A polymeric hydrogen carrier with reversible H₂ storage capability was developed by incorporating a quinoxaline/tetrahydroquinoxaline redox couple into an aliphatic polymer chain. The quinoxaline unit was designed with a view to significantly increase the mass H₂ storage density in the polymer up to 2.6 wt % calculated for the repeating unit, compared with the previously reported density of 0.9 wt % for poly(vinylfluorenone). An iridium complex-catalyzed hydrogenation of quinoxaline was characterized by its reversibility according to temperature, giving rise to tetrahydroquinoxaline under mild conditions (60 °C and 1 atm of H₂), which released H₂ gas by simply warming in common organic solvents. Its polymer extension allowed quinoxaline to be a polymeric hydrogen carrier in a solid state, which was characterized by the inherent advantages of safety, moldability, and handling easiness. Poly(vinylquinoxaline) was prepared by the radical polymerization of vinylquinoxaline. Poly(vinylquinoxaline) swollen with γ-butyrolactone became a gel-like solid, which quantitatively released and then fixed H₂ gas under mild conditions.

中文翻译：

---

聚（乙烯基喹喔啉）在温和条件下的可逆氢固定和释放

通过将喹喔啉/四氢喹喔啉氧化还原对引入脂族聚合物链中，开发了具有可逆H ₂储存能力的聚合物氢载体。设计喹喔啉单元的目的是与先前报道的聚（乙烯基芴酮）的密度为0.9重量％相比，显着提高聚合物中H ₂的质量存储密度至重复单元计算的2.6重量％。铱配合物催化的喹喔啉氢化反应的特征在于其可逆温度，在温和条件下（60°C和1 atm H ₂）产生四氢喹喔啉，并释放出H ₂只需在常见的有机溶剂中加热即可产生气体。它的聚合物延伸使喹喔啉成为固态的聚合物氢载体，其特点是安全性，可模塑性和操作简便性等固有优势。通过乙烯基喹喔啉的自由基聚合制备聚（乙烯基喹喔啉）。用γ-丁内酯溶胀的聚（乙烯基喹喔啉）变成凝胶状固体，在温和条件下定量释放并固定H ₂气体。