）基短碳纤维制备了几种配方。此外，在配方中添加了一种可石墨化的粘合剂，以帮助在适度热处理（800°C）后将打印物体固结成为高导电性（3000-8000 S/m）且机械性能良好的碳电极。3D电极在全钒氧化还原液流电池中成功进行了测试，与基准电极（石墨毡）相比显示出具有竞争力的性能。
